Service Based HO Description 1/3 Forces UE on DCHs using a “speech only” service, to move from WCDMA RAN coverage to GSM network coverage Allows the operator to redirect speech users to GSM using a Service Indicator (SI) that can be set per subscriber Activated at RNC level
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Service Based HO Description 1/3
Forces UE on DCHs using a “speech only” service, to move from WCDMA RAN coverage to GSM network coverage
Allows the operator to redirect speech users to GSM using a Service Indicator (SI) that can be set per subscriber
Activated at RNC level
Service Based HO Description 2/3
Handover decision of a “speech only” call is made by RANAP IE Service Handover from MSC during call setup
IE has three values
- Should: Via SBHO
- Should Not: Only when coverage is lost
- Shall Not: Never handover to GSM
Service Based HO Description 3/3
Provides means to the operator to modify IRAT HO characteristics per call basis
Must be activated in core network (MSC) and in the radio network (UTRAN and BSS)
SBHO feature is activated per BSC with exchange property SBHOACTIVE
Affected Nodes 1/1 2G MSC 3G MSC BSC RNC Additionally, one GSM cell with neighbour
relations to WCDMA cell must exist. The GSM cell and the WCDMA cell shall cover the same area.
MSC Parameters 1/1 CSERVHOVER SERVHOVER BSHSPGSMRES BSHSPWCDMARES BSHSPNORES RSHSPGSMRES RSHSPWCDMARES RSHSPNORES
RNC Parameters 1/1 serviceBasedHoSupport tmStopGsmMeas gsmHoAllowed fddGsmHoSupp hoType
BSC Parameters 1/1 BSHSPGSMRES BSHSPWCDMARES BSHSPNORES
MSC Preperation 1/2 Action1: Verify that the feature “Partial
Roaming” is de-activated in the MSC. The value should be 0
Action2: Verify that the feature “Service based handover” is available in the MSC. The value should be 1
Action3: Verify that the feature “Service based handover” is activated in the MSC. The value should be 1
MSC Preperation 2/2 Action4: Verify BSHSPGSMRES is set to 2
in the 2G MSC
Action5: Print analysis results for the IMSI NUMBER SERIES in both MCSs
Action6: Define in the IMSI NUMBER SERIES a FORBRAT profile for the IMSI of a subscriber
WCDMA RAN Preperation 1/1
Action7: Set the following parameters to “ON” in the RNC
- ServiceBasedHOSupport- GsmHoAllowed- FddGsmHoSupport
Action8: Set HoType to GSM_Preferred at cell level
BSC Preperation 1/1 Action9: Verify that the feature “Service
based handover” is available in the BSC. The value should be 1
Action10: In the BSC, activate the optional feature SBHO for the BSC
SBHO Sequence 1/1
Tools Needed For Demo 1/1
Two UE dual band (GSM/WCDMA)
TEMS software
Demo Case.1 SBHO 3G to 2G 1/2
Demonstrate that service based handover to GSM is performed for a speech call, when the IMSI series analysis ANRES parameter FORBRAT is set to 1 for the originating UE
UE1 is forced to perform inter-system handover to GSM
The parameter RSHSPGSMRES call should be set to 0 (default value)
Demo Case.1 SBHO 3G to 2G 2/2
Check that parameter FORBRAT is set to 1 (GSM access forbidden) for UE
Demo Case.1 Execution 1/2
Perform a Location Update with UE in WCDMA. (3G MSC)
Initiate an originating call from UE1 to UE2- The call will be handed over to GSM (2G
MSC)- The “handover request” message will be
sent to 2G MSC with “BSSMAP service handover IE” = 2, encapsulated into “MAP prepare handover request”. The “MAP prepare handover request” will also include “RANAP service handover IE” with value =0.
Demo Case.1 Execution 2/2
Monitor SBHO Counters
RNC Level Counters- pmTotNoSbHo- pmnoSbHoMeasStart- pmNoSuccessSbHo
Cell Level Counters- pmNoAttSbHoSpeech - pmNoSuccessOutSbHoSpeech
Demo Case.2 SBHO 3G to 2G Trigerred by Coverage
1/2 Demonstrate that service based handover
to GSM is performed for a speech call only if the 3G coverage decreased, when the IMSI series analysis ANRES parameter FORBRAT is set to 1 for the originating UE
UE1 is will not perform inter-system handover to GSM unless the 3G coverage decreased
Demo Case.2 SBHO 3G to 2G Trigerred by Coverage
2/2 The parameter RSHSPGSMRES call should
be set to 1
Check that parameter FORBRAT is set to 1 (GSM access forbidden) for UE
Demo Case.2 Execution 1/2
Perform a Location Update with UE in WCDMA (3G MSC)
Initiate an originating call from UE1 to UE2
Demo Case.2 Execution 2/2
Monitor SBHO Counters
RNC Level Counters- pmTotNoSbHo- pmnoSbHoMeasStart- pmNoSuccessSbHo
Cell Level Counters- pmNoAttSbHoSpeech - pmNoSuccessOutSbHoSpeech
Demo Case.3 Speech Call Will be Kept in 3G (No IRAT
HO) 1/2
Demonstrate that service based handover to GSM will not be performed for a speech call. When the 3G coverage decreased, the call will be dropped, the IMSI series analysis ANRES parameter FORBRAT is set to 1 for the originating UE
UE1 is will not perform inter-system handover to GSM until the 3G coverage decreased and then dropped
Demo Case.3 Speech Call Will be Kept in 3G (No IRAT
HO) 2/2
The parameter RSHSPGSMRES call should be set to 2
Check that parameter FORBRAT is set to 1 (GSM access forbidden) for UE
Demo Case.3 Execution 1/1
Perform a Location Update with UE in WCDMA (3G MSC)
Initiate an originating call from UE1 to UE2
The call will be kept in 3G MSC, when the 3G coverage decrease, the call will dropped
Constants 1/3 Constants are hard-coded values so can
not be changed by the operator
C_gsmHoAllowed Indicates per UeRc state if Inter-RAT HO is allowed Value: 0= Not allowed, 1= Allowed
C_ifHoAllowed Indicates per UeRc state if Inter-Frequency HO is allowed Value: 0= Not allowed, 1= Allowed
Constants 2/3 C_MaxBufferTime
Description: Maximum time in buffer for a buffered report Value: 2 seconds
C_MaxSohoListSubset Description: Maximum number of intra-frequency WCDMA RAN cells that the UE will measure on Value: 32
Constants 3/3 C_utranThresh3aForcedGsm
Description: UTRAN threshold for event 3a for Service Based GSM Handover measurements using measurement quantity CPICH Ec/No Value: 0
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