Data Configuration Manual
GSM9001800 BSS Network Planning Parameters ReferenceV3.2
Table of Contents
Table of Contents
Chapter 1 Foreword.............................................................................................................. 1-1
1.1 Types of Radio Parameter Adjustment ........................................................................ 1-2
1.2 Prerequisites for Radio Parameter Adjustment............................................................. 1-2
1.3 Points for Attention in Radio Parameter Adjustment ..................................................... 1-2
Chapter 2 Data Configuration ............................................................................................... 2-1
2.1 Local Office............................................................................................................... 2-1
2.1.1 [BSC cell table] ................................................................................................ 2-1
2.1.2 [Frequency hopping data table] ......................................................................... 2-3
2.1.3 [Radio channel configuration table] ................................................................... 2-4
2.1.4 [Flow control parameter table] ........................................................................... 2-6
2.2 Site........................................................................................................................... 2-6
2.2.1 [Carrier Configuration Table] ............................................................................. 2-6
2.2.2 [Antenna and Feeder Configuration Table] ........................................................ 2-7
2.3 Cells ......................................................................................................................... 2-8
2.3.1 [System information table] ................................................................................ 2-8
2.3.2 [Cell configuration data table] .......................................................................... 2-24
2.3.3 [Cell Allocation Table]..................................................................................... 2-27
2.3.4 [BA1 Table] ................................................................................................... 2-28
2.3.5 [BA2(SACCH) table] ....................................................................................... 2-28
2.3.6 [Cell Attribute Table]....................................................................................... 2-29
2.3.7 [Cell Alarm Threshold Table]........................................................................... 2-37
2.3.8 [Cell call control table] .................................................................................... 2-38
2.3.9 [Cell Call Control Parameter Table] ................................................................. 2-42
2.3.10 [Cell module information table] ...................................................................... 2-44
2.4 Handover ................................................................................................................ 2-44
2.4.1 [Handover control data table] .......................................................................... 2-45
2.4.2 [Cell Description Table] .................................................................................. 2-50
2.4.3 [External Cell Description Table] ..................................................................... 2-53
2.4.4 [Adjacent Cell Relation Table] ......................................................................... 2-53
2.4.5 [Filter data table] ............................................................................................ 2-54
2.4.6 [Penalty Table]............................................................................................... 2-55
2.4.7 [Emergency Handover Table] ......................................................................... 2-57
2.4.8 [Load Handover Table] ................................................................................... 2-61
2.4.9 [Normal Handover Data Table]........................................................................ 2-62
2.4.10 [MS Fast Moving HO Data Table] .................................................................. 2-64
2.4.11 [Intra-cell Handover Data Table] .................................................................... 2-65
2.4.12 [GSM0508 Handover Table] ......................................................................... 2-66
2.4.13 [HW-IUO Handover Table] ............................................................................ 2-66
2.5 Power control .......................................................................................................... 2-70
2.5.1 [Power Control Selection Table] ...................................................................... 2-70
2.5.2 [Ordinary Cell PC Table] ................................................................................. 2-70
2.5.3 [BTS Power Control Data Table] ..................................................................... 2-74
2.5.4 [MS power control data table] ......................................................................... 2-77
2.5.5 [HW II power control data table] ...................................................................... 2-80
2.6 Channels ................................................................................................................ 2-87
2.6.1 [Radio channel management control table] ...................................................... 2-87
2.6.2 [HW II Channel Allocation table] ...................................................................... 2-91
Chapter 3 RNP Parameters Form ....................................................................................... 3-95
Chapter 4 BCCH participate in FH Data Config..................................................................4-103
4.1 Overview................................................................................................................4-103
4.2 Data configuration...................................................................................................4-103
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Table of Contents
Chapter 5 Contrast table of RNP Parameters between BSC04.080520 and BSC04.1120 ...5-104
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Chapter 1 Foreword
Chapter 1 Foreword
GSM9001800 BSS Network Planning Parameters ReferenceV3.2 is for Huawei’ s GSM BSC
04.1120A version. The difference with the former version is referred to Chapter5.
The 900/1800MHz digital cellular mobile communication system (GSM) is an integrated
system that integrates network technology, digital SPC switching technology, various
transmission technologies and radio technologies. The GSM system can be divided into
three parts in physical structure of the network: the network subsystem (NSS), the base
station subsystem (BSS), and the MS (MS). In the signaling structure, the GSM system
–consists of MAP interface, A interface (interface between MSC and BSC), Abis
interface (interface between BSC and BTS) and Um interface (interface between BTS
and MS). All these entities and interfaces have plenty of configuration parameters and
performance parameters. Some of them have already been determined during the
equipment development stage. While most are determined by the network operators as
according to the actual requirements and actual running. The settings and adjustments
of those parameters have considerable impacts on the operation of the whole GSM
network. Therefore, network optimization is the process of settings and adjustments of
various parameters.
The GSM network has parameters related to radio devices and radio interfaces that can
impact the network performance. The radio parameters in the GSM net work refer to
those related to radio devices and radio resources. These parameters have vital impact
on the coverage, distribution of signaling flow and network performance. Thus,
adjustment of radio parameters is an important part of the optimization.
The GSM radio parameters can be divided into two types as according to the service
targets of the radio parameters, i.e., engineering parameters and resource parameters.
The engineering parameters are related to engineering design, installation and
commissioning such as antenna height, antenna direction, antenna gain, antenna
downtilt and cable attenuation. These parameters must be determined during network
design. These parameters can hardly be changed during network operation.
The
resources parameters refer to those related to the configuration and usage of radio
resources. They are normally transmitted on Um interface to keep the consistency
between the base station and MS. Most resources parameters can be dynamically
adjusted through certain man machine interfaces (MMI) during network operation. The
radio parameters involved in this document are mainly radio resources parameters
(unless otherwise specify, the parameters described here are radio resources
parameters).
When an operator is to construct a mobile communications network, he must first make
engineering design according to geographic environments, service forecast, radio
channel features, and etc. The design should include network structure design, base
station location selection and frequency planning. During the network operation, the
operator may need to adjust the network configurations and parameters so as to
improve network performance. This is an important part of the whole network
optimization process.
Radio parameter optimization is a process to improve the communication quality, the
network performance, and the equipment utilization rate by adjusting the partial or
global radio parameters as according to the actual radio channel features, traffic
features, and signaling flow bearing. The basic principle of radio parameter adjustment
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Chapter 1 Foreword
is to make full use of existing radio resources, balance the global traffic and signaling
flow through load-sharing so as to achieve a better network performance.
1.1 Types of Radio Parameter Adjustment
There are two types of radio parameter adjustment. The first type of Radio Parameter
Adjustment is to solve static problems as according to the actual average traffic and
signaling flow The other type of Radio Parameter Adjustment is to solve problems in
traffic overloading and channel congestion.
For the first type of adjustment, the operator has to test the actual running of the
network periodically. On the basis of the test results adjust the global or partial network
parameters and configurations. While for the second type of adjustment, the operator
needs to adjust some radio parameters – as according to the real-time driver test and
the traffic statistics data. This document describes the meaning of the parameters and
analyses the impact of parameter adjustment on the whole network performance.
1.2 Prerequisites for Radio Parameter Adjustment
The network operator must know the meaning, adjustment method and the result of the
adjustments of each radio network parameter. The network operator should be very
experienced in the radio network parameters. This is a necessary condition to adjust
radio network parameters effectively. Meanwhile, the adjustment of radio parameters
depends on many testing data during network operation. Generally, these data can be
obtained in two ways. Firstly, the statistical data can be obtained from the Operation
Maintenance Center (OMC) such as the load of CCCH, RACH channels. Secondly,
other data such as the coverage, and the MS speech quality, should be obtained from
actual measurements and tests. Therefore, frequent and long-term measurements of
various network features are necessary for effective radio parameter adjustment.
1.3 Points for Attention in Radio Parameter Adjustment
In the GSM system, many radio network parameters are set on the basis of cells and
local areas (LA). As inter-region parameters are often strongly interrelated, during
adjustment of those parameters, consideration must be given to the impact on other
areas, especially on adjacent cells. Otherwise, parameter adjustment will bring about
negative consequences.
Besides, when a problem occurs in a region, make sure whether it is caused by
equipment faults (including connection failure). Only when it is confirmed that network
problems are caused by service causes then radio parameter adjustment be performed.
The radio parameter adjustments recommended in this document assume that no
device problems exist.
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Chapter 2 Data Configuration
2.1 Local Office
2.1.1 [BSC cell table]
Cell system type
Description:
M900/M1800 BSC supports both the independent and hybrid
network structures of both 900M and 1800M. The frequency
band can be set to either "GSM900" or "GSM1800" as according
to the actual situation.
Value range:
GSM900, GSM1800
Unit
-
Default:
GSM900
Sub cell type
Description:
Use to determine a cell class in a hierarchical structure so as to
differentiate macro-cell, micro-cell, and to realize load-sharing
and inter-layer handover.
Value range:
Normal, upper layer, and lower layer.
Unit
-
Default:
"normal"
cell class
Description:
Use to determine a cell class in a hierarchical structure so as to
differentiate macro-cell, micro-cell, and to realize load-sharing
and inter-layer handover.
Value range:
Medium layer, upper layer, and lower layer.
Unit
-
Default:
"upper layer"
BCC
Description:
BCC is Base Station Color Code. It is used to distinguish
among adjacent cells with the same BCCH frequency. In cells
that use frequency hopping, the TSC in the frequency hopping
data table must be configured to be consistent with the BCC in
the cell.
Regarding the protection against co-channel interference, the MS
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reports the BCC value so that the BSC can distinguish among
different cells transmitting on the same frequency. For this
purpose the BCC must be allocated as wisely as possible. If
frequency reuse clusters are used then it is recommended that all
BTSs in a given cluster use the same BCC. In this way the reuse
distance of a certain BCC can be maximised according to the
frequency reuse distance.
Note that only 8 different values (BCC: 0 to 7) are used for the
purpose of recognising co-channel interference.
Value range:
0~7
Unit
-
Default:
-
NCC
Description:
The NCC is Network Color Code. It is used to discriminate
networks in different areas. It is a uniform code over the whole
country.
The colour code NCC is then used to discriminate cells that use
the same frequency. Though mainly intended for the purpose of
differentiating PLMNs, it also serves to distinguish cells within
one PLMN that use the same frequency provided they have been
assigned different NCC.
What is stated here should be considered as general guidelines.
Of course any type of NCC assignment must be decided by
agreements between operators and countries.
Value range:
0~7
Unit
-
Default:
-
Note:
BCC and NCC form the BSIC, after the dynamic modification of
cell BSIC, TSC in the frequency hopping data table must be
modified accordingly.
CGI
Description:
Cell global identifier. CGI=MCC+MNC+LAC+CI. It should be
noted that the classification of LAC has a significant effect on
increasing signaling load and call completion rate.
Value range:
MCC: 3 digits (Mobile Country Code).
MNC: 2 or 3 digits (Mobile Network Code).
LAC: 1 to 65535 (Location Area Code).
CI: 0 to 65535 (Cell Identity).
Unit
-
Default:
-
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Note:
In Huawei system, LAC and CI should be in hexadecimal format.
CGI is sent to the mobile station (MS) as a part of the system
information message (GSM Rec. 04.08). The combination
MCC-MNC-LAC is also known as the location area identity (LAI).
Support GPRS
Description:
Indicating whether the GPRS function is supported. It should be
noted that the GPRS function needs the support of the base
station.
Value range:
Yes, No
Unit
-
Default:
No
Note:
For base station versions that don't support the GPRS function
and cells that do not provide the GPRS service, the value must
be set to No. Otherwise, some mobiles cannot access to the
network.
2.1.2 [Frequency hopping data table]
Huawei’ s GSM supports RF frame/baseband frame/timeslot hopping. The list is as
follows:
BTS series
RF hopping
Baseband
hopping
Timeslot
hopping
Frame
hopping
BCCH participating in baseband
hopping
BTS2X
Y
N
N
Y
N
BTS3X
Y
Y
Y
Y
BTS3X 03.0529 and
BSC08.0520B or above
FH index No.
Description:
Internal index number providing an association between the radio
channel configuration table and the frequency hopping data
table.
Value range:
0~65535
Unit
-
Default:
-
MA
Description:
The MA is a set consisting of a maximum of 64 hopping
frequencies. These frequencies must be those in the cell
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allocation table.
Value range:
-
Unit
-
Default:
-
Note:
MA of RF hopping cannot include the frequency of BCCH.
BTS3X of version 03.0529 or above supports BCCH participating
in frequency hopping (baseband and timeslot FH). Thus, except
the timeslot 0 of hopping carrier (when extended BCCH is
configured, its’ corresponding timeslots should be also excluded),
MA in other timeslots can include the BCCH frequency. It should
be noted that only version BSC08.0520B or above supports
BCCH participating in FH.
HSN
Description:
Hopping sequence number, it should be consistent with the 64
types of FH sequence.
Value range:
0~63, (HSN = 0 cyclic hopping sequence, HSN = 1 to 63 pseudo
random ) sequences.
Unit
-
Default:
-
TSC
Description:
Training sequence code. In cells that use FH, TSC must be set to
be the same as the BCC in the cell. Otherwise, the TCH
channels cannot be properly occupied.
Value range:
0~7.
Unit
-
Default:
-
2.1.3 [Radio channel configuration table]
MAIO
Description:
Mobile Allocation Index Offset. In frame that use FH, the same
MAIO is recommended for all channels of a TRX and different
MAIO for different TRX in the same cell. The primary policy is to
guarantee that the MAIO of the same timeslot of different TRX
that use the same HSN and MA in synchronized cells are not the
same. This is to avoid the co-frequency collision. In timeslots
that use FH, the MAIO of various channels of the same TRX can
be configured differently.
Value range:
0~N-1, N is the number of TRX.
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Unit
-
Default:
-
CH type
Description:
Indicating the channel type and the function of each timeslot of all
carriers in a cell. Every cell is configured with a BCCH carrier.
Generally, the TRX ID of BCCH is fixed to be the smallest TRX
ID in the cell. The ordinary channel combinations of BCCH carrier
are as follows:
Combinations:
BCCH+7TCH
Main BCCH+SDCCH/8+6TCH
Main BCCH+2SDCCH/8+5TCH
Main BCCH+SDCCH/8+ extended BCCH(BCH)+5TCH
Main BCCH+SDCCH/8+ extended BCCH(BCH)+TCH+ extended
BCCH(BCH)+3TCH
Value range:
TCH full rate, TCH half rate 01, TCH half rate 0, SDCCH8, Main
BCCH, Combined BCCH, BCH, BCCH+CBCH, SDCCH+CBCH,
PBCCH+PDTCH, PCCCH+PDTCH, PDTCH, Dynamic PDTCH
Unit
-
Default:
-
Note:
1) The configuration of BCCH in a cell should be done
appropriately according to the channel number of the cell and the
paging capability in a LAC.
2) The main BCCH and combined BCCH are configured in
timeslot 0, and extended BCCH channel can be configured only
in timeslots 2, 4, and 6. After extended BCCH channels are
configured, the CCCH configuration parameters in the system
information table should be configured accordingly. For example,
if an extended BCCH is configured in timeslot 3) then in the
system information table, CCCH should be configured into 2
non-combined CCCHs.
4) If the cell broadcast function is available, SDCCH+CBCH
instead of SDCCH8 can be configured, or SDCCH+CBCH
instead of a TCH can be configured. If the CBCH of SDCCH/4 is
adopted, their channel type can be configured to be
BCCH+CBCH.
5) For 1 to 2 TRX, one SDCCH/8 is configured; for 3 to 4 TRX, 2
SDCCH/8s are configured; for 5 to 6 TRX, 3 SDCCH/8s are
configured. Meanwhile, the dynamic SDCCH allocation function
should be enabled and work properly.
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2.1.4 [Flow control parameter table]
Huawei GSM system provides excellent internal flow control. This function
prevents BSC’ s CPU from overloading and A interface link from being frequent
interruption. Huawei GSM system’ s internal flow control can cope with great
number of messages during sending messages globally or when NNS upgrades.
Through effective data configuration, BSC can run normally when receiving large
number of paging messages. All currently BSC versions supports flow control.
For the setting of the parameter in flow control parameter table, please refer to
the flow control guide of the corresponding version. The execution should be
performed under the guide of Huawei RNP technical support engineer.
The flow control is divided into two parts in G3BSC32.10101.08.0520B version:
l
Internal flow control
l
Abis interface flow control and TCH flow control
2.2 Site
2.2.1 [Carrier Configuration Table]
Static TRX Power class
Description:
Power class "0" shows that power is in its maximum. Each class
is 2dB less than its former class.
Value range:
0~13
Other BTS versions:
The 0529 version or above of BTS30 supports static power class
setting of level 0~10.
All versions of BTS20 support the static power setting of levels
0~10;
The microcell BTS supports the static power setting of levels
0~13.
BTS 3001C supports the static power setting of level 0~13.
Unit
-
Default:
0
Note:
Cells can be enabled to sufficiently carry traffic by setting the
"power class" parameter. If antennas are so high that they result
in serious cross-cell overlapping, the primary solution is to lower
the antenna height and increase the antenna downtilt. Reducing
the BTS power output will deteriorate indoor coverage.
The ARFCNs must be the subset of the CA.
Generally, for cells with the same priority in the network, their
power class setting should guarantee that the EIRP of every cell
is basically the same.
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is basically the same.
During power class setting, it should be noted that different
combining modes might result in the different power losses.
If FH is not enabled, only the first one among all ARFCNs in the
carrier configuration table is valid.
Carrier power type
Description:
Used to configure the carrier type, which is used to distinguish
carriers with different powers.
Value range:
40W, 60W,Default
Unit
-
Default:
Default
HW-IUO property
Description:
Indicating whether TRX should be configured as OverLaid or
UnderLaid subcell.
Value range:
OverLaid subcell, UnderLaid subcell, None
Unit
-
Default:
-
TRX priority
Description:
The priority of TRX (valid in HW_II channel allocation algorithm
only.).
Value range:
Level 0~Level 7
Unit
-
Default:
Level 0
2.2.2 [Antenna and Feeder Configuration Table]
Tower-mounted amplifier flag
Description:
Weather to use Tower-mounted amplifier.
Value range:
With tower-mounted amplifier, Without tower-mounted amplifier
Unit
-
Default:
-
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Power attenuation factor
Description:
Use to compensate the amplifier’ s gain.
Value range:
0~255
Unit
The configuration depends on the
Configuration methods are as follows:
feeder
cable
length.
The BTS2.x adopts non-CDU mode; this parameter is fixed as
10.
Default:
In the case that BTS (including 2.0 and 3.0 base stations) adopts
CDU, CDU gain should be adjusted according to the two
parameters described above.
Uplink: according to whether the tower-mounted amplifier is
used:
Tower-mounted amplifier flag
Power attenuation factor
With
tower-mounted
amplifier
Tower-mounted
amplifier
gain
–feeder cable loss
=12-4=8dB
Description
Triplex tower amplifier gain: 12.
Duplex tower amplifier gain: 14
Simplex tower amplifier gain: 14
Assuming that feeder loss: 4dB
Without tower-mounted
amplifier
0
Downlink: Without tower-mounted amplifier, power attenuation
factor is set to be 255.
2.3 Cells
2.3.1 [System information table]
System information
Description:
Use to determine whether to use a certain type of system
information. The system information is broadcasted from BTS to
MS. The system information informs all MS of the cell the
information about LAC, CGI, CA, available HSN, channel
allocation and random access control. This helps MS to locate
network resources quickly and accurately. 2bis and 5bis are
used for the 1800 network, and 2ter and 5ter are used for the
900/1800 dual -band network. For detailed system information
definitions, please refer to Protocol 0408 and system information
training materials.
Value range:
1~13. 2bis, 2ter, 5bis, 5ter, 10bis
Unit
-
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Default:
1~6. 2bis, 2ter, 5bis, 5ter
Regular transmission
Description:
Indicating whether BSC regularly updates the system information
sent by BTS. If it is set as "Yes", BSC updates the system
information being sent by BTS every interval (the interval is
determined by regular transmission interval).
Value range:
Yes, No
Unit
-
Default:
Yes
Regular transmission interval
Description:
The interval for BSC to retransmit system information to BTS.
Value range:
0~255
Unit
-
Default:
10
MS MAX retrans
Description:
The maximum times for MS being allowed to send the "Channel
Request" message during one immediate assignment process.
After the immediate assignment process starts, MS will keep
monitoring BCCH and CCCH information. If the network does not
send an Immediate Assignment or Immediate Assignment
Extend command, MS will keep retransmitting the channel
request message at every certain interval. The greater is this
parameter, the higher the call attempt success rate, the higher
call completion rate, and the greater the load on RACH and
SDCCH. See Protocol 0408.
Value range:
1, 2, 4, 7
Unit
times
Default:
-
Note:
1) The bad downlink quality might cause an MS to send SABM
message to BTS multiple times.
2) For areas where the cell radius is more than 3 kilometers and
there is a less traffic (normally the suburb or rural areas), M can
be set as 11 (i.e., the maximum retransmission times is 3) so as
to raise MS access success rate
3) For areas where the cell radius is less than 3 kilometers and
there is an average traffic (generally, it refers to the less busy
urban areas), M can be set as 10 (i.e., the maximum
retransmission times is
4) For microcell areas and obviously congested cells with a large
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traffic, M is recommended to be set as 00 (i.e., the maximum
retransmission times is 1).
5) For satellite transmission BTS, M is recommended to set to be
equal to or greater than 4.
Common access control class
Description:
Use to control load and to permit or forbid the network access of
users at certain common access levels.
Defines which access classes that are barred. Up to 16 access
classes can be defined.
Class 10 defines emergency call in the cell.
0 to 9
Access classes that are barred.
10
Emergency call not allowed for MSs belonging to
classes 0 to 9.
It may be of interest to the operator to bar the access to the
system to a certain type of MS. For this purpose it is possible to
define up to 16 different access classes of MSs and then select
the classes that can not access a cell by means of ACC (GSM
04.08, section 10.5.2.17).
The classes are defined according to GSM 02.11. Classes 0 to 9
are reserved for the operator to be used for normal subscribers
(home and visiting subscribers).
Value range:
Level 0~9 forbidd
Unit
-
Default:
000000000
Special access control class
Description:
Use to control load and to permit or forbid the network access of
users at certain special access levels.
Classes 11 to 15 are defined as follows:
11 PLMN use.
12 Security Services.
13 Public utilities.
14 Emergency services.
15 PLMN staff.
Value range:
Level 11~15 forbidden
Unit
-
Default:
00000
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Cell channel description format
Description:
The message element is a list of available absolute carrier
numbers in a serving cell. Its length is 17 bytes. To be specific,
from the D3 bit of the second byte in the cell channel description
to the D0 bit in the 17th byte, there are totally 124 bits, recorded
respectively as carriers No. 124, 123, 122.3, 2, and 1. If the Nth
bit is 1, then this Nth carrier belongs to this cell.
Value range:
Bitmap, 1024, 512, 256, 128, Variable-length
Unit
-
Default:
Bitmap
ATT
Description:
Attach-detach allowed. ATT tells the MS if it is allowed to apply
IMSI attach and detach, i.e. if the MS is allowed to send a
message to the system every time it is turned on or off (GSM
04.08, section 10.5.2.11). For different cells in the same LAC,
their ATTs must be set to be the same.
Value range:
Yes, No
Unit
-
Default:
Yes
PWRC
Description:
If BCCH carrier timeslots participate in frequency hopping,
PWRC indicate whether MS should remove the receiving level
from BCCH carrier timeslots when it calculates the average
receiving level
Value range:
Yes, No
Unit
-
Default:
Yes
UL DTX
Description:
Uplink DTX, Indicates whether the discontinuous uplink
transmission of MS is enabled in the last measuring period. See
Protocol 0508.
Value range:
Allowed, Mandatory, Forbidden
Unit
-
Default:
Mandatory
Note:
Huawei GSM supports whether to enable the downlink DTX
function in BSC. For parameter setting, please refer to "Whether
to use downlink DTX" in the cell attribute table.
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CBA
Description:
Cell Bar Access. See Protocol 0408. It can be used together with
CBQ to determine the priority of cells.
It is possible to use CBA to bar a cell (GSM 03.22 and 05.08).
When a cell is barred it is ignored by MSs in idle mode but an
active MS can perform handover to it.
Value range:
Yes (0), No (1)
Unit
-
Default:
Yes
CBQ
Description:
Cell Bar Qualify. See Protocol 0408. It can be used together with
CBA to determine the priority of cells.
For GSM phase 2 MSs, a cell can be given two levels of priority.
This is controlled by the parameter CBQ in conjunction with CBA,
as shown in below table.
The interpretation of CBA and CBQ varies depending on whether
the MS is a phase 1 MS or a phase 2 MS. For phase 2 MSs the
behaviour is also different in cell selection compared to cell
reselection.
In idle mode the MS looks for suitable cells to camp on by
checking cells in descending order of received signal strength. If
a suitable cell is found, the MS camps on it. At cell selection
with a phase 2 MS, cells can have two levels of priority, suitable
cells which are of low priority are only camped on if there are no
other suitable cells of normal priority (GSM 03.22).
Value range:
Yes (1), No (0)
Unit
-
Default:
No
CBQ
CBA
Cell selection priority
Cell reselect priority
No
Yes
Normal
Normal
No
No
Barred
Barred
Yes
Yes
Low
Normal
Yes
No
Low
Normal
Note:
The value of CBA and CBQ can affect the MS access to the
system. The above table is for Phase2 MS
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EC allowed
Description:
Emergency call allowed. For the MS at access level 0~9, the
"Yes" of this parameter indicates that emergency call is allowed;
for MS at access level 11~15, only when both the corresponding
access control class and this parameter are set to “Yes” then
emergency call be forbidden.
Value range:
Yes, No
Unit
-
Default:
Yes
Call re-establishment allowed
Description:
Whether to allow call re-establishment. For the radio link
disconnection caused by unexpected interference or coverage of
"blind spot", MS can start the call re-establishment process to
recover the conversation. Allowing call re-establishment can
reduce the number of call-drop times. This applies to suburbs or
urban areas with a bad coverage.
Value range:
Yes, No
Unit
-
Default:
Yes
NCC permitted
Description:
Network color code permitted. The value 1 stands for permitted
and 0 for forbidden. This parameter is sent in system information
2 and 6. When the cell’ s NCC is consistent with the value of NCC
permitted, then this cell will be measured by MS. And MS will
report the measurement report to BTS. This parameter consists
of one byte (8bit). Each bit is corresponding to an NCC (0~7) and
the last bit is corresponding to NCC 0. If bit N is 0, then MS will
not measure the cell level with NCC being N.
Value range:
0 allowed~7 allowed
Unit
-
Default:
1111111
Note:
As MS cannot report the adjacent cell information where NCC is
set to 0, the incorrect setting of this parameter will cause MS to
be unable to hand over during conversation. See Protocol 0508.
This parameter can be used to make MS ‘ s measurements on
some adjacent cells optionally.
CCCH-CONF
Description:
CCCH configuration.
Value range:
1 non-combined CCCH, 1 combined CCCH, 2 non-combined
CCCHs, 3 non-combined CCCHs, and 4 non-combined CCCHs.
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Unit
-
Default:
non-combined CCCH
Note:
1) Non-combined CCCH, 1 combined CCCH, 2 non-combined
CCCHs, 3 non-combined CCCHs, and 4 non-combined CCCHs.
In a corresponding BCCH multi frame, number of CCCH
message blocks are: 9, 3, 18, 27, and 36. CCCH configuration
determines the capacity of PCH, AGCH, and RACH. Generally,
the PCH capacity of every cell in a LAC should be consistent.
2) For the cell with one carrier, it is recommended to configure 1
combined CCCH. For the cells of other configurations, determine
the CCCH configuration as according to the carrier number. For
extended BCCH (including the main B and expanded BCCH), the
number of BCCH channels configured is equivalent to the
number of non-combined CCCHs configured.
Tx-integer
Description:
Use to determine the timeslot number of the interval between two
continuous requests when MS continuously sends multiple
channel requests. The purpose of this parameter is to reduce the
number of collisions on RACH which mainly affects the execution
efficiency of immediate assignment process. Tx -integer and the
CCCH configuration jointly determine the parameter S, as shown
in the following table.
S
Tx-integer
non combined CCCH
combined CCCH / SDCCH
3. 8. 14. 50
55
41
4. 9. 16
76
52
5. 10. 20
109
58
6. 11. 25
163
86
7. 12. 32
217
115
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The timeslot number that MS used for sending the first channel
request message is a random value in the set of {0, 1…MAX(T,
8)-1}.
The timeslot number for the interval between any two adjacent
channel request messages (excluding the timeslots sending the
message) is a random value in the set of {S, S+1. …S + T-1}. The
greater the Tx -integer, the greater the range for the interval of
MS to send channel request messages, and the lesser the RACH
collisions. The greater the S value, the greater the interval for MS
to continuously send channel request messages, and the lesser
the chance of collisions on the RACH channel, and the higher the
availability rate of AGCH and SDCCH channels. But the increase
of T and S will increase MS access duration, which leads to drop
in the access performance of the whole network. Generally, it
should be guaranteed that that no overloading occurs on the
AGCH and SDCCH channels and the S should be as small as
possible.
Example
If the cell has a non combined CCCH and TX=7 then the
interval between each retransmission may be
1 second (217 RACH slots),
1 sec. + 4.615 ms,
1 sec. + 2*4.615 ms,
…
1 sec. + 6*4.615 ms.
Value range:
3~12, 14, 16, 20, 25, 32, 50
Unit
RACH timeslot (equals to a TDMA frame, 4.615ms)
Default:
20
Note:
In case of large traffic, the smaller the S+T value the lower the
immediate assignment success rate. In this case, we can adjust
the T value so that S+T is greater.
In the case of satellite transmission, this value should be 32 so
as to reduce impact of satellite transmission delay.
BS_AG_BLKS_RES
Description:
Number of CCCH blocks reserved for the access grant channel.
The remaining CCCH blocks are used for the paging channel.
In each downlink non-combined SDCCH 51 frames multi-frame
there are 9 different CCCH blocks and in the combined
BCCH/SDCCH there are 3 different blocks. They can be used to:
Send paging messages, i.e. used as a Paging Channel.
Send access granted messages, i.e. used as an Access Grant
Channel.
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After an MS tunes to the BCCH/CCCH channel and decodes the
System Information, it performs an evaluation that, taking into
account the MS's own IMSI (International Mobile Station Identity)
number, determines to which particular CCCH block in the
physical channel it should listen (GSM 05.02). Every CCCH in
the physical channel (Paging Sub-channel) sends paging
messages to a certain group of MSs that are called its paging
group. The reason for the existence of such paging groups is that
the MSs can save batteries because it only needs to listen to its
own Paging Subchannel messages.
The physical channel (Paging Subchannel) sends paging
messages to a certain group of MSs. As mentioned before these
very same CCCH blocks are also used to send Access Grant
messages to the MSs, i.e. to answer a Random Access message
that an MS wanting to access the system has sent to the system.
The structure of the CCCH regarding Paging messages and
Access Grant messages can be controlled by the two
parameters: BS_AG_BLKS_RES and BS-PA-MFRAMS, and the
setting of this parameter will impact on the MS paging response
time and the system service performance.
Value range:
0~7 (non-combined BCCH), 0~2 (1 combined CCCH),
Unit
Block
Default:
2 (non-combined CCCH), 1 (combined CCCH)
Note:
If the AGCH channels are all occupied and PCH is idle, PCH can
be used as AGCH. If the reserved AGCH blocks are 0, then
immediate assignment command can be sent only on idle PCH.
Therefore, a certain CCCH should be reserved as AGCH.
BS-PA-MFRAMS
Description:
Paging Multi-frames period. Defines period of transmission for
PAGING REQUEST messages to the same paging subgroup.
Together with BS_AG_BLKS_RES, BS-PA-MFRAMS determines
the number of paging groups.
MFRMS is also used by the MS to determine down-link signaling
failure in idle mode (GSM 05.08). The downlink signaling failure
criterion is based on the downlink signaling failure counter DSC.
When the MS camps on a cell, DSC shall be initialized to a value
equal to the nearest integer to 90/N, where N is the
BS-PA-MFRAMS parameter for that cell. Thereafter, whenever
the MS attempts to decode a message in its paging subchannel;
if a message is successfully decoded DSC is increased by 1,
(however never beyond the nearest integer to 90/N), otherwise
DSC is decreased by 4. When DSC reaches 0, a downlink
signaling failure shall be declared. A downlink signaling failure
shall result in cell reselection.
Value range:
2~9
Unit
CCCH multi-frames
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Default:
2
Note:
1) A paging block (four continuous CCCH timeslots) can bear 2
IMSI paging or 4 TMSI paging or an AGCH immediate
assignment message.
2) Indicating how many multi-frames are taken as a period for a
paging sub-channel. This parameter determines how many
paging sub-channels the paging channel can be divided. MS
monitors only its paging sub-channel. See Protocol 0502 and
0508. The greater this parameter, the more the paging
sub-channels in a cell, and correspondingly the lesser the users
belonging to each paging sub-channel, which can save MS
batteries. However, the greater this parameter, the greater the
delay of paging messages, and the lower the average system
service performance. The guideline for this parameter is to make
sure that the paging channel is not overloaded and try to make
the value of this parameter as small as possible. It should be
noted that the cells within the same LAC should have basically
the same paging channel capacity.
3) MFR is set to 6 or 7 for the area with a medium paging
channel load and 4 or 5 for the area with a low paging channel
load (i.e., 4 or 5 multi frames are taken as the period of paging
groups). Normally, it is set to 2.
T3212
Description:
The periodical location updating timer. In VLR, there is another
parameter called the periodical location updating timer. The
shorter the periodical location updating time, the better the
overall network service performance, but the greater the net work
signaling load, which will lower the radio resources availability
rate. In addition, this will increase the MS power consumption, so
that the MS average standby time is greatly shortened.
Therefore, during the setting of this parameter, consideration
should be given to the processing ability of MSC and BSC, the
load of A interface, Abis interface, Um interface, HLR and VLR.
Generally, the larger value should be set for the continuous
coverage of urban area and the smaller value for suburbs, rural,
or blind spots.
Value range:
0~255
Unit
6 minutes
Default:
20~30 (urban), 10~20 (suburb), 8~10 (mountains)
Note:
1) In MSC, the periodical location updating timer must be greater
than the value of BSC.
2) Th parameter value of different cells that share the same LAC,
must be the same.
Radio Link Timeout
Description:
See Protocol 0408 and 0508. MS uses this parameter to
determine when to disconnect the connection when SACCH
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determine when to disconnect the connection when SACCH
decoding fails. Once MS is assigned with SDCCH, it starts the
timer S with its initial value being this parameter. S decreases by
1 every time when an SACCH decoding fails and S increases by
2 every time when a SACCH decoding succeeds. Thus, the
release or re-establishment of connection is guaranteed to be
performed on those connections whose quality level has
deteriorated to an intolerable level. But if the parameter is too
small, it will cause call-drop due to radio link faults. While when it
is too large, MS will not release the resource in a long time, thus
lowering the resources availability rate (this parameter works for
the downlink only).
Value range:
4~64, with a step-length of 4
Unit
SACCH period (480ms)
Default:
52
Note:
52~64 for the area with rare traffic (such remote areas).
36~48 for the area with a low traffic but a wide coverage radius
(such as suburbs or rural areas).
20~32 for the area with a high traffic (normally urban areas).
4~16 for the area with an extremely high traffic (normally covered
by micro-cells).
For cells with obvious blind spots or with serious mobile call-drop
or interruptions, this parameter should be correspondingly
increased so that there are chances to recover conversation.
MS_TXPWR_MAX_CCH
Description:
The maximum MS transmitting power level. This parameter is
sent in the BCCH system information. It affects MS behavior in
the idle mode and is used to calculate C1 and C2 values so as to
determine cell selection and cell reselection.
Value range:
0~20
Unit
grade
Default:
5(900M), 0(1800M)
Note:
1) C1 as follows:
C1 = RLA_C - RXLEV_ACCESS_MIN –
MAX ( ( MS_TXPWR_MAX_CCH- P), 0 )
RLA_C: Average MS receiving level,
RXLEV_ACCESS_MIN: The minimum receiving level for the MS
accessing the network.
MS_TXPWR_MAX_CCH-The maximum transmitting power level
of the control channel for the MS
P: The maximum transmitting power level of the MS
This parameter determines the power output adopted by an MS
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when it first accesses a cell but has not received the power
control command. See Protocol 0508. The smaller this
parameter, the greater the MS output power. MS near BTS will
cause great side-channel interference to this cell, and affect the
access and conversation quality of other MS. The greater this
parameter, the less the MS output power, and this will lower the
access success rate of MS at the edge of the cell.
2) The power levels of cells in GSM900 and GSM1800 are
correspondingly matched to different dBm values. The 32
maximum transmitting power levels for GSM900 are:
{39, 39, 39, 37, 35, 33, 31, 29, 27, 25, 23, 21, 19, 17, 15, 13, 11,
9, 7, 5, 5, 5, 5, 5, 5, 5, 5, 5,5, 5, 5, 5}
The 32 maximum transmitting power levels for GSM1800 are:
{30,28, 26, 24, 22, 20, 18, 16, 14, 12, 10, 8, 6, 4, 2, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 36, 34, 32}
RXLEV_ACCESS_MIN
Description:
Minimum MS received signal level. See Protocol 0508. It
indicates the minimum receiving signal level required for MS to
access the system.
Value range:
0~63, (-110dBm~-47dBm)
Unit
Grade
Default:
8 (-102dBm)
Note:
If this parameter is too small, it will cause MS to access network
easily. Meanwhile, the cell load and call-drop possibility will be
increased. Therefore, consideration should be given to the
balance between uplink and downlink.
Half rate supported
Description:
Used in network to inform MS whether the system supports half
rate.
Value range:
Yes, No
Unit
-
Default:
No
CRH
Description:
Cell Selection Hysteresis, used for cell reselection between
different LAC.
Each change of location area requires a location update to be
performed, which increases signaling load. In order to prevent
ping-pong effects for cell selection across location area borders,
a hysteresis, defined by CRH, is used.
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The purpose of this parameter is to avoid frequent location
updating. The greater this parameter value, the more difficult
the cell reselection between different LAC.
Value range:
0~14
Unit
2dB
Default:
4
CBCH CH Description
Description:
CBCH channel description.
Value range:
-
Unit
-
Default:
-
CBCH mobile allocation
Description:
If FH is used in CBCH channel description, then this parameter
must be set. If the No.i bit of the value is "1", it indicates that the
No.i frequency in the CA list belongs to the MA list.
Value range:
-
Unit
-
Default:
-
ACS
Description:
Additional reselection parameter indication, used to inform MS
where to get the related cell reselection parameter during cell
reselection. In the case of ACS=0, it is meaningless in system
information 3; while it is valid in system information 4, MS should
get the PI and the related parameters involving in the calculation
of C2. In the case of ACS=1, MS should get the PI and the
related parameters involving in the calculation of C2 from the
system information 7 and 8.
Value range:
Yes, No
Unit
-
Default:
No
PI
Description:
Cell reselection parameter indication, sent on the broadcast
channel. It is used to determine whether CRO, TO, and PT are
used. In fact, it informs MS whether to adopt C2 for the cell
reselection. See Protocol 0408 and 0508. The cell reselection
caused by parameter C2 has an interval of at least 5 second so
as to avoid frequent MS activation of the cell reselection process.
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as to avoid frequent MS activation of the cell reselection process.
Value range:
Yes (1), No (0)
Unit
-
Default:
Yes
Note:
The MS will calculate C1 and C2 of the serving cell at a minimum
of every 5 seconds. When necessary, it will re-calculate C1 and
C2 value of all non-serving cells (adjacent cells). The MS
constantly checks the following conditions:
Whether the path loss (C1) of the current serving cell drops
below 0 within 5s. If yes, it shows too much path loss of this cell.
The C2 value of a suitable non-serving cell always exceeds that
of serving cells in 5s, and meets the following conditions:
1) If a new cell is in a different location area, the C2 value of this
new cell minus CRH (from the system information of the serving
cell) constantly exceeds the C2 value of the serving cell for 5s
period.
2) If a cell reselection has occurred within the last15s, then the
C2 value of the new cell minus 5dB constantly exceeds the C2
value of the serving cell for 5s period.
A new cell that meets the conditions above is a better cell. When
a better cell exists, the MS will have cell reselection. Cell
reselection will not occur within 5s after the last reselection.
CRO
Description:
Cell reselection offset. It indicates the C2 value can be
corrected manually. See Protocol 0508 and 0408. This parameter
affects only GSM Phase II MS.
Value range:
0~63. Corresponding level value: 0~126db.
Unit
2dB
Default:
0
Note:
The setting of RXLEV-ACCESS-MIN and CRO should guarant ee
that cells with same priority have the same cell reselect offset.
Otherwise, something abnormal will occur.
TO
Description:
Cell reselection temporary offset, indicating the temporary
correction value of C2. It works only during the "cell reselection
penalty time" period. See Protocol 0508 and 0408. This
parameter affects only the GSM PhaseII MS.
Value range:
0~7. The corresponding value: 0~60db and 7 corresponds to
"infinite"
Unit
-
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Default:
0
PT
Description:
Cell reselection penalty time, a parameter to ensure the safety
and validity of cell reselection Its main function is to avoid too
frequent MS cell reselection. See Protocol 0508 and 0408. This
parameter affects only the GSM PhaseII MS.
Value range:
0~31. The corresponding time is 20~620s, 31 is a reserve value
used to change the effect of the CRO on C2.
Unit
-
Default:
0
Note:
After the MS completes cell selection, the MS in idle mode starts
the cell reselection process to select a better serving cell. It is C2
that determines cell reselection. The principle of MS reselection
is to select the cell with the maximum C2 value as compared with
the serving cell. C2 calculation is as follows:
C1= (receiving signal level max(MS_TXPWR_MAX_CCH - PL, 0)
RXLEV_ACCESS_MIN)
-
C2=C1+CRO-TO*H(PT-T)(PT <31)
C2=C1-CRO (PT = 31)
PL is the maximum power output of MS
CRO values can be 0, 1. ...63. The unit is a level value,
corresponding to 0=0dB; 1=2dB; ...63=126dB.
TO values can be 0, 1. ...7
0=0dB; 1=10dB; ...6=60dB; 7=Infinite
H()=0
if PT-T<0
H()=1
if PT-T>0
PT value can be 0, 1. ...31
0=20s; 1=40s; ...30=620s
T is the timer, started from zero at the point at which the cell
was placed by the MS on the list of strongest carriers. T is
reset to zero whenever the cell is no longer on the list of
strongest carriers. This will tend to prevent fast moving MSs
from selecting the cell (GSM 03.22).
This shows that C1 reflects the radio channel quality. The greater
the C1, the better the channel quality. But the C2 value is
manually corrected and can be adjusted by CRO. Thus, the C2
value can be calculated accordingly to CRO, TO, and PT so as to
reselect the serving cell. For example, we can set CRO so that
the C2 value of GSM1800 is greater than that in GSM900. Thus,
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even in cases that the signal strengt h in the GSM1800 cell is
lower than that in GSM900, MS still can reselect GSM1800 cells
as serving cell.
ECSC
Description:
Early ClassMark Sending Control. Indicates if an MS in the cell is
allowed to use early ClassMark sending. See Protocol 0408.
After receiving the class mark change message, MS will send
additional ClassMark message to the network as soon as
possible. CM3 (ClassMark 3) message includes the information
about MS power, multiband and/or multislot capability. To
perform handover between different bands, the power level must
be described correctly. In the process of paging and sending of
the BA2 information between different bands, the CM3 message
must be known.
Value range:
Yes, No
Unit
-
Default:
No
Note:
1) ECSC is invalid for single-band MS. For dual-band MS, when
ECSC is not used, after the MS sends EST IND, MSC will still
send the CLASSMARK REQUEST message, and MS will
response with the CLASSMARK UPDATE message, and other
functions are not affected. For the dual -band MS, when this
parameter is set to No, the connection time between different MS
will be obviously shortened.
2) When the encryption function is enable, The parameter must
be set to “ Yes” .
Power deviation indication
Description:
Determines whether to calculate the power deviation of CM3 MS
of DCS1800.
Value range:
Yes, No
Unit
-
Default:
No
Power deviation
Description:
After accessing on RACH, if CM3 MS of DCS1800 does not
receive the original power control command, its power output =
the maximum MS transmitting power level + the power deviation.
See Protocol 0508.
Value range:
0~3. The corresponding values: 0db. 2db. 4db. 6dB
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Unit
-
Default:
1
MBR
Description:
Multiband reporting. Used to inform MS to report the information
about adjacent cells of multiband and this report is sent in system
information 2ter and 5ter. No matter which band they belong to,
when its value is "0", MS reports MRs of 6 strongest adjacent
cells,. When its value is "1", MS reports MR of an adjacent cell
with the strongest signal in each band. The rest the MRs belong
to the adjacent cells of the current band. When its value is "2",
MS reports MR of two adjacent cells with the strongest signal in
each band. The rest the MRs belong to the adjacent cells of the
current band. When its value is "3", MS reports MR of three
adjacent cells with the strongest signal in each band. The rest the
MRs belong to the adjacent cells of the current band. See
Protocol 0508. When the traffic of each band is basically the
same and there is no special requirement on the band, this
parameter is set to "0". When the traffic of each band is obviously
different and MS is expected to preferably accessing to a certain
band, this parameter is set to "3". In other cases, it is set to "1" or
"2".
Value range:
0~3
Unit
-
Default:
0
2.3.2 [Cell configuration data table]
Data service allowed
Description:
Indicates which data service is supported. The value
"0100000000" indicates only the NT 12K HALF RATE data
service is supported. The specific value should be set according
to the actual situation.
Value range:
NT 12K FULL RATE, NT 12K HALF RATE, NT 12K, NT 6K, T
9.6K, T 4.8K, T 2.4K, T 1.2K, T 600 BITS and T 1200/75
Unit
-
Default:
0000000000
Speech version
Description:
Indicates which type of speech version is supported. The value
"111000" indicates that the full rate version 1~3 are supported
and the half rate version 1~3 are not supported.
Value range:
Support full rate version 1, support full rate version 2, support full
rate version 3, support half rate version 1,support half rate
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version 2, and support half rate version 3.
Unit
-
Default:
111000
Note:
1) The difference between speech versions: The version 1 is full
rate speech codec (FR, the rate is 13kb/s), the version 2 is
enhanced full rate speech codec (EFR, the rate is 12.2kb/s), and
the version 3 is not available for the time being.
2) Normally, EFR function can be supported by all dual -band MS.
Meanwhile, it needs the support of the corresponding FTC board
versions (FTC13 of BSC).
3) The circuit pool number of the A interface determines which
speech version is supported.
The number of A interface circuit pool will determine the selection
of speech versions.
Speech version priority
Description:
Used to select the speech version supported in priority.
Value range:
Support full rate version 1, support full rate version 2, support full
rate version 3, support half rate version 1,support half rate
version 2, and support half rate version 3.
Unit
-
Default:
Support full rate version 1
Encryption algorithm
Description:
Determines which encryption algorithm is used. This parameter
should not be composed of all 0s. "1000000" indicates that the
encryption is not used.
Value range:
Not supporting encryption, A5/1~A5/7
Unit
-
Default:
10000000
Note:
Encryption algorithm should be consistent between the BSS and
the NSS. It should be first described in MAP functional flow of
MSC that whether the system needs to encrypt and which
encryption algorithm the system uses. The final selection of
encryption algorithm is determined by BSC data configuration
and the MS capability.
The version of BTS3.X 04. 0529 supports encryption algorithm
selection. Currently, all 0520B series versions of BSC support the
encryption algorithm. For the G3BSC32.10101.08.0520B version
or above, it is recommended to use encryption algorithm.
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BCCH mutual support
Description:
Ndicates that when the main BCCH is having fault, other TRXs in
the cell can be used to take over the jobs of the faulty BCCH
TRX.
Value range:
Yes, No
Unit
-
Default:
Yes
Note:
This function cannot be simultaneously used together with
baseband timeslot FH.
FH mode
Description:
Determines whether the frequency hopping is used and which
frequency hopping mode is used.
Value range:
Not FH, baseband FH, RF FH
Unit
-
Default:
Not FH
SMCBC DRX
Description:
Short message of cell broadcast DRX mode. See the related
materials on the cell broadcast.
Value range:
Yes, No
Unit
-
Default:
No
Note:
If the cell broadcast message function is used, it must be set to
"Yes". Otherwise, it must be set to "No".
DL DTX
Description:
Ndicates whether to use downlink DTX in a cell. The DTX switch
in MSC is still functional. When MSC forbids downlink DTX, then
downlink DTX cannot be used in BSC. When MSC allows
downlink DTX, then downlink DTX in BSC is determined by BSC
DL DTX.
Value range:
Yes, No
Unit
-
Default:
Yes
BCCH mutual recovery
Description:
When the faulty BCCH TRX become normal, the main BCCH will
recover its original configuration state. This is called BCCH
Mutual Switchback. The way to switchback is determined by this
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parameter. If it is configured as immediate switchback, once the
main BCCH has recovered, immediate switchback is performed.
If it is configured as switchback during resource check, then
switchback is done only during resource check.
Value range:
Switchback during resource check, Immediate switchback, No
switchback
Unit
-
Default:
No switchback for timeslot FH, Switchback during resources
check for other FHs and non-FH.
Note:
This function can be set dynamically, without command word.
BBFH TRX mutual support
Description:
Indicates whether to support the switchover function when the
TRX that participates in baseband FH is faulty. When this
function is used and if a baseband FH TRX is faulty, the system
will adjust the FH configuration and remove the faulty TRX from
FH set. The system can guarantee the FH of other TRXs,
Value range:
Yes, No
Unit
Default:
Yes for timeslot FH, No for the non-timeslot FH.
BBFH TRX mutual recover
Description:
Indicates whether to support the switchback function when the
TRX that participates in baseband FH is faulty. When this
parameter is set to no switchback, the TRX can work as non-FH
TRX.
Value range:
Switchback during resources check, immediate switchback, no
switchback
Unit
-
Default:
No switchback for FH timeslot, Switchback during resources
check for non-timeslot FH.
Note:
This function can be set dynamically, without command word.
2.3.3 [Cell Allocation Table]
Namely the CA list. The CA table mainly configures the available frequencies and at
most 64 frequencies can be configured.
According to the GSM 900 recommendations the channels are numbered as follows:
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fl(n) = 890.2 + 0.2*(n
1) in MHz, where n (A bsolute Radio Frequency Channel
Number, ARFCN) goes from 1 to 124 and fl is a frequency in the lower band, BTS
receiver.
fu(n) = fl(n) + 45 in MHz, where n goes from 1 to 124 and fu is a frequency in the upper
band, BTS transmitter.
According to the DCS 1800 recommendations the channels are numbered as follows:
fl(n) = 1710.2 + 0.2*(n
512) in MHz, where n (Absolute Radio Frequency Channel
Number, ARFCN) goes from 512 to 885 and fl is a frequency in the lower band, BTS
receiver.
fu(n) = fl(n) + 95 in MHz, where n goes from 512 to 885 and fu is a frequency in the
upper band, BTS transmitter.
The configuration principle is as shown in the following example. For example, if a BTS
S5/5/5 is to be configured, its cell allocation table is as follows:
Module ID
Cell ID
ARFCN 0
ARFCN 1
ARFCN 2
ARFCN 3
ARFCN 4
ARFCN
Not filled
2
51
45
59
68
77
86
2
52
49
62
71
80
89
2
53
53
92
65
74
83
…
BSC sends the cell CA list to MS through system information.
For the sake of forming a regulation, it is recommended to set ARFCN 0 as BCCH.
2.3.4 [BA1 Table]
Namely BA1 list, used to inform the MS in the idle mode to research the BCCH
frequencies of adjacent cells. BA list is sent through system information 2, 2bis, and
2ter. The MS in the idle mode keep monitoring the information about BCCH frequencies
in the BA list so as to initiate the cell reselection process. The frequencies in BA list
should be the consistent with the configuration of neighboring cells.
2.3.5 [BA2(SACCH) table]
Namely BA2 list, used to inform the MS in the active mode to search the BCCH
frequencies of adjacent cells. BA list is sent through system information 5, 5bis, and
5ter.
Note:
During network optimization, all BCCH frequencies in the network
can be put into the BA2 table so as to use the performance
measuring function of the undefined adj acent cells in the traffic
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statistics console to find out the adjacent missing cells.
It is recommended that the maximum frequencies should not
exceed 15.
2.3.6 [Cell Attribute Table]
Interf. band Thrsh. 0
Description:
BSS measures the uplink status of the radio channels occupied
by MS, calculates and reports the interference of the idle channel
so as to facilitate BSC to decide channel assignment.
Interference is manually classified into 6 levels according to the
interference signal strength.
Value range:
110~85
Unit
dBm
Default:
Fixed as 110.
Interf. band Thrsh. 1
Description:
See above description of Interf. band Thrsh. 0.
Value range:
110~85
Unit
dBm
Default:
105
Interf. band Thrsh.2
Description:
See above description of Interf. band Thrsh. 0.
Value range:
110~85
Unit
dBm
Default:
98
Interf. band Thrsh. 3
Description:
See above description of Interf. band Thrsh. 0.
Value range:
110~85
Unit
dBm
Default:
90
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Interf. band Thrsh. 4
Description:
See above description of Interf. band Thrsh. 0.
Value range:
110~85
Unit
dBm
Default:
87
Interf. band Thrsh. 5
Description:
-
Value range:
110~85
Unit
dBm
Default:
Fixed as 85
Interf. calculation period
Description:
The interference level on the idle channel is averaged before
radio resources indication messages are sent, The averaged
result is used to classify the interference level into 5 interference
bands. This parameter is the period of averaging the interference
level. See Protocol 0808, 0858, and 1221.
Value range:
1~31
Unit
SACCH period (480ms)
Default:
20
SACCH multi-frames
Description:
Used to determine whether the uplink radio link connection fails.
BSS will judge whether the radio link failure as according to
uplink SACCH BER. See Protocol 0508, 0858, and 0408.
When BTS receives the uplink MRs on SACCH, it will set this
parameter as the initial value of the timer which is used to judge
the radio connection failure. Every time BTS fails to decode the
MR sent from MS, this timer minus 1 and plus 2 every time BTS
succeeds to decode the MR. When the timer reaches 0, then it
judges that the radio connection fails. Then BTS sends a
message of radio connection failure to BSC. This parameter and
the radio link timeout are used to judge the uplink/downlink radio
connection failure.
Value range:
0~255
Unit
SACCH period (480ms)
Default:
31
Note:
For the version BTS3X 04.0529 or earlier, the maximum of this
parameter is 16. For the later versions, it is 31.
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Radio resource report period
Description:
BTS needs to periodically inform BSC of the interference level of
idle channel on every TRX through the radio indication message.
This parameter specifies the interval for sending the message.
Value range:
0~255
Unit
second
Default:
10
CCCH load indication period
Description:
If the load of a certain CCCH exceeds the related threshold, BTS
should periodically send CCCH overload messages to BSC.
CCCH overload includes RACH overload and PCH overload.
This parameter indicates the interval of the BTS for sending
overload message. A very small value of this parameter will
cause a large signaling traffic of Abis interface. If this value is set
too large, BSC may not be able to handle BTS abnormality in
time.
Value range:
0~255
Unit
Second
Default:
15
CCCH load Thrsh.
Description:
If the load of a certain CCCH exceeds this threshold, BTS should
periodically send CCCH overload messages to BSC. If the value
of this parameter is too low, BTS is more likely to report CCCH
overload message to BSC. In this case MS is more difficult to
access the system and thus lower the resource utilization. If the
value is too high, BTS will report overload message to BSC only
when the system resource is in shortage. This will cause the
system fault more easily.
Value range:
0~100
Unit
%
Default:
80
Max resend times of Phy. Info.
Description:
During the asynchronous handover, MS constantly sends the
handover access Burst to BTS. When BTS detects the Burst,
BTS send a physical information to the MS on the main
DCCH/FACCH, and starts timer T3105. At the same time, it
sends the MSG_ABIS_HO_DETECT message to BSC. The
physical information contains related information of different
physical layers so as to guarantee the correct access of MS. If
the timer T3105 times out before receiving the SAMB frame from
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the timer T3105 times out before receiving the SAMB frame from
MS, BTS re-sends physical information to MS.
This parameter specifies the maximum times Ny1 for re-sending
physical information. If the number of resending times exceeds
Ny1 and BTS still has not received any correct SAMB frame from
MS, BTS will send BSC the connection failure message and
handover failure message. After BSC receives the messages, it
will release the assigned dedicated channel and stop timer
T3105. See Protocol 0858 and 0408. The value of this parameter
can be increased correspondingly when the handover becomes
slow and handover success rate is low which is caused by clock
or bad transmission condition.
Value range:
1~255
Unit
times
Default:
30
Note:
When Ny1 * T3105 > the duration between EST IND and HO
DETECT, MS handover will succeed. Otherwise, MS handover
will fail.
T3105
Description:
T3105 is a timer for radio connection. See the description of Max
resend times of Phy. Info.
Value range:
0~255
Unit
10ms
Default:
7
Overload indication period
Description:
Specifies the interval for BTS to send the overload message to
BSC. Overload includes TRX processor overload, downlink
CCCH overload and AGCH overload. See Protocol 0858.
Value range:
0~255
Unit
second
Default:
15
RACH busy Thrsh
Description:
The threshold level that judges whether the RACH is busy.
Value range:
0~63, (-110dBm~-47dBm)
Unit
Grade
Default:
5 (BTS20, BTS22C), 16 (BTS3X)
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RACH min. access level
Description:
The "RACH minimum access level" of the version 03.0529 of
BTS3X or above will affect MS access. This parameter indicates
the threshold level at which the system determines MS random
access. Only when the level on RACH exceeds this threshold will
BTS regard the access to be successful.
Value range:
0~255
Unit
Grade
Default:
5
Note:
The value of RACH busy Thrsh. should be greater than RACH
min. access level.
To avoid MS being unable to set up call even it is in the coverage
area, consideration should be given to BTS sensitivity and MS
RXLEV_ACCESS_MIN during the setting of this parameter.
Average RACH load TS number
Description:
Indicates the duration of judging whether RACH timeslot is busy,
i.e., the number of RACH Burst during one RACH occupancy
detection. If the value of this parameter is too low, BTS is more
likely to report RACH overload message to BSC. This will cause
that MS more difficult to access the system and lower the
resource utilization. If the value is too high, only when the system
resource is in shortage will BTS report overload message to BSC
which is likely to cause the system fault.
Value range:
0~65535
Unit
timeslot number
Default:
5000
Max RC power reduction
Description:
Specifies the maximum level of BTS RF power that can be
decreased.
Value range:
0~255
Unit
2dB
Default:
5
T200 SDCCH(5ms)
Description:
The value of T200 on SDCCH.
Value range:
1~255
Unit
5ms
Default:
60
Note:
The T200 timer (Timer200) is an important timer about data link
layer LAPDm of the Um interface. Different timer values should
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layer LAPDm of the Um interface. Different timer values should
be set for different LAPDm channels such as SDCCH, FACCH
and SACCH. This is because these channels have different
transmission rate. The T200 timer is used to avoid deadlock
during data transfer on the data link layer. The communication
entities of both ends of such data links adopt the sending of
acknowledgment mechanism. That is to say, every time message
is sent, the opposite end is requested to acknowledge the
reception. If this message is lost for unknown reasons, it will
occur that both ends keep waiting, leading to system dead lock.
Therefore, a timer should be started when the sender sends a
message. If the timer times out, the sender will regard that the
receiver has not received the message and will resend the
message.
T200 FACCH/F
Description:
The value of T200 on FACCH/F.
Value range:
1~255
Unit
5ms
Default:
50
T200 FACCH/H
Description:
The value of T200 on FACCH/H.
Value range:
1~255
Unit
5ms
Default:
50
T200 SACCH TCH SAPI0
Description:
The value of T200 on TCH SAPI0.
Value range:
1~255
Unit
5ms
Default:
150
T200 SACCH TCH SAPI3
Description:
The value of T200 on TCH SAPI3.
Value range:
1~255
Unit
5ms
Default:
200
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T200 SACCH SDCCH
Description:
The value of T200 on SACCH and SDCCH.
Value range:
1~255
Unit
5ms
Default:
60
T200 SDCCH SAPI3
Description:
The value of T200 on SACCH SAPI3.
Value range:
1~255
Unit
5ms
Default:
60
MAX TA
Description:
Maximum Time Advance. Determines the actual coverage area
of BTS. When BTS receives the channel request message or
handover access information, it determines whether channel
assignment or handover should take place in the current cell by
comparing the TA with the value of this parameter.
Value range:
0~255
Unit
bit period (1 bit = 0.55km)
Default:
62 for normal cell, 63 for single TS extended cell, and 219 for
dual TS extended cell.
Note:
The value range of MAX TA for normal cells is 0~63.
Frame start time
Description:
The frame number of the BTS start timeslot that is used to keep
synchronization between BTS and MS after base station has
re-initialize.
Value range:
0~65535
Unit
Frame number
Default:
65535
Paging times
Description:
In BTS2.X, this parameter is used for BTS to determine whether
paging is resent. Together with the paging times configured in
MSC, they jointly control the paging resend times. The total
paging times approximate to be the multiplication of the two.
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Value range:
0~255
Unit
times
Default:
1
Note:
The MSC paging resend strategy is as follows:
1) MSC6.0 can resend paging message at most 4 times, and the
resend intervals are 3 seconds, 3 seconds, 2 seconds, and 2
seconds respectively.
2) Within 2 seconds after the last paging message is sent, i.e., 12
seconds after the first paging message is sent, if there is no
paging response from MS, MSC will regard it as timeout.
MSC can adopt two types of paging modes: TMSI and IMSI.
Random access error Thrsh
Description:
The system can determine whether a received signal is an MS
random access signal by judging the dependency on the training
sequence (41bit). This parameter defines the dependency of the
training sequence. If the value of this parameter is too small,
there will be a high random access signal error tolerance, so that
MS random access will be easy but the misreport will also be
high. If the value is too large, the MS misreport rate will be low,
but the normal access will be hard.
Value range:
0~255
Unit
-
Default:
180
DC bias voltage Thrsh.
Description:
This parameter is used to compensate the RSSI difference of
whether there is tower-mounted amplifier. This is to guarantee a
correct RSSI value in the case of without tower-mount ed
amplifier. The value of this parameter in the case of without
tower-mount amplifier is greater than the case of with
tower-mount amplifier by 3.
Value range:
1~255
Unit
dB
Default:
0 for with tower-mounted amplifier, 3 for without tower-mounted
amplifier
Cell extension type
Description:
Indicates whether a cell is an extended cell and the extended cell
mode. Single timeslot extension is based on the fixed delay
extension and dual timeslot extension is based on classic
solution extension.
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The single timeslot extended cell adopts IUO to obtain a wide
coverage. The radius difference between OverLaid subcell and
UnderLaid subcell does exceed 35km. BTS increases fixed delay
between the downlink transmission and uplink receiving for the
UnderLaid subcell. MS and BTS can work normally when they
use the normal TA value. Theoretically, In this mode, Huawei
BSS provides the extended cell with a maximum coverage of
70km.
The dual timeslot extended cell combines two timeslots to
provide sufficient delay. Theoretically, a maximum TA value of
219 is supported, i.e., 120km coverage radius. Dual extended
timeslot cell can be divided into two types: cell class and TRX
class.
Value range:
Normal cell, Single timeslot extended cell, Dual timeslot extended
cell
Unit
-
Default:
Normal cell
Note:
The dual timeslot extended cell is supported in Huawei BSC of
G3BSC32.1120 version or above.
Cell extension offset
Description:
As the GSM time advance has a limit of 63 bits, so the radius of a
cell cannot exceed 35Km. This parameter indicates the coverage
radius of normal cell.
Value range:
0~35
Unit
Km
Default:
0 (normal cell), 34 (single timeslot extended cell)
Note:
This parameter is recommended to be as according to the
coverage radius of normal cell measured in drive test. For the
single timeslot extended cell, the actual Cell Extension Offset
should not be set exactly as 34. There must be overlapping area
between normal cells and extended cells.
2.3.7 [Cell Alarm Threshold Table]
Power output error Thrsh.
Description:
Used in BTSM. When the output power of a TRX is different from
a nominal value, errors will occur.
There are two error
thresholds used to generate alarm:
Power Output Error
Threshold and Power Output Reduction Threshold.
Value range:
0~9, indicating -10dB~-1dB respectively
Unit
-
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Default:
2
Power output reduction Thrsh
Description:
See the description of Power Output Error Threshold.
Value range:
0~18
Unit
-
Default:
2
VSWR TRX error Thrsh
Description:
VSWR TRX error threshold.
Value range:
0~18
Unit
-
Default:
2
VSWR TRX unadjusted Thrsh
Description:
VSWR TRX unadjusted threshold.
Value range:
0~18
Unit
-
Default:
2
2.3.8 [Cell call control table]
TCH immediate assignment
Description:
Option "Yes" means that TCH channel can be immediately
assigned as signaling and traffic channel when SDCCH has no
available resource. The option "No" means that only SDCCH can
be assigned.
Value range:
Yes, No
Unit
-
Default:
No
Immediate assignment Opt.
Description:
Option "Yes" means it is allowed to optimize assignment of
channels activated by BTS when there are multiple MS access
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requests. This is to guarantee network response speed.
Value range:
Yes, No
Unit
-
Default:
No
Note:
This parameter is mainly used for satellite transmission, i.e., to
reduce the impact of satellite transmission delay. For terrestrial
transmission, it is recommended to be set to “ No” .
Immediate assign to other cell
Description:
The option "Yes" means that it is allowed to assign SDCCH
channel between cells when there is MS access request. After
the system receives the access request, it can immediately
assign SDCCH of other cells to MS.
Value range:
Yes, No
Unit
-
Default:
No
Assign to other cell
Description:
When SDDCH is occupied, the option "Yes" means it is allowed
to assign TCH and terrestrial circuit of other cells during
assignment.
Value range:
Yes, No
Unit
-
Default:
Yes
TCH assignment retry
Description:
The option "Yes" means that assignment retry is allowed if
assignment fails during TCH assignment.
Value range:
Yes, No
Unit
-
Default:
No
Intra-cell SD to TCH HO
Description:
The option "Yes" means to allow MS handover from a SDCCH to
the TCH of the serving cell.
Value range:
Yes, No
Unit
-
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Default:
Yes
Inter-cell SD to TCH HO
Description:
The option "Yes" means to allow MS handover from a SDCCH to
the TCH of other cells.
Value range:
Yes, No
Unit
-
Default:
Yes
OM start intra-cell HO
Description:
Indicates whether to support the compulsory intra-cell handover
originated by OM.
Value range:
Yes, No
Unit
-
Default:
Yes
OM start inter-cell HO(intra-BSC)
Description:
Indicates whether to support the compulsory intra-BSC inter-cell
handover originated by OM.
Value range:
Yes, No
Unit
-
Default:
Yes
OM start inter-BSC HO
Description:
Indicates whether to support the compulsory inter-BSC handover
originated by OM.
Value range:
Yes, No
Unit
-
Default:
Yes
TCH overload alarm
Description:
Whether to enable the TCH overload alarm function.
Value range:
Yes, No
Unit
-
Default:
No
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RF CH abnormal release retry
Description:
Whether to allow release retry when BTS radio channel release
is abnormal.
Value range:
Yes, No
Unit
-
Default:
Yes
Abis flow control permitted
Description:
Whether to allow performing flow control for Abis interface.
Value range:
Yes, No
Unit
-
Default:
No
TCH flow control allowed
Description:
Indicates whether to allow flow control for TCH.
Value range:
Yes,
Unit
-
Default:
No
Circuit pool
Description:
Circuit pool is a circuit property. BSC can check whether the
circuits assigned by MSC support the related services when the
circuit pool is enabled. The function of circuit pool is to classify
circuits according to circuit bearing capability and service type. If
the assigned circuit does not support the related service, the
assignment will fail. For example, if the assigned circuit is in the
circuit pool 1 and the expected speech service is EFR; this will
lead to assignment failure because the EFR is not supported by
circuit pool 1. Only when enabled by both BSC and MSC
simultaneously will the circuit pool function work.
Value range:
select circuit pool, deselect circuit pool, system automatic
selection
Unit
-
Default:
select circuit pool function
Note:
If EFR is used, the circuit pool function must be enabled.
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Direct retry
Description:
Whether to allow TCH direct retry to other cells.
Value range:
Yes, No
Unit
-
Default:
Yes
2.3.9 [Cell Call Control Parameter Table]
T3101
Description:
Used to limit the duration of immediate assignment.
Value range:
3~50
Unit
100ms
Default:
30
Assign-TCH idle rate Thrsh.
Description:
Only when SDCCH resource is used up and TCH idle rate
reaches this threshold will TCH immediate assignment be
allowed.
Value range:
0~100
Unit
%
Default:
80
Assign-TCH re-Estb. rate thrsh.
Description:
When the history record of TCH call re-establishment success
rate reaches this threshold, TCH immediate assignment can be
allowed.
Value range:
0~100
Unit
%
Default:
80
TCH flow control start thrsh.
Description:
Only when the number of idle TCH timeslots is less than this
threshold can TCH flow control be started.
Value range:
0~7
Unit
idle TCH timeslots in a cell
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Default:
2
Max assignment retry times
Description:
Max Assignment Retry Times is valid only when the TCH
Assignment Retry is set to "Yes".
Value range:
0~3
Unit
times
Default:
2
Idle TCH Thrsh. for SD to TCH HO
Description:
When the idle rate of TCH reaches this threshold, MS is allowed
to directly hand over from SDCCH to TCH. The parameter is
valid when SDCCH-to-TCH handover in the cell is "Yes".
Value range:
0~100
Unit
%
Default:
80
Max. radio CH release retry times
Description:
Indicates the maximum release retry times allowed when the
abnormal release of radio channel occurs.
Value range:
0~3
Unit
times
Default:
1
Service type Req.(SD to TCH HO)
Description:
Indicates the allowed service request type when the handover
between SDCCHA and TCH occurs.
Value range:
MSC service request, Location updating request, Paging
response, MSC service re-establishment request, Unknown
Unit
-
Default:
MSC service request
Syst. delay frame No. adj. value
Description:
Used to adjust frame number shift caused by the distance
between two cabinets exceeding 3m.
Value range:
0
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Unit
-
Default:
0
Response on out BSC HO Req.
Description:
Determines whether to response to a request. For example, after
BSC sends a handover request to MSC, MSC will check the
radio channel resource and terrestrial circuit resource; then it
might response the BSC request. If this parameter is set as "No"
and MSC finds that there is no resource available, MSC will not
response a Handover Reject to BSC. Thus, in traffic statistics, it
can be found that the number of handover requests > successful
handover times + handover failure times.
Value range:
Yes, No
Unit
-
Default:
Yes
2.3.10 [Cell module information table]
Description:
CGI and module ID used to find the target cell during handover.
The incorrect configuration of the table will lead to handover
failure.
2.4 Handover
The following table shows the 16 Bit criterions in BSC handover algorithm used for
sorting candidate cells. BSC will finally select the target cell according to handover type
and cell sorting result of candidate cells.
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Bits No. 1-3: Sort according to the downlink receiving level (combine the receiving level
and the corresponding penalty).
Bit No. 4: Used to indicate the comparison result of handover hysteresis between
intra-layer cells. For serving cell, the bit is constantly 0. If the receiving level of adjacent
cell - the receiving level of the serving cell > the inter-cell Handover Hysteresis, then
the bit of this adjacent cell is 0. If the receiving level of adjacent cell - the receiving level
of the serving cell < the inter-cell Handover Hysteresis, then the bit of this adjacent cell
is 1.
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Bits No. 5-10: Used for hierarchical cells, totally 6 bits. The system can classify the cells
into 64 priorities.
Bit No. 11: Load adjustment bit, used for serving cells. If the traffic load ≥ Load HO
Thrsh., this bit is 1. Otherwise, it is 0. If the candidate cell is an adjacent cell, and the
load ≥ Load Req. on Candidate Cell, this bit is 1. Otherwise, it is 0. For Load HO Thrsh.
and Load Req. on Candidate Cell, see Load Handover Data Table.
Bit No. 12: Used for co-BSC adjustment bit and determined by parameter Co-BSC/MSC
Adj. When this parameter is set to "Yes", intra-BSC handover is done in priority.
Bit No. 13: Used for co-MSC adjustment bit and determined by parameter
Co-BSC/MSC Adj. When this parameter is set to "Yes", intra-MSC handover is done in
priority.
Bit No. 14: Inter-layer handover hysteresis bit. When the receiving level of an adjacent
cell > Inter-layer HO Thrsh. + Inter-layer HO Hysteresis, and the receiving level of the
serving cell > Inter-layer HO Thrsh. - Inter-layer HO Hysteresis, then it is 0. Otherwise,
it is 1.
Bit No. 15: Cell type adjustment bit (applicable for single timeslot extended cell with the
maximum radius being 70kms). For the extended cell, this bit is 1. For normal cells, it is
0.
Bit No. 16: Reserved bit
2.4.1 [Handover control data table]
HO algorithm
Description:
To select handover algorithm.
Value range:
Huawei handover algorithm, GSM0508 handover algorithm
Unit
-
Default:
Huawei handover algorithm
Note:
At present, only Huawei handover algorithm is available.
Min interval for TCH HOs
Description:
When a new TCH is assigned, a timer should be started. Only
when this timer times out will handover be allowed. This
parameter is the duration for this timer. This parameter is used to
avoid incorrect handover due to inaccurate MRs at the early
stage of call establishment. The value of this parameter when
MR is pre-processed by BTS should be smaller than that when
MR is not pre-processed by BTS.
Value range:
1~60
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Unit
Second
Default:
6
Min interval for SD HOs
Description:
When a new SDCCH is assigned, a timer should be started. Only
when this timer times out will handover be allowed. This
parameter is the duration for this timer. This parameter is used to
avoid incorrect handover due to inaccurate MRs at the early
stage of call establishment. The value of this parameter when
MR is pre-processed by BTS should be smaller than that when
MR is not pre-processed by BTS.
Value range:
1~60
Unit
second
Default:
2
Min interval for consecutive HOs
Description:
This parameter is used to prevent consecutive handovers that
can result in bad network performance. After BSC sends a
handover command, it will start a timer. BSC will not perform any
handover before this timer times out. This parameter is the
duration for this timer.
Value range:
1~60
Unit
second
Default:
6
Min interval for Emerg. HOs
Description:
When BSC completes or fails to perform an emergency
handover, it will start a timer. BSC will not perform any
emergency handover before this the timer times out. This
parameter is the duration for this timer.
Value range:
1~60
Unit
second
Default:
6
Co-BSC/MSC Adj
Description:
Indicates whether to adjust a candidate cell sorting so as that
handover in the same BSC/MSC is in priority.
Value range:
Yes, No
Unit
-
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Default:
Yes
SD HO allowed
Description:
Determines whether to allow the handover between signaling
channels.
Value range:
Yes, No
Unit
-
Default:
No
Penalty allowed
Description:
Indicates whether penalty is given to certain candidate cells,
including the target cell that has handover failure history and the
cell that has emergency handover history due to too large value
of TA or bad quality.
Value range:
Yes, No
Unit
-
Default:
Yes
Intra-cell HO allowed
Description:
Determines whether intra-cell handover is allowed. Intra-cell
handover includes timeslot and TRX change. Intra-cell handover
can reduce the impact of "Rayleigh" fading or interference.
Value range:
Yes, No
Unit
-
Default:
No
Note:
This parameter is invalid for the IUO handover.
Load HO allowed
Description:
Indicates whether Traffic load-sharing handover is allowed.
Load-sharing can reduce the cell congestion and balance the
traffic load for each cell so as to improve network performance. It
works only in the same BSC or in cells of the same layer. It is
used only for TCH.
Value range:
Yes, No
Unit
-
Default:
Yes
Note:
Extra interference might be resulted from tight frequency reuse.
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MS fast moving HO allowed
Description:
The fast moving algorithm is a special algorithm to process fast
moving MS. This parameter is used to decide whether to use this
algorithm.
Value range:
Yes, No
Unit
-
Default:
No
Rx_Level_Drop HO allowed
Description:
The parameter decides whether to use the emergency handover
algorithm when receiving level drops fast.
Value range:
Yes, No
Unit
-
Default:
No
Note:
Generally, this parameter is set to “ No” .
This algorithm requires that BTS must send the original MR to
BSC.
PBGT HO allowed
Description:
Indicates whether to use the PBGT handover algorithm. PBGT is
a handover algorithm based on path loss. To avoid Ping-Pong
handover, PBGT handover occurs only between cells of the
same layer.
Value range:
Yes, No
Unit
-
Default:
Yes
MS power prediction after HO
Description:
Indicates whether MS is allowed to use optimized power instead
of the maximum power to access new channel during handover.
If this parameter is set to “ Yes” , this can reduce system
interference and improve service quality.
Value range:
Yes, No
Unit
-
Default:
No
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MR. Pre-process
Description:
Indicates whether BTS pre-processes MR. If this parameter is set
to "No", it means that MR is processed by BSC. In this case, the
parameter Transfer original MR. and Transfer BS/MS Power
Class are invalid. If this parameter is set to "Yes", this will
reduces the load of Abis interface signaling and also the load of
BSC. It also improves response time and network performance.
Meanwhile, this parameter determines the place where to
perform power control. If this parameter is set to “ Yes” , then the
power control will be performed by BTS. Otherwise, the power
control will be performed by BSC.
Value range:
Yes, No
Unit
-
Default:
No
Note:
In the case of 15:1 function, this parameter must be set to “ Yes” .
Otherwise, the RSL capability might be insufficient.
When setting this parameter, it should be noted that whether BTS
supports power control.
Transfer original MR.
Description:
Description: Indicates whether to transfer the original MR to BSC
after BTS pre-processes MR. When the parameter is set to
"Yes", BTS transfer to BSC not only the processed MRs, but also
the original MRs.
Value range:
Yes, No
Unit
-
Default:
No
Note:
In the case of 15:1 function, if the number of SDCCH/8s should
be greater than or equal to 2, this parameter should be set to
“ No” .
Transfer BS/MS power class
Description:
Indicates whether to transfer the original BS/MS power class to
BSC. If the parameter is set to "No", BTS will not report BS/MS
power class to BSC. This will affect the result of uplink and
downlink balance measurement.
Value range:
Yes, No
Unit
-
Default:
Yes
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Sent Freq.of preprocessed MR.
Description:
Indicates the period of BTS to transfer preprocessed MR to BSC.
Value range:
Do not report, Twice every second, Once every second, Once
every 2 seconds, Once every 4 seconds
Unit
-
Default:
Twice every second
Note:
In the case of 15:1 function, it is recommended to set this
parameter to “ Once every second” .
2.4.2 [Cell Description Table]
Layer of the cell
Description:
The whole network can be divided into 4 layers: Umbrella, Mac ro,
Micro, and Pico. Each layer can be set with 16 priorities. This
meets the requirements of various complex networking
environments. Generally, the Macro layer is used for main 900,
Micro for main 1800, and Pico layer for 900 and 1800 microcell.
The smaller the layer value, the higher the priority.
Value range:
1~4, which are respectively corresponding to the PICO layer,
MICRO layer, MACRO layer, and UMBRELLA layer
Unit
Layer
Default:
3
Cell priority
Description:
See the description of the parameter Layer of the Cell. This
parameter is used to set the handover priority of the cells in the
same layer. Generally, the priority of the cells in the same layer
should be the same. For the cells on the same layer, the smaller
the priority value, the higher the priority.
Value range:
1~16
Unit
grade
Default:
1
Inter-layer HO Thrsh.
Description:
The threshold for inter-layer Hierarchical Handover. This
threshold should satisfy the following requirement: Inter-layer HO
Thrsh. ≥ Edge HO RX_LEV Thrsh. + Inter-cell HO hysteresis.
Value range:
0~63. (-110dBm~-47dBm)
Unit
Grade
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Default:
25
Inter-layer HO hysteresis
Description:
Indicates the hysteresis for inter-layer or inter-priority handover. It
is used to avoid inter-layer Ping-Pong handover. Actual
Inter-layer HO Thrsh. of serving cell = value of Inter-layer HO
Thrsh. - Inter-layer HO hysteresis. Actual Inter-layer HO Thrsh. of
adjacent cell = value of Inter-layer HO Thrsh. + Inter-layer HO
hysteresis.
Value range:
0~63
Unit
dB
Default:
3
Penalty on fast moving HO
Description:
When MS is moving fast in Umbrella layer, the penalty will be
given to other adjacent cells in other layers. This parameter
determines the penalty level value. This parameter is valid only
for the duration of “ Penalty Time on Fast Moving HO”
Value range:
0~63
Unit
dB
Default:
30
Penalty time on fast moving HO
Description:
The duration of penalty given to the adjacent cells when MS is in
fast moving state.
Value range:
0~255
Unit
Second
Default:
40
Min DL level on candidate cell
Description:
The minimum downlink receiving level required for all candidate
cells.
Value range: 0~63. (-110dBm~-47dBm).
Value range:
0~63. (-110dBm~-47dBm).
Unit
grade
Default:
15
Note:
This parameter can affect the handover success rate.
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MS_TXPWR_MAX_CCH
Description:
The maximum MS transmitting power level during handover
access.
This parameter is mainly used for the judgment of the M criterion
for MS in the dedicated mode. The M criterion determines
whether an adjacent cell of MS can become a candidate cell. Its
judgment is similar to the C1 criterion for cell selection. M="MS
receiving level" - "Min DL level on candidate cell " MAX(("MS_TXPWR_MAX_CCH" - "Min Access Level Offset"), 0)
- "minimum access level offset". Only when M≥ 0 can the
adjacent cell become a candidate cell.
Value range:
0~31
Unit
-
Default:
5(900M), 0(1800M)
Note:
It is recommended the power levels of cells in GSM900 and
GSM1800 corresponding to different dBm values. The 32
maximum transmitting power levels for GSM900 are:
{39, 39, 39, 37, 35, 33, 31, 29, 27, 25, 23, 21, 19, 17, 15, 13, 11,
9, 7, 5, 5, 5, 5, 5, 5, 5, 5, 5,5, 5, 5, 5}
The 32 maximum transmitting power levels for GSM1800 are:
{30,28, 26, 24, 22, 20, 18, 16, 14, 12, 10, 8, 6, 4, 2, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 36, 34, 32}
UL expected level at HO access
Description:
Indicates the expected uplink receiving level on a target channel
when MS hands over. The value of this parameter should be
consistent with the "Stable RX_LEV Expected" in conjunction
with the power control algorithm and the "UL RX_LEV upper
Thrsh." in conjunction with the HW II power control algorithm.
Value range:
0~63. (-110dBm~-47dBm)
Unit
grade
Default:
35
Cell type
Description:
Whether it is IUO cell.
Value range:
Normal cell, concentric cell
Unit
-
Default:
Normal cell
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2.4.3 [External Cell Description Table]
See the [Cell Description Table].
2.4.4 [Adjacent Cell Relation Table]
Ncell ID
Description:
The index number of an adjacent cell.
Value range:
0~255 for internal cells, and 0~799 for external cells.
Unit
-
Default:
-
PBGT HO Thrsh.
Description:
A threshold in PBGT handover algorithm used to judge whether
to perform PBGT handover. When “ PBGT Handover Allowed” is
set to “ Yes” and "Inter-cell HO hysteresis"> "PBGT HO Thrsh.” ,
the "Inter-cell HO hysteresis" will act instead of the "PBGT HO
Thrsh."
Value range:
0~127, corresponding to -64~63dB
Unit
-
Default:
68 for popular urban areas, 72 for suburbs.
Inter-cell HO hysteresis
Description:
Indicates the handover hysteresis between adjacent cells of the
same layer. The purpose of setting this parameter is to reduce
the “ Ping-Pong” handovers. The value of this parameter is invalid
if cells are not on the same layer.
Value range:
0~63
Unit
dB
Default:
4 dB populous urban areas and 8 dB for suburbs.
Min access level offset
Description:
This offset is based on the "Min DL level on Candidate Cell". For
different adjacent cells, different offsets can be defined. Only
when the receiving level of an adjacent cell ≥ "Min DL Level on
Candidate Cell" + this offset then this cell become a candidate
cell.
Value range:
0~63
Unit
dB
Default:
0
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2.4.5 [Filter data table]
Allowed MR number lost
Description:
Indicates the number of MRs allowed losing during interpolation
processing. If the number of MRs lost continuously is less than
this value, the last MR received before the lost MRs and the next
to the lost MRs will be averaged. The averaged value is regarded
as the lost MR. Otherwise, all previous MRs are discarded, and
calculations are made again when new MRs are received.
Value range:
0~32
Unit
Number of MRs
Default:
4
Filter length for TCH level
Description:
Indicates the number of MRs to be used to do TCH signal
strength averaging calculation. When the filtering window is set
to be too large, the impact of sudden change will be reduced, as
well as the response speed for this kind of sudden change will be
slower.
Value range:
1~32
Unit
-
Default:
6
Filter length for TCH Qual.
Description:
Indicates the number of MRs to be used to do TCH signal quality
averaging calculation. When the filtering window is set to be too
large, the impact of sudden change will be reduced, as well as
the response speed for this kind of sudden change will be slower.
Value range:
1~32
Unit
-
Default:
6
Filter length for SD level
Description:
Indicates the number of MRs to be used to do SDCCH signal
strength averaging calculation. The SDCCH occupation time by
MS is shorter than the TCH occupation time. So the value of this
parameter should be less than that of “ Filter Length for TCH
Level” .
Value range:
1~32
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Unit
-
Default:
3
Filter length for SD Qual
Description:
Indicates the number of MRs to be used to do SDCCH signal
quality averaging calculation. The SDCCH occupation time by
MS is shorter than the TCH occupation time, so the value of this
parameter should be less than that of “ Filter Length for TCH
Qual.”
Value range:
1~32
Unit
-
Default:
3
Filter length for Ncell RX_LEV
Description:
Indicates the number of MRs to be used to do neighboring cells
signal strength averaging calculation. When the filter window is
set to be too large, the impact of sudden change will be reduced,
as well as the response speed for this kind of sudden change will
be slower.
Value range:
1~32
Unit
-
Default:
6
Filter length for TA
Description:
Indicates the number of MRs to be used to do TA averaging
calculation
Value range:
1~32
Unit
-
Default:
6
2.4.6 [Penalty Table]
Penalty level after HO fail.
Description:
After the handover fails due to target cell congestion and other
reasons, a penalty will be given to this cell in order to avoid retry
to hand over to this cell. This parameter is the penalty of signal
level to be given. This penalty is valid only during the duration of
“ Penalty time after HO fail” .
Value range:
0~63
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Unit
dB
Default:
30
Penalty time after HO fail
Description:
See the description of “ Penalty level after HO fail” . This
parameter indicates the duration for penalty.
Value range:
0~60
Unit
second
Default:
10
Penalty level after BQ HO Fail.
Description:
When the emergency handover to a cell and the emergency
handover fails; in order to avoid handing over back to this cell
and "Ping-Pong" handover, a signal level penalty will be given to
this cell. This parameter is the penalty of signal level to be given.
This penalty is valid only during the duration of “ Penalty time after
BQ HO Fail.” .
Value range:
0~63
Unit
dB
Default:
63
Penalty time after BQ HO Fail.
Description:
See the description of “ Penalty level after BQ HO Fail. ” . This
parameter indicates the duration for penalty.
Value range:
0~60
Unit
second
Default:
10
Penalty time after TA HO Fail
Description:
When the emergency handover due to too great TA value in a
cell and the emergency handover fails; In order to avoid handing
over back to this cell and "Ping-Pong" handover, a signal level
penalty will be given to this cell. This parameter is the penalty of
signal level to be given. This penalty is valid only during the
duration of “ Penalty time after TA HO Fail”
Value range:
0~63
Unit
dB
Default:
63
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Penalty time after TA HO Fail.
Description:
See the description of “ Penalty level after TA HO Fail. ” . This
parameter indicates the duration for penalty.
Value range:
0~60
Unit
second
Default:
10
Penalty time after IUO HO Fail.
Description:
After an IUO handover failure, regardless of handover from
UnderLaid subcell to OverLaid subcell or from OverLaid subcell
to UnderLaid subcell, IUO handover will be forbidden within a
period of time. This parameter indicates this duration.
Value range:
0~16
Unit
second
Default:
10
2.4.7 [Emergency Handover Table]
Note:
To speed up the system response in HW_II handover algorithm,
the target cell for emergency handover is selected only according
to the cell sorting, regardless of P/N.
TA Thrsh.
Description:
Emergency handover is triggered once TA is greater than this
value.
Value range:
0~255
Unit
bit period
Default:
63(Normal cell), 219(Dual timeslot extension cell)
DL Qual. Thrsh.
Description:
Indicates the downlink receiving quality threshold in order to
trigger emergency handover due to the bad quality. When
frequency hopping or DTX is used, it is recommended to set the
value of this parameter to 70. When an emergency handover is
triggered, the first-choice target cell is other cell. Only when there
is no other cell serving as candidate cell and the “ Intra-cell HO
allowed” is “ Yes” will the intra-cell handover be triggered.
Value range:
0~70, corresponding to RQ (quality level 0~7) ×10
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Unit
-
Default:
60
UL Qual. Thrsh.
Description:
Indicates the uplink receiving quality threshold in order to trigger
emergency handover due to the bad quality. When frequency
hopping or DTX is used, it is recommended to set the value of
this parameter to 70. When an emergency handover is triggered,
the first-choice target cell is other cell. Only when there is no
other cell serving as candidate cell and the “ Intra-cell HO
allowed” is “ Yes” will the intra-cell handover be triggered.
Value range:
0~70, corresponding to RQ (quality level 0~7) ×10
Unit
-
Default:
60
UL Qual. Thrsh. for interf. HO
Description:
Indicates the uplink receiving quality threshold in order to trigger
emergency handover due to interference. When frequency
hopping or DTX is used, it is recommended to set the value of
this parameter to 60. When an emergency handover is triggered,
the first-choice target cell is other cell. Only when there is no
other cell serving as candidate cell and the “ Intra-cell HO
allowed” is “ Yes” will the intra-cell handover be triggered.
Value range:
0~70, corresponding to RQ (quality level 0~7)×10
Unit
-
Default:
50
DL Qual. Thrsh. for interf. HO
Description:
Indicates the downlink receiving quality threshold in order to
trigger emergency handover due to interference. When frequency
hopping or DTX is used, it is recommended to set the value of
this parameter to 60. When an emergency handover is triggered,
the first-choice target cell is other cell. Only when there is no
other cell serving as candidate cell and the “ Intra-cell HO
allowed” is “ Yes” will the intra-cell handover be triggered.
Value range:
0~70, corresponding to RQ (quality level 0~7)×10
Unit
-
Default:
50
Note:
The follows should be satisfied:
DL Qual. Thrsh.> DL Qual. Thrsh. for interf. HO and UL Qual.
Thrsh.> UL Qual. Thrsh. for interf. HO
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UL RX_LEV Thrsh. for interf. HO
Description:
Only when the RX_Quality is very bad and the RX_Level exceed
a certain threshold will the system regard there is interference.
This parameter indicates that the threshold for uplink RX_Level.
When an emergency handover is triggered, the first-choice target
cell is other cell. Only when there is no other cell serving as
candidate cell and the “ Intra-cell HO allowed” is “ Yes” will the
intra-cell handover be triggered.
Value range:
0~63. (-110dBm~-47dBm)
Unit
grade
Default:
25
DL RX_LEV Thrsh. for interf. HO
Description:
Only when the RX_Quality is very bad and the RX_Level exceed
a certain threshold will the system regard there is interference.
This parameter indicates the threshold for downlink RX_Level.
When an emergency handover is triggered, the first-choice target
cell is other cell. Only when there is no other cell serving as
candidate cell and the “ Intra-cell HO allowed” is “ Yes” will the
intra-cell handover be triggered.
Value range:
0~63. (-110dBm~-47dBm)
Unit
grade
Default:
30
Uplink level SHTM filter length
Description:
This parameter defines the uplink level filter length in short term.
Value range:
0~20
Unit
-
Default:
3
Filter parameters A1~A8
Description:
Parameters for level fast drop filter, totally 9 parameters,
including the filter parameter B. The actual values of
A1~A8=(A1~A8)-10. The actual parameter B value = minus value
of the B value is set. Their working formula is as follows:
C1 (nt)=A1%C(nt)+A2%C(nt-t)+A3%C(nt-2t)+…+A8%C(nt-7t),
where:
C (nt) is the uplink RX_Level of the serving cell in the MR
received at the time of “ nt” .
If C1 (nt)<B, and C(nt) is below the “ Edge HO RX_LEV Thrsh.” ,
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then the signal level is regarded to be fast deteriorating.
Value range:
0~20
Unit
-
Default:
10
Filter parameter B
Description:
Used for the fast drop filter. See the following table for reference
about the relation between quality class and BER.
Quality class
BER
0
Less than 0. 2%
1
0.2% to 0.4%
2
0.4% to 0.8%
3
0.8% to 1.6%
4
1.6% to 3.2%
5
3.2% to 6.4%
6
6.4% to 12.8%
7
Greater than 12.8%
Value range:
0~255
Unit
-
Default:
0
MIN TA
Description:
In a single timeslot extended cell, MS can hand over from
UnderLaid subcell to OverLaid subcell only when its TA is less
than a certain threshold. This parameter indicates this threshold.
Value range:
0~63
Unit
bit period
Default:
0
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2.4.8 [Load Handover Table]
System flux Thrsh. for load HO
Description:
The load handover occurs only when the system load is lower
than a certain threshold. This parameter indicates the threshold.
The value of this parameter cannot be too great.-Unexpected
consequence might –occur when the system load is very high.
The value of this parameter corresponds to TCH occupancy
percentage.
Value range:
0, 8~11; its corresponding percentage values: 0, 70, 80, 90, 95
Unit
%
Default:
10
Load HO Thrsh.
Description:
The load handover will be triggered when the load of a cell
exceeds “ Load HO Thrsh.” . The value of this parameter
corresponds to TCH occupancy percentage.
Value range:
0~7. Its corresponding percentage values: 0, 50, 60, 70, 75, 80,
85, 90
Unit
%
Default:
5
Load Req. on candidate cell
Description:
The target cell is able to receive the handovers from other cells
only when the load of the target cell is lower than “ Load Req. on
candidate cell” . Otherwise, this cell refuses any handover request
from other cells.
Value range:
0~7. Its corresponding percentage values: 0, 50, 60, 70, 75, 80,
85. 90
Unit
%
Default:
2
Load HO bandwidth
Description:
This parameter works together with other parameters to
determine whether the handover is allowed. Only when the
RX_Level of the serving cell is within the range of {Edge HO
RX_LEV Thrsh., Edge HO RX_LEV Thrsh. + Load HO
bandwidth} then the handover will be allowed.
Value range:
0~63
Unit
dB
Default:
25
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Load HO step period
Description:
When a cell is qualified for handover, handover requests might
be sent for all connections simultaneously. It will cause a sudden
increase of CPU load and call-drop due to the congestion of the
target cell. Therefore, these requests will be divided into bands
based on the receiving strength. For example, band1 is within the
range {Edge HO RX_LEV Thrsh., Edge HO RX_LEV Thrsh. +
Load HO step period}; band2 is within the range {Edge HO
RX_LEV Thrsh. + Load HO step period, Edge HO RX_LEV
Thrsh. + 2 × Load HO step period}, and so on. Handovers are
performed band by band from the edge to the inner.
Value range:
1~60
Unit
Second
Default:
10
Load HO step level
Description:
This parameter indicates the interval between two different
handover bands. See the description of “ HO step level” .
Value range:
1~60
Unit
dB
Default:
5
2.4.9 [Normal Handover Data Table]
Edge HO UL RX_LEV Thrsh.
Description:
Edge handover uplink receiving level threshold. The edge
handover will be triggered if the uplink receiving level is
constantly lower than “ Edge HO UL RX_LEV Thrsh.” within a
period of time. If “ PBGT HO allowed” is set to “ Yes” , the
corresponding edge handover threshold will be lowered. In the
case that “ PBGT HO allowed” is set to “ No” , too low value of the
Edge HO UL RX_LEV Thrsh is likely to cause overlapping
coverage and co-channel interference.
Value range:
0~63. (-110dBm~-47dBm)
Unit
grade
Default:
25 for urban areas without PBGT handover being enabled,
urban)
20 for remote suburbs
20 for urban areas with PBGT handover being enabled
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Edge HO DL RX_LEV Thrsh
Description:
Edge handover downlink receiving level threshold. The edge
handover will be triggered if the downlink receiving level is
constantly lower than “ Edge HO DL RX_LEV Thrsh.” within a
period of time. If “ PBGT HO allowed” is set to “ Yes” , the
corresponding edge handover threshold will be lowered. In the
case that “ PBGT HO allowed” is set to “ No” , too low value of the
Edge HO DL RX_LEV Thrsh. is likely to cause overlapping
coverage and co-channel interference.
Value range:
0~63. (-110dBm~-47dBm)
Unit
grade
Default:
30 for urban areas without PBGT handover being enabled
25 for remote suburbs
25 for urban areas with PBGT handover being enabled
Note:
Edge HO UL RX_LEV Thrsh. (Edge HO DL RX_LEV Thrsh.) >
DL RX_LEV upper Thrsh. (DL RX_LEV lower Thrsh.)
Edge HO watch time
Description:
The uplink and downlink receiving level s are measured within
“ Edge HO watch time” so as to determine whether the edge
handover is triggered.
Value range:
1~16
Unit
second
Default:
5
Edge HO valid time
Description:
To trigger an edge handover, the receiving level of the uplink or
downlink should constantly remain lower than their corresponding
edge handover thresholds -y within a period of time. This
parameter indicates this duration.
Value range:
1~16
Unit
Second
Default:
4
PBGT watch time
Description:
The path losses of adjacent cells and the serving cell are
compared with “ PBGT watch time” so as to determine whether
the PBGT handover is triggered.
Value range:
1~16
Unit
second
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Default:
5
PBGT valid time
Description:
The PBGT handover will be triggered when the path loss of
adjacent cells – the path loss of the serving cell > PBGT HO
Thrsh. lasts “ PBGT valid time” .
Value range:
1~16
Unit
second
Default:
4
Layer HO watch time
Description:
See the description of “ PBGT watch time” . This parameter is
used for inter-layer handover decision.
Value range:
1~16
Unit
Second
Default:
5
Layer HO valid time
Description:
See the description of “ PBGT valid time” . This parameter is used
for inter-layer handover decision.
Value range:
0~16
Unit
second
Default:
4
2.4.10 [MS Fast Moving HO Data Table]
MS Fast-moving Watch cells
Description:
The number of cells used to judge whether an MS is in fast
moving state. Too great the value of this parameter will increase
the system load and too small the value will cause inaccurate
judgement.
Value range:
1~10
Unit
-
Default:
3
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MS Fast-moving Valid cells
Description:
This parameter works together with “ MS Fast-moving Watch
cells” . When an MS has achieved the value set in
“ MS
Fast-moving Watch cells” , and if there are “ MS Fast-moving
Valid cells” that are crossed fast. In this case, fast moving
handover will be triggered.
Value range:
1~10
Unit
-
Default:
2
MS Fast-moving time Thrsh.
Description:
If the time of an MS spent on crossing a cell is lower than “ MS
Fast-moving time Thrsh. “ , the MS will be regarded as moving
fast.
Value range:
0~255
Unit
second
Default:
15
2.4.11 [Intra-cell Handover Data Table]
MAX consecutive HO times
Description:
If the interval of two continuous intra-cell handovers is less than
“ Interval for consecutive HO Jud.” these two handovers will be
regarded as consecutive intra-cell handovers. If the number of
consecutive intra-cell handovers exceeds “ MAX consecutive HO
times” , intra-cell handover will be forbidden within “ Forbidden
time after MAX times”
Value range:
1~20
Unit
-
Default:
3
Forbidden time after MAX times
Description:
See the description of “ MAX consecutive HO times” .
Value range:
1~200
Unit
second
Default:
20
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Interval for consecutive HO Jud.
Description:
See the description of “ MAX consecutive HO times” .
Value range:
1~200
Unit
second
Default:
6
2.4.12 [GSM0508 Handover Table]
The GSM0508 handover algorithm is not recommended, and this table is unnecessary
to configure.
2.4.13 [HW-IUO Handover Table]
UO signal intensity difference
Description:
Used to compensate the intensity difference between OverLaid
subcell and UnderLaid subcell.
Value range:
0~63
Unit
dB
Default:
-
RX-LEV Thrsh.
Description:
RX-LEV Thrsh. works together with RX-LEV Hysteresis, TA
Thrsh. and TA hysteresis. This is to determine the boundary
between OverLaid subcell and UnderLaid subcell. The value of
this parameter must be greater than the “ Edge HO Thrsh” . It is
recommended that RX-LEV Thrsh. > Edge HO Thrsh. + UO
Signal Intensity Difference.
Value range:
0~63. (-110dBm~-47dBm)
Unit
grade
Default:
25
RX-LEV Hysteresis
Description:
RX-LEV Hysteresis works together with RX-LEV Thrsh., TA
Thrsh. and TA hysteresis. This is to determine the boundary
between OverLaid subcell and UnderLaid subcell.
Value range:
0~63
Unit
dB
Default:
3
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TA Thrsh.
Description:
TA Thrsh. works together with RX-LEV Thrsh., RX-LEV
Hysteresis, and TA hysteresis. This is to determine the boundary
between OverLaid subcell and UnderLaid subcell. The value of
this parameter must be greater than TA Thrsh.
Value range:
0~63
Unit
bit period. 1 bit period corresponds to 0.55km
Default:
-
TA hysteresis
Description:
TA hysteresis works together with RX-LEV Thrsh., RX-LEV
Hysteresis, and TA Thrsh. This is to determine the boundary
between OverLaid subcell and UnderLaid subcell.
Value range:
0~63
Unit
bit period, 1 bit period corresponding to 0.55km
Default:
-
Note:
The above 4 parameters determine the coverage range of
OverLaid subcell and UnderLaid subcell.
OverLaid subcell coverage range can be indicated as follows:
Receiving level >= RX-LEV Thrsh. + RX-LEV Hysteresis; TA <=
TA Thrsh.- TA hysteresis
UnderLaid subcell coverage range can be indicated as follows:
Receiving level <= RX-LEV Thrsh. - RX-LEV Hysteresis; -TA >=
TA Thrsh. + TA hysteresis
There is a hysteresis band between OverLaid subcell and
UnderLaid subcell which is used to avoid “ Ping-Pong” handovers
(as shown below).
RX-LEV Thrsh. - RX-LEV Hysteresis <= Receiving level <=
RX-LEV Thrsh. + RX-LEV Hysteresis and TA Thrsh. - TA
hysteresis <= TA <=TA Thrsh. + TA hysteresis
If the TA Thrsh. is 63, and the TA Hysteresis is 0, then the
boundary of the OverLaid subcell is completely determined by
the receiving level parameters.
If the RX-LEV Thrsh. is 63, and the RX-LEV Hysteresis is 0,then
the boundary of the UnderLaid subcell is completely determined
by the TA parameters.
UO HO watch time
Description:
See the description of “ PBGT watch time” . This parameter is
used for IUO handover” decision.
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Value range:
0~16
Unit
second
Default:
5
UO HO valid time
Description:
See the description of “ PBGT valid time” . This parameter is used
for IUO handover decision.
Value range:
0~16
Unit
second
Default:
4
Assign optimum layer
Description:
In the IUO cell, System optimization mode indicate the system
selects the optimum layer for TCH assignment as according to
MRs provided through the UL’ s SDCCH
Value range:
System optimization, UnderLaid subcell, OverLaid subcell, No
preference
Unit
-
Default:
System optimization
Assign-optimum-level thrsh.
Description:
After selection of optimal layer, the current SDCCH level value
can be estimated (inserted/ filtered) with the uplink measured
value in the previous SDCCH MR. Furthermore, comparison can
be made with "assign optimal level threshold" in order to assign
the external circle or internal circle channels.
Value range:
0~63,(-110dBm~-47dBm)
Unit
dBm
Default:
-
Note:
If SDCCH is on an external circle: this thrsh. = edge handover
threshold +internal/external circle signal strength difference +
balanced uplink/downlink margin + SDCCH and TCH differential
margin. If SDCCH is on an internal circle: this thrsh. (Temporarily
set as 25 ) = edge handover threshold + uplink/downlink
balanced margin + SDCCH and TCH differential margin.
Pref. subcell in HO of intra-BSC
Description:
The incoming HO intra-BSC optimum algorithm allowed. When
a cell is configured as an IUO cell, the two processing methods of
incoming intra-BSC handover request in BSC are
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1) No preference
2) Add the receiving level of the target IUO cell with the handover
request. Then the target cell compares the receiving level with
RX_LEV Thrsh. to select the optimum layer, regardless of the
RX_LEV Hysteresis.
Value range:
System Optimization, OverLaid Subcell, UnderLaid Subcell, No
Preference
Unit
-
Default:
UnderLaid subcell
Note:
This parameter is used after BSC V04.1120.
IntraBSC inc-cell HO Pref. Alg.
Description:
Value range:
Yes, No
Unit
-
Default:
Yes
Incoming-to-BSC HO optimum layer
Description:
Generally, the inter-BSC handover is triggered at the edge of a
cell. In this case, the UnderLaid subcell can be selected
preferably. In the case of 1800 and 900 that share the same
site location, the inter-BSC handover is hardly triggered at the
edge of a cell. The OverLaid subcell can be selected preferably.
If the handover success rate is low, it is recommended that the
UnderLaid subcell should be selected preferably.
Value range:
UnderLaid subcell, OverLaid subcell, No preference
Unit
-
Default:
UnderLaid subcell
Note:
BCCH carrier must be configured as UnderLaid subcell.
1) The carrier with SDCCH must be configured as UnderLaid
subcell.
2) The handover between OverLaid and UnderLaid subcells will
be forbidden If both RX-LEV Thrsh. and RX-LEV Hysteresis are
63.
3) The handover between OverLaid and UnderLaid subcells will
be forbidden If both TA Thrsh. and TA Hysteresis are 63.
4) The dual timeslot extended cell adopts IUO for data
configuration. See the reference for dual timeslot extended cell.
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2.5 Power control
2.5.1 [Power Control Selection Table]
PC algorithm
Description:
Power control algorithm to be selected.
Value range:
HW_1. HW_2
Unit
-
Default:
HW_2
UL PC allowed
Description:
Whether the MS power adjustment is allowed.
Value range:
Yes, No
Unit
-
Default:
Yes
DL PC allowed
Description:
Whether the BTS power adjustment is allowed.
Value range:
Yes, No
Unit
-
Default:
Yes
2.5.2 [Ordinary Cell PC Table]
RX_LEV Thrsh. for UL increase
Description:
Indicates that when the receiving signal level of an uplink is less
than the set value of this parameter, the power output of MS
should be increased.
Value range:
0~63. (-110dBm~-47dBm)
Unit
Grade
Default:
20
RX_LEV Thrsh. for DL increase
Description:
Indicates that when the receiving signal level of a downlink is less
than the set value of this parameter, the power output of BTS
should be increased.
Value range:
0~63. (-110dBm~-47dBm)
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Unit
grade
Default:
20
P1
Description:
Statistics of the receiving signal level of uplink or downlink will be
performed during P1 MR period (P1 is the number of MRs), so as
to judge whether adjustment of uplink or downlink power is
needed.
Value range:
1~32
Unit
-
Default:
12
N1
Description:
Among P1 MRs, if the receiving level in N1 MRs is lower than
“ RX_LEV Thrsh. for DL/UL increase” , MS or BTS power output
adjustment is triggered.
Value range:
1~32
Unit
-
Default:
10
RX_LEV Thrsh. for UL decrease
Description:
Indicates that when the receiving signal level of an uplink is
higher than the set value of this parameter, the power output of
MS should be decreased.
Value range:
0~63. (-110dBm~-47dBm)
Unit
grade
Default:
40
RX_LEV Thrsh. for DL decrease
Description:
Indicates that when the receiving signal level of a downlink is
higher than the set value of this parameter, the power output of
BTS should be decrease.
Value range:
0~63. (-110dBm~-47dBm)
Unit
grade
Default:
40
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P2
Description:
Statistics of the receiving signal level of uplink or downlink will be
performed during P2 MR period (P2 is the number of MRs), so as
to judge whether decrement of uplink or downlink power is
needed.
Value range:
1~32
Unit
-
Default:
12
N2
Description:
Among P2 MRs, if the receiving level in N2 MRs is lower than the
“ RX_LEV Thrsh. for DL/UL decrease” , decrement of MS or BTS
power output is triggered.
Value range:
1~32
Unit
-
Default:
10
Qual. Thrsh. for UL increase
Description:
Indicates that when the receiving signal quality of an uplink is
worse than the set value of this parameter, the power output of
MS should be increased.
Value range:
0~7
Unit
Grade
Default:
5
Qual. Thrsh. for DL increase
Description:
Indicates that when the receiving signal quality of a downlink is
worse than the set value of this parameter, the power output of
BTS should be increased.
Value range:
0~7
Unit
grade
Default:
5
P3
Description:
Statistics of the receiving signal quality of uplink or downlink will
be performed during P3 MR period (P3 is the number of MRs), so
as to judge whether increment on uplink or downlink power is
needed.
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Value range:
1~32
Unit
-
Default:
7
N3
Description:
Among P3 MRs, if the receiving level in N3 MRs is worse than
the “ Qual. Thrsh. for DL/UL increase” , increment of MS or BTS
power output is triggered.
Value range:
1~32
Unit
-
Default:
5
Qual. Thrsh. for UL decrease
Description:
Indicates that when the recei ving signal quality of an uplink is
better than the set value of this parameter, the power output of
MS should be decreased.
Value range:
0~7
Unit
grade
Default:
0
Qual. Thrsh. for DL decrease
Description:
Indicates that when the receiving signal quality of a downlink is
better than the set value of this parameter, the power output of
BTS should be decrease.
Value range:
0~7
Unit
grade
Default:
0
P4
Description:
Statistics of the receiving signal quality of uplink or downlink will
be performed during P4 MR period (P4 is the number of MRs), so
as to judge whether decrement of uplink or downlink power is
needed.
Value range:
1~32
Unit
-
Default:
18
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N4
Description:
Among P4 MRs, if the receiving quality in N4 MRs is worse than
the “ Qual. Thrsh. for DL/UL decrease” , decrement of MS or BTS
power output is triggered.
Value range:
1~32
Unit
-
Default:
15
2.5.3 [BTS Power Control Data Table]
Note:
it is the HW I power control algorithm
Power control adjustment period
Description
The minimum time between two continuous power control
commands.
Value range:
1~10
Unit
SACCH period (480ms)
Default:
5
Expected stable downlink signal strength
Description:
It defines the signal strength value expected to obtain at MS in a
stable state. Expected stable downlink signal strength>downlink
edge handover threshold (handover parameter). Otherwise, it will
cause ping-pong handover due to power control.
Value range:
0~63
Unit
grade
Default:
35
Downlink signal strength filter length
Description:
Indicate the number of MRs in which the average of signal
strength of downlink is taken in a stable state before BTS power
adjustment. The purpose of setting this parameter is to remove
influence of mutation factors so that analysis of whether to make
power adjustment is not too partial. When the filtering window is
too long, the influence due to mutation will be weakened, and the
BTS power adjustment is not timely. If the window is too short,
BTS power adjustment will not be accurate enough.
Value range:
1~32
Unit
-
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Default:
5
Downlink path loss compensation factor
Description:
The power adjustment will change as according to the difference
between the actual receiving level and the expected receiving
level. The downlink compensation factor acts as the weight
co-efficient of such adjustment. When the difference is fixed, the
greater the compensation factor, the greater the BTS power
adjustment.
Value range:
0~100
Unit
%
Default:
80
Expected downlink quality
Description:
The expected signal quality received at MS in a stable state,
showing the power adjustment direction.
Value range:
0~7
Unit
grade
Default:
1
Downlink quality filter length
Description:
Indicating the number of MRs in which the average signal
strength of downlink is taken in a stable state before BTS power
adjustment. The purpose of setting this parameter is to remove
influence of mutation factors so that analysis of whether to make
power adjustment is not too partial. When the filtering window is
too long, the infl uence due to mutation will be weakened, thus the
BTS power adjustment is not timely; if the window is too short,
BTS power adjustment will not be accurate enough.
Value range:
1~32
Unit
-
Default:
5
Downlink quality compensating factor
Description:
The power adjustment will change as according to the difference
between the actual downlink quality and the expected downlink
quality. The downlink compensation factor acts as the weight
co-efficient of such adjustment. When the difference is fixed, the
greater the compensation factor, the greater the BTS power
adjustment.
Value range:
0~100
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Unit
%
Default:
20
Minimum base station transmitting power
Description:
Indicating the minimum transmitting power allowed by the base
station. No matter how big is the original base station power and
the how many levels it can be down-tuned, the transmitting
power of the base station cannot be lower than this value.
Value range:
0~36
Unit
dBm
Default:
4
Maximum power control adjustment step-length
Description:
Defining the maximum range of BTS power adjustment each
time.
Value range:
1~16
Unit
grade, 2dB at each level
Default:
8
Maximum base station transmitting power
Description:
Indicating the maximum base station transmitting power which is
related to the setting of power level in the carrier configuration
table. The minimum value of the two is taken as the maximum
base station transmitting power. The power adjustment cannot
exceed this range.
Value range:
1~58
Unit
dBm
Default:
46(macro cell), 36(22C), 39(3001C)
Base station power control level
Description:
Indicating the maximum level the base station dynamic power
can be adjusted
Value range:
1~16. Corresponding to 0dB~30dB
Unit
grade, every level corresponding to 2dB
Default:
16
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2.5.4 [MS power control data table]
Note:
It is a HW I power control algorithm
Registering period
Description:
The minimum time between 2 continuous power control
commands.
Value range:
1~30
Unit
SACCH period (480ms)
Default:
5
Expected initial si gnal strength
Description:
Signal strength expected at the BTS receiver at the initial stage.
The specific value can be determined in reference to the actual
cell planning and the cell geographical environment, Normally, its
value should be greater than the signal strength in a stable state.
Value range:
0~63
Unit
grade
Default:
30
Filter length at the initial adjustment phase
Description:
Indicate the number of MRs in which the average of signal
strength of uplink is taken before MS power adjustment at the
initial stage. The purpose of setting this parameter is to remove
influence of mutation factors so that analysis of whether to make
power adjustment is not too partial. When the filtering window is
too long, the influence due to mutation will be weakened and the
MS power adjustment is not timely. If the window is too short, MS
power adjustment will not be accurate enough. At the initial
stage, the power adjustment of MS depends only on the
receiving signal level but no consideration on receiving signal
quality. To lower MS transmitting power as soon as possible,
normally the value should be less than the filter length at the
stable stage.
Value range:
1~32
Unit
-
Default:
2
Expected stable state signal strength
Description:
Signal strength (normally the signal level at the edge of the
adjusted area) expected at the BTS receiver in the stable state.
The expected stable state signal strength>uplink edge handover
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threshold (handover parameter). Otherwise,
ping-pong handover due to power control.
Value range:
0~63
Unit
grade
Default:
30
it
will
cause
Stable stage signal filter length
Description:
Indicating the number of MRs in which the average of signal
strength of uplink is taken before MS power adjustment at the
stable stage. The purpose of setting this parameter is to remove
influence of mutation factors so that analysis of whether to make
power adjustment is not too partial. When the filtering window is
too long, the influence due to mutation will be weakened and the
MS power adjustment is not timely. If the window is too short,
MS power adjustment will not be accurate enough. At the stable
stage, the power adjustment of MS depends on the receiving
signal level and quality. No matter whether initialization
adjustment is executed, power adjustment in the stable state is
started once the expected stable filter window is full.
Value range:
1~32
Unit
-
Default:
5
Uplink compensation factor
Description:
A parameter required to calculate power adjustment. It indicates
the weighting value of the difference between the actual receiving
level and the expected receiving level on the MS transmitting
power.
Value range:
1~100
Unit
%
Default:
80 Indicate when the difference between the current level and the
ideal level is 5dB, power is adjusted by 4 dB, i.e., 5*80/100)
Expected uplink quality
Description:
Indicate the signal quality received at the BTS receiver in the
expected stable state.
Value range:
0~7
Unit
grade
Default:
1
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Quality filter length at stable stage
Description:
Indicate the number of MRs in which the average of uplink quality
is taken before MS power adjustment in the stable state. The
purpose of setting this parameter is to remove influence of
mutation factors so that analysis of whether to make power
adjustment is not too partial. When the filtering window is too
long, the influence due to mutation will be weakened and the MS
power adjustment is not timely. If the window is too short, MS
power adjustment will not be accurate enough.
Value range:
1~30
Unit
-
Default:
6
Uplink quality compensating factor
Description:
The power adjustment will change as according to the difference
between the actual uplink quality and the expected uplink quality.
The uplink quality compensation factor acts as the weight
co-efficient of such adjustment. When the difference is fixed, the
greater the compensation factor, the greater the BTS power
adjustment.
Value range:
0~100
Unit
%
Default:
20. Indicate the difference between the current quality and the
ideal quality is 1 level, and power is adjusted by 2 dB. I.e.,
1*20/100)*10
Power raising range after handover failure
Description:
Indicate the increased power level when returning to the original
channel after handover failure. This is to avoid call drop and to
increase the chance of the next handover.
Value range:
0~4
Unit
grade, every level corresponding to 2dB
Default:
2
Maximum power control adjusting step-length
Description:
indicating the maximum level by which the MS power can be
dynamically adjusted.
Value range:
1~16
Unit
grade, every level is 2dB
Default:
8
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Note
In Huawei I power control algorithms, the transmitting power to
be adjusted = (expected stable state signal strength - current
actual receiving signal strength) * uplink (downlink) link
compensating factor + (current actual receiving uplink (downlink)
link quality - expected uplink (downlink) link quality) *10* uplink
(downlink) quality compensating factor. The final power
adjustment should not exceed the maximum power control
step-length.
To determine the power level to be adjusted, we should find the
error tolerance table according to the current transmitting power
level. The final power adjustment level is not allowed to exceed
the specified value in the error tolerance table. The error
tolerance tables of 900M and 1800M are as follows:
1800M:
Level
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
Error
tolerance
2 2 2 2 2 2 2 2 2 3 3 3 3 3 4 4 4 2 2 2
900M:
Level
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
Error
tolerance
2 2 2 4 4 4 4 4 4 4 4 4 4 4 4 4 6 6 6 6
2.5.5 [HW II power control data table]
Power control adjustment period
Description:
Specify the minimum time between 2 continuous power control
commands.
Value range:
1~30
Unit
SACCH period (480ms)
Default:
5
Uplink level filter length
Description:
Indicating the number of MRs in which the uplink signal strength
is averaged before MS power adjustment.
Value range:
1~20
Unit
-
Default:
6
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Downlink level filter length
Description:
Indicating the number of MRs in which the downlink signal
strength is averaged before BTS power adjustment.
Value range:
1~20
Unit
-
Default:
6
Uplink quality filter length
Description:
Indicating the number of MRs in which the uplink signal quality is
averaged before MS power adjustment
Value range:
1~20
Unit
-
Default:
6
Downlink quality filter length
Description:
Indicating the number of MRs in which the downlink signal quality
is averaged before MS power adjustment.
Value range:
1~20
Unit
-
Default:
6
Measuring report compensation switch
Description:
After the switch is turned on, the currently received MRs should
be put into the MRs compensation queue. Next, the transmitting
power change information should be recorded according to the
MS and BTS power values in the MRs.
After insertion of
values into the MRs, compensations should be made to the
receiving level values in the history MRs according to the power
change information.
Value range:
Yes, No
Unit
-
Default:
Yes
Number of predicted uplink MRs
Description:
When HW II power control algorithms are adopted, no average
filter values of the history MRs are used for power control
judgment, but rather, prediction functions are added into filter
waves so as to cancel the hysteresis of power adjustment. This
parameter specifies the number of uplink MRs for prediction.
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Value range:
0~3
Unit
number of MRs
Default:
2
Number of predicted downlink MRs
Description:
When HW II power control algorithms are adopted, no average
filter values of the history MRs are used for power control
judgment, but rather, prediction functions are added into filter
waves so as to cancel the hysteresis of power adjustment. This
parameter specifies the number of downlink MRs for prediction.
Value range:
0~3
Unit
number of MRs
Default:
2
Uplink signal strength upper threshold
Description:
During the calculation of power control step (as according to
signal level), signal level has both upper and lower thresholds.
Signals between these two thresholds are not adjusted, and
power control is invoked only when the signal level gets out of
these upper and lower thresholds. The distance between these
two thresholds should not be too large, otherwise, power control
will not be sensitive to the change of receiving level, and the
fluctuation of receiving level will be too large. It should not be too
smaller either, otherwise, power control will be too sensitive to
the change of receiving level , so as to result in power control
oscillation-This parameter specifies the upper threshold of uplink
signals for power control. When the signal level exceeds the
above range, a power increment value (=sum of upper and lower
thresholds/2-receiving level) is calculated.
Value range:
0~63
Unit
Grade
Default:
35
Uplink signal strength lower threshold
Description:
During the calculation of power control step (as according to
signal level), signal level has both upper and lower thresholds.
Signals between these two thresholds are not adjusted, and
power control is invoked only when the signal level gets out of
these upper and lower thresholds. The distance between these
two thresholds should not be too large. Otherwise, power control
will not be sensitive to the change of receiving level, and the
fluctuation of receiving level will be too large. It should not be too
smaller either, otherwise, power control will be too sensitive to
the change of receiving level, so as to result in power control
oscillation. This parameter specifies the lower threshold of
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uplink signals for power control. When the signal level exceeds
the above range, a power decrement value (=sum of upper and
lower thresholds/2-receiving level) is calculated.
Value range:
0~63
Unit
grade
Default:
25
Uplink signal good quality threshold
Description:
During the calculation of power control step (as according to
signal quality), receiving signal quality has both upper and lower
thresholds. Power control is invoked only when the signal quality
gets out of these upper and lower thresholds signal quality. This
parameter specifies the uplink good quality threshold for power
control.
Value range:
0~7
Unit
Grade
Default:
0
Uplink signal bad quality threshold
Description:
During calculation of power control step (as according to signal
quality), receiving signal quality has both upper and lower
thresholds. Power control is invoked only when the signal quality
gets out of these upper and lower thresholds of signal quality.
This parameter specifies the uplink bad quality threshold for
power control.
Value range:
0~7
Unit
grade
Default:
2
Downlink signal strength upper threshold
Description:
During calculation of power control step (as according to signal
level), signal level has both upper and lower thresholds. Signals
between these two thresholds are not adjusted, and power
control is invoked only when the signal level gets out of these
upper and lower thresholds. The space between these two
thresholds should not be too large, otherwise, power control will
not be sensitive to the change of receiving level, and the
fluctuation of receiving level will be too large. It should not be too
small either, otherwise, power control will be too sensitive to the
change of receiving level, so as to result in power control
oscillation-This parameter specifies the upper threshold of
downlink signals level for power control. When the signal level
exceeds the upper range, a power increment value (=sum of
upper and lower thresholds/2-receiving level) is calculated.
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Value range:
0~63
Unit
grade
Default:
40
Downlink signal strength lower threshold
Description:
During calculation of power control step (as according to signal
level), signal level has both upper and lower thresholds. Signals
between these two thresholds are not adjusted, and power
control is invoked only when the signal level gets out of these
upper and lower thresholds. This parameter specifies the lower
threshold of downlink signals for power control. When the signal
level exceeds the lower threshold, a power decrease value
(=receiving level sum of upper and lower threshold/2) is
calculated.
Value range:
0~63
Unit
grade
Default:
30
Downlink signal good quality threshold
Description:
During calculation of power control step (as according to signal
quality), receiving signal quality has both upper and lower
thresholds. Power control is invoked only when the signal quality
gets out of these upper and lower thresholds of signal quality.
This parameter specifies the downlink good quality threshold for
power control
Value range:
0~7
Unit
grade
Default:
0
Downlink signal bad quality threshold
Description:
During calculation of power control step (as according to signal
quality) , receiving signal quality has both upper and lower
thresholds. Power control is invoked only when the signal quality
gets out of these upper and lower thresholds of signal quality.
This parameter specifies the downlink bad quality threshold for
power control.
Value range:
0~7
Unit
grade
Default:
2
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Maximum allowed adjustment step-length in quality band 0
Description:
Huawei II power control algorithm classify receiving signal quality
(RQ value) into three quality bands (0, 1~2, ¦3). In every quality
band, different maximum allowed power adjustment step-length
is set. If the allowed maximum step-length adjustment is set too
small, the algorithm will not reach the purpose of fast power
control; if it is set too large, it will reduce the effectiveness of
power control. This parameter specifies the maximum allowed
power step-length when RQ value is 0.
Value range:
0~30
Unit
dB
Default:
16
Maximum allowed adjustment step-length in quality band 1
Description:
This parameter specifies the maximum
step-length when RQ value is between (0, 1)
allowed
power
Value range:
0~30
Unit
dB
Default:
8
Description:
This parameter specifies the maximum allowed
step-length adjustment when RQ value¦3 during
adjustment according to level.
power
power
Value range:
0~30
Unit
dB
Default:
4
Maximum allowed adjustment step-length in quality band 2
Allowed adjustment step-length for power control according to quality
Description:
Specifying the allowed adjustment step-length during power
control according to receiving signal quality.
Value range:
0~4
Unit
dB
Default:
4
Note
In Huawei II power control algorithm, the power adjustment
request is given according to the receiving signal level and
quality, then the power control adjustment direction and
step-length are obtained by integrating the two as follows:
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Receiving level power Receiving quality power
control adjustment
control adjustment
Level
and
quality
integration power control
adjustment
↓ AdjStep_Lev
↓ AdjStep_Qul
↓
maxAdjStep_Lev,AdjStep
_Qul)
↓ AdjStep_Lev
↑ AdjStep_Qul
No action
↓ AdjStep_Lev
No action
↓ AdjStep_Lev
↑AdjStep_Lev
↓ AdjStep_Qul
↑AdjStep_Lev
↑AdjStep_Lev
↑ AdjStep_Qul
↑
max(AdjStep_Lev,AdjStep
_Qul)
↑AdjStep_Lev
No action
↑AdjStep_Lev
No action
↓ AdjStep_Qul
↓ AdjStep_Qul
No action
↑ AdjStep_Qul
↑ AdjStep_Qul
No action
No action
No action
Minimum allowed power of MS
Description:
The lower limit of MS transmit power when power control is on.
Value range:
0~20
Unit
power level
Default:
19(900M), 15(1800M)
Maximum allowed power of MS
Description:
Indicate the maximum allowed transmit power of MS.
Value range:
0~20
Unit
grade
Default:
5(900M), 0(1800M)
Maximum transmit power of base station
Description:
Indicate the maximum power that can be transmitted by a base
station, which is related to the power level setting in the carrier
configuration table. The minimum value of the two is taken as the
maximum transmit power of the base station. But power
adjustment cannot exceed this range.
Value range:
1~58
Unit
dBm
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Default:
46 (macro cell), 36(BTS22C), 39(BTS3001C)
Level number of base station power control
Description:
this indicates the maximum level number that a base station can
be down-tuned from the static power level.
Value range:
1~16; corresponding to 0dB~30dB
Unit
grade
Default:
16
2.6 Channels
2.6.1 [Radio channel management control table]
Channel distribution algorithm selection
Description:
Specify channel distribution algorithm used in the cell. Huawei I
algorithms distribute channels in sequence; Huawei II algorithms
select priority distributed channels to distribute. To efficiently
distribute channels, "Huawei I algorithms" are recommended; to
distribute optimal channels, "Huawei II algorithms" are
recommended.
Value range:
Huawei I algorithms and Huawei II algorithms
Unit
-
Default:
Huawei I algorithms
Note
in version BSC1120 and subsequent versions, Huawei II
algorithms are recommended.
Interference band pre-processing switch
Description:
It determines whether channel management preprocesses
interference bands.
Value range:
Yes, No
Unit
-
Default:
No
Initial length of interference band filter
Description:
If the local cell starts bad channel management, the configuration
of this data is valid. The initial length of interference band filtering
means the number of radio frequency resources indication
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messages that start to be pre-processed.
Value range:
0~7
Unit
-
Default:
3
Length of averaged interference band
Description:
If the cell starts bad channel management, the configuration of
this data is valid. This parameter refers to the number of radio
frequency resources indication message reports in which the
average of receiving interference band levels is calculated.
Value range:
0~31
Unit
-
Default:
6
The three parameters above are actually not used, and will not
be available starting from version OMC 01.1120A.
Whether SDCCH is dynamically distributed
Description:
whether SDCCH is dynamically distributed
Value range:
Yes, No
Unit
-
Default:
Yes
Note:
In the 0520B version, this function can be set dynamically.
Command word: configure channel management data,
parameter: cell number. For the current 03.0529 base station
version of BTS3X, when SDCCH dynamic distribution is turned
on, assignment failure and single-connection might occur, but
this is already solved in the 05.0529 version of BTS3X.
The host version G3BSC32.10100.07.0520B and subsequent
versions all support force recovery of SDCCH channels. Whether
SDCCH are dynamically distributed is set to "No" at the data
management console, all SDCCH channels adjusted from TCH
are immediately recovered to TCH channels. In this case, all calls
set up on this TCH channel will be lost.
Idle SDCCH channel threshold
Description:
When idle SDCCH channels in the cell are less than or equal to
the set value of this parameter, try to find an available TCH to
convert to SDCCH channels. Initiating the conversion flow from
TCH to SDCCH needs two extra conditions in addition to that idle
SDCCH channels must be less than or equal to N1: the current
idle TCH channels in the cell are more than 4 or more than the
number of TRXs; and the number of current SDCCH channels in
the cell is less than the allowed maximum number of Max
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SDCCH.
Value range:
-
Unit
-
Default:
2
Note:
In the 0520B version, this item can be set dynamically.
Command word: configure channel management data,
parameter: cell number.
The maximum number of SDCCH channel in the cell
Description:
The value must be larger than the maximum number of SDCCH
configured in the cell, otherwise, dynamic SDCCH adjustment
cannot occur. In the 0520B version, the item can be set
dynamically. Command word: configure channel management
data, parameter: cell number.
Value range:
specifying the maximum number of SDCCH in the cell.
Unit
-
Default:
Configured SDCCH in the cell + 8 (too big a value will not be
good for system recovery during abnormality)
Note:
1) The process flow of recovering SDCCH into TCH is as follows:
every cell is set with a counter. Each time a TCH channel is
converted into a SDCCH channel, the counter is set as ResTime.
Every 3 seconds, Counter is adjusted once. If the current idle
SDCCH channels > 8 + N1, then Counter is subtracted by 3; if
the current idle SDCCH channels < 8 + N1, then add 12 to the
Counter, but it must not exceed ResTime; if the current idle
SDCCH channels= 8 + N1, then Count remains unchanged.
After the adjustment, if Counter <= 0, then recover one TCH
channel. This is the so-called "bucket" algorithm.
2) Due to TRX hardware process capability restriction, every TRX
can have at most 2 timeslots configured as SDCCH. During
initiating of converting TCH to SDCCH, if there are calls on the
selected TCH channel, the calls are handed over to other idle
TCH channels in the cell. During dynamic SDCCH channel
distribution, each time only one TCH is converted into SDCCH;
when recovering SDCCH into TCH, each time only one TCH
channel is recovered.
During conversion from TCH to SDCCH, TCH channels on TRX
where BCCH are located should not be selected.
TCH Minimum recovery time (second)
Description:
The minimum time during which TCH are converted into SDCCH
and then recovered into TCH.
Value range:
60~3600
Unit
second
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Default:
600
TCH Idle threshold N1
Description:
In the 0520B version, this item can be set dynamically.
Command word: configure channel management data,
parameter: cell number.
Value range:
0~cell TCH timeslot number
Unit
-
Default:
2
TCH decision application period T (minute)
Description:
-
Value range:
0~65535
Unit
minute
Default:
10
Note:
1) The usage of "idle TCH channel threshold N1", "TCH decision
application period T (minute)": is to set parameters for the
opportunity of mutual conversion between TCH and dynamic
PDCH.
2) Dynamic PDCH in default are TCH; dynamic PDCH can be
converted into SDCCH (when they are used as TCH); and
dynamic PDCH can be converted into PDCH (even though they
are used as SDCCH);
3) There are two objectives of dynamic PDCH control. Firstly, to
determine when BSC requests PCU for TCH; to determine
whether BSC refuses PCU channel requests.
A Counter is set in every cell, initialized to 0. Counter range is
-T~T. Counter is adjusted once every minute. If the current idle
TCH channels > N1, then Counter is increased by 1, but it should
not exceed T. If the current idle TCH channels <= N1, Counter is
decreased by 1, but it still should not be less than -T. After
adjustment, if Counter < -T/2, and if available dynamic PDCH
channels are greater than 0, then BSC requests PCU for TCH
channels. When BSC receives channel request messages from
PCU, it checks Counter value, and if Counter < T/2, then BSC
unconditionally refuses PCU channel requests; in contrary, it will
determine the response to PCU according to the PCU
requirements and current channel use.
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2.6.2 [HW II Channel Allocation table]
Note:
To support channel distribution HW II algorithms, the BSC host
software
should
be
upgraded
to
version
G3BSC32.10100.01.1120A and above; LAPD should be
upgraded to version G3LAPV4.0.2000.11.20 and above; and
OMC should also be upgraded to a related version.
SD allocation priority allowed
Description:
If this data is "No", then SDCCH channel distribution adopts the
polling mode; if this data item is "Yes", then SDCCH channel
distribution adopts optimal mechanisms.
Value range:
Yes, No
Unit
-
Default:
Yes
Note:
The parameter can be dynamically set, command word is
"configure channel management data", and the parameter is cell
number
iInterf. priority allowed
Description:
If this data item is "Yes", then the interference priority in channel
priority is valid; otherwise, the interfering priority is invalid.
Value range:
Yes, No
Unit
-
Default:
Yes
Active Ch Inter.Meas. allowed
Description:
If this data item is "No", then decision is made without seizing
channel interference, nor sending interference indication;
otherwise, decision will be made according to the interference
circumstances about the seized channel.
Value range:
Yes, No
Unit
-
Default:
Yes
AllocationTRX priority allowed
Description:
If this data item is "Yes", then the TRX priority in channel priority
is valid; otherwise, the TRX priority is invalid.
Value range:
Yes, No
Unit
-
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Default:
Yes
History records priority allowed
Description:
If this data item is "Yes", then the history record priority in
channel priority is valid; otherwise, the history record priority is
invalid.
Value range:
Yes, No
Unit
-
Default:
Yes
Balancetraffic allowed
Description:
If this data item is "Yes", then the initial value range of random
channel ranging is selected; otherwise, the next channel after the
previously distributed channel is taken as the starting point of
channel range.
Value range:
Yes, No
Unit
_
Default:
Yes
Interf.of UL Level thrsh.
Description:
If uplink level of a channel is greater than this threshold, and if
the uplink channel quality is greater than or equal to the uplink
interference quality threshold, then uplink interference occurs.
Value range:
0~63
Unit
grade
Default:
31
Interf. of UL qual. Thrsh.
Description:
If uplink level of a channel is greater than or equal to the uplink
interference level threshold, and if the uplink channel quality is
greater than or equal to this threshold, then uplink interference
occurs.
Value range:
0~70
Unit
quality grade value
Default:
40
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Interf. of DL Level Thrsh.
Description:
If downl ink level of a channel is greater than or equal to this
threshold, and if the downlink channel quality is greater than or
equal to the downlink interference quality threshold, then
downlink interference occurs
Value range:
0~63
Unit
grade
Default:
31
Interf. of DL Qua. Thrsh.
Description:
If downlink level of a channel is greater than or equal to this
downlink interference level threshold, and if the downlink channel
quality is greater than or equal to this threshold, then downlink
interference occurs.
Value range:
0~70
Unit
quality grade value
Default:
40
Filter length for TCH Level
Description:
To filter the voice /data channel level with this parameter
Value range:
1~32
Unit
-
Default:
6
Filter length for TCH Qual.
Description:
To filter the voice /data channel quality with this parameter
Value range:
1~32
Unit
-
Default:
6
Filter length for SDCCH Level
Description:
To filter the signaling channel level with this parameter
Value range:
1~32
Unit
-
Default:
2
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Filter length for SDCCH Qual.
Description:
To filter the signaling channel quality with this parameter.
Value range:
1~32
Unit
-
Default:
2
Update Period of CH Record
Description:
When the time exceeds the channel history record refreshing
period, the history record refreshing flow is started, i.e., every
time the interval set by this parameter is reached, the history
record of every channel is subtracted by the set value of the
"channel seizure history record refreshing range", so as to
improve channel priority. This parameter together with the
"channel seizure history record refreshing range" acts to prevent
channel inability to distribute after deterioration for a period of
time.
Value range:
1~1,440
Unit
minute
Default:
30
Update Freq. Of CH record
Description:
While refreshing history record priority, if the history record
priority is higher than this range, then refresh related history
record priority.
Value range:
0~63
Unit
-
Default:
2
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Chapter 3 RNP Parameters Form
This form may be used as a data request sheet for the parameter settings in the
BSC. The structure is based on the data management console.
Local-office Data
BSC Cell Data
Module ID:
Cell ID:
Cell Name:
Cell System Type:
Sub-Cell Type
Cell Class
BCC
NCC
CGI
Installation Status
SITE ID
SITE Name
Support GPRS
Frequency Hopping Data
FH Index No.
HSN
TSC
FH ARFCN 01
…
FH ARFCN 64
Radio Channel Config. Table
Module ID
Site ID
TRX ID
CH Number
SITE Name
CH Type
FH Index Number
MAIO
Sub-CH Number
Circuit Number
TS Number
Sub-TS Numbe
Module ID
Cell ID
TRX ID
Cell Name
Equipment group ID
ARFCN 01,…
, ARFCN64
Site
Carrier Configuration
Static TRX Power Class
Carry Power Type
HW-IUO
Property
TRX Priority
Cell
System Information Table
Module ID
Cell ID
Cell Name
System Information
Regular Transmission
Regular Transmission Interval
MS MAX Retrans
Common Access Control Class
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Special Access Control Classl
Cell Channel Description Format
ATT
PWRC
UL DTX
CBA
EC Allowed
Call Re_establishment Allowed
NCC Allowed
BS_AG_BLKS_RES
CCCH_CONF
T3212
Radio Link Timeout
MS_ TXPWR_MAX_CCH
RXLEV_ACCESS_MIN
CRH
PI
CBCH CH Description
TO
TX-integer
BS_PA_MFRAMS
ACS
Half Rate Supported
CBQ
CRO
CBCH Mobile Allocation
PT
ECSC
Power Deviation Indication
MBR
Power Deviation
Cell Configuration Table
Module ID
Cell ID
Cell Name
Speech Version
Encryption Algorithm
Speech Version Priority
Data Service Allowed
BCCH Mutual Support
FH Mode
DL DTX
BCCH Mutual Recover
BBFH TRX Mutual Support
BBFH TRX Mutual Recover
Cell Allocation Table
Module ID
ARFCN 0
Cell ID
…
Cell Name
ARFCN 63
BA1(BCCH) Table
Module ID
Cell ID
Cell Name
BCCH of NCell 1 …BCCH of NCell 32
BA2(SACCH) Table
Module ID
Cell ID
Cell Name
BCCH of NCell 1 …BCCH of NCell 32
Cell Attribute Table
Module ID
Cell ID
Cell Name
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Interf. Band Thrsh. 0
Interf. Band Thrsh. 1
Interf. Band Thrsh. 2
Interf. Band Thrsh. 3
Interf. Band Thrsh. 4
Interf. Band Thrsh. 5
Interf. Calculation Period
SACCH Multi_Frames
Radio Resource Report Period
CCCH Load Indication Period
CCCH Load Thrsh.
Max Resend Times of Phy. Info.
OverLoad Indication Period
RACH Busy Thrsh
Average RACH Load TS Number
Max RC Power Reduction
T200 SDCCH
T200 FaCCH/H
T200 FACCH/F
T200 SACCH TCH SAPI0
T200 SACCH TCH SAPI3
T200 SACCH SDCCH
T200 SDCCH SAPI3
T3105
MAX TA
Frame Start Time
Random Access Error Thrsh.
Power Class
RACH Min. Access Level
DC Bias Voltage Thrsh.
Cell Extension Type
Cell Extension Offset
Paging Times
Diversity LNA Bypass Permitted
Cell Alarm Threshold Table
Module ID
Cell ID
Cell Name
Power Output Error Thrsh.
Power Output Reduction Thrsh.
VSWR TRX Error Thrsh.
VSWR TRX Unadjusted Thrsh.
Cell Call Control Table
Module ID
Cell ID
Cell Name
TCH Immediate Assignment
Immediate Assignment Opt.
Immediate Assign to Other Cell
Assign to Other Cell
TCH Assignment Retry
Intra-Cell SD to TCH HO
Inter-Cell SD to TCH HO
OM Start Intra-Cell HO
OM Start Inter-Cell HO(IntraBSC)
OM Start Inter-BSC HO
TCH Overload Alarm
RF CH Abnormal Release Retry
Abis flow control permitted
TCH Flow Control Allowed
Circuit Pool
Direct Retry
Cell Call Control Para. Table
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Module ID
Cell ID
Cell Name
T3101
Assign_TCH Idle Rate Thrsh.
Assign_TCH re_Estb. Rate Thrsh.
TCH Flow Control Start Thrsh.
Max Assignment Retry Times
Max HO Retry Times
Ilde TCH Thrsh. for SD to TCH HO
Max Radio CH Release Retry Times
Service Type Req.(SD to TCH HO
Out HO Request Resend Interval
Out BSC HO Req. Resent Times
Syst. Delay Frame No.Adjust
Response On Out BSC HO Req.
Handover
Handover Control Data Table
Cell ID
Cell ID
Cell Name
HO Algorithm
Min Interval for TCH HOs
Min Interval for SD HOs
Min Interval for Consecutive HOs
Min Interval for Urgent HOs
Co_BSC/MSC Adj.
MS Fast Moving HO Allowed
SD HO Allowed
Penalty Allowed
Rx_Level_Drop HO Allowed
IntraCell HO Allowed
Load HO Allowed
MS Power Prediction after HO
PBGT HO Allowed
MR. Preprocessing
Transfer BS/MS Power Class
Transfer Original MR.
Sent Freq.of Preprocessed MR.
Cell Description Data Table
Cell ID
Cell ID
Cell Name
BCCH
CGI
NCC
BCC
Layer of Cell
Cell Priority
Cell Type
Inter_Layer HO Thrsh.
Inter_Layer HO Hysteresis
Penalty on MS Fast Moving HO
Penalty Time on Fast Moving HO
MS_TXPWR_MAX_CCH
Min DL Level on Candidate Cell
UL Expected Level at HO Access
External Cell Description Table
External Cell ID
Cell Name
BCCH
CGI
NCC
BCC
Layer of Cell
Co_MSC
Cell Priority
Cell Type
Inter_Layer HO Thrsh.
Inter_Layer HO Hysteresis
Penalty on MS Fast Moving HO
Penalty Time on Fast Moving HO
MS_TXPWR_MAX_CCH
Min DL Level on Candidate Cell
UL Expected Level at HO Access
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Adjacent Cell Relation Table
Module ID
Cell ID
Module ID of Adjacent Cell
NCell ID
Cell Name
PBGT HO Thrsh.
Inter_Cell HO Hysteresis
Min Access Level Offset
Filter Table
Module ID
Cell ID
Cell Name
Allowed M.R. Number Lost
Filter Length for TCH Level
Filter Length for TCH Qual.
Filter Length for SD Level
Filter Length for SD Qual.
Filter Length for NCell RX_LEV
Filter Length for TA
Penalty Table
Module ID
Cell ID
Cell Name
Penalty Level after HO Fail.
Penalty Time after HO Fail.
Penalty Level after BQ HO Fail.
Penalty Time after BQ HO Fail.
Penalty Level after TA HO Fail.
Penalty Time after TA HO Fail.
Penalty Time after IUO HO Fail.
Urgent Handover Table
Module ID
Cell ID
Cell Name
TA Thrsh.
DL Qual. Thrsh.
UL Qual. Thrsh. for Interf.HO
UL Qual. Thrsh.
DL Qual. Thrsh. for Interf.HO
UL RX_LEV Thrsh. for Interf.HO
DL RX_LEV Thrsh. for Interf.HO
Uplink Level SHTM Filter Length
Filter Parameter A1
Filter Parameter A2
Filter Parameter A3
Filter Parameter A4
Filter Parameter A5
Filter Parameter A6
Filter Parameter A7
Filter Parameter A8
Filter Parameter B
MIN TA
Cell ID
Cell Name
Load HO Thrsh.
Load Handover Table
Module ID
Load Req. on Candidate Cell
System Flux Thrsh. for Load HO
Load HO Bandwidth
Load HO Step Level
Load HO Step Period
3-99
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GSM9001800 BSS Network Planning Parameters ReferenceV3.2
Normal Handover Data Table
Module ID
Cell ID
Cell Name
Edge HO UL RX_LEV Thrsh.
Edge HO DL RX_LEV Thrsh.
Edge HO Watch Time
Edge HO Valid Time
Layer HO Watch Time
Layer HO Valid Time
PBGT Watch Time
PBGT Valid Time
Fast Moving HO Data Table
Module ID
Cell ID
MS Fast_Moving Watch Cells
Cell Name
MS Fast_Moving Valid Cells
MS Fast_Moving Time Thrsh.
Intra_Cell Handover Data Table
Module ID
Cell ID
MAX Consecutive HO Times
Cell Name
Forbidden Time after MAX Times
Interval for Consecutive HO Jud.
HW~IUO Handover Table
Module ID
Cell ID
Cell Name
UO Signal Intensity Difference
RX_LEV Thrsh.
TA Thrsh.
RX_LEV Hysteresis
UO HO Watch Time
UO HO Valid Time
TA Hysteresis
Assign Optimum Layer
Assign_Optimum_Level Thrsh.
Incoming_to_BSC HO Optimum Layer
pref. subCell in HO of Intra_BSC
IntraBSC inc-cell HO Pref. Alg.
Power Control Selection Table
Module ID
Cell ID
Cell Name
PC Algorithm
UL PC Allowed
DL PC Allowed
Cell ID
Cell Name
Ordinary Cell PC Table
Module ID
3-100
Data Configuration Manual
GSM9001800 BSS Network Planning Parameters ReferenceV3.2
RX_LEV Thrsh. for UL Increase
RX_LEV Thrsh. for DL Increase
P1
RX_LEV Thrsh. for UL Decrease
N1
RX_LEV Thrsh. for DL Decrease
P2
Qual. Thrsh. for UL Increase
Qual. Thrsh. for DL Increase
P3
Qual. Thrsh. for UL Decrease
N3
Qual. Thrsh. for DL Decrease
P4
N2
N4
PC Period
BTS Power Control Table
Module ID
Cell ID
Cell Name
BTS PC Period
DL RX_LEV Expected
DL RX_LEV Compensation
Filter Length for DL RX_LEV
DL Qual. Expected
Filter Length for DL Qual.
DL Qual. Compensation
BTS Min Tx Power
MAX PC Step
BTS Max Tx Power
PC Adj. Range
MS Power Control Table
Module ID
Cell ID
Cell Name
PC Interval
Initial RX_LEV Expected
Filter Length for Initial RX_LEV
Stable RX_LEV Expected
Filter Length for Stable RX_LEV
UL RX_LEV Compensation
UL Qual. Expected
Filter Length for Qual.
UL Qual. Compensation
Power Increment after HO Fail.
MAX PC Step
HWII Power Control Data Table
Module ID
Cell ID
PC Interval
Filter Length for UL RX_LEV
Filter Length for DL RX_LEV
Filter Length for UL Qual.
Filter Length for DL Qual.
MR. Compensation Allowed
UL MR. Number Predicted
DL MR. Number Predicted
UL RX_LEV Upper Thrsh.
UL RX_LEV Lower Thrsh.
UL Qual. Upper Thrsh.
3-101
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UL Qual. Lower Thrsh.
DL RX_LEV Upper Thrsh.
DL RX_LEV Lower Thrsh.
DL Qual. Upper Thrsh.
DL Qual. Lower Thrsh.
MAX Adj. Value for Qual. Zone 0
MAX Adj. Value for Qual. Zone 1
MAX Adj. Value for Qual. Zone 2
Adj. PC Value by RxQual.
MS Min Allowed Power
BTS Max. Power
BTS PC class
Channel Radio CH management ctrl. Table
Module ID
Cell ID
CH Allocation Algorithm
SD Dynamic Allocation Allowed
Idle SD Thrsh.
Cell SD Maximum
TCH Minimum Recovery Time(s)
Idle TCH Thrsh. N1
Apply_TCH Decision Period T(m)
HWII Channel Allocation Table
Module ID
Cell ID
SD Allocation Priority Allowed
Interf. Priority Allowed
Active CH Interf. Meas.Allowed
Allocation TRX Priority Allowed
History Record Priority Allowed
Balance Traffic Allowed
Interf. of UL Level Thrsh.
Interf. of UL Qual. Thrsh.
Interf. of DL Level Thrsh.
Interf. of DL Qual. Thrsh.
Filter Length for TCH Level
Filter Length for TCHQual.
Filter Length for SDCCH Level
Filter Length for SDCCH Qual.
Updata Period of CH Record
Updata Freq. of CH Record
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GSM9001800 BSS Network Planning Parameters ReferenceV3.2
Chapter 4 BCCH participate in FH Data Config.
4.1 Overview
BCCH participating in FH indicates that all timeslots except timeslot 0 of BCCH TRX
participate in FH. It must be based on Timeslot FH. Two MA should be employed for
BCCH participating in FH. One is used for all timeslots except the timeslot 0 of all TRX,
it contains all frequencies including BCCH frequency. The another is used for the
timeslot 0 of all TRX except BCCH TRX, correspondingly it contains all frequencies
except BCCH frequency.
4.2 Data configuration
Assumption: one cell has three TRX (TRX0, TRX1, and TRX2) with three frequencies
(F1, F2, and F3), BCCH frequency participating in FH is required.
The data configuration is shown as follows:
1. There are two MA, one is MA0 (F1, F2, F3) for all timeslots except the timeslot 0 of all
TRX; The another is MA1 (F2, F3) for the timeslot 0 of all TRX except BCCH TRX.
2. Baseband FH mode should be selected for this cell.
3. The timeslot 0 of BCCH TRX does not participate in FH (The HSN index No. is 0), all
other timeslots participate in FH (The HSN index No. is non-0)
4. The same HSN must be shared for timeslot 0 and the other timeslots participating in
FH
TRX0 channel
configuration
TS0
TS1
TS2
TS3
TS4
TS5
TS6
TS7
TRX1 channel configuration
F2, F3
MAIO=1
F1, F2, F3 HSN=? F1,
F2,
MAIO=0
MAIO=1
F1, F2, F3 HSN=? F1,
F2,
MAIO=0
MAIO=1
F1, F2, F3 HSN=? F1,
F2,
MAIO=0
MAIO=1
F1, F2, F3 HSN=? F1,
F2,
MAIO=0
MAIO=1
F1, F2, F3 HSN=? F1,
F2,
MAIO=0
MAIO=1
F1, F2, F3 HSN=? F1,
F2,
MAIO=0
MAIO=1
F1, F2, F3 HSN=? F1,
F2,
MAIO=0
MAIO=1
HSN=?
F1
F3
F3
F3
F3
F3
F3
F3
4-103
TRX2 channel configuration
F2, F3
MAIO=2
HSN=? F1, F2, F3
MAIO=2
HSN=? F1, F2, F3
MAIO=2
HSN=? F1, F2, F3
MAIO=2
HSN=? F1, F2, F3
MAIO=2
HSN=? F1, F2, F3
MAIO=2
HSN=? F1, F2, F3
MAIO=2
HSN=? F1, F2, F3
MAIO=2
HSN=?
HSN=?
HSN=?
HSN=?
HSN=?
HSN=?
HSN=?
HSN=?
Data Configuration Manual
GSM9001800 BSS Network Planning Parameters ReferenceV3.2
Chapter 5 Contrast table of RNP Parameters
between BSC04.080520 and BSC04.1120
Name of CDD for BSC04080520 version
Name of CDD for BSC041120 version
BSC cell table
Module ID
Cell ID
Cell name
Cell system type
Sub-cell type
Cell level
Cell Class
BS color code
BCC
Network color code
NCC
Reserved
CGI
CGI
Installation state
SITE ID
Site ID
SITE name
Site name
Support GPRS
Frequency hopping table
Frequency hopping index No.
FH index No.
HSN
HSN
TSN
TSC
Hopping Frequency 1~64
FH ARFCN 1~64
Radio channel config. table
Module ID
SITE ID
Site ID
TRX ID
Channel No.
CH Number
SITE name
Site name
Channel type
CH type
Frequency hopping index No.
FH index Number
MAIO
MAIO
Sub-channel No.
Sub-CH Number
Trunk circuit No.
Circuit Number
Timeslot No.
TS Number
Sub-timeslot No.
Sub-TS Number
Carrier configuration table
Module ID
Cell ID
TRX ID
TRX ID
Cell name
Equipment group ID
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Valid carrier frequency 1~64
ARFCN 1~64
Power class
Static TRX Power Class
Carrier power type
Concentric cell property
HW-IUO Property
TRX priority
System information table
Module ID
Cell ID
Cell name
System information use
System information
Reserved
Regular transmission
Regular transmission interval
MS max. resend times
MS MAX retrans
Common access control level
Common Access Control Class
Special access control level
Special Access Control Class
Reserved
Cell channel description format
Attach/detach permitted
ATT
Power control permitted
PWRC
Downlink DTX indication
UL DTX
TX_integer
CBA
Tx integer
CBA
Emergency call permitted
EC allowed
Call re-establishment permitted
Call re-establishment allowed
Reserved
Country color code permitted
NCC permitted
Bs_ag_blks_res
BS_AG_BLKS_RES
CCCH configuration
CCCH-CONF
Bs_pa_mfrms
BS-PA-MFRAMS
T3212
Invalid radio link counter
Radio Link Timeout
MS max. Tx power level
MS_TXPWR_MAX_CCH
Reserved
MS min. Rx signal level
RXLEV_ACCESS_MIN
Reserved
Add reselection para. indication
ACS
Half rate supported
Cell reselection hysteresis
CRH
Reserved
CBCH channel description
CBCH CH Description
CBCH mobile configuration
CBCH Mobile Allocation
Cell reselection parameter indi.
PI
CBQ
CBQ
Cell reselection offset
CRO
Cell reselection temp. offset
TO
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Cell reselection penalty time
PT
ECSC
Power deviation indication
Power deviation
Multiband reporting
MBR
Reserved
Cell configuration table
Module ID
Cell ID
Cell name
Data service configuration
Data service allowed
Reserved 1
Speech version
Reserved 2
Speech version priority
Speech version priority
Encryption algorithm setting
Encryption Algorithm
Cell BCCH switchover permitted
BCCH mutual support
Frequency hopping mode
FH Mode
TCH carrier power
BCCH carrier power
Support DRX mode
SMCBC DRX
Downlink DTX applied
DL DTX
Cell BCCH switchover selection
BCCH mutual recover
Hopping TRX failure SO permitted
BBFH TRX mutual support
Hopping TRX switchback selection
BBFH TRX mutual recover
Cell allocation table
Module ID
Cell ID
Cell name
Valid carrier frequency 0~63
ARFCN 0~63
BA1(BCCH) table
Module ID
Cell ID
Cell name
BCCH Freq. of adjacent cell 1~32
BCCH of Ncell 1~32
BA2(SACCH) table
Module ID
Cell ID
Cell name
BCCH Freq. of adjacent cell 1~32
BCCH of Ncell 1~32
Cell attribute table
Module ID
Cell ID
Cell name
Interference band threshold 0
Interf. band Thrsh. 0
Interference band threshold 1
Interf. band Thrsh. 1
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Interference band threshold 2
Interf. band Thrsh. 2
Interference band threshold 3
Interf. band Thrsh. 3
Interference band threshold 4
Interf. band Thrsh. 4
Interference band threshold 5
Interf. band Thrsh. 5
Average interference period
Interf. calculation period
Number of SACCH multiframes
SACCH Multi-Frames
Radio resource report period
CCCH load indication period
CCCH load threshold
CCCH load Thrsh.
Max. repeat times of phys. info.
Max resend times of Phy. Info.
Overload interval
Overload indication period
RACH busy threshold
RACH busy Thrsh.
Average RACH load timeslot
Average RACH load TS number
Max RC power reduction
T200 SDCCH(5ms)
T200 FACCH/full rate(5ms)
T200 FACCH/F
T200 FACCH/half rate(5ms)
T200 FACCH/H
T200 SACCH TCH SAPI0(10ms)
T200 SACCH TCH SAPI0
T200 SACCH TCH SAPI3(10ms)
T200 SACCH TCH SAPI3
T200 SACCH SDCCH(10ms)
T200 SACCH SDCCH
T200 SDCCH SAPI3(5ms)
T200 SDCCH SAPI3
T3105(10ms)
T3105
Max. timing advance
MAX TA
Frame start time
Paging times
Random access error threshold
Random access error Thrsh.
Power level
Power Class
RACH min. access level
DC bias voltage threshold
DC bias voltage Thrsh.
Cell extension class
Cell extension type
Cell extension offset
Diversity LNA bypass permitted
Cell alarm threshold table
Module ID
Cell ID
Cell name
Power output error threshold
Power output error Thrsh.
Power output reduction threshold
Power output reduction Thrsh.
VSWR TRX error threshold
VSWR TRX error Thrsh.
VSWR TRX unadjusted threshold
VSWR TRX unadjusted Thrsh.
Cell call control table
Module ID
Cell ID
Cell name
Immediate assignment of TCH
TCH immediate assignment
Immediate assign optimization
Immediate assignment Opt.
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Assign to non-random access cell
Immediate assign to other cell
Assigned to other cell
Assign to other cell
TCH assignment retry
Intra-cell HO from SDCCH to TCH
Intra-cell SD to TCH HO
Inter-BSC HO from SDCCH to TCH
Inter-cell SD to TCH HO
OM-orginated intra-cell CH HO
OM start intra-cell HO
OM-orig. intra-cell HO in BSC
OM start inter-cell HO(intraBSC)
OM-orig. inter-cell HO in BSC
OM start inter-BSC HO
Handover retry
HO retry
TCH flow alarm
TCH overload alarm
Radio CH release abnormal retry
RF CH abnormal release retry
Abis flow control permitted
TCH flow start
TCH flow control allowed
Circuit pool function selection
Circuit pool
Directed retry permitted
Direct retry
Cell call control para. table
Module ID
Cell ID
Cell name
T3101(100ms)
Assign-TCH idle rate threshold
Assign-TCH idle rate Thrsh.
Assign-TCH re-estb. rate thres.
Assign-TCH re-Estb. rate thrsh.
TCH flow control start threshold
TCH flow control start thrsh.
Max assignment retry times
Max handover retry times
Max HO retry times
SDCCH to TCH HO: TCH idle rate
Free TCH Thrsh. for SD to TCH HO
Max. radioCH release retry times
SDCCH-to-TCH HO request type
Service type Req.(SD to TCH HO)
Outg. HO request resend interval
Outg. HO req. max. resend times
Out BSC HO Req. resent times
Syst. delay frame No. adj. value
Response request selection
Response on out BSC HO Req.
Cell module information table
CGI
Module ID
Handover control table
Module ID
Cell ID
Cell name
Handover algorithm type
HO algorithm
Traffic channel HO min. interval
Min interval for TCH HOs
New assigned HO min. interval
Signaling CH HO min. interval
Min interval for SD HOs
Continuous HO min. interval
Min interval for consecutive HOs
Directed retry TALLOC
New emergency HO min. interval
Min interval for Emerg. HOs
5-108
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Inter-BSC HO on SDCCH allowed
Inter-BSC HO on SD allowed
Co-BSC/MSC adjustment allowed
Co-BSC/MSC Adj.
Signaling channel HO allowed
SD HO allowed
Penalty allowed
Penalty allowed
Intra-cell handover allowed
Intracell HO allowed
Load handover allowed
Load HO allowed
Fast-moving HO algorithm allowed
MS fast moving HO allowed
RXLEV drop HO algorithm allowed
Rx_Levell_Drop HO allowed
PBGT HO algorithm allowed
PBGT HO allowed
Post-HO PWR pred. alg. allowed
MS power prediction after HO
BTS meas. report preprocessing
M.R. Preprocessing
Transfer original meas. report
Transfer original M.R.
Transfer BS/MS power level
Transfer BS/MS power class
Reserved
Preprocessed meas. report freq.
Sent Freq.of preprocessed M.R.
Cell description table
Module ID
Cell ID
Cell name
BCCH
CGI
CGI
Network color code
NCC
BS color code
BCC
Reserved
Layer of the cell
Cell priority
Cell type
Inter-layer handover threshold
Inter-layer HO Thrsh.
Inter layer handover hysteresis
Inter-layer HO hysteresis
Speed penalty value
Penalty on MS Fast moving HO
Speed penalty duration
Penalty time on Fast moving HO
BCCH carrier transmission power
NON_BCCH transmission power
MS max. Tx power level
MS_TXPWR_MAX_CCH
Min DL power of candidate cell
Min DL level on candidate cell
Uplink optimal Rx level
UL expected level at HO access
External cell description table
External cell ID
Cell name
BCCH
CGI
CGI
Network color code
NCC
BS color code
BCC
Share MSC flag
Co-MSC
Reserved
Layer of the cell
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Cell priority
Inter-layer handover threshold
Inter-layer HO Thrsh
Inter layer handover hysteresis
Inter-layer HO hysteresis
Speed penalty value
Penalty on fast moving HO
Speed penalty time
Penalty time on fast moving HO
BCCH carrier transmission power
NON_BCCH transmission power
MS max. Tx power level
MS_TXPWR_MAX_CCH
Min DL power of candidate cell
Min DL level on candidate cell
Adjacent cell relation table
Module ID
Cell ID
Module ID of adjacent cell
Adjacent cell ID
Ncell ID
Cell name
Adjacent cell candidate type
Ncell candidate type
PBGT HO threshold
PBGT HO Thrsh.
Inter-layer handover hysteresis
Inter-cell HO hysteresis
SS plus offset of K array
SS minus offset of K array
AW offset
Minimum access level offset
Min access level offset
Filter table
Module ID
Cell ID
Cell name
Allowed measurement reports lost
Allowed M.R number lost
S/D sigl. strength filter length
Filter length for TCH level
S/D signal quality filter length
Filter length for TCH Qual.
SC signal strength filter length
Filter length for SD level
SC signal quality filter length
Filter length for SD Qual.
Adjacent cell filter length
Filter length for Ncell RX_LEV
TA filter length
Filter length for TA
Penalty table
Module ID
Cell ID
Cell name
HO failure cell strength penalty
Penalty level after HO fail.
HO failure penalty duration(s)
Penalty time after HO fail.
Bad quality HO strength penalty
Penalty level after BQ HO Fail.
Bad qual. HO penalty duration(s)
Penalty time after BQ HO Fail.
Timing adv. HO strength penalty
Penalty level after TA HO Fail.
Timing adv. HO penalty dur.(s)
Penalty time after TA HO Fail.
U/O HO failure penalty dur.(s)
Penalty time after IUO HO Fail.
Emergency handover table
Urgent handover table
Module ID
5-110
Data Configuration Manual
GSM9001800 BSS Network Planning Parameters ReferenceV3.2
Cell ID
Cell name
Emergency TA handover threshold
TA Thrsh.
Emergency HO DL qual. threshold
DL Qual. Thrsh.
Emergency HO UL qual. threshold
UL Qual. Thrsh.
Intf. HO UL quality threshold
UL Qual. Thrsh. for interf.HO
Intf. HO DL quality threshol
DL Qual. Thrsh. for interf.HO
Intf. HO UL Rx PWR threshold
UL RX_LEV Thrsh. for interf.HO
Intf. HO DL Rx PWR threshold
DL RX_LEV Thrsh. for interf.HO
Uplink level SHTM filter length
Filter parameter A1~A8
Filter parameter B
Minimum timing advance
MIN TA
Load handover table
Module ID
Cell ID
Cell name
Load HO flow level threshold
System flux Thrsh. for load HO
Load HO start threshold
Load HO Thrsh.
Load HO Rx threshold
Load Req. on candidate cell
Load HO bandwidth
Graded load HO cycle
Load HO step period
Graded load HO step
Load HO step level
Normal handover table
Normal handover data table
Module ID
Cell ID
Cell name
Uplink Rxlev border HO threshold
Edge HO UL RX_LEV Thrsh.
DL Rxlev border HO threshold
Edge HO DL RX_LEV Thrsh.
Border HO measurement time
Edge HO watch time
Border HO duration
Edge HO valid time
Inter-layer HO measurement time
Layer HO watch time
Inter-layer HO duration
Layer HO valid time
PBGT measurement time(s)
PBGT watch time
PBGT duration(s)
PBGT valid time
Fast-moving handover table
MS fast moving HO data table
Module ID
Cell ID
Cell name
Fast-moving cell meas. number
MS Fast-moving Watch cells
Fast-moving cell actual number
MS Fast-moving Valid cells
Fast-moving time threshold
MS Fast-moving time Thrsh.
Intra-cell cont. HO ctrl. table
Intra-cell Handover data table
Module ID
Cell ID
Cell name
5-111
Data Configuration Manual
GSM9001800 BSS Network Planning Parameters ReferenceV3.2
Max consecutive handover times
MAX consecutive HO times
Barred dur. after max. time(s)
Forbidden time after MAX times
Presumed consecutive interval
Interval for consecutive HO Jud.
GSM0508 handover table
Module ID
Cell ID
Cell name
Uplink HO Rx level threshold
UL HO Rx_LEVEL Thrsh.
Downlink HO Rx level threshold
DL HO RX_LEV Thrsh.
N5
P5
Uplink HO Rx quality threshold
UL HO RX_QUAL Thrsh.
Downlink HO Rx quality threshold
DL HO RX_QUAL Thrsh.
N6
P6
Uplink intra-cell HO Rx level
UL Intra-cell HO RX_LEV
Downlink intra-cell HO Rx level
DL Intra-cell HO RX_LEV
N7
P7
TA value handover permitted
TA HO Allowed
N8
P8
Power control selection table
Module ID
Cell ID
Cell name
Power control alg. selection
PC algorithm
Uplink power control permitted
UL PC allowed
Downlink power control permitted
DL PC allowed
Ordinary cell power control data
Ordinary cell PC table
Module ID
Cell ID
Cell name
Cell name
UL increment Rx level threshold
RX_LEV Thrsh. for UL increase
DL increment RX level threshold
RX_LEV Thrsh. for DL increase
P1
N1
UL decrement Rx level threshold
RX_LEV Thrsh. for UL decrease
DL decrement RX level threshold
RX_LEV Thrsh. for DL decrease
P2
N2
UL increment Rx qual. threshold
Qual. Thrsh. for UL increase
DL increment RX qual. threshold
Qual. Thrsh. for DL increase
P3
N3
UL decrement Rx qual. threshold
Qual. Thrsh. for UL decrease
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DL decrement RX qual. threshold
Qual. Thrsh. for DL decrease
P4
N4
Power control adjustment period
PC period
BTS power control table
Module ID
Cell ID
Cell name
Cell name
Power control adjustment period
BTS PC period
BTS power control in SDCCH
BTS PC in SD
Expected stable downlink level
DL RX_LEV expected
Downlink level filter length
Filter length for DL RX_LEV
Downlink loss compen. fact.
DL RX_LEV compensation
Expected downlink quality
DL Qual. expected
Downlink quality filter length
Filter length for DL Qual.
Downlink quality compen. factor
DL Qual. compensation
Min. BTS transmitting power
BTS min Tx power
Max. power control step
MAX PC step
Max. BTS transmitting power
BTS max Tx power
BTS Power control level
PC Adj. range
MS power control table
MS power control data
Module ID
Cell ID
Cell name
Cell name
Registration period
PC interval
Power control adjustment period
MS PC period
Expected initial signal level
Initial RX_LEV expected
Init. adj. phase filter length
Filter length for initial RX_LEV
Expt. stable state signal level
stable RX_LEV expected
Stable phase signal filter len.
Filter length for stable RX_LEV
Uplink compensation factor
UL RX_LEV compensation
Expected uplink quality
UL Qual. expected
Stable phase quality filter len.
Filter length for Qual.
Uplink quality compen. factor
UL Qual. compensation
PWR incr. range after HO failure
Power increment after HO Fail.
Max. power control step
MAX PC step
Radio CH management ctrl. table
Module ID
Cell ID
Cell name
Channel allocation algorithm
CH allocation algorithm
Intf. band preprecessing switch
Intf. band preprecessing allowed
Intf. band filter start length
Average interference band width
SDCCH dynamic allocation flag
SD dynamic allocation allowed
Idle SDCCH channel threshold
Idle SD Thrsh.
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Cell SDCCH channel maximum
Cell SD maximum
TCH minimum recovery time(s)
Idle TCH channel threshold N1
Idle TCH Thrsh. N1
Apply-TCH decision period T(m)
Bad CH management control table
Module ID
Cell ID
Cell name
Bad channel management switch
Bad CH management allowed
Bad channel definition threshold
Bad CH definition Thrsh.
Bad channel alarm threshold
Bad CH alarm Thresh.
HW II power control table
Module ID
Cell ID
Power control adjustment period
PC interval
Uplink level filter length
Filter length for UL RX_LEV
Downlink level filter length
Filter length for DL RX_LEV
Uplink quality filter length
Filter length for UL Qual.
Downlink quality filter length
Filter length for DL Qual.
Meas. report compensation switch
M.R. Compensation allowed
UL pre-measure report number
UL M.R. number predicted
DL pre-measure report number
DL M.R. number predicted
UL S-strength upper threshold
UL RX_LEV upper Thrsh.
UL S-strength lower threshold
UL RX_LEV lower Thrsh.
UL S-quality upper threshold
UL Qual. upper Thrsh.
UL S-quality lower threshold
UL Qual. lower Thrsh.
DL S-strength upper threshold
DL RX_LEV upper Thrsh.
DL S-strength lower threshold
DL RX_LEV lower Thrsh.
DL S-quality upper threshold
DL Qual. upper Thrsh.
DL S-quality lower threshold
DL Qual. lower Thrsh.
Quality zone 0 max dj. step
MAX Adj. value for Qual. zone 0
Quality zone 1 max adj. step
MAX Adj. value for Qual. zone 1
Quality zone 2 max adj. step
MAX Adj. value for Qual. zone 2
quality-based power adj. step
Adj. PC value by RxQual.
MS min. power allowed
MS min allowed power
MS max. power allowed
MS max allowed power
BTS max. transmitting power
BTS max. power
BTS power control level
BTS PC class
HWII Channel allocation table
SDCCH optimal allocation allowed
SD allocation priority allowed
Interfering priority allowed
Interf. priority allowed
Interf. meas. of occupied ch.
Active CH interf. Meas.allowed
TRX priority allowed
Allocation TRX priority allowed
History log priority allowed
History record priority allowed
Channel traffic balance allowed
Balance traffic allowed
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Data Configuration Manual
GSM9001800 BSS Network Planning Parameters ReferenceV3.2
UL interf. strength threshold
Interf. of UL level Thrsh.
UL interf. quality threshold
Interf. of UL Qual. Thrsh.
DL interf. strength threshold
Interf. of DL level Thrsh.
DL interf. quality threshold
Interf. of DL Qual. Thrsh.
TCH/data strength filter length
Filter length for speech/data level
TCH/data quality filter length
Filter length for speech/data Qual.
SDCCH strength filter length
Filter length for Signaling level
SDCCH quality filter length
Filter length for Signaling Qual.
History log's update period(m)
Updata Period of CH occupied record
History log's update step
Updata Freq. of CH occupied record
Concentric cell handover table
HW-IUO Handover Table
Module ID
Cell ID
U/O signal intensity difference
UO signal intensity difference
Rx level threshold
RX-LEV Thrsh.
Rx level hysteresis
RX-LEV Hysteresis
TA threshold
TA Thrsh.
TA hysteresis
U/O HO measurement time(s)
UO HO watch time
U/O HO duration(s)
UO HO valid time
Assign optimum layer
Assign-optimum-level threshold
Assign-optimum-level thrsh.
pref. subcell in HO of intra-BSC
Incoming-to-BSC HO optimum layer
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