Handover with LTE Handover
Feature Guide
Handover with LTE Handover
Handover with LTE Handover
Version
Date
Author
Reviewer
Notes
Compared with UR13, add new feature
V1.00
2015/05/20
Zhang Bo
Wang Juntao
“ZWF21-03-030 Load Based PS
Handover to LTE feature”, add 3.1.8 Iur
interface, updated 6.2~6.4
© 2015 ZTE Corporation. All rights reserved.
ZTE CONFIDENTIAL: This document contains proprietary information of ZTE and is not to be disclosed or used
without the prior written permission of ZTE.
Due to update and improvement of ZTE products and technologies, information in this document is subjected to
change without notice.
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Handover with LTE Handover
TABLE OF CONTENTS
1
Feature Attribute ............................................................................................... 6
2
2.1
2.1.1
2.1.2
2.2
Overview ............................................................................................................ 6
Feature Introduction ............................................................................................. 6
ZWF21-03-110 Handover with LTE ...................................................................... 6
ZWF21-03-030 Load Based PS Handover to LTE................................................ 7
Correlation with Other Features ........................................................................... 7
3
3.1
3.1.1
3.1.2
3.1.3
3.1.4
3.1.5
3.1.6
3.1.7
3.1.8
3.1.9
3.2
3.3
3.4
3.4.1
3.4.2
3.4.3
3.4.4
Technical Description ....................................................................................... 8
ZWF21-03-110 Handover with LTE ...................................................................... 8
Conditions of Handovers between UMTS and LTE .............................................. 8
Selection Strategy of UMTS Inter-Frequency and LTE Inter-RAT Handover ...... 10
EUTRAN Inter-RAT Measurements ................................................................... 11
Inter-RAT Event Triggering ................................................................................ 22
Inter-RAT Handover Decision and Execution ..................................................... 25
Inter-RAT Event Buffering .................................................................................. 26
Inter-RAT Periodical Reporting Measurement .................................................... 27
IUR interface ...................................................................................................... 29
EUTRAN Inter-RAT Handover Procedure .......................................................... 30
EUTRAN Blacklist Management ........................................................................ 30
EUTRAN Detection ............................................................................................ 31
ZWF21-03-030 Load Based PS Handover to LTE.............................................. 32
UMTS Cells’ Load Evaluation ............................................................................ 32
Measurement Initializing .................................................................................... 32
Measurement Reconfiguration ........................................................................... 33
Inter-RAT Handover Decision and Execution ..................................................... 33
4
4.1
4.2
4.3
4.4
Parameters....................................................................................................... 34
ZWF21-03-110 UMTS-LTE Handover ................................................................ 34
ZWF21-03-110 UMTS-LTE Handover Measurement ......................................... 39
EUTRAN Blacklist .............................................................................................. 63
ZWF21-03-030 Load Based PS Handover to LTE.............................................. 69
5
5.1
5.2
Related Counters and Alarms ........................................................................ 71
ZWF21-03-110 UMTS-LTE Handover ................................................................ 71
ZWF21-03-030 Load Based PS Handover to LTE.............................................. 71
6
6.1
6.2
Engineering Guide .......................................................................................... 72
Application Scenario .......................................................................................... 72
Feature Activation Procedure ............................................................................. 72
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6.2.1
6.2.2
6.2.3
6.2.4
6.3
6.3.1
6.3.2
6.3.3
6.4
6.4.1
6.4.2
6.4.3
6.5
6.5.1
6.5.2
UMTS-LTE Handover ........................................................................................ 72
UMTS-LTE Handover Measurement .................................................................. 77
EUTRAN Blacklist .............................................................................................. 84
Load Based PS Handover to LTE ...................................................................... 86
Feature Validation Procedure............................................................................. 89
ZWF21-03-110 UMTS-LTE Handover ................................................................ 89
EUTRAN blacklist .............................................................................................. 90
Load Based PS Handover to LTE ...................................................................... 91
Feature Deactivation Procedure......................................................................... 92
ZWF21-03-110 UMTS-LTE Handover ................................................................ 92
EUTRAN blacklist .............................................................................................. 92
Load Based PS Handover to LTE ...................................................................... 93
Network Impact .................................................................................................. 93
ZWF21-03-110 UMTS-LTE Handover ................................................................ 93
ZWF21-03-030 Load Based PS Handover to LTE.............................................. 94
7
NoneAbbreviation ........................................................................................... 94
8
Reference Document....................................................................................... 95
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FIGURES
Figure 3-1 Parameter Indexing Principle of Event 2D/2F during EUTRAN Inter-RAT
Handover..............................................................................................................................16
Figure 3-2 Parameter Indexing Principle of Inter-RAT handover events .............................19
Figure 3-3 3G->LTE PS Handover Procedure....................................................................30
Figure 6-1 Parameters configuration interface 1 ................................................................73
Figure 6-2 Parameters configuration interface 2 ................................................................73
Figure 6-3 Parameters configuration interface 3 ................................................................74
Figure 6-4 Parameters configuration interface 4 ................................................................74
Figure 6-5 Parameters configuration interface 5 ................................................................75
Figure 6-6 Parameters configuration interface 6 ................................................................75
Figure 6-7 Parameters configuration interface 7 ................................................................76
Figure 6-8 Parameters configuration interface 8 ................................................................76
Figure 6-9 Parameters configuration interface 9 ................................................................77
Figure 6-10 Parameters configuration interface 10 ...............................................................77
Figure 6-11 Parameters configuration interface 11 ...............................................................78
Figure 6-12 Parameters configuration interface 12 ...............................................................78
Figure 6-13 Parameters configuration interface 13 ...............................................................79
Figure 6-14 Parameters configuration interface 14 ...............................................................79
Figure 6-15 Parameters configuration interface 15 ...............................................................80
Figure 6-16 Parameters configuration interface 16 ...............................................................81
Figure 6-17 Parameters configuration interface 17 ...............................................................83
Figure 6-18 Parameters configuration interface 18 ...............................................................84
Figure 6-19 Parameters configuration interface 19 ...............................................................85
Figure 6-20 Parameters configuration interface 20 ...............................................................85
Figure 6-21 Parameters configuration interface 21 ...............................................................86
Figure 6-22 Parameters configuration interface 22 ...............................................................87
Figure 6-23 Parameters configuration interface 23 ...............................................................88
Figure 6-24 Parameters configuration interface 24 ...............................................................88
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Figure 6-25
Parameters configuration interface 25 ...........................................................89
TABLES
Table 2-1 License Control List ............................................................................................ 7
Table 3-1 Relationships between Services and EutraHoSw ................................................ 9
Table 3-2 Multiple sets of handover parameter configurations ...........................................15
Table 5-1 Counter List .......................................................................................................71
Table 6-1 Feature Validation Procedure 1..........................................................................89
Table 6-2 Feature Validation Procedure 2..........................................................................90
Table 6-3 Feature Validation Procedure 3..........................................................................91
Table 6-4 RNC parameter list 1 .........................................................................................92
Table 6-5 RNC parameter list 2 .........................................................................................92
Table 6-6 RNC parameter list 3 .........................................................................................93
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1
Feature Attribute
RNC version: [ZXWR RNC V3.14.10.14/ZXUR 9000 V4.14.10.14]
Node B version: [ZXSDR V4.14.10]
Attribute: [Optional]
Involved Network Element:
NE Name
Related or Not
UE
-
Node B
-
RNC
√
iTC
-
MSC
-
MGW
-
SGSN
-
GGSN
-
HLR
-
Special Requirements
“√”: involved
“-”: not involved
2
Overview
2.1
Feature Introduction
2.1.1
ZWF21-03-110 Handover with LTE
For a UMTS-LTE multi-mode terminal that has established a PS service in the UMTS
network, when it moves to the UMTS cell edge and needs to be handed over to the LTE
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network, the UMTS RAN initiates a handover request to the CN. The UMTS RAN
instructs the UE to access the EUTRAN upon reception of a handover initiation
command from the CN.
If the UE that has already established data traffic in the LTE network moves to the cell
edge, the LTE RNC instructs the UE to hand over to the UMTS network. The EUTRAN
initiates a handover request to the CN, the CN notifies the RNC to prepare resources so
that the UE can access the network, and then the RNC allocates resources to the UE
and sends the resource configuration information back to the CN waiting for the UE to
access the UMTS network.
The handover procedures supported by this feature are only applicable to the data traffic
users.
2.1.2
ZWF21-03-030 Load Based PS Handover to LTE
When UMTS load is high, RAN handovers or redirects some online PS data calls with
low priority to LTE network in order to relieve the load of UMTS network.License Control
This feature is controlled by the license and needs authorization from the administrator
before being activated.
Table 2-1
License Control List
Feature ID
ZWF21-03-110
ZWF21-03-030
2.2
Feature Name
License Control
Configured
Sales
Item
NE
Unit
UMTS handover
UMTS handover
with LTE
with LTE
Load Based PS
Load Based PS
Handover to LTE
Handover to LTE
RNC
RNC
RNC
RNC
Correlation with Other Features
1. Required Features
None
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2. Mutually Exclusive Features
None
3. Affected Features
None
3
Technical Description
3.1
ZWF21-03-110 Handover with LTE
To support PS handovers between UTRAN and EUTRAN and ensure continuous PS
services, the UE needs to be handed over or redirected to the LTE network in the case of
poor UMTS coverage.
The following describes the conditions of handovers between UMTS and LTE, EUTRAN
inter RAT measurements, and UMTS-to-LTE handover strategies.
3.1.1
Conditions of Handovers between UMTS and LTE
Handovers between UMTS and LTE are implemented in two procedures: the handover
procedure and RRC redirection procedure. ZTE has different switches to control these
two procedures that also require different UE capabilities. The following describes the
conditions of handovers between UMTS and LTE for these two procedures respectively.
For the handover procedure, the following describes the conditions of handovers
between UMTS and LTE:
1.
At least one UE supported EUTRAN neighbor cell exists.
2.
The RNC supports the LTE PS handover switch ULogicalRnc.RncPsHoLteSw which
is set to “1: On”.
3.
The UE is capable of supporting the handover to LTE, which means that the UE
notifies the RNC that it supports a PS handover from UTRAN to EUTRAN by
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sending Support of Inter-RAT PS Handover to E-UTRA FDD or Support of Inter-RAT
PS Handover to E-UTRA TDD.
4.
The inter-RAT switch (EutraHoSw) corresponding to the current UE service is
enabled. For the relationships between the EutraHoSw switch and the service
configuration parameters, refer to Table 3-1.
For the RRC redirection procedure, the following describes the handover conditions
between UMTS and LTE:
1.
The RNC supports the RRC redirection switch ULogicalRnc.RncPsRediLteSw
which is set to “1: On”;
2.
The UE is capable of supporting a handover to LTE or support LTE measurements.
In the case of supporting the handover to LTE, it means that the UE notifies the
RNC that it supports a PS handover from UTRAN to EUTRAN by sending Support
of Inter-RAT PS Handover to E-UTRA FDD or Support of Inter-RAT PS Handover to
E-UTRA TDD. In the case of supporting LTE measurements, it means that the UE
notifies the RNC that it supports EUTRAN measurements by sending a EUTRA
Feature Group Indicators bit2 message.
3.
The inter-RAT switch (EutraHoSw) corresponding to the current UE service is
enabled. For the relationships between the EutraHoSw switch and the service
configuration parameters, refer to Table 3-1.
Table 3-1
Relationships between Services and EutraHoSw
Service
EutraHoSw
R99 RT
ULogicalRnc.r99RtEutraHoSw
R99 NRT
ULogicalRnc.r99NrtEtraHoSw
HSDPA
ULogicalRnc.hsdpaEutraHoSw
HSUPA
ULogicalRnc.hsupaEutraHoSw
If the conditions of a UMTS handover to LTE (either handover or RRC redirection) are
fulfilled, in a network deployed with UMTS inter-frequency, GSM and LTE system,
whether the UE can be successfully handed over to LTE is determined by which
handover strategy is selected (inter-frequency or the inter-RAT). For the detailed
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description, refer to “3.1.2 Selection Strategy of UMTS Inter-Frequency and LTE
Inter-RAT Handover”.
In addition, for the UE handed over to LTE, the LTE system needs the UE E-UTRA
Capability information element from the UMTS system to allocate appropriate resources
to the UE. Therefore, a strategy based on UE E-UTRA Capability is added to the UMTS
system, and is controlled by the URncInfo.CheEutraCapiSw switch. If the switch is set to
“On”, the system needs to check whether the UE has reported UE E-UTRA Capability. If
yes, the handover procedure is triggered; otherwise, the handover is not allowed.
3.1.2
Selection Strategy of UMTS Inter-Frequency and LTE Inter-RAT
Handover
If the UE’s active set cell has UMTS inter-frequency, GSM and EUTRAN neighbor cells
at the same time, the target cell which the UE should be handed over to is determined by
the related strategies.
The strategies for selecting a target handover system are described as follows:
1.
If UCelInfoFDD.IfOrRatHoSwch is set to 1 or 2 or 3, the strategy below is performed:
1)
For the detailed procedure for selecting an inter-frequency or inter-RAT
handover, refer to “3.4.1 Selection of Inter-Frequency and Inter-RAT Handovers” in
“ZTE UMTS Handover Control Feature Guide”
2) If a PS inter-RAT handover is selected in 1), whether the UE is handed over to
GSM or EUTRAN depends on the following principles:
The UCelInfoFDD.ChoStraMulRatHo parameter controls whether the UE is handed
over to the GSM or EUTRAN system during the inter-RAT measurement.

If UCelInfoFDD.ChoStraMulRatHo is set to “Prior to GSM/GERAN”,

If a GSM neighbor cell exists, the GSM compressed mode and
inter-RAT measurement is started so that the UE can be handed over to
the GSM system.

If no GSM neighbor cell exists, the EUTRAN compressed mode and
inter-RAT measurement is started so that the UE can be handed over to
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the EUTRAN system.

If UCelInfoFDD.ChoStraMulRatHo is set to “Prior to EUTRAN FDD”,

If an EUTRAN neighbor cell exists, the EUTRAN compressed mode and
inter-RAT measurement is started so that the UE can be handed over to
the EUTRAN system.

If no EUTRAN neighbor cell exists, the GSM compressed mode and
inter-RAT measurement are started so that the UE can be handed over
to the GSM system.
2.
If UCelInfoFDD.IfOrRatHoSwch is set to “EUTRAN Firstly, Inter-frequency Secondly,
GSM Finally”, the strategy below is performed:
If a EUTRAN neighbor cell exists, the measurement of event 2D/2F for EUTRAN is
issued. When event 2D is triggered, then RNC activates compressed mode and
initializes EUTRAN measurement, if inter-frequency cells exist simultaneously, RNC
starts the timer URncFunction.T4ShifIfLteGsmMea. When the timer is expiry, RNC
stops the EUTRAN measurement and compressed mode, and initializes
inter-frequency measurement and compressed mode.
Note:
When the best cell changes or service changes, if compressed mode is activated,
the compressed mode remains unchanged as far as possible. Only if the
compressed mode can’t be maintained, RNC will reconfigure compressed mode
according to the priority of system.
3.1.3
EUTRAN Inter-RAT Measurements
EUTRAN inter-RAT measurements indicate the measurements to the signal quality of a
EUTRAN cell, preparing for the handover from UMTS to LTE.
The ZTE UMTS system supports two reporting criteria for the EUTRAN inter-RAT
measurements: periodical or event-triggered reporting, and controls which reporting
criterion is selected by URncFunction.IntRatHoMth.
The event-triggered reporting indicates that the UE checks whether the inter-RAT
triggering events are fulfilled in accordance with the P-CPICH quality measurement
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results of intra cells. If yes, the UE reports the inter-RAT events (including event ID and
target cell) to the RNC.
The periodical reporting indicates that the UE regularly reports the P-CPICH quality
measurement results of the inter-RAT cell to the RNC, and the RNC checks whether the
inter-RAT triggering events are fulfilled in accordance with the measurement reporting
results. If yes, the RNC gives the inter-RAT events (including event ID and target cell).
The measurement reporting criteria in this chapter are all event-triggered reporting if
there is no special description. For the periodical reporting criteria, refer to “
Inter-RAT
Periodical Measurement”.
3GPP has defined a group of inter-RAT measurement events as follows. If the defined
condition is fulfilled, the UE will report the corresponding event to the RNC.
Event 3A: The estimated quality of the currently used UTRAN frequency is below a
certain threshold and the estimated quality of the other system is above a certain
threshold, which is used for inter-RAT handover decision.
Event 3B: The estimated quality of other system is below a certain threshold, which is a
reserved event.
Event 3C: The estimated quality of other system is above a certain threshold, which is
used for inter-RAT handover decision.
Event 3D: Change of best cell in other system, which is a reserved event.
3.1.3.1
Measurement Setup
When the conditions of handover to LTE (mentioned in 3.1.1 Conditions of Handover
between UMTS and LTE) are fullfiled, an inter-RAT measurement is set up in
accordance with the value of the EUTRAN Service Handover information element in the
Rab Assignment Request message.
1.
If the value of the EUTRAN Service Handover information element is set to
“Handover to EUTRAN shall not be performed,” it indicates that the service cannot
be handed over to the EUTRAN. The RNC will not set up any inter-RAT
measurement for this service, and the handover to EUTRAN will not be triggered.
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2.
If the value of the EUTRAN Service Handover information element is set to a value
different from “Handover to EUTRAN shall not be performed,” it indicates that the
service can be handed over to the EUTRAN. The RNC will set up an inter-RAT
measurement in either of the following scenarios:
a)
Inter-frequency measurement has already been initiated, all non-used
frequencies have triggered event 2E, and a EUTRAN neighbor cell exists.
b)
The used frequency has poor quality, and event 2D related to EUTRAN
measurement configuration is reported.
Note:
Specified in 3GPP specifications, the information of up to eight EUTRAN frequencies can
be sent to the UE. The UE can only measure up to four EUTRAN FDD and TDD carriers
each. Therefore, the RNC can only send four EUTRAN FDD and four EUTRAN TDD
frequencies to the UE.
3.1.3.2
Measurement Modification
After an inter-RAT measurement is set up, the measurement can be modified under
either of the following conditions:

If the inter-RAT measurement parameters and frequencies of EUTRAN
neighbor cell are changed after the soft handover, the inter-RAT measurement
parameters and frequency information need to be updated by modifying the
measurement.

In the case of adding or deleting a service, if the handover parameters of a
single service and concurrent services
are
different, the
inter-RAT
measurement parameters need to be updated by modifying the measurement.
3.1.3.3
Measurement Deletion
A measurement should be deleted under any of the following conditions:

If the inter-RAT measurement is started before the hard handover, it should be
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stopped.

If either of the following two conditions is fulfilled after a soft handover is
performed, the inter-RAT measurement should be deleted.
1) The active set cell does not have a EUTRAN neighbor cell.
2) The RNC or cell switch does not allow the UE to be handed over to the EUTRAN
neighbor cell.

The used frequency quality is improving.

The value of Service Handover is changed to “Handover to E-UTRAN shall not
be performed”

If an abnormal inter-RAT measurement report (for example, a nonexistent
measurement task in the RNC) is received, the corresponding inter-RAT
measurement should be deleted.
The RNC records the timestamp when the measurement of a certain ID is deleted and
the measurement information is released. If the RNC receives the measurement report
with the measurement ID that has been deleted afterwards, it directly discards the
measurement report, and check the time difference between the current time and the
time to release the measurement. If the time difference exceeds a threshold (set by the
URncFunction.TResndMeaCtrlRel parameter), the RNC performs measurement deletion
again.
3.1.3.4
Parameter Configuration

Handover parameter configuration under micro diversity
All measurement parameters are generated based on cells. In the case of micro
diversity, the measurement parameters configured in the cell with best quality are
used as handover parameters. If the best cell is changed, the measurement
parameters should be updated simultaneously.

Multiple sets of handover parameter configurations
Inter-RAT handover parameters can be independently configured in accordance
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with the application scenarios, measurement quantities, measurement reporting
criteria and service bearer types. Multiple sets of measurement parameters are
needed for different purpose. The details are described as follows:
Table 3-2
Factor
Multiple sets of handover parameter configurations
Application Scenario
Applicatio
Common outdoor scenario
n
High-speed outdoor
Scenario
scenario
Parameter
URatMeasProfile.intialHoCelSelScene
Indoor scenario
Subway or tunnel
Measure
UTRAN:
ment
PCPICH Ec/No
UTRAN:
PCPICH RSCP
UUtranCellFDD.NonIntraMeasQuan
quantity
PCPICH Ec/No and
EUTRAN: RSRP, not controlled by any
RSCP
parameter.
EUTRAN: RSRP
Measure
Event-triggered reporting
ment
Periodical reporting
URncFunction.IntRatHoMth
reporting
criterion
Service
RT RAB Including Voice
bearer
RT RAB Excluding Voice on
type
Single NRT on DL DCH/UL
URatMeasSrvSpec.srvCategory
DCH
Single NRT RAB on DL
HS-DSCH/UL DCH
Single NRT RAB on DL
HS-DSCH/UL E-DCH
All Multi-NRT RAB on DL
DCH/UL DCH
Multi-NRT RAB, HSPA is
Involved and only DCHs are
Used in UL
Multi-NRT RAB, HSPA is
Involved and E-DCH is
Used in UL
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Factor
Application Scenario
Parameter
Multi RAB Including CS and
PS
Not Related to Service Type
(used for measurement set)
Note:
If the concurrent services contain CS and PS services, the handover parameters are
indexed to “Multi RAB including CS and PS”.
If the concurrent services contain non-CS RT services, the handover parameters are
indexed to “RT RAB Excluding Voice”.
If both of the above two conditions are fulfilled, the first criteria is followed.

Handover parameter indexing principle
1.
To modify and optimize parameters more easily, inter-RAT handover parameters are
used based on indexing. For the detailed parameter indexing principle of Event
2D/2F during EUTRAN inter-RAT handover, see Figure 3-1:
Figure 3-1
Parameter Indexing Principle of Event 2D/2F during EUTRAN Inter-RAT
Handover
UUtranCellFDD
refUInterMeasProfile
UInterMeasProfile
UInterMeaSrvSpec
NonIntraMeasQuan
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UInterEcNoEvMeasforE
UInterRscpEvMeasforE
srvCategory
srvCategory
InterMeasCfgNo
InterMeasCfgNo
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a)
First, you can obtain an inter-frequency configuration set UInterMeasProfile by
matching UInterMeasProfile.profileId with UUtranCellFDD.refUinterMeasProfile.
Then you can obtain the measurement object UInterMeaSrvSpec of the
corresponding service in the configuration set.
b)
In the measurement object UInterMeaSrvSpec, you can obtain the current
measurement
object
(UInterEcNoEvMeasforE/UInterRscpEvMeasforE)
in
accordance with the measurement quantity UUtranCellFDD.NonIntraMeasQuan.
Then, you can obtain the InterMeasCfgNo (inter-frequency measurement
configuration
number)
in
accordance
UInterMeaSrvSpec.srvCategory. Finally,
with
you can
the
service
type
obtain the event 2D/2F
parameters of the EUTRAN inter-RAT handover through the indexing to
InterMeasCfgNo. The details are described as follows:
i.
If the current frequency measurement quantity is Ec/No, you can refer to the
following table to obtain the parameters that are matched with InterMeasCfgNo
and associated
with
UInterEcNoEvMeasforE.InterMeasCfgNo
from
the
UInterEcNoEvMeasforE object.
Full Name
Event ID of Inter-frequency
Parameter
UInterEcNoEvMeasforE.meaEvtId
measurement reporting
Number of events defined by
UInterEcNoEvMeasforE.measEvtNum
the inter-frequency
measurement
Filter coefficient of
UInterEcNoEvMeasforE.filterCoeff
inter-frequency measurement
Hysteresis range for making
UInterEcNoEvMeasforE.hysteresis
decision
Time difference between the
UInterEcNoEvMeasforE.TrigTime
event triggering and reporting
Weight of frequency used by
UInterEcNoEvMeasforE.Wused
event 2d/2f to make quality
decision
Absolute threshold of
UInterEcNoEvMeasforE.ThreshUsedFreq
frequency used by event 2d/2f
to make quality decision
ii.
If the current frequency measurement quantity is RSCP, you can refer to the
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following table to obtain the parameters that are matched with InterMeasCfgNo
and
associated
with
UInterRscpEvMeasforE.InterMeasCfgNo
from
the
UInterRscpEvMeasforE object.
Full Name
Event ID of Inter-frequency
Parameter
UInterRscpEvMeasforE.meaEvtId
measurement reporting
Number of events defined by
UInterRscpEvMeasforE.measEvtNum
the inter-frequency
measurement
Filter coefficient of
UInterRscpEvMeasforE.filterCoeff
inter-frequency measurement
Hysteresis range for making
UInterRscpEvMeasforE.hysteresis
decision
Time difference between the
UInterRscpEvMeasforE.TrigTime
event triggering and reporting
Weight of frequency used by
UInterRscpEvMeasforE.Wused
event 2d/2f to make quality
decision
Absolute threshold of
UInterRscpEvMeasforE.ThreshUsedFreq
frequency used by event 2d/2f
to make quality decision
2.
For the indexing principle of the Inter-RAT handover event, see Figure 3-2.
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Figure 3-2
Parameter Indexing Principle of Inter-RAT handover events
UUtranCellFDD
refURatMeasProfile
URatMeasProfile
a)
URatMeasSrvSpec
URatMeasNoSrvSpec
NonIntraMeasQuan
NonIntraMeasQuan
URatEcNoEvMeasforE
URatRscpEvMeasforE
srvCategory
srvCategory
InterRatCfgNo
InterRatCfgNo
URatEcNoPrdMeas
URatEcNoPrdMeas
InterRatCfgNo
InterRatCfgNo
To obtain the inter-RAT handover parameters, first, you need to obtain the inter-RAT
measurement configuration set UratMeasProfile by matching
URatMeasProfile.profileId with UUtranCellFDD.refURatMeasProfile. Then you can
obtain the measurement object in the next level in accordance with the reporting
criterion currently used by the UE in this configuration set. If the measurement
reporting criterion is event-triggered reporting, you can obtain the next-level
measurement object from the UratMeasSrvSpec object. If the measurement
reporting criterion is periodical reporting, you can obtain the next-level measurement
object from the UratMeasNoSrvSpec object.
b)
If the measurement object obtained in Step a) is URatMeasSrvSpec, you can obtain
the current measurement object (URatEcNoEvMeasforE or URatRscpEvMeasforE)
in accordance with the measurement quantity UUtranCellFDD.NonIntraMeasQuan.
Then, you can obtain InterRatCfgNo (inter-RAT measurement configuration number)
in accordance with the service type URatMeasSrvSpec.srvCategory. If the
measurement object obtained in Step a) is UratMeasNoSrvSpec, you can obtain the
current measurement object and InterRatCfgNo (inter-RAT measurement
configuration number) in accordance with the measurement quantity
UUtranCellFDD.NonIntraMeasQuan. Finally, you can obtain the inter-RAT handover
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measurement parameters of the current application scenario and service through
the indexing to InterRatCfgNo. The details are described as follows:
i.
If the event-triggering reporting is used, and the UMTS measurement quantity is
Ec/No, you can refer to the following table to obtain the parameters that are matched
with InterRatCfgNo and associated with URatEcNoEvMeasforE.InterRatCfgNo from
the URatEcNoEvMeasforE object.
Full Name
Event ID of Inter-RAT
Parameter
URatEcNoEvMeasforE.EventId
measurement
Number of events defined by the
URatEcNoEvMeasforE.EventNum
inter-RAT measurement
UTRAN filter coefficient of
URatEcNoEvMeasforE.FilterCoeff
inter-RAT measurement
EUTRAN filter coefficient of
URatEcNoEvMeasforE.eUtranFilterCoeff
inter-RAT measurement
Hysteresis range for making
URatEcNoEvMeasforE.Hysteresis
decision
Time difference between the event
URatEcNoEvMeasforE.TrigTime
triggering and reporting
Weight of UTRAN quality decision
URatEcNoEvMeasforE.W
in event 3a
Absolute threshold of UTRAN
URatEcNoEvMeasforE.Thresh
quality decision in event 3a
Absolute threshold of other system
URatEcNoEvMeasforE.ThreshSys
quality decision in event 3a/3b/3c
ii.
If the event-triggering reporting is used, and the UMTS measurement quantity is
RSCP, you can refer to the following table to obtain the parameters that are
matched with InterRatCfgNo and associated with
URatRscpEvMeasforE.InterRatCfgNo from the URatRscpEvMeasforE object.
Full Name
Event ID of Inter-RAT
Parameter
URatRscpEvMeasforE.EventId
measurement
Number of events defined by the
URatRscpEvMeasforE.EventNum
inter-RAT measurement
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Full Name
UTRAN filter coefficient of
Parameter
URatRscpEvMeasforE.FilterCoeff
inter-RAT measurement
EUTRAN filter coefficient of
URatRscpEvMeasforE.eUtranFilterCoeff
inter-RAT measurement
Hysteresis range for making
URatRscpEvMeasforE.Hysteresis
decision
Time difference between the event
URatRscpEvMeasforE.TrigTime
triggering and reporting
Weight of UTRAN quality decision
URatRscpEvMeasforE.W
in event 3a
Absolute threshold of UTRAN
URatRscpEvMeasforE.Thresh
quality decision in event 3a
Absolute threshold of other system
URatRscpEvMeasforE.ThreshSys
quality decision in event 3a/3b/3c
iii.
If the periodical reporting is used, and the UMTS measurement quantity is Ec/No,
you can refer to the following table to obtain the parameters that are matched with
InterRatCfgNo and associated with URatEcNoPrdMeas.InterRatCfgNo from the
URatEcNoPrdMeas object.
Full name
UTRAN filter coefficient of
Parameter
URatEcNoPrdMeas.FilterCoeff
inter-RAT measurement
EUTRAN filter coefficient of
URatEcNoEvMeasforE.eUtranFilterCoeff
inter-RAT measurement
Number of periodical reporting
URatEcNoPrdMeas.PrdRptAmount
times
Periodical reporting interval
iv.
URatEcNoPrdMeas.PrdRptInterval
If the periodical reporting is used, and the UMTS measurement quantity is RSCP,
you can refer to the following table to obtain the parameters that are matched with
InterRatCfgNo and associated with URatRscpPrdMeas.InterRatCfgNo from the
URatRscpPrdMeas object.
Full Name
UTRAN filter coefficient of
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Parameter
URatRscpPrdMeas.FilterCoeff
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Full Name
Parameter
inter-RAT measurement
EUTRAN filter coefficient of
URatEcNoEvMeasforE.eUtranFilterCoeff
inter-RAT measurement
Number of periodical reporting
URatRscpPrdMeas.PrdRptAmount
times
Periodical reporting interval
URatRscpPrdMeas.PrdRptInterval
Where,
EventNum (URatEcNoEvMeasforE.EventNum/URatRscpEvMeasforE.EventNum) and
EventId (URatEcNoEvMeasforE.EventId/URatRscpEvMeasforE.EventId) control how
many events can be configured during the inter-RAT measurement, and which events
should be configured. EventId is defined as an array whose dimension number is
EventNum. The EventNum is configured up to four because there are a total of four
events (3A, 3B, 3C, 3D) in the inter-RAT measurement.
3.1.4
Inter-RAT Event Triggering
3.1.4.1
Measurement Result Filtering
To avoid measurement fluctuation during inter-RAT measurements, the UE needs to
perform layer-3 filtering to the measurement results. Then, the UE determines whether
an event is triggered in accordance with the filtered measurement value, and reports the
measurement results to the RNC. For the filtering principle and formula, refer to “3.2.2.1
Measurement Result Filtering” in “ZTE UMTS Handover Control Feature Guide”. The
layer-3 filtering coefficient k is obtained based on the following principles:
During a UMTS measurement, k based on measurement reporting criteria and
measurement quantity can be obtained through the following parameters respectively:
URatEcNoEvMeasforE.FilterCoeff/URatRscpEvMeasforE.FilterCoeff
/URatEcNoPrdMeas.FilterCoeff/URatRscpPrdMeas.FilterCoeff.
During a EUTRAN measurement, k based on measurement reporting criteria and
measurement quantity can be obtained through the following parameters respectively:
URatEcNoEvMeasforE.EutraFilterCoeff/URatRscpEvMeasforE.
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EutraFilterCoeff/URatEcNoPrdMeas.EutraFilterCoeff/
URatRscpPrdMeas.EutraFilterCoeff .
3.1.4.2
Quality Estimation Criteria for UMTS Carriers
The UMTS handover to LTE is implemented based on the UMTS service quality
estimated by the following formula:
 NA

QUTRAN  10  LogMUTRAN  W  10  Log  Mi   (1  W)  10  LogMBest
 i1 
Where,
QUTRAN is the measurement result of the current UTRAN frequency;
MUTRAN is the physical measurement value of the current UTRAN frequency;
Mi is the physical measurement value of i cell in the current active set;
NA is the number of cells in the active set (excluding the best cell);
MBest is the measurement result of the best cell in the active set;
W is the weight that the best cell in the active set occupies in the quality estimation for
the current UTRAN frequency. It is based on the measurement quantity and obtained
from
the
parameters
of
the
following
two
objects:
URatEcNoEvMeasforE
/
URatRscpEvMeasforE.
3.1.4.3
Event 3A Triggering
Event 3A: The estimated quality of the currently used UTRAN frequency is below a
certain threshold and the estimated quality of the other system is above a certain
threshold, which is used for inter-RAT handover decision.
QUsed  TUsed  H3a /2
And
MOther
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RAT
 CIOOther RAT  TOther
RAT
 H3a /2
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Where,
QUsed is the value of the estimated quality of the currently used UTRAN frequency.
TUsed is an absolute threshold of the currently used frequency difference, which can be
obtained from the Thresh parameter in the record associated with the configuration
number determined by the method of “3.1.3.4 Parameter Configuration”.
H3a is the hysteresis for event 3A decision. It can be obtained from the Hysteresis
parameter in the record associated with the configuration number determined by the
method of “3.1.3.4 Parameter Configuration”.
MOther RAT is the measurement result of the other RAT system quality;
CIOOther RAT is the quality offset of the other RAT cell (invalid for LTE cells).
TOther RAT is an absolute threshold of the other RAT cell with a good quality. It can be
obtained from the ThreshSys parameter in the record associated with the configuration
number determined by the method of “3.1.3.4 Parameter Configuration”.
3.1.4.4
Event 3C Triggering
Event 3C: The estimated quality of other system is above a certain threshold, which is
used for inter-RAT handover decision.
MOther
RAT
 CIOOther
RAT
 TOther
RAT
 H3c /2
Where,
MOther RAT is the quality measurement result of the other RAT system.
CIOOther RAT is the quality offset of the other RAT system cell (invalid for LTE cells).
TOther RAT is an absolute threshold of the other RAT cell with a good quality. It can be
obtained from the Thresh parameter in the record associated with the configuration
number determined by the method of “3.1.3.4 Parameter Configuration”.
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H3c is the hysteresis for event 3C decision. It can be obtained from the Hysteresis
parameter in the record associated with the configuration number determined by the
method of “3.1.3.4 Parameter Configuration”.
3.1.5
Inter-RAT Handover Decision and Execution
3.1.5.1
Event 3A/3C Processing
During an inter-RAT handover, either 3A or 3C can be triggered in the same cell.
Specifically, which event is used to make an inter-RAT handover decision is controlled by
the inter-RAT handover policy parameter UUtranCellFDD.RatHoTactic.
Upon the reception of event 3A or 3C measurement report, ZTE RNC performs a
handover or RRC connection redirection in accordance with the following principles:

If ULogicalRnc.RncPsHoLteSw and ULogicalRnc.RncPsRediLteSw are both
enabled,

If the UE is capable of supporting the PS handover, the EUTRAN PS
handover procedure is executed.

If the UE is incapable of supporting the PS handover, the RRC connection
redirection procedure is executed. The RNC notifies the UE through the
RRC Connection Release message and fills the target cell frequency into the
inter-RAT measurement report into the message.

If ULogicalRnc.RncPsHoLteSw is enabled, and ULogicalRnc.RncPsRediLteSw is
disabled,

The EUTRAN PS handover procedure is executed. The UE that does not
satisfy the condition to start the handover procedure will not initiate the
EUTRAN inter-RAT measurement.

If ULogicalRnc.RncPsHoLteSw is disabled, and ULogicalRnc.RncPsRediLteSw is
enabled,

The RRC connection redirection procedure is executed. The RNC notifies
the UE through the RRC Connection Release message and fills the target
cell frequency in the inter-RAT measurement report into the message.
If the EUTRAN inter-RAT PS handover fails, to prevent the UE from being repeatedly
handed over to EUTRAN within a short time, which affects the system performance, ZTE
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RNC starts a penalty timer (ULogicalRnc.HoToEutraPenTimer) for the UE handover
failure. At the expiry of this timer, the inter-RAT measurement whose measurement report
has not been processed by the RNC will be initiated again.
In addition, ZTE RNC provides a compatible strategy for the SGSN that does not support
the UTRAN handover to LTE by using the eNodeB ID. The RNC controls the ID used in
the UTRAN handover to LTE through the UIupsLink.LteCellIdenFlag parameter.
If the SGCN office configuration does not support the UTRAN handover to LTE by using
eNodeB ID, UIupsLink.LteCellIdenFlag is set to 1, which means that the UMTS system
uses the RNC ID to identify the EUTRAN cell during the UTRAN handover to LTE.
3.1.6
Inter-RAT Event Buffering
If the RNC receives an inter-RAT measurement report but discards it without any
processing because the RNC is busy on other events (for example, Radio Bearer
Reconfiguration), the handover opportunity is lost easily and call drops may occur.
Therefore, the measurement report needs to be buffered, and waits for processing by the
RNC after the RNC completes the current event.
The inter-RAT buffering strategies are described as follows:

Inter-RAT event buffering supports up to six events.

For event 2D/2F
during an inter-RAT handover, if the measurement quantity
is “Ec/No” or “RSCP”, only the measurement report that has the same
measurement quantity with UUtranCellFDD.NonIntraMeasQuan can be
buffered. If the measurement quantity is “Ec/No and RSCP” the event 2D or 2F
of the latest Ec/No and RSCP are buffered.

If event 3A or 3C exists in the buffer and event 2F is triggered, and if the
measurement quantity of event 2F is the same as the current event, the
buffered event is deleted and event 2F is buffered. Otherwise, event 2F is
discarded.

If the measurement quantity of event 2F in the buffer is the same with the
current event (3A or 3C), and if another event 3A or 3C is reported, the current
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event is discarded. If there is no other event 3A or 3C, the current event is
buffered.

After the handover is successfully performed, all the measurement reports in
the buffer should be cleared.
3.1.7
Inter-RAT Periodical Reporting Measurement
If URncFunction.IntRatHoMth is set to “0: Periodical Reporting”, and if the conditions
(mentioned in Chapter 3.1.1 Handover Conditions between UMTS and LTE) of handover
to LTE are fulfilled, ZTE RNC starts an inter-RAT measurement in periodical reporting,
and creates the LTE handover events in accordance with the event-3c-triggering decision
conditions based on the EUTRAN cell signal quality periodically reported by the UE.
Then, a handover or redirection procedure is executed based on the created event.
The subsequent handover execution performed by the RNC is the same as the
event-triggering reporting performed by the UE. For the detailed description, refer to
“3.1.5.1 Event 3A/3C Processing”. This chapter only describes how to enable/disable the
periodical reporting measurement and create handover events by the RNC.
3.1.7.1
Periodical Reporting Measurement
For the parameters of periodical reporting measurement, refer to “3.1.3.4 Parameter
Configuration”.
The periodical reporting measurement setup, modification and deletion procedures are
the same as the event-triggering reporting measurement, refer to the corresponding
procedures in "3.1.3 EUTRAN Inter-RAT Measurement”.
3.1.7.2
Principle for Creating Event 3C
After the UE periodically reports the signal quality of the target LTE cell, ZTE RNC makes
a decision in accordance with event 3C triggering decision conditions.
If the duration of TriggerTime_3c continuously satisfies event 3C triggering conditions,
event 3C is created. Where, TriggerTime_3c is the triggering hysteresis duration and
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controlled by the UCelInfoFDD.PeriodTriggerTime parameter.

Event 3C triggering decision condition:
QTarget_Rat_Cell>= TTarget_Rat_Cell+H/2
Where,
QTarget_Rat_Cell is the target EUTRAN cell quality.
TTarget_Rat_Cell is the decision threshold of the target EUTRAN cell quality. It can be
obtained from the ThreshSys parameter in the record associated with the configuration
number determined by the method of “3.1.3.4 Parameter Configuration”.
H is the hysteresis of event 3C, and can be obtained from the hysteresis parameter in the
record associated with configuration number determined by the method of “3.1.3.4
Parameter Configuration”.
3.1.7.3
Combination of Inter-RAT Periodical Reporting and Inter-Frequency
Measurement
If the UMTS inter-frequency and EUTRAN handover are both allowed, the combination of
inter-RAT periodical reporting measurement and inter-frequency measurement should
be considered.
The detailed strategies are described as follows:
(1) If UCelInfoFDD.IfOrRatHoSwch is “Inter Frequency Is Prior to Inter RAT”, The RNC
performs
the
inter-frequency
inter-frequency
compressed
measurement
mode
and
and
activates
starts
the
corresponding
the
timer
UrncFunction.T4ShifIfLteGsmMea. After the UE reports event 2E or the timer is expiry,
the RNC is reconfigured to the EUTRAN measurement and activates EUTRAN
compressed mode.
(2) If UCelInfoFDD.IfOrRatHoSwch is “EUTRAN Firstly, Inter-frequency Secondly, GSM
Finally”, The RNC performs the EUTRAN measurement and activates the corresponding
EUTRAN compressed mode and starts the timer UrncFunction.T4ShifIfLteGsmMea.
After the timer is expiry, the RNC is reconfigured to the inter-frequency measurement
and activates inter-frequency compressed mode.
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The UMTS inter-frequency measurement is controlled by UrncFunction.InterHoMth,
while the LTE inter-RAT measurement is controlled by UrncFunction.IntRatHoMth.
2. If the UMTS inter-frequency measurement criterion is periodical reporting and the LTE
inter-RAT measurement criterion is periodical reporting,
The RNC starts inter-frequency and inter-RAT measurement in periodical reporting
criterion at the same time, and simultaneously activates the inter-frequency and
EUTRAN compressed mode.
3.1.8
IUR interface
For EUTRAN neighboring cells of DRNC, RNC only saves frequencies information.

If the complete information of EUTRAN neighbor cells is returned by the DRNC,
then the strategy of SRNC is as “3.1.5 Inter-RAT Handover Decision and
Execution”.

If part information of EUTRAN neighbor cells is returned by the DRNC, only
redirection can be triggered for these cells. The strategy is as follows:

The RNC will fill the frequency information of EUTRAN neighbor cells
configured in SRNC, and the frequency information of EUTRAN neighbor
cells returned by the DRNC in Measurement Control message.

When inter-rat event is triggered, if the frequency of the reported cell belongs
to that of DRNC’s cells, the redirection will be performed, and the RNC fills
this frequency in RRC Connection Release message.

For DRNC, whether it returns complete information of EUTRAN neighbor cells is
controlled by UIurLink.pciTacPlmnFilInd.
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3.1.9
EUTRAN Inter-RAT Handover Procedure
Figure 3-3
3G->LTE PS Handover Procedure
UE
NODE B
RNC
CN
eNB
RELOCATION REQUIRED
HANDOVER REQUEST
HANDOVER REQUEST ACK
RELOCATION COMMAND
HANDOVER FROM UTRAN COMMAND
HANDOVER DETECT
HANDOVER COMPLETE
HANDOVER COMPLETE
IU RELEASE COMMAND
RADIO LINK DELETION REQUEST
RADIO LINK DELETION RESPONSE
IU RELEASE COMPLETE
3.2
EUTRAN Blacklist Management
Before the UE is handed over from UTRAN to EUTRAN (LTE network), the RNC notifies
the UE of the EUTRAN cell that is not allowed to be measured through an EUTRAN
blacklist, to prevent the UE from being handed over to this EUTRAN cell and avoid a
handover failure.
This function is controlled by the blacklist management switch of a EUTRAN neighbor
cell: UtranCellFDD.EutranNCblstSwch.
The details are described as follows:
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For the UE in non-dedicated state, refer to “ZTE UMTS Cell Reselection with LTE
Feature Guide”.
For the UE in dedicated state, through the measurement result, the RNC notifies the UE
of the neighbor cell whose UENbrBlkList.StateMode in the EUTRAN neighbor cell
blacklist management list is 1, and prohibits the UE to search the neighbor cell in the
blacklist.
A frequency is allowed to be configured up to 16 cells in the EUTRAN blacklist.
To determine a blacklist, refer to the following table to obtain related parameters, and
enters the value of the parameter into the UENbrBlkList object to create a record.
Full name
Parameter
Eutran frequency band indication
UENbrBlkList.EutranFreqBandInd
EUTRAN downlink absolute radio
UENbrBlkList.earfcnDl
frequency channel number
EUTRAN blacklist cell number
UENbrBlkList.NEutranNum
configured for each frequency
EUTRAN physical cell ID
UENbrBlkList.EutranCId
EUTRAN blacklist neighbor cell
UENbrBlkList.StateMode
state
3.3
EUTRAN Detection
The EUTRAN Detection function helps the UE in the CELL_PCH/URA_PCH/IDLE state
to measure the signal quality of a EUTRAN cell that has lower priority than the current
cell and report it to the NAS layer. It is used to display the EUTRAN coverage state in the
terminal interface.
This function is controlled by the UPriSel.EutraDetectionInd switch. If the switch is set to
“1: Yes”, the RNC notifies the UE of the detection information through the UTRAN
MOBILITY INFORMATION message. After the UE in CELL_PCH/URA_PCH/IDLE state
receives the instruction from the RNC, the EUTRAN Detection function is enabled.
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3.4
ZWF21-03-030 Load Based PS Handover to LTE
When UMTS load is high, RAN handovers or redirects some online PS data calls at low
priority to LTE network in order to relieve the load of UMTS network. This function is
controlled
by
URncFunction.loadTrgU2LRncSwi
and
UExtCelInfoFDD.loadTrgUmts2LteSwi.
3.4.1
UMTS Cells’ Load Evaluation

Downlink Load
Downlink load status is based on downlink power(DlPower).
Downlink load
DlPower
status
Normal load
DlPower < UExtCelInfoFDD.dlPwrReleThrHO2Lte
High load
DlPower >= UExtCelInfoFDD.dlHighPwrThrHO2Lte
Note:
The calculation of DLPower refers to “ZTE UMTS Load Adaptive Power Control Feature
Guide”.

Uplink Load
Uplink load status is based on uplink power(ROT).
Uplink load status
ROT
Normal load
RoT< UExtCelInfoFDD.rotReleaThrHO2Lte
High load
RoT>= UExtCelInfoFDD.highRotThrHO2Lte
Note:
The calculation of ROT refers to “ZTE UMTS Load Adaptive Power Control Feature
Guide”.
3.4.2
Measurement Initializing
If the following conditions are satisfied, RNC chooses periodically MaxLoadHoNum low
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priority users, who support LTE measurement and only have PS services in the
Cell_DCH state, to start EUTRAN compressed mode and measurement and initialize the
timer URncInfo.psHoLteMeasTimer.

URncFunction.loadTrgU2LRncSwi and UExtCelInfoFDD.loadTrgUmts2LteSwi are
“On”.

The cell is in high load status. For the cell load status refer to “3.4.1 UMTS Cells’
Load Evaluation”
Note:

The period is indicated by URncInfo.loadTrg2LtePeriod.

The definition of priority refers to “ZTE UMTS QOS Guarantee Feature Guide”

MaxLoadHoNum

-
For uplink, indicated by ULdCtrl.ulMaxForHoNum
-
For downlink, indicated by ULdCtrl.dlMaxForHoNum.
If the user is chosen to initialize compressed mode, it will not be chosen again in
ULogicalRnc.hoToEutraPenTimer.
3.4.3
Measurement Reconfiguration
When timer URncInfo.psHoLteMeasTimer hasn’t expire yet, If event 2D or handover
based on uplink power/downlink power/uplink BLER(The details refer to “ZTE UMTS
Handover Control Feature Guide”,” ZTE UMTS Transmitted Power Based Handover
Feature Guide”,” ZTE UMTS Quality Based Handover Feature Guide”) is triggered,
then the RNC stops the timer and reconfigures the measurement.
3.4.4
Inter-RAT Handover Decision and Execution
Upon the reception of event 3A or 3C measurement report, ZTE RNC performs strategy
as 3.1.5 Inter-RAT Handover Decision and Execution.
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4
Parameters
4.1
ZWF21-03-110 UMTS-LTE Handover
Managed
Logic
Object
Name
ULogicalRn
c.RncPsHo
LteSw
RNC Switch
for PS
Handover
with LTE
Parameter Description
The parameter indicates whether
Value
Range
0: Off
RNC supports PS handovers to
LTE.
Unit
Default
Value
Recom
mende
d Value
0: Off
N/A
1:On
1: On
The parameter indicates whether
the RNC supports PS redirection
with LTE. If the function is
enabled, UEs supporting EUTRAN
ULogicalRn
c.RncPsRe
diLteSw
RNC Switch
for PS
Redirection
with LTE
measurement are permitted to be
handed over to EUTRAN through
0: Off
a redirection procedure. However,
when RncPsHoLteSw and
0: Off
N/A
1:On
1: On
RncPsRediLteSw are both "On",
those UEs supporting PS
handover with EUTRAN will be
switched to EUTRAN through a PS
handover procedure.
0:
GSM/GE
UCelInfoFD
D.ChoStra
MulRatH
Choice
Strategy in
Multi-RAT
Handover
This parameter indicates the policy
for selecting a system for
RAN
prefer
handovers when multimode
inter-RAT neighboring cells exist
at the same time.
0:
N/A
1:
GSM/GE EUTRA
1:
RAN
N FDD
EUTRAN
prefer
prefer
FDD
prefer
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This parameter is the switch for
checking the UE E-UTRA
Capability before initiating a PS
URncInfo.C
heEutraCa
piSw
Switch of
handover procedure from UMTS to
checking the LTE. If the function is enabled, the 0:Off
UE E-UTRA RNC checks whether the UE
Capability
0:Off
N/A
1:On
1:On
reports the UE E-UTRA Capability.
If the UE E-UTRA Capability is
reported, the PS handover
procedure is permitted.
UIupsLink. Method of
This parameter indicates the
LteCellIden Identify
method that the SGSN uses to
Flag
identify the EUTRAN cell.
EUtran cell
0: use
eNodeBI
D 1: use
0: use
N/A
0: use
eNodeBI eNodeBI
D
D
N/A
1: On
1: On
N/A
1: On
1: On
N/A
1: On
1: On
N/A
1: On
1: On
RNCID
R99 RT Inter
ULogicalRn Rat
This parameter indicates whether
c.r99RtEutr (EUTRAN)
an inter-RAT R99 RT EUTRAN
aHoSw
Handover
handover is allowed or not.
0: Off
1: On
Switch
R99 NRT
ULogicalRn Inter Rat
This parameter indicates whether
c.r99NrtEtr (EUTRAN)
an inter-RAT R99 NRT EUTRAN
aHoSw
handover is allowed or not.
Handover
0: Off
1: On
Switch
HSDPA Inter
ULogicalRn Rat
This parameter indicates whether
c.hsdpaEut (EUTRAN)
an inter-RAT HSDPA EUTRAN
raHoSw
Handover
handover is allowed or not.
0: Off
1: On
Switch
HSUPA Inter
ULogicalRn Rat
This parameter indicates whether
c.hsupaEut (EUTRAN)
an inter-RAT HSUPA EUTRAN
raHoSw
Handover
handover is allowed or not.
0: Off
1: On
Switch
ZTE Confidential Proprietary
35
Handover with LTE Handover
This parameter indicates the
threshold of the time when an
RNC resends the
MEASUREMENT CONTROL
RELEASE message.
When the RNC sends the
MEASUREMENT CONGROL
RELEASE message for a
The Time
Threshold
that the RNC
URncFuncti May Resend
on.TResnd the
MeaCtrlRel MEASUREM
ENT
CONTROL
RELEASE
measurement ID, the time stamp is
recorded. If the RNC receives the
report with the measurement ID, it
compares the current time with the
recorded time. If the difference
(1..255)s
between the current time and the , step 1s
s
30
30
1: 3A
1: 3A
Event
Event
recorded time exceeds the
threshold configured, the
MEASUREMENT CONTROL
RELEASE message is resent;
otherwise, this measurement
report is discarded and the
MEASUREMENT CONTROL
RELEASE message is not resent.
This parameter is used to control
the sending frequency for the
MEASUREMENT CONTROL
RELEASE message.
UUtranCell Inter-RAT
FDD.RatHo Handover
Tactic
Tactic
This parameter indicates the
0:
inter-RAT handover policy.
Algorith
In most scenarios, this parameter m
Deciding
is set to 3A Event Trigger to
ensure precise inter-frequency
1: 3A
handovers. In some scenarios
Event
N/A
Trigger Trigger
where it is required to hand over to Trigger
the target cell as soon as possible, 2: 3C
this parameter is set to Algorithm Event
Deciding or 3C Event Trigger.
ZTE Confidential Proprietary
Trigger
36
Handover with LTE Handover
0: Turn
off
Inter-freq
uency
and
Inter-RA
T
Handove
This parameter indicates how to
r
perform neighbor measurement if 1: Only
both the inter-frequency and
Inter
inter-RAT neighboring cells exist. Frequen
Inter
UCelInfoFD Frequency or
D.IfOrRatH Inter RAT
oSwch
Handover
Switch
For inter-RAT, when GSM
cy
3: Inter 3: Inter
neighbor cells and EUTRAN
2: Only
Frequen Frequen
neighbor cells are both exist, only Inter
the measurement of the higher
RAT
N/A
cy Is
cy Is
Prior to Prior to
priority system is issued. When the 3: Inter
Inter
Inter
value is not 4, the priority of GSM Frequen
RAT
RAT
and EUTRAN is indicated by
cy Is
ChoStraMulRatHo. When the
Prior to
value is 4, EUTRAN is prior to
Inter
GSM by default.
RAT
4:EUTR
AN
Firstly,
Inter-freq
uency
Secondly
, GSM
Finally
ZTE Confidential Proprietary
37
Handover with LTE Handover
0:
Configur
e
Inter-Fre
quency
and
0:
Inter-Rat
Configur Configur
compres
e
sed
ULogicalRn
c.CompMd
CfgStra
Mode
Configuratio to UE simultaneously or not when 1:
n Strategy
quency quency
simultan
compressed modes are configured eously
inter-frequency and inter-RAT
Configur
neighboring cells exist.
e
e
Inter-Fre Inter-Fre
This parameter indicates whether mode
Compressed inter-frequency and inter-RAT
0:
and
N/A
and
Inter-Rat Inter-Rat
compres compres
Inter-Fre
sed
sed
mode
mode
simultan simultan
quency
eously
eously
0
0
and
Inter-Rat
compres
sed
mode
individua
lly
This parameter indicates the
interval between reception of
periodical reports and triggering of
the inter-frequency or inter-RAT
Time To
Trigger for
UCelInfoFD
D.PeriodTri
ggerTime
Inter-frequen
cy and
Inter-Rat
Period
Measuremen
t
handover. Only the neighboring
cell in which the signal quality is
above a certain threshold in all
periodic reports during a time
equal to this parameter can be
selected as the target cell for the
(0..255)s
, step 1s
s
inter-frequency or inter-rat
handover. If this parameter is set
to a large value, the probability of
incorrect decision is low. However,
the handover algorithm becomes
slow in responding to signal
change.
ZTE Confidential Proprietary
38
Handover with LTE Handover
This parameter indicates the
interval between the events that
the RNC performs inter-frequency
measurement, GSM inter-RAT
measurement and EUTRAN
inter-RAT measurement.
URncFuncti
on.T4ShifIf
LteGsmMe
a
Timer for
When inter-frequency is prior to
Shifting
inter-RAT, the timer is initialized
Inter-frequen after the RNC performs
cy
inter-frequency measurement. If
Measuremen the quality of non-used frequency
t and
is poor within the timer duration,
Inter-RAT
the RNC will perform inter-RAT
(1..20)s,
step 1s
s
5
5
N/A
1: On
1: On
N/A
1: Fill
1: Fill
Measuremen measurement.
t
When EUTRAN inter-RAT is prior
to inter-frequency, the timer is
initialized after the RNC performs
EUTRAN inter-RAT measurement.
If the timer is expiry, the RNC will
perform inter-frequency
measurement.
ULogicalR
nc.rncPsH
oL2UtraS
w
RNC Switch
for PS
The parameter indicates whether
Handover
RNC supports PS handovers from
0: Off
1: On
from LTE to LTE to UTRAN.
UTRAN
This parameter indicates the rule
of filling PCI, TAC and PLMN List
PCI, TAC
UIurLink.p and PLMN
ciTacPlmn List Filling
FilInd
Principle
Indicator
of LTE neighboring cells as a
DRNC.
0: Don‘t
fill
0: No, not fill PCI, TAC and PLMN
1: Fill
List.
1: Yes, fill PCI, TAC and PLMN
List.
4.2
ZWF21-03-110 UMTS-LTE Handover Measurement
Managed
Logic
Parameter
Value
Object
Name
Description
Range
ZTE Confidential Proprietary
Unit
Default
Recommen
Value
ded Value
39
Handover with LTE Handover
0: Outdoor
This parameter indicates Scene
URatMeas
Profile.intial
HoCelSelS
cene
Mobility
Configuratio
n Scene
typical handovers and
1:
cell reselection
High-Mobility
scenarios. For each
Outdoor
scenario, the
Scene
corresponding
2: Indoor
0: Outdoor
0: Outdoor
N/A
Scene
Scene
N/A
1: RSCP
1: RSCP
parameter can be set to Scene
different values.
3: Subway/
tunnel Scene
This parameter indicates
UTRAN measurement
quantity for
inter-frequency and
inter-RAT
UTRAN
Measuremen
UUtranCell t Quantity for
FDD.NonIn Inter-frequen
traMeasQu cy and
an
Inter-RAT
Measuremen
ts
measurements. For
inter-frequency/inter-RA
T handover,the main
factor that affects signal
quality is the distance
between the cell and the
base station, Cpich
0: Ec/No
1: RSCP
2: Ec/No and
RSCP
RSCP is adopted. But
for some specical
scenario(such as
interference is very
serious), Cpich EcNo
and RSCP is more
suitable.
ZTE Confidential Proprietary
40
Handover with LTE Handover
0:
RT RAB
Bearer Type
URatMeas Used for
SrvSpec.sr Differentiatin
vCategory g Handover
Configuratio
n
ZTE Confidential Proprietary
RT RAB 0:
RT RAB
Including
Including
Including
Voice
Voice
Voice
1:
1:
RT RAB
RT RAB 1:
RT RAB
Excluding
Excluding
Excluding
Voice
Voice
Voice
2: Single NRT
2: Single NRT 2: Single NRT
This parameter
Service and
0:
on DL
distinguishes handover DCH/UL DCH
parameter
3: Single NRT
configurations based on
RAB on DL
services and bearer
HS-DSCH/UL
types. Handover-related
DCH
parameter
4: Single NRT
configurations, for
RAB on DL
example, handover
HS-DSCH/UL
triggering threshold,
E-DCH
hysteresis, vary based
5: All
on different service
Multi-NRT
characteristics. Based
RAB on DL
on the real-time feature,
DCH/UL DCH
channel types and the
6: Multi-NRT
number of RABs,
RAB, HSPA
services are divided into
is Involved
nine types for different
and only
parameter
DCHs are
configurations. The
Used in UL
value 0xff corresponds
7: Multi-NRT
to the periodical
on DL
on DL
DCH/UL DCH DCH/UL DCH
3: Single NRT 3: Single NRT
RAB on DL
RAB on DL
HS-DSCH/UL HS-DSCH/UL
DCH
DCH
4: Single NRT 4: Single NRT
RAB on DL
RAB on DL
HS-DSCH/UL HS-DSCH/UL
E-DCH
E-DCH
5: All
5: All
Multi-NRT
Multi-NRT
RAB on DL
RAB on DL
DCH/UL DCH DCH/UL DCH
6: Multi-NRT 6: Multi-NRT
RAB, HSPA RAB, HSPA
is Involved
is Involved
and only
and only
DCHs are
DCHs are
Used in UL
Used in UL
7: Multi-NRT 7: Multi-NRT
measurement, which
RAB, HSPA
RAB, HSPA RAB, HSPA
must be used in all
is Involved
is Involved
services.
and E-DCH is
and E-DCH is and E-DCH is
Used in UL
Used in UL
8: Multi Rab
8: Multi Rab 8: Multi Rab
Including CS
Including CS Including CS
and PS
and PS
0xff: Unralted
0xff: Unralted 0xff: Unralted
with type of
with type of
with type of
service
service
service
is Involved
Used in UL
and PS
41
Handover with LTE Handover
This parameter indicates
the ID of the inter-RAT
measurement profile
UUtranCell Used
FDD.refUR Inter-RAT
atMeasProf Measuremen
ile
t Profile
object. A profile
corresponds to a set of
intra-RAT measurement N/A
N/A
configurations. Each cell
System
System
generates
generates
automatically. automatically.
obtains the intra-RAT
measurement
parameters based on
the profile ID.
This parameter indicates
the profile ID of a set of
intra-frequency
Intra-frequen measurement
URatMeas cy
parameters. Each cell
Profile.profi Measuremen obtains the
leId
0
0
This parameter indicates
System
System
the index number of
generates
generates
inter-RAT measurement
automatically. automatically.
t Profile
intra-frequency
Identity
measurement
0~99
N/A
parameters in
accordance with the
profile ID.
parameter
URatEcNo
EvMeasfor
E.InterRatC
fgNo
Inter-RAT
Measuremen
t
Configuratio
n Index
configurations. It is used
to index parameter
configuration sets for
inter-RAT measurement.
0..65535
N/A
There are several sets
of measurement
configurations for the
same set of parameters
based on measurement
purposes.
ZTE Confidential Proprietary
42
Handover with LTE Handover
This parameter indicates
the ID of the event
triggered by inter-RAT
measurement. It is
related to the
URatEcNo Inter-RAT
measurement quantity.
EvMeasfor Event
E.EventId Identity
3a, 3b, 3c, 3d N/A
3a, 3b, 3c, 3d 3a, 3b, 3c, 3d
MAX_RAT_MEAS_EVE
NT indicates the
maximum number of
inter-RAT measurement
events, and its value is
4.
This parameter indicates
the number of events
URatEcNo Inter-RAT
EvMeasfor Measuremen
E.EventNu t Event
m
Number
required to be
1..MAX_RAT
configured for an
_MEAS_EVE
inter-RAT measurement NT
configuration number for Which,
a certain purpose.This
N/A
4
4
MAX_RAT_M
parameter is related to EAS_EVENT
the method of
=4.
determining inter-RAT
handover.
ZTE Confidential Proprietary
43
Handover with LTE Handover
This parameter indicates
the filtering factor that is
used by a UE to perform
L3 filtering on
intra-frequency
measurement results.
On the UE side, a UE
performs L1
intra-frequency
measurement at a fixed
measurement cycle
(during which several
points are measured.
How L1 filters the
measurement result
depends on UEs.). After
that, L1 reports the
result to L3 at certain
time intervals and L3
performs filtering on the
latest measurement
result and the previous
measurement result.
The filtering shall be
performed based on the
URatEcNo
following formula
EvMeasfor UTRAN Filter specified in 3GPP TS
E.FilterCoe Coefficient
ff
0, 1, 2, 3, 4,
5, 6, 7, 8, 9,
25.331: Fn = (1-a)*Fn-1 11, 13, 15,
17, 19
+a*Mn, in which:
N/A
3
3
Fn indicates the
currently filtered
measurement result;
Fn-1 indicates the
previously filtered
measurement result;
Mn indicates the latest
measurement result;
a = 1/2^ (k/2), in which k
is the filtering factor;
Note: If k is set to 0, no
L3 filtering is performed.
From the above formula,
the smaller the value of
ZTE Confidential Proprietary
the filtering factor is, the
greater impact the latest
measurement result has
on the measurement
44
Handover with LTE Handover
This parameter indicates
the filtering factor that is
used by a UE to perform
L3 filtering on EUTRAN
measurement results in
inter-RAT measurement.
On the UE side, a UE
performs L1 inter-RAT
measurement at a fixed
measurement cycle
(during which several
points are measured.
How L1 filters the
measurement result
depends on UEs.). After
that, L1 reports the
result to L3 at certain
time intervals and L3
performs filtering on the
latest measurement
result and the previous
measurement result.
The filtering shall be
performed based on the
URatEcNo
following formula
EvMeasfor EUTRAN
specified in 3GPP TS
E.
25.331: Fn = (1-a)*Fn-1
Filter
eUtranFilter Coefficient
Coeff
+a*Mn, in which:
0, 1, 2, 3, 4,
5, 6, 7, 8, 9,
11, 13, 15,
N/A
3
3
17, 19
Fn indicates the
currently filtered
measurement result;
Fn-1 indicates the
previously filtered
measurement result;
Mn indicates the latest
measurement result;
a = 1/2^ (k/2), in which k
is the filtering factor;
Note: If k is set to 0, no
L3 filtering is performed.
From the above formula,
the smaller the value of
the filtering factor is, the
ZTE Confidential Proprietary
greater impact the latest
measurement result has
on the measurement
result that is finally
45
Handover with LTE Handover
This parameter indicates
the hysteresis used to
determine whether to
trigger an event. This
parameter is used as a
reference to distinguish
the status to trigger an
event from the status to
end the event to avoid
the transition of statuses
due to a small change.
URatEcNo
The greater the value of
EvMeasfor
Hysteresis is, the
E.Hysteresi
s
Hysteresis
greater the difference
between the threshold to
(0,
0.5..7.5)dB
dB
4,4,2,4
4,4,2,4
step 0.5dB
trigger an event and the
threshold to end the
event is.
It is related to the
measurement quantity
and event types.
MAX_RAT_MEAS_EVE
NT is the maximum
number of inter-RAT
measurement events,
and its value is 4.
ZTE Confidential Proprietary
46
Handover with LTE Handover
This parameter indicates
the difference in time
when an event is
detected and when it is
reported. The event will
be triggered and
reported only when it
URatEcNo
EvMeasfor
E.TrigTime
(0, 10, 20,
40, 60, 80,
meets all the triggering 100, 120,
Time To
conditions within the
Trigger
triggering duration
240, 320,
indicated by this
640, 1280,
parameter after being
2560,
detected.
5000)ms
160, 200,
ms
100,100,100, 100,100,100,
100
100
0,0,0,0
0,0,0,0
MAX_RAT_MEAS_EVE
NT is the maximum
number of inter-RAT
measurement events,
and its value is 4.
This parameter indicates
the weight of the cell
with the best quality in
the calculation of the
UTRAN system quality
URatEcNo
EvMeasfor
E.W
Weight of the
UTRAN
System for
3A
(for the 3a event only). It
is used to determine the
quality of the UTRAN
system in inter-RAT
(0.0..2.0),
step 0.1
N/A
measurement.
MAX_RAT_MEAS_EVE
NT is the maximum
number of inter-RAT
measurement events,
and its value is 4.
ZTE Confidential Proprietary
47
Handover with LTE Handover
This parameter indicates
the absolute threshold of
the UTRAN cell quality
that the UE uses for
determination of event
3a. If the quality of the
current system is lower
than this threshold
minus hysteresis/2 for a
period of time, then the
system is considered to
be of poor quality, and it
is necessary to perform
an inter-RAT handover CPICH
Absolute
URatEcNo Threshold of
EvMeasfor the Quality of
E.Thresh
UTRAN Cell
for 3A
quickly. If the quality of RSCP:
the current system is
(-115..-25 )dB
higher than this
m step 1dB
threshold plus
CPICH
N/A
-9,-24,-24,-24 -9,-24,-24,-24
hysteresis/2 for a period Ec/No:
of time, then the system (-24..0) dB
is considered to be of
step 1dB
good quality, and there
is no need to perform an
inter-RAT handover.
The range and unit of
this parameter is related
to the measurement
quantity of the UTRAN
cell.
MAX_RAT_MEAS_EVE
NT is the maximum
number of inter-RAT
measurement events,
and its value is 4.
ZTE Confidential Proprietary
48
Handover with LTE Handover
This parameter indicates
the absolute threshold
configured for event
3a/3b/3c, used for
determining the quality
of other RATs. If the
quality of a system plus
the cell individual offset
is higher than this
threshold plus
hysteresis/2 for a period
of time, then the system
is considered to be of
good quality, and can
serve as a target system
for handovers. If the
quality of a system plus
the cell individual offset
is lower than this
threshold minus
URatEcNo
EvMeasfor
E.ThreshSy
s
Absolute
hysteresis/2 for a period
Threshold of of time, then the system
the Quality of is considered to be of
Other RAT
poor quality, and cannot
for 3A/3B/3C serve as a target system
for handovers.
The range and unit of
this parameter is related
to the measurement
(-140..0)
CPICH
RSCP:
(-115..-25 )dB
m step 1dB
CPICH
Ec/No:
N/A
-90,-95,-95,-1 -90,-95,-95,-1
15
15
(-24..0) dB
step 1dB
RSRP:
(-140..-44)dB
m step 1dB
quantity of other RATs.
The measurement
quantity GSM Carrier
RSSI of the GSM
system corresponds to
CPICH RSCP of the
UTRAN system, so the
value range and unit of
this parameter
corresponds to CPICH
RSCP.
MAX_RAT_MEAS_EVE
NT is the maximum
number of inter-RAT
measurement events,
ZTE Confidential Proprietary
and its value is 4.
49
Handover with LTE Handover
This parameter indicates
System
System
the index number of
generates
generates
inter-RAT measurement
automatically. automatically.
parameter
URatRscpE
vMeasforE.
InterRatCfg
No
Inter-RAT
Measuremen
t
Configuratio
n Index
configurations. It is used
to index parameter
configuration sets for
inter-RAT measurement.
0..65535
N/A
There are several sets
of measurement
configurations for the
same set of parameters
based on measurement
purposes.
This parameter indicates
the ID of the event
triggered by inter-RAT
measurement. It is
related to the
URatRscpE Inter-RAT
measurement quantity.
vMeasforE. Event
EventId
Identity
3a, 3b, 3c, 3d N/A
3a, 3b, 3c, 3d 3a, 3b, 3c, 3d
MAX_RAT_MEAS_EVE
NT indicates the
maximum number of
inter-RAT measurement
events, and its value is
4.
This parameter indicates
the number of events
URatRscpE
vMeasforE.
EventNum
Inter-RAT
Measuremen
t Event
Number
required to be
1..MAX_RAT
configured for an
_MEAS_EVE
inter-RAT measurement NT
configuration number for Which,
a certain purpose.This
N/A
4
4
MAX_RAT_M
parameter is related to EAS_EVENT
the method of
=4.
determining inter-RAT
handover.
ZTE Confidential Proprietary
50
Handover with LTE Handover
This parameter indicates
the filtering factor that is
used by a UE to perform
L3 filtering on
intra-frequency
measurement results.
On the UE side, a UE
performs L1
intra-frequency
measurement at a fixed
measurement cycle
(during which several
points are measured.
How L1 filters the
measurement result
depends on UEs.). After
that, L1 reports the
result to L3 at certain
time intervals and L3
performs filtering on the
latest measurement
result and the previous
measurement result.
The filtering shall be
performed based on the
URatRscpE
vMeasforE.
FilterCoeff
following formula
UTRAN Filter specified in 3GPP TS
Coefficient
0, 1, 2, 3, 4,
5, 6, 7, 8, 9,
25.331: Fn = (1-a)*Fn-1 11, 13, 15,
17, 19
+a*Mn, in which:
N/A
3
3
Fn indicates the
currently filtered
measurement result;
Fn-1 indicates the
previously filtered
measurement result;
Mn indicates the latest
measurement result;
a = 1/2^ (k/2), in which k
is the filtering factor;
Note: If k is set to 0, no
L3 filtering is performed.
From the above formula,
the smaller the value of
ZTE Confidential Proprietary
the filtering factor is, the
greater impact the latest
measurement result has
on the measurement
51
Handover with LTE Handover
This parameter indicates
the filtering factor that is
used by a UE to perform
L3 filtering on EUTRAN
measurement results in
inter-RAT measurement.
On the UE side, a UE
performs L1 inter-RAT
measurement at a fixed
measurement cycle
(during which several
points are measured.
How L1 filters the
measurement result
depends on UEs.). After
that, L1 reports the
result to L3 at certain
time intervals and L3
performs filtering on the
latest measurement
result and the previous
measurement result.
The filtering shall be
performed based on the
URatRscpE
vMeasforE.
eUtranFilter
Coeff
following formula
EUTRAN
specified in 3GPP TS
Filter
25.331: Fn = (1-a)*Fn-1
Coefficient
+a*Mn, in which:
0, 1, 2, 3, 4,
5, 6, 7, 8, 9,
11, 13, 15,
N/A
3
3
17, 19
Fn indicates the
currently filtered
measurement result;
Fn-1 indicates the
previously filtered
measurement result;
Mn indicates the latest
measurement result;
a = 1/2^ (k/2), in which k
is the filtering factor;
Note: If k is set to 0, no
L3 filtering is performed.
From the above formula,
the smaller the value of
the filtering factor is, the
ZTE Confidential Proprietary
greater impact the latest
measurement result has
on the measurement
result that is finally
52
Handover with LTE Handover
This parameter indicates
the hysteresis used to
determine whether to
trigger an event. This
parameter is used as a
reference to distinguish
the status to trigger an
event from the status to
end the event to avoid
the transition of statuses
due to a small change.
The greater the value of
URatRscpE
vMeasforE. Hysteresis
Hysteresis
Hysteresis is, the
greater the difference
between the threshold to
(0,
0.5..7.5)dB
dB
4,4,4,4
4,4,4,4
step 0.5dB
trigger an event and the
threshold to end the
event is.
It is related to the
measurement quantity
and event types.
MAX_RAT_MEAS_EVE
NT is the maximum
number of inter-RAT
measurement events,
and its value is 4.
ZTE Confidential Proprietary
53
Handover with LTE Handover
This parameter indicates
the difference in time
when an event is
detected and when it is
reported. The event will
be triggered and
reported only when it
URatRscpE
vMeasforE.
TrigTime
(0, 10, 20,
40, 60, 80,
meets all the triggering 100, 120,
Time To
conditions within the
Trigger
triggering duration
240, 320,
indicated by this
640, 1280,
parameter after being
2560,
detected.
5000)ms
160, 200,
ms
100,100,100, 100,100,100,
100
100
0,0,0,0
0,0,0,0
MAX_RAT_MEAS_EVE
NT is the maximum
number of inter-RAT
measurement events,
and its value is 4.
This parameter indicates
the weight of the cell
with the best quality in
the calculation of the
UTRAN system quality
URatRscpE
vMeasforE.
W
Weight of the
UTRAN
System for
3A
(for the 3a event only). It
is used to determine the
quality of the UTRAN
system in inter-RAT
(0.0..2.0),
step 0.1
N/A
measurement.
MAX_RAT_MEAS_EVE
NT is the maximum
number of inter-RAT
measurement events,
and its value is 4.
ZTE Confidential Proprietary
54
Handover with LTE Handover
This parameter indicates
the absolute threshold of
the UTRAN cell quality
that the UE uses for
determination of event
3a. If the quality of the
current system is lower
than this threshold
minus hysteresis/2 for a
period of time, then the
system is considered to
be of poor quality, and it
is necessary to perform
an inter-RAT handover CPICH
Absolute
URatRscpE Threshold of
vMeasforE. the Quality of
Thresh
UTRAN Cell
for 3A
quickly. If the quality of RSCP:
the current system is
(-115..-25 )dB
higher than this
m step 1dB
threshold plus
CPICH
N/A
-95,-115,-115 -95,-115,-115
,-115
,-115
hysteresis/2 for a period Ec/No:
of time, then the system (-24..0) dB
is considered to be of
step 1dB
good quality, and there
is no need to perform an
inter-RAT handover.
The range and unit of
this parameter is related
to the measurement
quantity of the UTRAN
cell.
MAX_RAT_MEAS_EVE
NT is the maximum
number of inter-RAT
measurement events,
and its value is 4.
ZTE Confidential Proprietary
55
Handover with LTE Handover
This parameter indicates
the absolute threshold
configured for event
3a/3b/3c, used for
determining the quality
of other RATs. If the
quality of a system plus
the cell individual offset
is higher than this
threshold plus
hysteresis/2 for a period
of time, then the system
is considered to be of
good quality, and can
serve as a target system
for handovers. If the
quality of a system plus
the cell individual offset
is lower than this
threshold minus
Absolute
hysteresis/2 for a period
URatRscpE Threshold of of time, then the system
vMeasforE. the Quality of is considered to be of
ThreshSys Other RAT
poor quality, and cannot
for 3A/3B/3C serve as a target system
for handovers.
The range and unit of
this parameter is related
to the measurement
(-140..0)
CPICH
RSCP:
(-115..-25 )dB
m step 1dB
CPICH
Ec/No:
N/A
-90,-95,-95,-1 -90,-95,-95,-1
15
15
(-24..0) dB
step 1dB
RSRP:
(-140..-44)dB
m step 1dB
quantity of other RATs.
The measurement
quantity GSM Carrier
RSSI of the GSM
system corresponds to
CPICH RSCP of the
UTRAN system, so the
value range and unit of
this parameter
corresponds to CPICH
RSCP.
MAX_RAT_MEAS_EVE
NT is the maximum
number of inter-RAT
measurement events,
ZTE Confidential Proprietary
and its value is 4.
56
Handover with LTE Handover
This parameter indicates
System
System
the index number of
generates
generates
inter-RAT measurement
automatically. automatically.
parameter
URatEcNo
PrdMeas.In
terRatCfgN
o
Inter-RAT
Measuremen
t
Configuratio
n Index
configurations. It is used
to index parameter
configuration sets for
inter-RAT measurement.
0..65535
N/A
There are several sets
of measurement
configurations for the
same set of parameters
based on measurement
purposes.
ZTE Confidential Proprietary
57
Handover with LTE Handover
This parameter indicates
the filtering factor that is
used by a UE to perform
L3 filtering on
intra-frequency
measurement results.
On the UE side, a UE
performs L1
intra-frequency
measurement at a fixed
measurement cycle
(during which several
points are measured.
How L1 filters the
measurement result
depends on UEs.). After
that, L1 reports the
result to L3 at certain
time intervals and L3
performs filtering on the
latest measurement
result and the previous
measurement result.
The filtering shall be
performed based on the
URatEcNo
PrdMeas.Fi
lterCoeff
UTRAN Filter
Coefficient
following formula
specified in 3GPP TS
25.331: Fn = (1-a)*Fn-1
+a*Mn, in which:
0, 1, 2, 3, 4,
5, 6, 7, 8, 9,
11, 13, 15,
N/A
3
3
17, 19
Fn indicates the
currently filtered
measurement result;
Fn-1 indicates the
previously filtered
measurement result;
Mn indicates the latest
measurement result;
a = 1/2^ (k/2), in which k
is the filtering factor;
Note: If k is set to 0, no
L3 filtering is performed.
From the above formula,
the smaller the value of
the filtering factor is, the
ZTE Confidential Proprietary
greater impact the latest
measurement result has
on the measurement
result that is finally
58
Handover with LTE Handover
This parameter indicates
the filtering factor that is
used by a UE to perform
L3 filtering on EUTRAN
measurement results in
inter-RAT measurement.
On the UE side, a UE
performs L1 inter-RAT
measurement at a fixed
measurement cycle
(during which several
points are measured.
How L1 filters the
measurement result
depends on UEs.). After
that, L1 reports the
result to L3 at certain
time intervals and L3
performs filtering on the
latest measurement
result and the previous
measurement result.
The filtering shall be
performed based on the
URatEcNo
PrdMeas.
eUtranFilter
Coeff
EUTRAN
Filter
Coefficient
following formula
0, 1, 2, 3, 4,
specified in 3GPP TS
5, 6, 7, 8, 9,
25.331: Fn = (1-a)*Fn-1 11, 13, 15,
+a*Mn, in which:
N/A
3
3
17, 19
Fn indicates the
currently filtered
measurement result;
Fn-1 indicates the
previously filtered
measurement result;
Mn indicates the latest
measurement result;
a = 1/2^ (k/2), in which k
is the filtering factor;
Note: If k is set to 0, no
L3 filtering is performed.
From the above formula,
the smaller the value of
the filtering factor is, the
greater impact the latest
ZTE Confidential Proprietary
measurement result has
on the measurement
result that is finally
reported to an RNC (in
59
Handover with LTE Handover
This parameter indicates
the number of times that
periodical reports are
reported. A UE uses the
URatEcNo
PrdMeas.P
rdRptAmou
nt
Amount of
Reporting in
Period
Report
Criteria
parameter Amount of
reporting to determine
whether measurement
1, 2, 4, 8, 16,
N/A
Infinity
Infinity
N/A
1000
1000
This parameter indicates
System
System
the index number of
generates
generates
inter-RAT measurement
automatically. automatically.
reports are also needed. 32, 64, Infinity
If the UE detects that the
number of times of event
reporting exceeds the
value of the parameter,
it stops reporting
measurement reports.
(250, 500,
1000, 2000,
3000, 4000,
URatEcNo
PrdMeas.P
rdRptInterv
al
Reporting
Interval in
Period
Report
Criteria
This parameter indicates
the interval at which
periodical reports are
reported.
6000, 8000,
12000,
16000,
20000,
24000,
28000,
32000,
64000)ms
parameter
URatRscpP
rdMeas.Int
erRatCfgN
o
Inter-RAT
Measuremen
t
Configuratio
n Index
configurations. It is used
to index parameter
configuration sets for
inter-RAT measurement.
0..65535
N/A
There are several sets
of measurement
configurations for the
same set of parameters
based on measurement
purposes.
ZTE Confidential Proprietary
60
Handover with LTE Handover
This parameter indicates
the filtering factor that is
used by a UE to perform
L3 filtering on
intra-frequency
measurement results.
On the UE side, a UE
performs L1
intra-frequency
measurement at a fixed
measurement cycle
(during which several
points are measured.
How L1 filters the
measurement result
depends on UEs.). After
that, L1 reports the
result to L3 at certain
time intervals and L3
performs filtering on the
latest measurement
result and the previous
measurement result.
The filtering shall be
performed based on the
URatRscpP
rdMeas.Filt
erCoeff
UTRAN Filter
Coefficient
following formula
specified in 3GPP TS
25.331: Fn = (1-a)*Fn-1
+a*Mn, in which:
0, 1, 2, 3, 4,
5, 6, 7, 8, 9,
11, 13, 15,
N/A
3
3
17, 19
Fn indicates the
currently filtered
measurement result;
Fn-1 indicates the
previously filtered
measurement result;
Mn indicates the latest
measurement result;
a = 1/2^ (k/2), in which k
is the filtering factor;
Note: If k is set to 0, no
L3 filtering is performed.
From the above formula,
the smaller the value of
the filtering factor is, the
ZTE Confidential Proprietary
greater impact the latest
measurement result has
on the measurement
result that is finally
61
Handover with LTE Handover
This parameter indicates
the filtering factor that is
used by a UE to perform
L3 filtering on EUTRAN
measurement results in
inter-RAT measurement.
On the UE side, a UE
performs L1 inter-RAT
measurement at a fixed
measurement cycle
(during which several
points are measured.
How L1 filters the
measurement result
depends on UEs.). After
that, L1 reports the
result to L3 at certain
time intervals and L3
performs filtering on the
latest measurement
result and the previous
measurement result.
The filtering shall be
performed based on the
URatRscpP
rdMeas.
eUtranFilter
Coeff
EUTRAN
Filter
Coefficient
following formula
0, 1, 2, 3, 4,
specified in 3GPP TS
5, 6, 7, 8, 9,
25.331: Fn = (1-a)*Fn-1 11, 13, 15,
+a*Mn, in which:
N/A
3
3
17, 19
Fn indicates the
currently filtered
measurement result;
Fn-1 indicates the
previously filtered
measurement result;
Mn indicates the latest
measurement result;
a = 1/2^ (k/2), in which k
is the filtering factor;
Note: If k is set to 0, no
L3 filtering is performed.
From the above formula,
the smaller the value of
the filtering factor is, the
greater impact the latest
ZTE Confidential Proprietary
measurement result has
on the measurement
result that is finally
reported to an RNC (in
62
Handover with LTE Handover
This parameter indicates
the number of times that
periodical reports are
reported. A UE uses the
Amount of
URatRscpP Reporting in
rdMeas.Prd Period
RptAmount Report
Criteria
parameter Amount of
reporting to determine
whether measurement
1, 2, 4, 8, 16,
reports are also needed. 32, 64, Infinity
N/A
Infinity
Infinity
N/A
1000
1000
If the UE detects that the
number of times of event
reporting exceeds the
value of the parameter,
it stops reporting
measurement reports.
(250, 500,
1000, 2000,
3000, 4000,
Reporting
URatRscpP Interval in
rdMeas.Prd Period
RptInterval Report
Criteria
This parameter indicates
the interval at which
periodical reports are
reported.
6000, 8000,
12000,
16000,
20000,
24000,
28000,
32000,
64000)ms
4.3
EUTRAN Blacklist
Managed
Logic
Object
Name
Parameter Description
Value
Range
Unit
Default
Value
Recom
mende
d Value
This parameter indicates whether
Switch of
to enable the EUTRAN neighbor
support the cell blacklist function. If this
Eutran
function is enabled, the EUTRAN
Neighbourin cells which are forbidden to be
UtranCellF g cell
reselected or measured are
DD.Eutran blacklist
notified to the UE and the UE
NCblstSwc Switch
cannot search these cells. If this
h
function is disabled, such cells are
ZTE Confidential Proprietary
0: Off
N/A
0: Off
1: On
1: On
63
Handover with LTE Handover
Managed
Logic
Object
Name
Parameter Description
Value
Range
Unit
Default
Value
Recom
mende
d Value
not notified to the UE.
This parameter indicates whether
Switch of
support the
Eutran
Neighbourin
g cell
UENbrBlkLi
st
blacklist
Switch
.StateMode
to enable the EUTRAN neighbor
cell blacklist function. If this
function is enabled, the EUTRAN
cells which are forbidden to be
0: Off
reselected or measured are
1: On
N/A
0: Off
1: On
notified to the UE and the UE
cannot search these cells. If this
function is disabled, such cells are
not notified to the UE.
0: Band
1;
1: Band
2;
2: Band
3;
3: Band
4;
4: Band
5;
5: Band
6
6: Band
7;
7: Band
8;
8: Band
9;
9: Band
10;
10: Band
11;
Configur
11: Band
ation
12;
based
This parameter indicates the
12: Band
on
.EutranFre Band
frequency band of the EUTRAN
13;
requirem
qBandInd
cells.
13: Band N/A
UENbrBlkLi EUTRAN
st
ZTE Confidential Proprietary
Frequency
Indicator
-
ent
64
Handover with LTE Handover
Managed
Logic
Object
Name
Parameter Description
Value
Range
Unit
Default
Value
Recom
mende
d Value
14;
16: Band
17;
17: Band
18;
18: Band
19;
19: Band
20;
20: Band
21;
22: Band
23;
23: Band
24;
24: Band
25;
32: Band
33;
33: Band
34;
34: Band
35;
35: Band
36;
36: Band
37;
37: Band
38;
38: Band
39;
39: Band
40;
40: Band
41;
41: Band
42;
42: Band
ZTE Confidential Proprietary
65
Handover with LTE Handover
Managed
Logic
Object
Name
Parameter Description
Value
Range
Unit
Default
Value
Recom
mende
d Value
43;
This parameter indicates the
Band 1:
This
Band 1:
0-599,
paramet 0-599,
Band 2:
er
600-119
indicates 600-119
9,
the
Band 3:
downlink Band 3:
1200-19
E-UTRA 1200-19
49,
Absolute 49,
Band 4:
Radio
1950-23
Frequen 1950-23
99,
cy
Band 5:
Channel Band 5:
2400-26
Number 2400-26
49,
(EARFC 49,
Band 6:
N). The Band 6:
2650-27
calculati 2650-27
49,
on
Band 7:
formula Band 7:
2750-34
of the
2750-34
49,
center
49,
Band 8:
carrier
Band 8:
3450-37
frequenc 3450-37
99,
y is
Band 9:
F_DL = Band 9:
3800-41
F_DL_lo 3800-41
Band 2:
9,
Band 4:
99,
49,
99,
downlink E-UTRA Absolute Radio 49,
w + 0.1 * 49,
Frequency Channel Number
Band 10:
(N_DL – Band 10:
(EARFCN). The calculation
4150-47
N_Offs- 4150-47
formula of the center carrier
49,
Dl),
frequency is F_DL = F_DL_low + Band 11: Downlink where
49,
Band 11:
Downlink
0.1 * (N_DL – N_Offs-Dl), where 4750-49 EUTRAN F_DL is 4750-49
EUTRAN
F_DL is the center carrier
Absolute
frequency, F_DL_low is downlink Band 12: Radio
Radio
lowest carrier frequency, N_DL is 5000-51 Frequen carrier
99,
Absolute the
99,
Band 12:
5000-51
UENbrBlkLi Frequency
DlEARFCN, and N_Offs-Dl is the 79,
st
Channel
carrier frequency offset of the
Band 13: Channel y,
.earfcnDl
Number
frequency band.
5180-52 Number F_DL_lo 5180-52
ZTE Confidential Proprietary
cy
center
frequenc 79,
Band 13:
66
Handover with LTE Handover
Managed
Logic
Object
Name
ZTE Confidential Proprietary
Parameter Description
Value
Range
Unit
Default
Value
Recom
mende
d Value
79,
w is
Band 14:
downlink Band 14:
79,
5280-53
lowest
5280-53
79,
carrier
79,
Band 17:
frequenc Band 17:
5730-58
y, N_DL 5730-58
49,
is
Band 18:
DlEARF Band 18:
5850-59
CN, and 5850-59
99,
N_Offs- 99,
Band 19:
Dl is the Band 19:
6000-61
carrier
49,
frequenc 49,
Band 20:
y offset Band 20:
6150-64
of the
49,
frequenc 49,
Band 21:
y band. Band 21:
49,
6000-61
6150-64
6450-65
6450-65
99,
99,
Band 23:
Band 23:
7500-76
7500-76
99,
99,
Band 24:
Band 24:
7700-80
7700-80
39,
39,
Band 25:
Band 25:
8040-86
8040-86
89,
89,
Band 33:
Band 33:
36000-3
36000-3
6199,
6199,
Band 34:
Band 34:
36200-3
36200-3
6349,
6349,
Band 35:
Band 35:
36350-3
36350-3
6949,
6949,
Band 36:
Band 36:
67
Handover with LTE Handover
Managed
Logic
Object
Name
Parameter Description
Value
Range
Unit
Default
Value
Recom
mende
d Value
36950-3
36950-3
7549,
7549,
Band 37:
Band 37:
37550-3
37550-3
7749,
7749,
Band 38:
Band 38:
37750-3
37750-3
8249,
8249,
Band 39:
Band 39:
38250-3
38250-3
8649,
8649,
Band 40:
Band 40:
38650-3
38650-3
9649,
9649,
Band 41:
Band 41:
39650-4
39650-4
1589,
1589,
Band 42:
Band 42:
41590-4
41590-4
3589,
3589,
Band 43:
Band 43:
43590-4
43590-4
5589
5589
Configur
Number of
ation
UENbrBlkLi EUTRAN
st
Blacklist
based
This parameter indicates the
on
.NEutranNu Cells Per
number of EUTRAN neighbor cells
requirem
m
in the blacklist for each frequency. 1~16
Frequency
N/A
-
ent
N/A
N/A
N/A
The parameter is used to identify
an EUTRAN physical cell. There
are 504 physical cell IDs, which
are divided into 168 groups. Each
UENbrBlkLi
st
Physical
.NEutranCI EUTRAN
d[
ZTE Confidential Proprietary
group contains three physical cell
IDs. One physical cell ID can
Cell Identity belong to only one group.
0..503
68
Handover with LTE Handover
4.4
ZWF21-03-030 Load Based PS Handover to LTE
Managed
Logic
Object
Name
Parameter Description
Value
Range
Unit
Default
Value
Recom
mende
d Value
RNC Switch This parameter indicates the RNC
URncFuncti
on.loadTrg
U2LRncSwi
of Load
switch of load triggered UMTS to
Triggered
LTE handover. When the switch is 0: Off
Handover
on and the cell load is high, it will 1: On
1:On
from UMTS trigger the UE that support LTE
to LTE
handover or redirect to LTE.
Switch of
This parameter indicates the
UExtCelInf Load
switch of load triggered UMTS to
oFDD.load Triggered
LTE handover. When the switch is 0: Off
TrgUmts2Lt Handover
on and the cell load is high, it will 1: On
eSwi
0: Off
N/A
0: Off
N/A
1:On
from UMTS trigger the UE that support LTE
to LTE
handover or redirect to LTE.
Power
This parameter indicates the
Threshold for power threshold for releasing
UExtCelInf
oFDD.dlPw
rReleThrH
O2Lte
Releasing
from downlink high load for
from
load triggered handover from
Downlink
UMTS to LTE. When the cell
High Load
downlink load below this
for Load
threshold, the cell downlink
Triggered
load recovery to normal state,
Handover
the load triggered handover or
(0..100)
%, step
N/A
70
70
N/A
75
75
1%
from UMTS redirect to LTE should be
to LTE
Downlink
High Power
UExtCelInf Threshold for
oFDD.dlHig Load
hPwrThrH Triggered
O2Lte
Handover
from UMTS
to LTE
ZTE Confidential Proprietary
stopped.
This parameter indicates the
downlink high power threshold
for load triggered handover
from UMTS to LTE. When the
cell downlink load over or equal
to this threshold, the cell will be
high downlink load state, and it
(0..100)
%, step
1%
will trigger the UE handover or
redirect to LTE.
69
Handover with LTE Handover
RoT
This parameter indicates the
Threshold for RoT threshold for releasing
Releasing
from uplink high load for load
UExtCelInf from Uplink triggered handover from UMTS
oFDD.rotR High Load
to LTE. When the cell uplink
(0..62)d
eleaThrHO for Load
load below this threshold, the B, step
2Lte
Triggered
cell uplink load recovery to
Handover
normal state, the load triggered
dB
10
10
dB
12
12
8
8
5
5
0.1dB
from UMTS handover or redirect to LTE
to LTE
Uplink High
RoT
UExtCelInf Threshold for
oFDD.high Load
RotThrHO2 Triggered
Lte
Handover
from UMTS
to LTE
Period of
Load
URncInfo.lo Triggered
adTrg2LteP Handover or
eriod
Redirection
from UMTS
to LTE
Maximum
Number of
ULdCtrl.ul Uplink
MaxForHo Forced
Num
Handover
Users Every
Time
ZTE Confidential Proprietary
should be stopped.
This parameter indicates the
uplink high RoT threshold for
load triggered handover from
UMTS to LTE. When the cell
uplink RoT over or equal to this
threshold, the cell will be high
uplink load state, and it will
(0..62)d
B, step
0.1dB
trigger the UE handover or
redirect to LTE.
This parameter indicates the
period of load triggered
handover or redirection from
(0..100)
UMTS to LTE. When the cell is s, step
S
in high load state, it will choose 1s
the UE periodically handover or
redirect to LTE, this parameter
is the period.
This parameter indicates the
maximum number of selected UEs
that are forcibly handed over each 1..50
time when the forced handover
N/A
scheme is executed for uplink load
reduction.
70
Handover with LTE Handover
Maximum
Number of
Downlink
ULdCtrl.dl Forced
MaxForHo Handover
Num
Users or
Deleted
Radio Links
Every Time
This parameter indicates the
maximum number of UEs selected
for forced handover or the
maximum number of radio links
1..50
selected for deletion each time
3
handover or link deletion function
is performed for load reduction.
Related Counters and Alarms
5.1
ZWF21-03-110 UMTS-LTE Handover
Counter List
Counter ID
312106776
310086973
5.2
3
when the downlink forced
5
Table 5-1
N/A
Name
Number of attempted relocation preparation for outgoing
PS inter-RAT handovers(Utran to EUtran)
Number of RRC connection release for redirection
ZWF21-03-030 Load Based PS Handover to LTE
Table 5-2
Counter List
Counter ID
C314087172
C312107173
C312107174
ZTE Confidential Proprietary
Name
Number of RRC connection release for redirection to
LTE,cause by cell load
Number of attempted outgoing PS inter-RAT
handovers(Utran to EUtran),cause by cell load
Number of successful outgoing PS inter-RAT
handovers(Utran to EUtran),cause by cell load
71
Handover with LTE Handover
6
Engineering Guide
6.1
Application Scenario
This feature is mainly applicable to the UMTS-LTE co-existing networking scenarios.
To support PS handovers between UTRAN and EUTRAN, and ensure continuous PS
services, the UE should be handed over or redirected to the LTE in the case of poor
UMTS coverage or high load. It is recommended to activate this feature in the network
where LTE is deployed, to increase the possibility of a UE to be provided with services by
the LTE network.
However, in the preliminary stage of LTE network deployment, if the UE has limited
capability, an RRC connection redirection should be used to ensure that the UE can be
successfully handed over to the LTE system.
6.2
Feature Activation Procedure
The purpose of this chapter is just to guide the reader how to find the GUI location of the
parameters which are related to the deployment of this feature. The values indicated by
the captures possibly are not the real value to configure. Please refer to the last column
of table in chapter 4 for the practical configuration value.
6.2.1
UMTS-LTE Handover
In the configuration resource tree window, open the [Modify Area->Managed Element->
UMTS Logical Function Configuration->PLMN Relating Configuration->Logic RNC
Configuration] interface and set the parameter “RNC Switch for PS Handover with LTE”,
as shown in Figure 6-1.
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Figure 6-1
Parameters configuration interface 1
In the configuration resource tree window, open the [Modify Area->Managed Element->
UMTS Logical Function Configuration->Logic RNC Configuration] interface and set the
parameter “RNC Switch for PS Redirection with LTE”, as shown in Figure 6-2.
Figure 6-2
Parameters configuration interface 2
In the configuration resource tree window, open the [Modify Area->Managed Element->
UMTS Logical Function Configuration->UTRAN Cell->Extended Info of UTRAN Cell]
interface and set the parameter “Inter Frequency or Inter RAT Handover Switch”, “Choice
Strategy in Multi-RAT Handover”, as shown in Figure 6-3.
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Figure 6-3
Parameters configuration interface 3
In the configuration resource tree window, open the [Modify Area->Managed Element->
UMTS Logical Function Configuration->Extended Info of RNC] interface and set the
parameter “Switch of checking the UE E-UTRA Capability”, as shown in Figure 6-4.
Figure 6-4
Parameters configuration interface 4
In the configuration resource tree window, open the [Modify Area->Managed Element->
UMTS Logical Function Configuration->Link Configuration->Iups Link] interface and set
the parameter “Method of Identify EUtran cell”, as shown in Figure 6-5.
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Figure 6-5
Parameters configuration interface 5
In the configuration resource tree window, open the [Modify Area->Managed Element->
UMTS Logical Function Configuration->Logic RNC Configuration] interface and set the
parameter “R99 RT Inter Rat(EUTRAN) Handover Switch”, “R99 NRT Inter Rat(EUTRAN)
Handover Switch”, “HSDPA Inter Rat(EUTRAN) Handover Switch”, “HSUPA Inter
Rat(EUTRAN) Handover Switch”, as shown in Figure 6-6.
Figure 6-6
Parameters configuration interface 6
In the configuration resource tree window, open the [Modify Area->Managed Element->
UMTS Logical Function Configuration] interface and set the parameter “The Time
Threshold that the RNC May Resend the MEASUREMENT CONTROL RELEASE”, as
shown in Figure 6-7.
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Figure 6-7
Parameters configuration interface 7
In the configuration resource tree window, open the [Modify Area->Managed Element->
UMTS Logical Function Configuration->UTRAN Cell] interface and set the parameter
“Inter-RAT Handover Tactic”, as shown in Figure 6-8.
Figure 6-8
Parameters configuration interface 8
In the configuration resource tree window, open the [Modify Area->Managed Element->
UMTS Logical Function Configuration->PLMN Relating Configuration->Logic RNC
Configuration] interface and set the parameter “Compressed Mode Configuration
Strategy”, as shown in Figure 6-9.
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Figure 6-9
Parameters configuration interface 9
In the configuration resource tree window, open the [Modify Area->Managed Element->
UMTS Logical Function Configuration->UTRAN Cell->Extended Info of UTRAN Cell]
interface and set the parameter “Time To Trigger for Inter-frequency and Inter-Rat Period
Measurement”, as shown in Figure 6-10.
Figure 6-10 Parameters configuration interface 10
6.2.2
UMTS-LTE Handover Measurement
In the configuration resource tree window, open the [Modify Area->Managed Element->
UMTS
Logical
Function
Configuration->Service
Configuration->Measurement
Configuration->Inter-RAT Measurement Profile] interface and set the parameter
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“Inter-Rat Measurement Profile Identity”, “Mobility Configuration Scene”, as shown in
Figure 6-11.
Figure 6-11 Parameters configuration interface 11
In the configuration resource tree window, open the [Modify Area->Managed Element->
UMTS Logical Function Configuration->UTRAN Cell] interface and set the parameter
“UTRAN Measurement Quantity for Inter-frequency and Inter-RAT Measurements”, as
shown in Figure 6-12.
Figure 6-12 Parameters configuration interface 12
In the configuration resource tree window, open the [Modify Area->Managed Element->
UMTS
Logical
Function
Configuration->Service
Configuration->Measurement
Configuration->Inter-RAT Measurement-> Profile Logic RNC Configuration] interface and
set the parameter “Service and Bearer Type Used for Differentiating Handover
Configuration”, as shown in Figure 6-13.
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Figure 6-13 Parameters configuration interface 13
In the configuration resource tree window, open the [Modify Area->Managed Element->
UMTS Logical Function Configuration->UTRAN Cell] interface and set the parameter
“Used Inter-RAT Measurement Profile”, as shown in Figure 6-14.
Figure 6-14 Parameters configuration interface 14
In the configuration resource tree window, open the [Modify Area->Managed Element->
UMTS
Logical
Function
Configuration->Service
Configuration->Measurement
Configuration->Inter-RAT Measurement-> Profile Logic RNC Configuration] interface and
set the parameter “Inter-RAT Measurement Configuration Index”, “UTRAN Filter
Coefficient”, “EUTRAN Filter Coefficient”, “Inter-RAT Measurement Event Number”,
“Inter-RAT Event Identity”, “Absolute Threshold of the Quality of UTRAN Cell for 3A”,
“Weight of the UTRAN System for 3A”, “Absolute Threshold of the Quality of Other RAT
for 3A/3B/3C”, “Hysteresis”, “Time To Trigger”, as shown in Figure 6-15.
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Figure 6-15 Parameters configuration interface 15
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In the configuration resource tree window, open the [Modify Area->Managed Element->
UMTS
Logical
Function
Configuration->Service
Configuration->Measurement
Configuration->Inter-RAT Measurement-> Profile Logic RNC Configuration] interface and
set the parameter “Inter-RAT Measurement Configuration Index”, “UTRAN Filter
Coefficient”, “EUTRAN Filter Coefficient”, “Inter-RAT Measurement Event Number”,
“Inter-RAT Event Identity”, “Absolute Threshold of the Quality of UTRAN Cell for 3A”,
“Weight of the UTRAN System for 3A”, “Absolute Threshold of the Quality of Other RAT
for 3A/3B/3C”, “Hysteresis”, “Time To Trigger”, as shown in Figure 6-16.
Figure 6-16 Parameters configuration interface 16
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In the configuration resource tree window, open the [Modify Area->Managed Element->
UMTS
Logical
Function
Configuration->Service
Configuration->Measurement
Configuration->Inter-RAT Measurement-> Profile Logic RNC Configuration] interface and
set the parameter “Inter-RAT Measurement Configuration Index”, “UTRAN Filter
Coefficient”, “EUTRAN Filter Coefficient”, “Amount of Reporting in Period Report Criteria”,
“Reporting Interval”, as shown in Figure 6-17.
Figure 6-17 Parameters configuration interface 17
In the configuration resource tree window, open the [Modify Area->Managed Element->
UMTS
Logical
Function
Configuration->Service
Configuration->Measurement
Configuration->Inter-RAT Measurement-> Profile Logic RNC Configuration] interface and
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set the parameter “Inter-RAT Measurement Configuration Index”, “UTRAN Filter
Coefficient”, “EUTRAN Filter Coefficient”, “Amount of Reporting in Period Report Criteria”,
“Reporting Interval”, as shown in Figure 6-18.
Figure 6-18 Parameters configuration interface 18
6.2.3
EUTRAN Blacklist
In the configuration resource tree window, open the [Modify Area->Managed Element->
UMTS Logical Function Configuration->UTRAN Cell] interface and set the parameter
“Switch of support the Eutran Neighbouring cell blacklist”, as shown in Figure 6-19.
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Figure 6-19 Parameters configuration interface 19
In the configuration resource tree window, open the [Modify Area->Managed
Element->UMTS Logical Function Configuration->UTRAN Cell->Adjacent Relation
Configuration->Eutran Neighbouring Cell Black List] interface and set the parameter
“State Indicator Used for EUTRAN Blacklist Cell Configuration”, “EUTRAN Frequency
Band Indicator”, “Downlink EUTRAN Absolute Radio Frequency Channel Number”,
“Number of EUTRAN Blacklist Cell Per Frequency” and “Physical EUTRAN Cell
Identity”as shown in Figure 6-20.
Figure 6-20 Parameters configuration interface 20
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6.2.4
Load Based PS Handover to LTE
In the configuration resource tree window, open the [Modify Area->Managed
Element->UMTS Logical Function Configuration] interface and set the parameter “RNC
Switch of Load Triggered Handover from UMTS to LTE” as shown in Figure 6-21
Figure 6-21 Parameters configuration interface 21
In the configuration resource tree window, open the [Modify Area->Managed Element->
UMTS Logical Function Configuration->UTRAN Cell->Extened Information 2 of ETRAN
Cell] interface and set the parameter “Switch of Load Triggered Handover from UMTS to
LTE”,
as shown in Figure 6-22
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Figure 6-22 Parameters configuration interface 22
In the configuration resource tree window, open the [Modify Area->Managed Element->
UMTS Logical Function Configuration->UTRAN Cell->Extened Information 2 of ETRAN
Cell] interface and set the parameter “Power Threshold for Releasing from Downlink
High Load for Load Triggered Handover from UMTS to LTE(%)”,
as shown in Figure
6-23
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Figure 6-23 Parameters configuration interface 23
In the configuration resource tree window, open the [Modify Area->Managed Element->
UMTS Logical Function Configuration-> UTRAN Cell->] interface and set the parameter
“Period of Load Triggered Handover or Redirection from UMTS to LTE(s)”,
as shown in
Figure 6-24
Figure 6-24 Parameters configuration interface 24
In the configuration resource tree window, open the [Modify Area->Managed Element->
UMTS Logical Function Configuration->UTRAN Cell->Load Control Information] interface
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and set the parameter “Maximum Number of Uplink Forced Handover Users Every Time”,
“Maximum Number of Downlink Forced Handover Users or Deleted Radio Links Every
Time”, as shown in Figure 6-25
Figure 6-25
Parameters configuration interface 25
6.3
Feature Validation Procedure
6.3.1
ZWF21-03-110 UMTS-LTE Handover
Table 6-1
Feature Validation Procedure 1
Test Item
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Test Item
Handover with LTE
1.
WCDMA system is ready.
2.
Cell1 support HSUPA, HSDPA and DCH. Cell1 belongs to
RNC1/NodeB1, Cell2 belongs to LTE.
Preconditio
ns
3.
Configure Cell1 and Cell2 adjacent cells with different coverage.
4.
UE1 with R8 or higher version supports both of WCDMA and LTE
and camps on Cell1 in Idle mode.
1.
UE1 makes a PS call in cell1 and start FTP downloading.
2.
UE1 moves from Cell1 to Cell2 and triggers handover.
3.
UE1 moves from Cell2 to Cell1and triggers handover.
4.
Release the PS call.
1.
In step2 and step3, UE1 performs the handover procedure
Test Steps
Anticipative
Result
6.3.2
successfully.
EUTRAN blacklist
Table 6-2
Feature Validation Procedure 2
Test Item
Handover with LTE with blacklist
1.
WCDMA system is ready.
2.
Cell1 support HSUPA, HSDPA and DCH. Cell1 belongs to
RNC1/NodeB1, Cell2 and Cell3 belong to LTE.
Preconditio
ns
3.
Configures Cell1 with Cell2, Cell3 adjacent cells with different
coverage. Set the Cell3 on the blacklist.
4.
UE1 with R8 or higher version supports both of WCDMA and LTE
and camps on Cell1 in Idle mode.
1.
UE1 makes a PS call in cell1 and start FTP downloading.
2.
UE1 moves from Cell1 to Cell3
3.
UE1 moves from Cell1 to Cell2.
4.
Release the PS call.
Test Steps
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Test Item
Handover with LTE with blacklist
1.
Anticipative
measurement report.
Result
2.
6.3.3
In step2, UE can’t measure the Cell3. It did not send the
In step3, UE1 performs the handover to Cell2 successfully.
Load Based PS Handover to LTE
Table 6-3
Feature Validation Procedure 3
Test Item
Handover with LTE
1.
WCDMA system is ready.
2.
Cell1 support HSUPA, HSDPA and DCH. Cell1 belongs to
RNC1/NodeB1, Cell2 belongs to LTE.
3.
Preconditio
Configures Cell1 and Cell2 as adjacent cells with different
coverage.
ns
4.
Configure RNC support the function of handover with LTE based
on load.
5.
UE1 with R8 or higher versions supports both of WCDMA and LTE
and camps on Cell1 in Idle mode.
1.
UE1 makes a PS call in Cell1 and start FTP downloading.
2.
When the Cell1 is in high load status, UE begin to start activating
EUTRAN compressed mode and measurement.
Test Steps
3.
Enhance the signal of EUTRAN Cell2, UE1 reports 3C event and
handover is triggered.
4.
Anticipative
Result
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Release the PS call.
1. In step3, UE1 performs the handover procedure successfully..
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6.4
Feature Deactivation Procedure
6.4.1
ZWF21-03-110 UMTS-LTE Handover
Table 6-4
RNC parameter list 1
Managed Object.
logic name
GUI Name
ULogicalRnc.RncPs
RNC Switch for PS
HoLteSw
Handover with LTE
ULogicalRnc.RncPs
RNC Switch for PS
RediLteSw
Redirection with LTE
URncInfo.CheEutraC
Switch of checking the
apiSw
UE E-UTRA Capability
ULogicalRnc.r99RtE
utraHoSw
R99 RT Inter Rat
Default Value
Deactivation
Value
0:Off
0:Off
0:Off
0:Off
0:Off
0:Off
1:On
0:Off
1:On
0:Off
1:On
0:Off
1:On
0:Off
(EUTRAN) Handover
Switch
ULogicalRnc.r99NrtE
traHoSw
R99 NRT Inter Rat
(EUTRAN) Handover
Switch
ULogicalRnc.hsdpaE
utraHoSw
HSDPA Inter Rat
(EUTRAN) Handover
Switch
ULogicalRnc.hsupaE
utraHoSw
HSUPA Inter Rat
(EUTRAN) Handover
Switch
For the above parameters’ description and configuration, please refer to chapter 6.2.
6.4.2
EUTRAN blacklist
Table 6-5
RNC parameter list 2
Managed Object.
logic name
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Default Value
Deactivation
Value
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Managed Object.
GUI Name
logic name
Default Value
Deactivation
Value
Switch of support the
UtranCellFDD.Eutran
Eutran Neighbouring
NCblstSwch
cell blacklist Switch
0:Off
0:Off
For the above parameters’ description and configuration, please refer to chapter 6.2.
6.4.3
Load Based PS Handover to LTE
Table 6-6
RNC parameter list 3
Managed Object.
GUI Name
logic name
URncFunction.loadTr
gU2LRncSwi
UExtCelInfoFDD.loa
dTrgUmts2LteSwi
Default Value
Deactivation
Value
RNC Switch of Load
Triggered Handover
0:Off
0:Off
0:Off
0:Off
from UMTS to LTE
Switch of Load
Triggered Handover
from UMTS to LTE
For the above parameters’ description and configuration, please refer to chapter 6.2.
6.5
Network Impact
6.5.1
ZWF21-03-110 UMTS-LTE Handover
Effect on system equipment:
None
Effect on network KPIs:
Activating this feature, the advantage is:
If the UE who has established data in the UMTS network moves to cell edge, it can be
handed over or redirected to the LTE network to ensure continuous services and improve
user experience.
The PS handover to EUTRAN costs little service interruption time because of small
handover delay.
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The redirection to EUTRAN has perfect compatibility on terminals, which means that
even if the UE is incapable of supporting the handover procedure to LTE, it still can be
provided with services by the LTE network after being redirected. The redirection to LTE
is more widely used at the preliminary stage of LTE deployment because it requires less
UE capabilities.
The disadvantage is:
The PS handover to EUTRAN may fail in the case of poor service quality. Also, if the UE
is incapable of supporting PS handover, the handover cannot be performed.
The redirection to EUTRAN has longer handover delay comparing with the PS handover.
6.5.2
ZWF21-03-030 Load Based PS Handover to LTE
Effect on system equipment:
None
Effect on network KPIs:
Activating this feature, the advantage is:
When UMTS is high load, the RNC handovers or redirects the UEs to LTE to
relieve the load of UMTS network and guarantee system stable.
The disadvantage is:
7
NoneAbbreviation
Abbreviations
Full Characteristics
3GPP
3rd Generation Partnership Project
CS
Circuit Switch
EUTRAN
Evolved Universal Terrestrial Radio Access Network
KPI
Key Performance Indicator
LTE
Long Term Evolution
PS
Packet Switch
RNC
Radio Network Controller
SRNC
Serving Radio Network Controller
UMTS
Universal Mobile Telecommunications System
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UTRAN
8
UMTS Terrestrial radio access network
Reference Document
[1] ZTE UMTS Handover Control Feature Guide
[2] ZTE UMTS Fast Return to LTE Feature Guide
[3] ZTE UMTS SR-VCC Feature Guide
[4] ZTE UMTS Quality Based Handover Feature Guide
[5] ZTE UMTS Transmitted Power Based Handover Feature Guide
[6] ZTE UMTS Load Adaptive Power Control Feature Guide
[7]ZTE UMTS QOS Guarantee Feature Guide
[8] ZXUR 9000 UMTS (V4.14.10.14) Radio Network Controller Radio Parameter
Reference
[9] ZXWR RNC (V3.14.10.14) Radio Network Controller Radio Parameter Reference
[10] ZXUR 9000 UMTS (V4.14.10.14) Radio Network Controller Performance Counter
Reference
[11] ZXWR RNC (V4.14.10.14) Radio Network Controller Radio Parameter Reference
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