21.1 General

09.023GPPMobile Application Part (MAP) specificationTS

The MAP call handling procedures are used:

– to retrieve routeing information to handle a mobile terminating call;

– to transfer control of a call back to the GMSC if the call is to be forwarded;

– to retrieve and transfer information between anchor MSC and relay MSC for inter MSC group calls / broadcast calls;

– to allocate resources in an SIWFS;

– to handle the reporting of MS status for call completion services;

– to handle the notification of remote user free for CCBS.

The procedures to handle a mobile originating call and a mobile terminating call after the call has arrived at the destination MSC do not require any signalling over a MAP interface. These procedures are specified in GSM 03.18 [97].

The stage 2 specification for the retrieval of routeing information to handle a mobile terminating call is in GSM 03.18 [97]; modifications to this procedure for CAMEL are specified in GSM 03.78 [98], for optimal routeing of a basic mobile-to-mobile call in GSM 03.79 [99] and for CCBS in GSM 03.93. The interworking between the MAP signalling procedures and the call handling procedures for each entity (GMSC, HLR and VLR) is shown by the transfer of signals between these procedures.

The stage 2 specification for the transfer of control of a call back to the GMSC if the call is to be forwarded is in GSM 03.79 [99]. The interworking between the MAP signalling procedures and the call handling procedures for each entity (VMSC and GMSC) is shown by the transfer of signals between these procedures.

The stage 2 specifications for inter MSC group calls / broadcast calls are in GSM 03.68 and GSM 03.69. The interworking between the MAP signalling procedures and the group call /broadcast call procedures for each entity (Anchor MSC and Relay MSC) is shown by the transfer of signals between these procedures.

The stage 2 specification for the allocation of resources in an SIWFS is in GSM 03.54. The interworking between the MAP signalling procedures and the call handling procedures for each entity (VMSC and SIWFS) is shown by the transfer of signals between these procedures.

The interworking between the call handling procedures and signalling protocols other than MAP is shown in GSM 03.18,GSM 03.78 and GSM 03.79.

The stage 2 specification for the handling of reporting of MS status for call completion services and notification of remote user free for CCBS is in GSM 03.93.