11.1 Architecture

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

11.1.1 Functional Entities used for CAMEL

This subclause describes procedures for the retrieval of subscriber location and subscriber state information. Location Services is only supported in CAMEL Phase 3 and higher.

1) The gsmSCF may request location information of a mobile station from the GMLC via Location Services. The information flow of Location Services is described in 3GPP TS 23.271 [28] and 25. 305 [32]. Figure 11.1-1 indicates the functional entities involved in the procedures for the retrieval of location information via location services.

2) The gsmSCF may request any of location information, subscriber state information, IMEI and MS Class of a mobile station from the HLR. Any of location information, subscriber state information, IMEI and MS Class may be requested either from the circuit switched or the packet switched domain.

If any of location information, subscriber state information, IMEI and MS Class is requested by the gsmSCF, then the HLR may retrieve this information via the Provide Subscriber Information procedure from either the MSC/VLR or the SGSN. This procedure is defined in subclause 4.5.9 of the present document.

The interface for the provision of subscriber location and state information between HLR and MSC/VLR is described in 3GPP TS 23.018 [12]. The interface for the provision of subscriber location and state information between HLR and SGSN is described in this chapter. Figure 11.1-2 indicates the functional entities involved in the procedures for the retrieval of location information and/or subscriber state information from the circuit switched or packet switched domain.

Figure 11.1-1: Functional architecture for CAMEL Support of Location Services

Figure 11.1-2: Functional architecture for Any Time Interrogation

gsmSCF: see subclause 3.1.

GMLC: A functional entity that allows external LCS Clients to request real-time information about a Mobile Station. The information that can be requested from the GMLC is the location of the mobile station.

HLR: see subclause 4.1.

MSC/VLR: see subclause 4.1.

SGSN: see subclause 6.1.1. The SGSN stores location and state information for each subscriber. Upon request this information is provided to the HLR.

The information flows between the GMLC and functional entities other than the gsmSCF, have not been indicated in the functional architecture shown in figures 11.1. These information flows are outside the scope of the present document.

11.1.2 Interfaces defined for CAMEL

This subclause describes the interfaces applicable to CAMEL. It specifies on a high level the functions specific to CAMEL.

11.1.2.1 gsmSCF – GMLC interface

This interface is used by the gsmSCF to request information (Mobile Station location) from the GMLC at any time.

11.1.2.2 GMLC – gsmSCF interface

This interface is used by the GMLC to return the requested information (Mobile Station location) to the gsmSCF as requested by the gsmSCF via the Any Time Interrogation procedure.

11.1.2.3 gsmSCF – HLR

This interface is used by the gsmSCF to interrogate the HLR. As a network operator option, the HLR may refuse to provide the information requested by the gsmSCF.

11.1.2.4 HLR – gsmSCF

This interface is used by the HLR to return the requested information to the gsmSCF as requested by the gsmSCF via the Any Time Interrogation procedure.

11.1.2.5 HLR – SGSN

This interface is used by the HLR to request information from the SGSN.

11.1.2.5 SGSN – HLR

This interface is used by the SGSN to return the requested information to the HLR.