Configuring GSM/WCDMA Interoperability

This section describes how to activate, verify, and deactivate the optional feature GBFD-114301

GSM/WCDMA Interoperability.

Prerequisites

Dependency on Hardware

o The MS supports both the GSM and WCDMA networks. It also supports

bidirectional cell reselection and handovers between GSM and WCDMA.

o The BSS and NSS support the GSM/WCDMA inter-RAT cell selection, cell

reselection, and location update. In addition, they support measurement control,

handover decision, and handover signaling procedure during inter-RAT

handovers.

Dependency on Other Features

o None

License

o The license is activated.

Initial Data Preparation

The basic data is configured. For details, see Configuring the Basic Data.

Context

The GSM/WCDMA Interoperability feature enables an MS to be handed over to or reselect a

GSM cell if the serving cell of the MS is not covered by the WCDMA network or in an area with

weak WCDMA coverage. When a dual-mode MS enters the coverage of the WCDMA network

again, or the MS detects that the signal quality in the WCDMA cell is higher than that in the

serving GSM cell, the MS can be handed over to or reselect a WCDMA cell if the handover or

cell reselection conditions are met. Then, the MS can enjoy the various services provided by the

WCDMA network.

The feature GSM/WCDMA Interoperability is applied to scenarios such as cell reselection and

handovers between GSM and WCDMA. This feature has no impact on services. The network

elements involved are the MS, BTS, BSC, MSC, PCU, SGSN, GGSN, and HLR.

Procedure

Activation Procedure

1. Run the BSC6900 MML command ADD GEXT3GCELL to add a 3G external

cell. In this step, set Utran Cell Type to FDD(FDD).

2. Run the BSC6900 MML command ADD G3GNCELL to add a neighboring 3G

cell.

3. Run the BSC6900 MML command SET BSCBASIC. In this step, set A

Interface Tag to GSM_PHASE_2Plus.

4. Run the BSC6900 MML command SET OTHSOFTPARA. In this step, set

Support Sent 2QUATER to YES(Yes), Send 3G Class Flag to YES(Yes), and

Classmark Enquiry With 3G Request to YES(Yes).

5. Run the BSC6900 MML command SET GCELLCCBASIC to set basic call

control parameters of a cell. In this step, set ECSC to YES(Yes).

Verification Procedure

1. Run the BSC6900 MML command LST GEXT3GCELL to query the value of

Utran cell type.

The expected result: The value of Utran cell type is TDD.

Deactivation Procedure

1. Run the BSC6900 MML command RMV G3GNCELL to remove the

neighboring 3G cell.

2. Run the BSC6900 MML command RMV GEXT3GCELL to remove the 3G

external cell.

Example

//Activating GSM/WCDMA Interoperability

ADD GEXT3GCELL: EXT3GCELLID=5048, EXT3GCELLNAME="5048", MCC="11", MNC="11",

LAC=11, CI=1, RNCID=11, RNCINDEX=255, DF=1, SCRAMBLE=1, DIVERSITY=NO,

UTRANCELLTYPE=FDD;

ADD G3GNCELL: IDTYPE=BYID, SRC3GNCELLID=0, NBR3GNCELLID=5048;

SET BSCBASIC: AVer=GSM_PHASE_2Plus;

SET OTHSOFTPARA: Send2QuterFlag=YES, SendUtranECSCFlag=YES,

CLASSMARKQUERY=YES;

SET GCELLCCBASIC: IDTYPE=BYID, CELLID=0, ECSC=YES;

//Deactivating GSM/WCDMA Interoperability

RMV G3GNCELL: EXT3GCELLID=5048, EXT3GCELLNAME="5048";

RMV GEXT3GCELL: IDTYPE=BYID, SRC3GNCELLID=0, NBR3GNCELLID=5048;

Parent topic: GBSS Feature Activation Guide

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