7.2.3 Functional requirements of VLR

03.183GPPBasic call handlingRelease 1998TS

7.2.3.1 Process PRN_VLR

Sheet 1: the procedure Check_Parameters is specified in subclause 7.2.2.2.

Sheet 1, sheet 3: the procedure CAMEL_SET_SOA is specific to CAMEL; it is specified in GSM 03.78 for CAMEL Phase 1 [8] and GSM 03.78 for CAMEL Phase 2 [9].

Sheet 2, sheet 3: the task "Store alerting pattern (if received)" is executed only if the VLR supports the feature Network Indication of Alerting.

Sheet 2, sheet 3: the procedure CLI_PRN_VLR is specific to Enhanced CLI Handling. It is specified in GSM 03.81 [11].

Sheet 2, sheet 3: the procedure CCBS_Handle_PRN is specific to CCBS; it is specified in GSM 03.93 [19].

Sheet 2: the number of unused authentication sets which triggers the VLR to request further authentication sets from the HLR is an operator option.

Sheet 2: the process Fetch_Authentication_Sets_VLR is specified in subclause 7.1.2.11.

7.2.3.2 Process Restore_Subscriber_Data_VLR

7.2.3.3 Process PSI_VLR

Sheet 1: the procedure Check_Parameters is specified in subclause 7.2.2.2. If the HLR requests neither location information nor subscriber state, the VLR treats this as a missing parameter.

7.2.3.4 Procedure Retrieve_Location_Info_VLR

The test "Retrieve location info from SGSN" takes the "Yes" exit if:

– the Gs interface is implemented; and

– there is an association established between the MSC/VLR and the SGSN.

The stored location information consists of:

– the cell ID of the cell in which the MS last established radio contact;

– the location number and geographical information derived from the cell ID if the VLR is capable of doing so (the mapping from cell ID to location number is network-specific and outside the scope of the GSM standard);

– the age of the location information.

The output signal Send MS information towards the SGSN indicates that the required information is mobile location information.

The derivation of the location number and geographical information from the received cell ID is a VLR operator option (the mapping from cell ID to location number is network-specific and outside the scope of the GSM standard).

Figure 54a: Process PRN_VLR (sheet 1)

Figure 54b: Process PRN_VLR (sheet 2)

Figure 54c: Process PRN_VLR (sheet 3)

Figure 55: Process Restore_Subscriber_Data_VLR

Figure 56a: Process PSI_VLR (sheet 1)

Figure 56b: Process PSI_VLR (sheet 2)

Figure 57: Procedure Retrieve_Location_Info_VLR