3GPP TS 23.167 V7.2.0 (2006-09)
Contents
Foreword .............................................................................................................................................................5
1 Scope.........................................................................................................................................................6
2 References.................................................................................................................................................6
3 Definitions, symbols and abbreviations....................................................................................................7
3.1 Definitions ...........................................................................................................................................................7
3.2 Abbreviations.......................................................................................................................................................8
4 High level Principles.................................................................................................................................8
4.1 Architectural Principles .......................................................................................................................................8
4.2 Naming and Addressing ....................................................................................................................................10
4.3 Location information for Emergency Sessions .................................................................................................10
4.3.1 General Location Information Principles.....................................................................................................10
4.3.2 Emergency location information for I-WLAN ............................................................................................10
4.4 IP-CAN..............................................................................................................................................................11
5 Architecture model and reference points ................................................................................................11
5.1 Reference architecture .......................................................................................................................................11
5.2 Reference points ................................................................................................................................................12
6 Functional description.............................................................................................................................12
6.1 UE......................................................................................................................................................................12
6.2 IMS Functional entities .....................................................................................................................................12
6.2.1 Proxy-CSCF.................................................................................................................................................12
6.2.2 Emergency-CSCF ........................................................................................................................................13
6.2.3 Location Retrieval Function ........................................................................................................................13
7 Procedures related to establishment of IMS emergency session ............................................................14
7.1 High Level Procedures for IMS Emergency Services.......................................................................................14
7.1.1 UE Detectable Emergency Session..............................................................................................................14
7.1.2 Non UE detectable Emergency Session.......................................................................................................15
7.1.3 Emergency Session Establishment using LRF/RDF....................................................................................15
7.2 IMS Registration for Emergency Session .........................................................................................................16
7.3 Emergency Session Establishment in the Serving IMS network ......................................................................16
7.4 IMS Emergency Session Establishment without Registration ..........................................................................17
7.5 Interworking with PSAP....................................................................................................................................18
7.5.1 PSAP/Emergency centre located at the GSTN ............................................................................................18
7.5.2 PSAP/Emergency centre connected via IP using SIP..................................................................................18
7.5.3 PSAP/Emergency centre connected via ECS...............................................................................................18
7.6 Retrieving Location information for Emergency Session .................................................................................18
7.6.1 Acquiring location information from UE or IMS core ................................................................................18
7.6.2 The UE acquires the location information ...................................................................................................18
7.6.3 The IMS core retrieves the location information.........................................................................................19
Annex A (informative): IMS emergency services using GPRS Network...........................................22
A.1 Requirements on the GPRS network as an IP-CAN..........................................................................................22
A.2 UE specific behaviour for emergency calls over the GPRS..............................................................................22
A.3 GPRS specific aspects of High Level Procedures for IMS emergency calls ....................................................22
A.4 Location handling for GPRS .............................................................................................................................22
A.5 Open Issues on GPRS specific aspects..............................................................................................................23
A.6 Selection of method for UICC-less emergency calls.........................................................................................25
A.6.1 GPRS considerations for IMS Emergency sessions ....................................................................................25
A.6.2 Emergency Calls in absence of UICC for GPRS Access.............................................................................26
Annex B (informative): IMS emergency sessions over 3GPP/WLAN Interworking (I-WLAN) ....27
B.1 Requirements on the I-WLAN network as an IP-CAN.....................................................................................27
B.2 Open Issues on I-WLAN specific aspects .........................................................................................................27
