11.2 Procedures for CAMEL

23.0783GPPCustomised Applications for Mobile network Enhanced Logic (CAMEL) Phase 4Release 17Stage 2TS

11.2.1 Location Services

Handling of Any Time Interrogation to obtain Location Information involves the following process:

– CAMEL_ATI_GMLC.

If an OSS needs to retrieve the active location of a Mobile Station, the gsmSCF initiates a transaction to the GMLC by sending a Any Time Interrogation Request.

Figure 11.2-1: Process CAMEL_ATI_GMLC (sheet 1)

11.2.2 Any Time Interrogation

Handling of Any Time Interrogation to obtain Subscriber State and Location Information involves the following process:

– CAMEL_ATI_HLR.

If an OSS needs the Subscriber State and/or the Location Information, the gsmSCF initiates a transaction to the HLR by sending an Any_Time_Interrogation Request.

Figure 11.3-1: Process CAMEL_ATI_HLR (sheet 1)

11.2.3 Provide Subscriber Information in the SGSN

The provision of Subscriber State and Location Information involves the following process and procedures:

– CAMEL_Provide_Subscriber_Info_SGSN;

– CAMEL_Active_Info_Retrieval_SGSN;

– Retrieve_GPRS_MS_Class_If_Required;

– Retrieve_IMEI_If_Required.

11.2.3.1 Procedure CAMEL_Provide_Subscriber_Info_SGSN

If the SGSN receives a Provide Subscriber Info request, it performs procedures to obtain the requested information.

The test "Active retrieval required" takes the "Yes" exit if any one or more of current location, GPRS MS class or IMEI is indicated in the Provide Subscriber Info request.

11.2.3.2 Procedure CAMEL_Active_Info_Retrieval_SGSN

If the SGSN data show that the MS is in the "Iu Connected" state (i.e. it has an Iu connection established), the SGSN performs the Location Reporting Control procedure (Direct report) which is defined in 3GPP TS 25.413 [33].

The test "Report on change of service area" takes the "Yes" exit if the SGSN has performed the Location Reporting Control procedure with the Request Type IE set to "Change of service area".

If the SGSN data show that the MS is in the "A/Gb Ready" state (i.e. it is transferring packet data over an A/Gb access connection) then the currently stored location information is up to date, and no further action is required.

Figure 11.4-1: Process CAMEL_Provide_Subscriber_Info_SGSN (sheet 1)

Figure 11.5-1: Procedure CAMEL_Active_Info_Retrieval_SGSN (sheet 1)

Figure 11.5-2: Procedure CAMEL_Active_Info_Retrieval_SGSN (sheet 2)

Figure 11.6-1: Procedure Retrieve_GPRS_MS_Class_If_Required (sheet 1)

Figure 11.7-1: Procedure Retrieve_IMEI_If_Required (sheet 1)