21.1 General

29.0023GPPMobile Application Part (MAP) specificationRelease 17TS

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 handle the reporting of MS status for call completion services;

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

– to handle the alerting and termination of ongoing call activities for a specific subscriber;

– to handle early release of no longer needed resources;

– to relay a mobile terminating call from the old to the new MSC during the Mobile Terminating Roaming Forwarding procedure.

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 3GPP TS 23.018 [97].

The stage 2 specification for the retrieval of routeing information to handle a mobile terminating call is in 3GPP TS 23.018 [97]; modifications to this procedure for CAMEL are specified in 3GPP TS 23.078 [98], for optimal routeing of a basic mobile-to-mobile call in 3GPP TS 23.079 [99] and for CCBS in 3GPP TS 23.093 [107]. 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 3GPP TS 23.079 [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 3GPP TS 43.068 [100] and 3GPP TS 43.069 [101]. 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 interworking between the call handling procedures and signalling protocols other than MAP are shown in 3GPP TS 23.018, 3GPP TS 23.078 and 3GPP TS 23.079 [99].

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 3GPP TS 23.093 [107].

The stage 2 specification for the Mobile Terminating Roaming Forwarding procedure is in 3GPP TS 23.018 [97] and 3GPP TS 23.012 [23].