Basics

1RBS = 3BTS (BTS covers 1 sector cell)

1RBS can handle up to 12 TRXs (1TRX means 1 frequency)

An MO is a logical representation of HW unit and SW of the BTS in the BSC

In most cases one TG handles one RBS

One TG can consist of up to 16 frequencies

TRU (RBS2000) stands for transceiver group, 1 TRU handles one frequency, which
consist of 8 timeslots, each timeslot needs 16kbps bandwidth

AXE BSC :

RL… commands used for cell handling

RX… commands used for managed object handling
Managed objects Block Diagram
1.Transceiver
Group (TG)
2.Central Function (CF)
3.Digital Path (DP)
4.Concentrator (CON)
5.Transceiver Controller (TRX)
6.Transmitter (TX)
7.Receiver (RX)
8.Interface Switch (IS)
9.Timing Function (TF)
10.Time Slots (TS)
DP
CF
TF
RX
TRXC
0
TX
TS
0
IS
( UP TO 16 TRXCs)
TS
7
8 TS
TS
7
8 TS
RX
TRXC
15
TX
TS
0
CON
Managed object block diagram RBS2000 (G12)
Managed object block diagram RBS200 (G01)
9702380
RBS 2000 family
RBS 2206 Hardware overview
DXU-21 Distribution Switch Unit


DXU

Central control unit for RBS

Flashcard makes it possible to change a faulty DXU card, without the need for loading RBS
software from the BSC

OMT is the RBS configuration tool. All the RBS configuration data and the software stored
in flash memory card (size: 32Mb). Configuration file: ldb.dbb.
Distribution Switch Unit Functions

CF Central Function: the control part of a TG. The BSC communicates with the CF using
layer 2 LAPD, address: TEI = 62.

CON LAPD concentration for RBS 2000.

IS Interworking Switch: system interface to the 2 Mbit/s link, connects time slots to
transceivers.

TF Timing Function, synchronization with PCM link and generates a timing reference for the
RBS.

DP Digital Path, Layer 1, each of the PCM systems terminating in TG has an associated
supervision object, the DP.
dTRU – double Transceiver Unit

Contains 2 TRXs for transmission and reception of carriers.

built-in combiner with the possibility of combining two TX signals into
one output.

Prepared for RX diversity

dTRU - Transceiver Unit functions

TRXC The transceiver controller is controlling all the functions for
signal processing, Radio receiving and Radio Transmitting.

RX The receiver provides the
functionality for one transceiver.

TX The transmitter provides the radio frequency transmission
functionality on a time slot basis for eight TSs using different time
slot numbers.
radio
frequency
reception
CDU & CXU

Combiners (CDU)

Interface between the transceivers (TRU) and the antenna system.

Signals are filtered before transmission and after reception with bandpass
filters.

RBS 2206 maximum 3 CDU

CDU-F used for high capacity solutions (Baseband hopping)

CDU-G is the most common used, it can be configured either for high
capacity or high coverage. It supports synthesizer hopping

Configuration Switch Unit (CXU)

Distributes the RX signal from CDU to dTRUs

Built up SW controlled switches

Makes it possible to reconfigure a cabinet without cable moving
Other Hardware Units

Standard HW units










ACCU-01: AC connection unit
DCCU: DC Connection unit
FCU: Fan Control Unit
IDM Distributes the internal 24V+ DC power to all other units
PSU Power Supply unit
DC filter
Battery Fuse unit (outdoor cabinets)
Climate unit
EPC bus: optical cable bus, for alarm signaling
Optional HW units







ASU (Antenna Sharing unit) is for co-siting, when other cabinet used together with the
RBS 2206 in the same sector
BBS battery backup system from external cabinet
ddTMA improves the receiver sensitivity, duplexing the RX and TX signals to the same
feeder cable. Power supply provided for TMA by bias injector.
DF: over voltage protector for external alarm cables
ESB is used for TG synchronization to expand one RBS cabinet with another RBS in the
same cell
HCU contains 3 hybrid combiners. Each hybrid combines 2 RF signals, delivered from
2dTRU into one
Battery backup, DC/DC converter, DC filter, Smoke detector, Transport module
RBS 2206 configurations with CDU-G
TG sync & Cascade mode




TG sync: More than 1 cabinet in one cell
Master / Slave mode used (RXMOI: TFMODE
parameter)
TFCOMPPOS is the distribution delay between the
master and slave TG , value depends on the
cablelenght. OMT able to calculate.
Cascade mode used when only 1 PCM available
for 2 RBSs
1 PCM
Cascade
mode
2 PCMs no
cascade mode
RBS0
RBS1
RBS0
RBS1
TFMODE
M
S
M
S
TEI
62
61
62
62
TFCOMPOSS
OMT
OMT
OMT
OMT
2 RBS in cascade mode with TG
sync
Cell data definition

A cell can be internal or external.

External cells: certain data must be known in order to carry out a handover from a
cell in its own BSC to a cell controlled by another BSC.

Useful cell handling commands:










RLDEI:CELL=cell, CSYSTYPE=[GSM900, GSM1800, GSM800, GSM1900], ext;
RLDEC: CELL=cell, CGI=cgi, BSIC=bsic, BCCHNO=bcchno,
NEWNAME=newname, AGBLK=agblk, MFRMS=mfrms, BCCHTYPE=bcchtype,
FNOFFSET=fnoffset, XRANGE=xrange;
Cell Power data configure, print: RLCPC, RLCPP
Cell Frequency and hopping data print: RLCFC, RLCHP
Channel group configuration, change RLDGI, RLCCC
Cell data print: RLDEP:CELL=xxxx;
Cell status: RLSTP:CELL=xxxx;
Cell Resource RLCRP:CELL=xxxx,DETAIL;
Cell removing: RLDEE:CELL=xxxx;
Cell neighbor relation print: RLNRP:CELL=xxxx,cellr=all,nodata;
BTS logical configuration
RBS
A-bis
TG=Transceiver Group
CF=Central Function
IS=Interface Switch
TF=Timing Function
CON=Connector
RXOTG-99
RXODP-99-0
RXODP-99-1
RXOCON-99-0
DXU (hw)
RXOIS-99
RXOTF-99
RXOCF-99
TRU (hw)
RXOTRX-99
RXOTX-99-0
RXORX-99-0
TRU (hw)
RXOTRX-99
RXOTX-99-1
RXORX-99-1
RXOTS-99-0-0
RXOTS-99-0-1
RXOTS-99-0-2
RXOTS-99-0-3
RXOTS-99-0-4
RXOTS-99-0-5
RXOTS-99-0-6
RXOTS-99-0-7
RXOTS-99-1-0
RXOTS-99-1-1
RXOTS-99-1-2
RXOTS-99-1-3
RXOTS-99-1-4
RXOTS-99-1-5
RXOTS-99-1-6
RXOTS-99-1-7
DP=Digital Path
TRX = Transceiver
TX = Transmission
RX=Receiver
TS=Timeslot
Managed objects definition








RXMOI:MO=RXOTG-99,COMB=HYB,RSITE=MUCSAROCSOGE, SWVER=B4402R009V;
RXMOC:MO=RXOTG-99,FHOP=SY,TRACO=POOL;
RXMOC:MO=RXOTG-99,CONFACT=2,ABISALLOC=FLEXIBLE,CONFMD=MINDIST,AHOP=OFF;
RXMOC:MO=RXOTG-99,ABIS64KTHR=0;
RXMOI:MO=RXOTF-99,TFMODE=SA;
RXMOI:MO=RXOCF-99,TEI=62,SIG=CONC;
RXMOI:MO=RXOIS-99;
RXMOI:MO=RXOCON-99,DCP=64&&87;





RXMOI:MO=RXOTRX-99-0,TEI=0,DCP1=178,DCP2=179&&186;
RXMOC:MO=RXOTRX-99-0,CELL=41772A,SIG=CONC;
RXMOI:MO=RXORX-99-0,RXD=AB,BAND=GSM900;
RXMOI:MO=RXOTX-99-0,BAND=GSM900,MPWR=47;
RXMOC:MO=RXOTX-99-0,CELL=41772A;






RXMOI:MO=RXOTS-99-0-0&&-7;
RXMOI:MO=RXOTRX-99-1,TEI=1,DCP1=187,DCP2=188&&195;
RXMOC:MO=RXOTRX-99-1,CELL=41772A,SIG=CONC;
RXMOI:MO=RXORX-99-1,RXD=AB,BAND=GSM900;
RXMOI:MO=RXOTX-99-1,BAND=GSM900,MPWR=47;
RXMOC:MO=RXOTX-99-1,CELL=41772A;

RXMOI:MO=RXOTS-99-1-0&&-7;
Managed Objects States
Cell activation

1. Connect transmission





RXAPI:MO=RXOTG-1,DEV=RBLT3-33&&-63,DCP=1&&31;
RXAPP:MO=RXOTG-1;
DTBLE:DIP=1RBL3;
BLODE:DEV=RBLT3-33&&-63;
2. Deblocking of managed objects

RXESI:MO=RXOTG-0, SUBORD;
(It can take a few minutes, especially when flash card is not pre-loaded with the BTS software)


3. Activate Cell


RXBLE:MO=RXOTG-0, SUBORD;
RLSTC:CELL=41772A,STATE=ACTIVE;
4. Check cell data



RXCDP:MO=RXOTG-1;
RLCRP:CELL=41772A;
RXMFP:MO=RXOTG-1,SUBORD,FAULTY;
Check cell resources

RLCRP:CELL=ALL; shows some cells are down:
<RLCRP:CELL=ALL;
CELL RESOURCES
CELL
BCCH
FUR138C
1
FUR138B
1
FUR138A
1
GA4134C
0
GA4134B
0
GA4134A
0
FUR138A
1
PSA135C
1
PSA135B
1
…




CBCH SDCCH NOOFTCH
1
7 12- 24
1
7 14- 28
1
7 14- 28
0
0
0
0
0
0
0
0
0
1
7 14- 28
1
7 14- 28
1
7 14- 28
…
…
RLCRP:CELL=ALL; shows some cells are down.
RLCRP lists only cells in active state
Command can be used RLCRP:CELL=ALL,detailed; switch, for more information
When using this command for one cell detailed information will be printed automatically
Check alarms and find TG

An easy way to recognize a cell without all resources available to run ALLIP or
ALLIP:PRCA=43;
<allip:prca=43;
ALARM LIST
A2/APT "GABSC41_E000B00" 122 040329
2152
CELL LOGICAL CHANNEL AVAILABILITY SUPERVISION
CELL
SCTYPE
CHTYPE
CHRATE
SPV
GA4134C
OL
TCH
FR
1
TCH
FR
2
RADIO X-CEIVER ADMINISTRATION
MANAGED OBJECT FAULT
MO
RXOCF-15
END

RSITE
ALARM SLOGAN
WILTON_HOSPITAL LOCAL MODE
Find out which TG is connected to the cell, use RXTCP:cell=GA4134C,moty=RXOTG;
<rxtcp:cell=GA4134c,Moty=rxotg;
RADIO X-CEIVER ADMINISTRATION
TG TO CHANNEL GROUP CONNECTION DATA
MO
RXOTG-204
END
CELL
GA4134C
GA4134C
CHGR
0
1
Re-activate the cell
The workaround in this case to halt cell, block and take MOs out of service, and then
activate everything again.
Halt the cell (Cell restriction active alarm will present):
RLSTC: CELL=GA4134C,STATE=HALTED;
Block and take out of service MOs for TG:
RXBLI: MO=RXOTG-204,SUBORD,FORCE;
RXESE: MO=RXOTG-204,SUBORD;
Take in service and deblock MOs for the TG:
RXESI: MO=RXOTG-204,SUBORD; (This command needs a few minutes to be executed)
RXBLE: MO=RXOTG-204,SUBORD;
Activate cell:
RLSTC: CELL=GA4134C,STATE=ACTIVE;
Check resources
<rlcrp:cell=GA4134C;
CELL RESOURCES
CELL
GA4134C
CHGR
0
BCCH
1
CBCH
0
SDCCH
8
NOOFTCH
27- 54
BPC
6017
CHANNEL
TCH-1794
TCH-11749
TCH-11748
CHRATE
FR
HR
HR
SPV
1,2,3
1,3
1,3
STATE
IDLE
IDLE
IDLE
959
TCH-2529
TCH-13219
TCH-13218
TCH-2530
TCH-13221
TCH-13220
TCH-2531
TCH-13223
TCH-13222
FR
HR
HR
FR
HR
HR
FR
HR
HR
1,2,3
1,3
1,3
1,2,3
1,3
1,3
1,2,3
1,3
1,3
BLOC
BLOC
BLOC
IDLE
IDLE
IDLE
IDLE
IDLE
IDLE
ICMBAND
1
1
1
CHBAND
800
800
800
64K
NONE
.
.
.
960
961
EGPRS
1
1
1
1
1
1
800
800
800
800
800
800
EGPRS
EGPRS
.
.
.
END

Check available resources for the alarmed cell with RLCRP:cell=GA4134C;
Verify BPC
<rlbdp:cell=GA4134C;
CELL CONFIGURATION BPC DATA
CELL
GA4134C
CHGR
0
1
END




NUMREQBPC
8
24
NUMREQEGPRSBPC
0
3
NUMREQCS3CS4BPC
0
0
TN7BCCH
GPRS
The number of BPC should be the same as the sum of the resources.
BPC = BCCH(1) + TCH (27) + SDCCH/8 (8/8) = 29 <> 32
CHGR: a group of frequencies handled in the same way within one cell. Channel
group 0 contains the Broadcast Control Channel (BCCH)
1 BPC (Basic Physical Channel) means 1 timeslot in 1 carrier.
Check the configuration of the TG
<rxcdp:mo=rxotg-204;
RADIO X-CEIVER ADMINISTRATION
MANAGED OBJECT CONFIGURATION DATA
MO
RXORX-204-0
RXORX-204-1
.
MO
ICM
.
RXOTS-204-9-1
RXOTS-204-9-2
RXOTS-204-9-3
.
MO
RXOTX-204-0
RXOTX-204-1
.
RXOTX-204-8
RXOTX-204-9
RXOTX-204-10
.
MO
RXODP-204-0
RESULT
CONFIG
CONFIG
.
RESULT
ARFCN
HOP
HOP
.
ARFCN
CONFIG
BLOCKED
BLOCKED
.
RESULT
CONFIG
CONFIG
.
CONFIG
CONFIG
CONFIG
.
RESULT
CONFIG
HOP
INSUFFICIENT TRX EQUIPMENT
END
.
ARFCN
206
HOP
.
HOP
HOP
203
.
SBITS
MISMATCH
NONE
NONE
.
TXAD TN
4
.
TXAD
2
9
.
3
4
0
N1
320
BPC
6
CHCOMB
960
OFFS
TCH
BSPWR
45
45
C0F
YES
NO
MISMATCH
NONE
NONE
43
43
43
NO
NO
YES
NONE
NONE
NONE
N3
N4
0
XRA
NO
ON
Check MO state
<rxmsp:mo=rxotg-204,SUBORD;!status BTS!
RADIO X-CEIVER ADMINISTRATION
MANAGED OBJECT STATUS
MO
RXOTG-204
RXOCF-204
...
RXOTS-204-9-2
RXOTS-204-9-3
...
STATE
OPER
OPER
BLSTATE
BLO
0000
0000
BLA
0000
0000
LMO
BTS
STA
STA
CONF
COM
COM
MBL
MBL
0000
0000
0202
0202
0940
0940
DIS
DIS
UNCONF
UNCONF
The command RXMSP with the parameters “SUBORD” give us the information about the
status of all the MO in the TG. There are two Time slots (RXOTS-204-9-2 & RXOTS-204-93) manually block.
BLSTA
TE
DESCRIPTION
BLL
Load in progress. The Managed
Object may be blocked or in
operation.
BLT
Blocked due to testing.
MBL
Manually blocked.
BLO
Automatically blocked.
BLA
Blocked due to activity needed.
Check E1 configuration
APUSAGE
<RXAPP:MO=RXOTG-204;
RADIO X-CEIVER ADMINISTRATION
ABIS PATH STATUS
MO
RXOTG-204
DEV
RBLT3-2904
…
RBLT3-2920
3
RBLT3-2921
6
7
RBLT3-2922
RBLT3-2923
RBLT3-2924
RBLT3-2925
RBLT3-2926
…
RBLT3-4896
11
RBLT3-4897
RBLT3-4898
RBLT3-4899
RBLT3-4900
…
RBLT3-4914
RBLT3-4915
RBLT3-4916
RBLT3-4917
END
DCP
287
APUSAGE
MPLEX16
MPLEX16
MPLEX16
MPLEX16
APSTATE
SPEECH/DATA
SPEECH/DATA
SPEECH/DATA
SPEECH/DATA
64K
NO
NO
NO
NO
TEI
303
CONC
TRXC SIGNAL
NO
0
1
2
304
CONC
CF/TRXC SIGNAL
NO
62
4
5
305
306
307
308
309
UNCONC
UNCONC
UNCONC
UNCONC
UNDEF
SPEECH/DATA
SPEECH/DATA
SPEECH/DATA
SPEECH/DATA
IDLE
YES
YES
YES
YES
YES
1
CONC
TRXC SIGNAL
NO
2
3
4
5
UNDEF
UNDEF
UNDEF
UNDEF
IDLE
IDLE
IDLE
IDLE
NO
NO
NO
NO
19
20
21
22
UNCONC
UNCONC
UNCONC
UNCONC
SPEECH/DATA
SPEECH/DATA
SPEECH/DATA
SPEECH/DATA
YES
YES
YES
YES
8
9
10
DESCRIPTION
MPLEX16
voice
CONC
TRX/CF Signaling
UNCONC
IF 64K = YES then EDGE
UNDEF
Not defined. Not in service
APUSAGE
CONFIGURATION
MPLEX16
4 VOICE TS = 1 RBLT3
CONC
4 TRX = 1 RBLT3
UNCONC
1 EDGE TS = 1 RBLT3. General 9
per site (3 sectors site)
Check DIP state

In case when there is no traffic at all of the cells connected to one site it might be transmission
problem. Check which DIP is connected to the devices with NTCOP:SNT=ALL;
SNT
ETM2-0

SNTV SNTP
1 XM-0-0-2
21RBL3
42RBL3
3RBL3
24RBL3
…
51RBL3
12RBL3
33RBL3
11RBL3
12RBL3
…
DIP DEV
SNTINL
0RBL3 RBLT3-0&&-31
0
RBLT3-672&&-703
1
RBLT3-1344&&-1375
2
RBLT3-96&&-127
3
RBLT3-768&&-799
4
…
…
RBLT3-1632&&-1663
11
RBLT3-384&&-415
12
RBLT3-1056&&-1087
13
RBLT3-2904&&-2935
14
RBLT3-4896&&-4927
15
…
…
Check state of the DIP with DTSTP:DIP=11RBL3&&12RBL3;
<dtstp:dip=11rbl2&12rbl2;
DIGITAL PATH STATE
DIP
TYPE STATE LOOP TSLOTL DIPEND FAULT
11RBL3 IEX ABL
LOF
12RBL3 IEX ABL
LOF
END

SECTION
LOF means Loss Of Frame, we have transmission problem in this case
Deblock blocked MO
<rxble:mo=RXOTS-204-9-2;
RXBLE:MO=RXOTS-204-9-2;
<;
RADIO X-CEIVER ADMINISTRATION
MANUAL DEBLOCKING OF MANAGED OBJECT COMMAND RESULT
MO
RXOTS-204-9-2
STATE
PREOP
RESULT
ORDERED
END
<
COMMAND SESSION SUSPENDED
RADIO X-CEIVER ADMINISTRATION
MANUAL DEBLOCKING OF MANAGED OBJECT RESULT
MO
RXOTS-204-9-2
STATE
OPER
RESULT
EXECUTED
END
<rxble:mo=RXOTS-204-9-3;
RXBLE:MO=RXOTS-204-9-3;
<;
RADIO X-CEIVER ADMINISTRATION
MANUAL DEBLOCKING OF MANAGED OBJECT COMMAND RESULT
MO
RXOTS-204-9-3
STATE
PREOP
RESULT
ORDERED
END
Use command RXBLE to deblock the manually blocked MO
Check the TG status again
<rxcdp:mo=rxotg-204;
RADIO X-CEIVER ADMINISTRATION
MANAGED OBJECT CONFIGURATION DATA
MO
RESULT
ARFCN MISMATCH
RXORX-204-0
CONFIG
HOP
NONE
...
RXORX-204-11
CONFIG
HOP
NONE
MO
RXOTS-204-0-0
...
RXOTS-204-9-2
RXOTS-204-9-3
...
RXOTS-204-11-7
RESULT
CONFIG
ARFCN
HOP
TXAD
9
TN
7
BPC
7176
CHCOMB
TCH
CONFIG
CONFIG
203
203
0
0
3
2
1175
1174
TCH
TCH
0
0
NO
NO
ON
ON
CONFIG
HOP
4
2
6031
TCH
0
NO
ON
MO
RXOTX-204-0
RXOTX-204-1
RXOTX-204-2
RXOTX-204-3
RXOTX-204-4
RXOTX-204-5
RXOTX-204-6
RXOTX-204-7
RXOTX-204-8
RXOTX-204-9
RXOTX-204-10
RXOTX-204-11
RESULT
CONFIG
CONFIG
CONFIG
CONFIG
CONFIG
CONFIG
CONFIG
CONFIG
CONFIG
CONFIG
CONFIG
CONFIG
ARFCN
206
HOP
HOP
HOP
200
HOP
HOP
HOP
HOP
HOP
203
HOP
TXAD
2
9
10
11
1
6
7
8
3
4
0
5
MO
RXODP-204-0
RESULT
CONFIG
SBITS
N1
320
MAIO EXCEEDS FREQUENCY SET SIZE
END
BSPWR
45
45
45
45
45
45
45
45
43
43
43
43
N3
OFFS
0
C0F MISMATCH
YES NONE
NO
NONE
NO
NONE
NO
NONE
YES NONE
NO
NONE
NO
NONE
NO
NONE
NO
NONE
NO
NONE
YES NONE
O
NONE
N4
XRA ICM
NO ON
Check cell resources again
<rlcrp:cell=GA4134C;
CELL RESOURCES
CELL
GA4134C
BCCH
1
CBCH
0
SDCCH
8
NOOFTCH
29- 58
...
CHGR
1
BPC
6031
CHANNEL
TCH-1801
TCH-11763
TCH-11762
CHRATE
FR
HR
HR
SPV
1,2,3
1,3
1,3
STATE
BUSY
LOCK
LOCK
ICMBAND
1
1
1
CHBAND
800
800
800
64K
NONE
959
TCH-2529
TCH-13219
TCH-13218
TCH-2530
TCH-13221
TCH-13220
FR
HR
HR
FR
HR
HR
1,2,3
1,3
1,3
1,2,3
1,3
1,3
BLOC
BLOC
BLOC
BUSY
LOCK
LOCK
1
1
1
800
800
800
EGPRS
TCH-275
TCH-8711
TCH-8710
FR
HR
HR
1,2,3
1,3
1,3
IDLE
IDLE
IDLE
1
1
1
800
800
800
NONE
...
960
EGPRS
...
7309
END

We have 29 TCH for FR, it should be 30, something is still wrong. (We have 4
frequencies for the cell, 8 timeslot for each, this means 32 timeslots, but 1 is occupied
by BCCH and an other one by SDCCH, so we have 30 TSs for TCH)
Bring on service the RBLT3
<RXAPP:MO=RXOTG-204;
RADIO X-CEIVER ADMINISTRATION
ABIS PATH STATUS
MO
RXOTG-204
DEV
…
RBLT3-2926
…
DCP
APUSAGE
APSTATE
64K
309
UNDEF
IDLE
YES
BRING ON SERVICE
<BLODI:dev=RBLT3-2926;
exdai:dev=RBLT3-2926;
EXDAI:DEV=RBLT3-2926;
<;
EXECUTED
<BLODE:dev=RBLT3-2926;
TEI
Check frequency hopping settings
<rlchp:cell=GA4134C;
CELL CONFIGURATION FREQUENCY HOPPING DATA
CELL
26112B
CHGR HSN HOP
MAIO
BCCD
0
35 OFF DEFAULT
YES
1
35 ON
2
YES
8
14
20
END

<rlcfp:cell=GA4134C;
CELL CONFIGURATION FREQUENCY DATA
CELL
26112B
CHGR SCTYPE SDCCH SDCCHAC TN CBCH
DCHNO
0
1
0
1 NO
35 OFF 93
2
1
1
0
0 NO
35 ON 104
1
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
END
We have 20 hopping frequencies, that's way the maximum for MAIO is 19
HSN HOP
Frequency Hopping types




In baseband hopping each
transmitter is assigned with a fixed
frequency.
At transmission all burst jumping from
one transmitter to the other
independently of the connection
The number of the frequencies can be
used for hopping = The number of
transmitters
Narrow-band combiners can handle
12 (16) transmitters.



In synthesizer hopping one transmitter
handles all frequencies belongs to the
same connection
The number of frequencies can be used
for hopping is independent from the
number of transmitters
Each TRX is configured to hop over a
large amount of frequencies (20 for
example)
Frequency hopping definitions

Random hopping sequence - > pseudo-random sequence

63 independent sequences, parameter HSN specifies which sequence will be used

Length of sequence ~ 6 minutes

Each transceiver in the same channel group in the same cell will be assigned with the same HSN (they
hop in the same way).

Avoid interference -> using an offset in the hopping sequence, called Mobil Allocation Index Offset
(MAIO).

CHGR: a group of frequencies handled in the same way within one cell. Channel group 0 contains the
Broadcast Control Channel (BCCH) and is automatically defined at cell definition.
________________________________
... , f 1 , f 4 , f 4 , f 3 , f 1 , f 2 , f 4 , f 1 , f 3 , f 3 , f 2 , ...
... , f 4 , f 3 , f 1 , f 2 , f 4 , f 1 , f 3 , f 3 , f 2 , f 2 , f 1 , ...
... , f 1 , f 2 , f 4 , f 1 , f 3 , f 3 , f 2 , f 2 , f 1 , f 4 , f 3 , ...
... , f 4 , f 1 , f 3 , f 3 , f 2 , f 2 , f 1 , f 4 , f 3 , f 1 , f 2 , ...
________________________________
Hopping sequences
BCCH: CHGR 0
TCH: CHGR 1 Frequency 104-123
MAIO: A=(0,2,4), B=(6,8,10), C=(12,14,16)
HSN: A=10, B=10, C=10
A valid GSM900 configuration with 20
hopping frequencies
Check MO fault information
rxmfp:mo=rxotg-2,subord,faulty;
RADIO X-CEIVER ADMINISTRATION
MANAGED OBJECT FAULT INFORMATION
MO
RXOTF-2
BTSSWVER
ERA-G04-R08-V01
RU RUREVISION
0
RUPOSITION
RUSERIALNO
RULOGICALID
STATE BLSTATE INTERCNT CONCNT CONERRCNT LASTFLT LFREASON
OPER
00000
EXTERNAL FAULT CODES CLASS 2B
1
END

RXOTF external fault code class 2B means not useable PCM reference (see attached
database)
RBS Software handling

Check loaded software with RXMOP:MOTY=RXOTG;
<rxmop:mo=rxotg-204;
RADIO X-CEIVER ADMINISTRATION
MANAGED OBJECT DATA
MO
RXOTG-21
Download software to DXU with
RXMSC:MO=RXOTG204,SWVER=xxxxx;

Initiate SW change with
RXPLI:MO=RXOTG-204;
RSITE
AHOP COMB FHOP MODEL
MACETOWN_ESB
OFF HYB SY G12
SWVERREPL
B4402R009V
….
END

SWVERDLD
…
SWVERACT
…
Summary

RBS: DXU, dTRU, CDU, CXU
Managed objects: TG → CF, CON, DP, TF → TRXC → TX, RX, → T

Managed object state: UNDEF, DEF, COM, PREOP (FAIL), OPER (NOOP)

Cell checking, and re-activation:









Check resources: RLCRP
Check connected TG: RXTCP
HALT Cell: RLSTC
Block MO: RXBLI (SUBORD, FORCE)
Take out service: RXESE (SUBORD)
Take in service: RXESI (SUBORD)
Deblock MO: RXBLE (SUBORD)
Activate Cell: RLSTC