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Content for  TS 23.078  Word version:  19.0.0

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11 Subscriber Location and State retrieval  11.1 Architecture  11.2 Procedures for CAMEL  11.3 Description of information flows  11.3.1 gsmSCF to GMLC information flows  11.3.2 GMLC to gsmSCF information flows  11.3.3 gsmSCF to HLR information flows  11.3.4 HLR to gsmSCF information flows  11.3.5 HLR to SGSN information flows  11.3.6 SGSN to HLR information flows 
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11  Subscriber Location and State retrieval  p. 722

Support of the procedures described in this clause in CAMEL Phase 4 is a network operator option.

11.1  Architecture  p. 722

11.1.1  Functional Entities used for CAMEL  p. 722

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 TS 23.271 and TS 25.305. 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 TS 23.018. 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.
Copy of original 3GPP image for 3GPP TS 23.078, Fig. 11.1-1: Functional architecture for CAMEL Support of Location Services
Figure 11.1-1: Functional architecture for CAMEL Support of Location Services
(⇒ copy of original 3GPP image)
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Copy of original 3GPP image for 3GPP TS 23.078, Fig. 11.1-2: Functional architecture for Any Time Interrogation
Figure 11.1-2: Functional architecture for Any Time Interrogation
(⇒ copy of original 3GPP image)
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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  p. 723

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  p. 723

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  p. 723

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  p. 723

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  p. 724

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 |R5|  p. 724

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

11.1.2.6  SGSN - HLR |R5|  p. 724

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

11.2  Procedures for CAMEL  p. 724

11.2.1  Location Services  p. 724

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.
Copy of original 3GPP image for 3GPP TS 23.078, Fig. 11.2-1: Process CAMEL_ATI_GMLC (sheet 1)
Figure 11.2-1: Process CAMEL_ATI_GMLC (sheet 1)
(⇒ copy of original 3GPP image)
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11.2.2  Any Time Interrogation  p. 726

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.
Copy of original 3GPP image for 3GPP TS 23.078, Fig. 11.3-1: Process CAMEL_ATI_HLR (sheet 1)
Figure 11.3-1: Process CAMEL_ATI_HLR (sheet 1)
(⇒ copy of original 3GPP image)
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11.2.3  Provide Subscriber Information in the SGSN |R5|  p. 728

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  p. 728

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  p. 728

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 TS 25.413.
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.
Copy of original 3GPP image for 3GPP TS 23.078, Fig. 11.4-1: Process CAMEL_Provide_Subscriber_Info_SGSN (sheet 1)
Figure 11.4-1: Process CAMEL_Provide_Subscriber_Info_SGSN (sheet 1)
(⇒ copy of original 3GPP image)
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Copy of original 3GPP image for 3GPP TS 23.078, Fig. 11.5-1: Procedure CAMEL_Active_Info_Retrieval_SGSN (sheet 1)
Figure 11.5-1: Procedure CAMEL_Active_Info_Retrieval_SGSN (sheet 1)
(⇒ copy of original 3GPP image)
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Copy of original 3GPP image for 3GPP TS 23.078, Fig. 11.5-2: Procedure CAMEL_Active_Info_Retrieval_SGSN (sheet 2)
Figure 11.5-2: Procedure CAMEL_Active_Info_Retrieval_SGSN (sheet 2)
(⇒ copy of original 3GPP image)
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Copy of original 3GPP image for 3GPP TS 23.078, Fig. 11.6-1: Procedure Retrieve_GPRS_MS_Class_If_Required (sheet 1)
Figure 11.6-1: Procedure Retrieve_GPRS_MS_Class_If_Required (sheet 1)
(⇒ copy of original 3GPP image)
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Copy of original 3GPP image for 3GPP TS 23.078, Fig. 11.7-1: Procedure Retrieve_IMEI_If_Required (sheet 1)
Figure 11.7-1: Procedure Retrieve_IMEI_If_Required (sheet 1)
(⇒ copy of original 3GPP image)
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11.3  Description of information flows  p. 734

This subclause contains the detailed description of the information flows used by CAMEL for the retrieval of information about the location and state of a subscriber.
Each Information Element (IE) is marked as Mandatory (M), Conditional (C), Specific conditions (S), mutually Exclusive (E) or not applicable (-) in the "Status" column.
An 'M' IE shall always be included. A 'C' IE shall be included if the sending entity has the necessary information to populate the IE. The conditions for the inclusion of an 'S' IE are shown in the 'Description' column of the definition table. When a set of 'E' IEs is shown in the definition of an Information Flow or compound IE, only one of those IEs may be included. A '-' IE shall always be omitted. This categorization is a functional classification, i.e. it defines the requirements for the stage 2 information. It is not a stage 3 classification to be used for the ASN.1 syntax of the protocol.
The following principles apply for the handling of the IEs by the receiving entity:
  • The gsmSCF may silently discard any IE which it does not functionally support.
  • The GMLC shall return an error if it does not functionally support an IE which it receives.
Details of errors and exceptions to these rules are specified in TS 29.002.
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11.3.1  gsmSCF to GMLC information flows  p. 734

11.3.1.1  Any Time Interrogation Request  p. 734

11.3.1.1.1  Description  p. 734
This IF is used to request information (Mobile Station location) from the GMLC.
11.3.1.1.2  Information Elements  p. 734
Information element name Status Description
gsmSCF AddressMThis IE indicates the address of the interrogating gsmSCF. The gsmSCF Address shall be in international E.164 format.
Requested InfoMThis IE indicates the type of information that is requested. It shall have the following value:
  • Mobile Station location
Mobile Station IdentityMThis IE identifies the Mobile Station of which the information is requested. The identity shall be either:
  • IMSI, or
  • MSISDN
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11.3.2  GMLC to gsmSCF information flows  p. 734

11.3.2.1  Any Time Interrogation ack  p. 734

11.3.2.1.1  Description  p. 734
This IF is used by the GMLC to provide the requested information to the gsmSCF.
11.3.2.1.2  Information Elements  p. 734
Information element name Status Description
Location InformationCThis IE indicates the location of the Mobile Station.
Location Information is defined in TS 23.018. The following differences apply:
Information element name Status Description
Location number-Not applicable
Service area ID-Not applicable
Cell ID-Not applicable
Geographical informationCSee TS 23.032. The GMLC receives Extended Geographical Information from the MSC. The Extended Geographical Information shall be converted to the Geographical Information by the GMLC.
VLR number-Not applicable
Current Location Retrieved-Not applicable
MSC numberCThe GMLC receives the MSC number from the HLR in the SendRoutingInfoForLCS MAP message.
SGSN numberCThe GMLC receives the SGSN number from the HLR in the SendRoutingInfoForLCS MAP message.
User CSG InformationCSee TS 23.060.
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11.3.3  gsmSCF to HLR information flows  p. 735

11.3.3.1  Any Time Interrogation Request  p. 735

11.3.3.1.1  Description  p. 735
This IF is used to request information (any one or more of subscriber state, subscriber location, IMEI (with software version) and MS classmark information for the requested domain) from the HLR at any time.
11.3.3.1.2  Information Elements  p. 735
Information element name Status Description
Subscriber IdentityMThis IE identifies the subscriber for which the information is requested. The identity shall be either:
  • IMSI, or
  • MSISDN.
Requested InfoMThis IE indicates the type of subscriber information being requested. This IE is described in a Table below.
gsmSCF AddressMThis IE indicates the address of the interrogating gsmSCF. The gsmSCF Address shall be in international E.164 format.
Requested Info contains the following information elements:
Information element name Status Description
Location InformationOThis IE indicates that the Location Information is requested.
Subscriber StateOThis IE indicates that the Subscriber State is requested.
Current LocationO,SThis IE indicates that the Current Location is requested. This IE shall not be present if Location Information is not present in Requested Info.
Location Information in EPS SupportedO,SThis IE indicates by its presence that Location Information in EPS is supported. This IE should be present if Location Information is present in Requested Info and Location Information in EPS is supported. This IE shall not be present if Location Information is not present in Requested Info.
Requested DomainMThis IE indicates for which domain the subscriber info is requested. It shall be one of the following:
  • circuit switched domain;
  • packet switched domain.
IMEI (with software version)OThis IE indicates that the IMEI (with software version) is requested.
MS class mark information for the requested domainOThis IE indicates that the MS classmark information for the indicated domain is requested.
Requested Info shall contain one or more of the following information elements:
  • Location Information;
  • Subscriber State;
  • IMEI (with software version);
  • MS classmark information for the requested domain.
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11.3.4  HLR to gsmSCF information flows  p. 736

11.3.4.1  Any Time Interrogation ack  p. 736

11.3.4.1.1  Description  p. 736
This IF is used by the HLR to provide the requested subscriber location and/or subscriber state information to the gsmSCF.
11.3.4.1.2  Information Elements  p. 736
Information element name Status Description
Location InformationC, E1This IE indicates the location of the served subscriber in the MSC/VLR. It shall be present only if requested by the gsmSCF.
Location Information For GPRSC, E1This IE indicates the location of the served subscriber in the SGSN. It shall be present only if requested by the gsmSCF.
Subscriber StateS, E2This IE indicates the state of the MS in the CS domain. It shall be present only if requested by the gsmSCF. The possible values of the IE are:
  • CAMELBusy: The VLR has indicated that the MS is engaged in a transaction for a mobile originating or terminated circuit-switched call.
  • NetworkDeterminedNotReachable: The HLR or VLR has indicated that the network can determine from its internal data that the MS is not reachable.
  • AssumedIdle: The VLR has indicated that the state of the MS is neither "CAMELBusy" nor "NetworkDeterminedNotReachable".
  • NotProvidedFromVLR: The VLR did not provide any information on subscriber state even though it was requested.
PS Domain Subscriber StateS, E2This IE indicates the state of the MS in the PS Domain. It shall be present only if requested by the gsmSCF. The possible values of the IE are:
  • Detached (see subclause 11.3.5.1).
  • CAMEL attached, MS not reachable for paging (see subclause 11.3.5.1).
  • CAMEL attached, MS may be reachable for paging (see subclause 11.3.5.1).
  • CAMEL PDP active, MS not reachable for paging (see subclause 11.3.5.1).
  • CAMEL PDP active, MS may be reachable for paging (see subclause 11.3.5.1).
  • Not provided from SGSN: The SGSN does not support Provide Subscriber Info or it did not provide any information on subscriber state even though it was requested.
  • NetworkDeterminedNotReachable: The HLR has indicated that the network can determine from its internal data that the MS is not reachable.
PDP Context Information ListC This IE indicates the PDP context information (see the Table in subclause 11.3.5.1) for each PDP context which is active for the MS. It shall be present if the PS domain Subscriber State has the value "CAMEL PDP active, MS not reachable for paging" or "CAMEL PDP active, MS may be reachable for paging"; otherwise it shall be absent.
IMEI (with software version)CThis IE contains the IMEISV (as defined in TS 23.003) of the ME in use by the served subscriber. It shall be present only if requested by the gsmSCF.
MS Classmark 2CThis IE contains the MS classmark 2, which is returned by the MS when it responds to paging in the CS domain. It shall be present only if requested by the gsmSCF.
GPRS MS ClassCThis IE contains the MS network and radio access capabilities. It shall be present only if requested by the gsmSCF.
Location Information is defined in TS 23.018. The following differences apply:
Information element name Status Description
Service area IDC,ESee TS 23.018.
Cell IDC,ESee TS 23.018.
VLR NumberCSee TS 23.018. The HLR shall include the internally stored VLR Number.
Location area IDC,ESee TS 23.003.
Selected LSA IdentityCThis IE indicates the LSA identity associated with the current position of the MS. It shall be present if the LSA ID in the subscriber data matches the LSA ID of the current cell. In the case of multiple matches the LSA Id with the highest priority it shall be present. See TS 43.073.
MSC numberCE.164 number which identifies the VMSC in whose area the subscriber is currently registered. See TS 23.003. If the HLR receives the MSC number from the VLR in the Provide Subscriber Info ack IF then the HLR shall ignore the MSC number.
User CSG InformationCSee TS 23.060.
E-UTRAN Cell IDC, ESee TS 23.018.
Tracking area IDC, ESee TS 23.018.
Location Information for GPRS is defined in the subclause 11.3.6.1.2. The following differences apply:
Information element name Status Description
SGSN NumberCSee subclause 11.3.6.1.2. The HLR shall include the internally stored SGSN Number.
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11.3.5  HLR to SGSN information flows |R5|  p. 737

11.3.5.1  Provide Subscriber Info  p. 737

11.3.5.1.1  Description  p. 737
This IF is used by the HLR to request information (subscriber state and/or location) from the SGSN at any time.
11.3.5.1.2  Information Elements  p. 737
This IF is defined in TS 23.018. The following differences apply:
Information element name Status Description
LMSI-Not applicable.
Requested InfoMThis IE indicates which of the following information the HLR requires:
  • Subscriber location;
  • Subscriber state;
  • Current location;
  • IMEI & Software version;
  • GPRS MS classmark information.
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11.3.6  SGSN to HLR information flows |R5|  p. 737

11.3.6.1  Provide Subscriber Info ack  p. 737

11.3.6.1.1  Description  p. 737
This IF is used by the SGSN to provide the requested subscriber location and/or subscriber state information to the HLR.
11.3.6.1.2  Information Elements  p. 738
This IF is defined in TS 23.018. The following differences apply:
Information element name Status Description
Subscriber State-Not applicable.
PS domain Subscriber StateCThis IE indicates the status of the MS in the PS Domain. It shall be present only if requested by the HLR. The possible values of the IE are:
  • Detached: The SGSN has determined from its internal data that the MS is not attached to the network.
  • CAMEL attached, MS not reachable for paging: The SGSN has determined from its internal data that the MS is attached to the network, but there is no PDP Context active, and the MS is not reachable for paging.
  • CAMEL attached, MS may be reachable for paging: The SGSN has determined from its internal data that the MS is attached to the network, but there is no PDP Context active; the SGSN has not determined from its internal data that the MS is not reachable for paging.
  • CAMEL PDP active, MS not reachable for paging: The SGSN has determined from its internal data that the MS is attached to the network there is at least on PDP context active, and the MS not reachable for paging.
  • CAMEL PDP active, MS may be reachable for paging: The SGSN has determined from its internal data that the MS is attached to the network and there is at least one PDP context active; the SGSN has not determined from its internal data that the MS is not reachable for paging.
PDP Context Information ListSThis IE is described in a Table below.
This IE indicates the PDP context information for each PDP context which is active for the MS.
It shall be present if the PS domain Subscriber State has the value "CAMEL PDP active, MS not reachable for paging" or "CAMEL PDP active MS may be reachable for paging"; otherwise it shall be absent.
Location Information For GPRSCThis IE is described in a Table below.
It indicates the location of the MS.
It shall be present only if requested by the HLR.
IMEI (with software version)CThis IE contains the IMEI & software version of the ME in use by the served subscriber. It shall be present only if requested by the HLR.
GPRS MS ClassCThis IE contains the MS network and radio access capabilities. It shall be present only if requested by the HLR.
PDP Context Information includes the following information elements:
Information element name Status Description
PDP Context IdentifierMIndex of the PDP context.
PDP StateCPacket data protocol state, INACTIVE or ACTIVE.
PDP TypeCPDP type, e.g., PPP or IP.
PDP AddressCPDP address, e.g., an IP address.
APN SubscribedCThe APN received from the HLR.
APN in UseCThe APN currently used.
NSAPICNetwork layer Service Access Point Identifier.
TICTransaction Identifier.
TEID for Gn/GpCTunnel Endpoint Identifier for the Gn and Gp interfaces.
TEID for IuCTunnel Endpoint Identifier for the Iu interface.
GGSN Address in UseCThe IP address of the GGSN currently used.
The SGSN shall report the GGSN address in the same IP version as in the S-CDR. See TS 32.251.
Subscribed QoSCThe quality of service profile subscribed.
Requested QoSCThe quality of service profile requested.
Negotiated QoSCThe quality of service profile negotiated.
Charging IDCCharging identifier, identifies charging records generated by SGSN and GGSN.
PDP Context Charging CharacteristicsCThe charging characteristics of this PDP context, e.g., normal, prepaid, flat-rate, and/or hot billing.
RNC Address In UseCThe IP address of the RNC currently used.
Requested QoS ExtensionSThis IE contains a supplement to the Requested QoS IE. It shall be present if the Requested QoS IE is present and the MS requested one or more of the following for the PDP context:
  • Source Statistics Descriptor;
  • Signalling Indication;
  • Maximum bit rate for downlink (extended);
  • Guaranteed bit rate for downlink (extended).
Otherwise, it shall be absent.
Subscribed QoS ExtensionSThis IE contains a supplement to the Subscribed QoS IE. It shall be present if the Subsribed QoS IE is present and one or more of the following is part of the subscription profile in the HLR:
  • Maximum bit rate for downlink (extended);
  • Guaranteed bit rate for downlink (extended).
Otherwise, it shall be absent.
Negotiated QoS ExtensionSThis IE contains a supplement to the Negotiated QoS. It shall be present if the Negotiated QoS IE is present and one or more of the following was negotiated between the MS, the SGSN and the GGSN:
  • Source Statistics Descriptor;
  • Signalling Indication;
  • Maximum bit rate for downlink (extended);
  • Guaranteed bit rate for downlink (extended).
Otherwise, it shall be absent.
Location Information For GPRS includes the following information elements:
Information element name Status Description
Service area IDC,ESee TS 23.018.
Cell IDC,ESee TS 23.018.
Location area IDC,ESee TS 23.018.
Routeing area IDCSee TS 23.003.
Geographical informationCSee TS 23.032.
Geodetic informationC See ITU-T Q.763 [43].
Age of location informationCSee TS 23.018.
Current Location RetrievedCSee TS 23.018.
SGSN numberMGlobal Title of the SGSN. See TS 23.060.
Selected LSA IdentityCThis IE is applicable only if SoLSA is supported by the SGSN.
This IE indicates the LSA identity associated with the current position of the MS. It shall be present if the LSA ID in the subscriber data matches the LSA ID of the current cell. In the case of multiple matches the LSA ID with the highest priority it shall be present. See TS 43.073
User CSG InformationCSee TS 23.060.
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