25.4.1 Macro Process_Access_Request_MSC

29.0023GPPMobile Application Part (MAP) specificationRelease 17TS

Sheet 1: The MAP_PROCESS_ACCESS_REQUEST request includes the following parameters:

– the received subscriber identification (IMSI, TMSI);

– the CM service type, indicating the type of request;

– the status of the access connection, i.e. whether a connection to this MS already exists and if so, whether it is already authenticated and ciphered;

– the current location area id of the MS; and

– the CKSN received from the MS.

Sheet 2, sheet 3: If the MSC receives an A_SETUP indication while it is waiting for further instructions from the VLR or for the acknowledgment of TMSI reallocation from the MS, the MSC saves the setup request for processing after control has returned from the macro Process_Access_Request_MSC to the calling process.

Sheet 3: When the MSC is waiting for a possible instruction to allocate a new TMSI, a MAP_DELIMITER indication indicates that TMSI reallocation is not required.

Sheet 3: If the MS sends a TMSI reallocation failure in response to the TMSI reallocation command, the MSC takes the OK exit; the VLR treats the lack of response as a provider error (see macro Process_Access_Request_VLR).