ETSI TS 123 167 V15.5.0 (2019-10)

Universal Mobile Telecommunications System (UMTS); LTE; IP Multimedia Subsystem (IMS) emergency sessions (3GPP TS 23.167 version 15.5.0 Release 15)

RTS/TSGS-0223167vf50

General Information

• Status: Published
• Publication Date: 30-Sep-2019
• Technical Committee: 3GPP SA 2 - Architecture
• Current Stage: 12 - Completion
• Completion Date: 01-Oct-2019

Standards Content (Sample)

ETSI TS 123 167 V15.5.0 (2019-10)






TECHNICAL SPECIFICATION
Universal Mobile Telecommunications System (UMTS);
LTE;
IP Multimedia Subsystem (IMS) emergency sessions
(3GPP TS 23.167 version 15.5.0 Release 15)

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3GPP TS 23.167 version 15.5.0 Release 15 1 ETSI TS 123 167 V15.5.0 (2019-10)



Reference
RTS/TSGS-0223167vf50
Keywords
LTE,UMTS
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3GPP TS 23.167 version 15.5.0 Release 15 2 ETSI TS 123 167 V15.5.0 (2019-10)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
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Legal Notice
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
The present document may refer to technical specifications or reports using their 3GPP identities. These shall be
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Modal verbs terminology
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"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI

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3GPP TS 23.167 version 15.5.0 Release 15 3 ETSI TS 123 167 V15.5.0 (2019-10)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 6
1 Scope . 7
2 References . 7
3 Definitions, symbols and abbreviations . 9
3.1 Definitions . 9
3.2 Abbreviations . 11
4 High level Principles . 11
4.1 Architectural Principles . 11
4.2 Naming and Addressing . 14
4.3 Location information for Emergency Sessions. 14
4.3.1 General Location Information Principles . 15
4.3.2 Void . 15
4.4 IP-CAN . 15
4.5 Media . 16
5 Architecture model and reference points . 16
5.1 Reference architecture . 16
5.2 Reference points . 17
6 Functional description . 17
6.1 UE . 17
6.2 IMS Functional entities . 19
6.2.1 Proxy-CSCF . 19
6.2.2 Emergency-CSCF . 20
6.2.3 Location Retrieval Function . 20
6.2.4 Serving-CSCF . 21
6.2.5 Void . 22
6.2.6 Emergency Access Transfer Function (EATF) . 22
6.2.7 Interrogating-CSCF . 22
6.2.8 AS . 22
6.2.9 HSS . 22
6.2.10 Media Gateway Control Function (MGCF) . 22
6.2.11 MSC Server enhanced with ICS . 22
6.2.12 IBCF . 23
7 Procedures related to establishment of IMS emergency session . 23
7.1 High Level Procedures for IMS Emergency Services . 23
7.1.1 UE Detectable Emergency Session . 23
7.1.2 Non UE detectable Emergency Session . 24
7.1.3 Emergency Session Establishment using LRF/RDF . 25
7.2 IMS Registration for Emergency Session . 26
7.3 Emergency Session Establishment in the Serving IMS network . 26
7.4 IMS Emergency Session Establishment without Registration . 28
7.5 Interworking with PSAP . 28
7.5.1 PSAP/Emergency centre located at the GSTN . 28
7.5.2 PSAP/Emergency centre connected via IP using SIP . 28
7.5.3 PSAP/Emergency centre connected via ECS . 28
7.5.4 PSAP supporting NG-eCall . 28
7.6 Retrieving Location information for Emergency Session . 29
7.6.1 Acquiring location information from the UE or the network . 29
7.6.2 Void . 31
7.6.3 Void . 31
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3GPP TS 23.167 version 15.5.0 Release 15 4 ETSI TS 123 167 V15.5.0 (2019-10)
7.7 Transfer of MSD for eCall . 31
7.7.1 MSD Transfer/Acknowledgement during Session Establishment with PSAP supporting NG-eCall . 31
7.7.2 MSD Transfer/Acknowledgement during Session Establishment with a PSAP Not supporting NG-
eCall (inband means) . 32
7.7.3 Transfer of an updated MSD. 33
Annex A (informative): Void . 35
Annex B (informative): Void . 36
Annex C (normative): IMS emergency services using Fixed Broadband Access . 37
C.1 Location Retrieval for emergency services over fixed broadband access . 37
C.1.1 High Level Principles for Emergency location information for fixed broadband access . 37
C.1.2 Retrieval of location information for emergency services over fixed broadband access . 38
Annex D (informative): Examples of call flows according to NENA I2 recommendations . 39
D.1 ECS redirecting IMS emergency call . 39
D.2 ECS routes the emergency call to the gateway with record route . 41
Annex E (informative): Emergency support in different IP-CANs . 43
Annex F (normative): IMS Emergency Services Using HRPD/PDS Network . 44
F.1 cdma2000 HRPD/PDS Options . 44
F.2 Requirements on the HRPD Network as an IP-CAN . 44
F.3 Information Flows . 44
Annex G (informative): TEL-URI provisioning considerations for IMS emergency call back . 45
Annex H (normative): IMS emergency services using UTRAN, E-UTRAN and NG-RAN
radio access network . 46
H.1 General . 46
H.2 UE specific behaviour . 46
H.3 High Level Procedures for IMS emergency calls . 47
H.4 Location handling . 47
H.5 Domain Priority and Selection Rules for Emergency Session Attempts . 48
H.6 eCall over IMS . 51
Annex I (normative): IMS Emergency Services Using HRPD/EPC Network . 53
I.1 cdma2000 HRPD/EPC Options . 53
I.2 Requirements on the HRPD/EPC Network as an IP-CAN. 53
I.3 Information Flows . 53
Annex J (normative): IMS emergency services using WLAN access to EPC . 54
J.1 General . 54
J.2 UE specific behaviour . 54
J.3 High Level Procedures for IMS emergency calls . 55
J.4 Location handling . 56
Annex K (normative): Support of IMS emergency sessions for roaming users in
deployments without IMS-level roaming interfaces . 57
K.1 General . 57
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3GPP TS 23.167 version 15.5.0 Release 15 5 ETSI TS 123 167 V15.5.0 (2019-10)
K.2 Functional description . 57
K.2.1 General . 57
K.2.2 P-CSCF . 57
K.2.3 PCRF . 57
K.2.4 PGW . 57
K.2.4 HSS . 57
K.3 IMS Emergency Registration and Session Establishment . 58
K.4 Non UE detectable Emergency Session . 59
Annex L (normative): IMS emergency services using untrusted non-3GPP access to 5GC . 61
L.1 General . 61
L.2 UE specific behaviour . 61
L.3 High Level Procedures for IMS emergency calls . 62
L.4 Location handling . 63
Annex M (informative): Change history . 64
History . 67

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3GPP TS 23.167 version 15.5.0 Release 15 6 ETSI TS 123 167 V15.5.0 (2019-10)
Foreword
This Technical Specification has been produced by the 3rd Generation Partnership Project (3GPP).
The contents of the present document are subject to continuing work within the TSG and may change following formal
TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an
identifying change of release date and an increase in version number as follows:
Version x.y.z
where:
x the first digit:
1 presented to TSG for information;
2 presented to TSG for approval;
3 or greater indicates TSG approved document under change control.
y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,
updates, etc.
z the third digit is incremented when editorial only changes have been incorporated in the document.
ETSI

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3GPP TS 23.167 version 15.5.0 Release 15 7 ETSI TS 123 167 V15.5.0 (2019-10)
1 Scope
This document defines the stage 2 service description for emergency services in the IP Multimedia Core Network
Subsystem (IMS), including the elements necessary to support IP Multimedia (IM) emergency services and IM
emergency services for eCall. ITU-T Recommendation I.130 [4] describes a three-stage method for characterisation of
telecommunication services, and ITU-T Recommendation Q.65 [3] defines stage 2 of the method.
This document covers also the Access Network aspects that are crucial for the provisioning of IMS emergency services.
Other 3GPP specifications that are related to the IMS emergency services are TS 23.228 [1] on IMS in general,
including fixed broadband access aspects, TS 23.060 [2] describing GPRS (UTRAN): TS 23.401 [28] describing EPS
(UTRAN and E-UTRAN); TS 23.402 [29] describing Non 3GPP access (WLAN) to EPC; TS 23.271 [5] that covers
location services; TS 23.216 [31] and TS 23.237 [32] describing Single Radio Voice Call Continuity (SRVCC) and
Dual Radio Voice Call Continuity (DRVCC) for IMS Emergency session, TS 23.292 [45] describing the use of IMS
services when using CS access for the media bearer and TS 23.501 [48] and TS 23.502 [49] describing support of
emergency services and location for 5GS. TS 25.301 [6] contains an overall description of the UMTS Terrestrial Radio
Access Network; TS 36.300 [30] contains an overall description of the Evolved Universal Terrestrial Radio Access (E-
UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); and TS 38.300 [50] contains an overall
description of the Next Generation Radio Access Network (NG-RAN). Other non-3GPP specifications that are related
to the IMS emergency services include 3GPP2 cdma2000 HRPD IP-CAN, as specified in 3GPP2 X.S0060 [25] when
the UE is connected to a PDS core network and 3GPP2 X.S0057-A [39] when the UE is connected to an EPC core
network.
The emergency support in different IP-CANs is described in the Informative Annex E.
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
- References are either specific (identified by date of publication, edition number, version number, etc.) or
non-specific.
- For a specific reference, subsequent revisions do not apply.
- For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including
a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same
Release as the present document.
[1] 3GPP TS 23.228: "3rd Generation Partnership Project; Technical Specification Group Services
and Systems Aspects; IP Multimedia Subsystem (IMS); Stage 2".
[2] 3GPP TS 23.060: "3rd Generation Partnership Project; Technical Specification Group Services
and Systems Aspects; General Packet Radio Service (GPRS); Service description; Stage 2".
[3] CCITT Recommendation Q.65: "Methodology – Stage 2 of the method for the characterisation of
services supported by an ISDN".
[4] ITU Recommendation I.130: "Method for the characterization of telecommunication services
supported by an ISDN and network capabilities of an ISDN".
[5] 3GPP TS 23.271: "3rd Generation Partnership Project; Technical Specification Group Services
and Systems Aspects; Functional stage 2 description of LCS".
[6] 3GPP TS 25.301: "3rd Generation Partnership Project; Technical Specification Group Radio
Access Network; Radio Interface Protocol Architecture".
[7] Void.
[8] 3GPP TS 22.101: "3rd Generation Partnership Project; Technical Specification Group Services
and Systems Aspects; Service aspects; Service principles".
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3GPP TS 23.167 version 15.5.0 Release 15 8 ETSI TS 123 167 V15.5.0 (2019-10)
[9] IETF RFC 3825: "Dynamic Host Configuration Protocol Option for Coordinate-based Location
Configuration Information".
[10] IETF RFC 4676: "Dynamic Host Configuration Protocol (DHCPv4 and DHCPv6) Option for
Civic Addresses Configuration Information ".
[11] 3GPP TR 21.905: "3rd Generation Partnership Project; Technical Specification Group Services
and System Aspects; Vocabulary for 3GPP Specifications".
[12] 3GPP TS 23.002: "3rd Generation Partnership Project; Technical Specification Group Services
and Systems Aspects; Network architecture".
[13] 3GPP TS 24.008: "3rd Generation Partnership Project; Technical Specification Group Core
Network and Terminals; Mobile radio interface Layer 3 specification; Core network protocols;
Stage 3".
[14] IETF RFC 4119: "A Presence-based GEOPRIV Location Object Format".
[15] OMA AD SUPL: "Secure User Plane Location Architecture", http://www.openmobilealliance.org.
[16] OMA TS ULP: "User Plane Location Protocol", http://www.openmobilealliance.org.
[17] NENA I2 architecture: "Interim VoIP Architecture for Enhanced 9-1-1 Services (i2)".
[18] ETSI ES 282 004: "Protocols for Advanced Networking (TISPAN); NGN Functional Architecture;
Network Attachment Sub-System (NASS)".
[19] 3GPP TS 24.229: "IP multimedia call control protocol based on SIP and SDP; stage 3".
[20] 3GPP TS 23.203: "Policy and Charging Control architecture".
[21] 3GPP TS 23.003: "Numbering, addressing and identification".
[22] Void.
[23] ANSI/J-STD-036-B: "Enhanced Wireless 9-1-1, Phase 2".
[24] 3GPP2 X.S0002-0: "MAP Location Services Enhancements".
[25] 3GPP2 X.S0060: "HRPD Support for Emergency Service".
[26] 3GPP TS 22.003: "Circuit Teleservices supported by a Public Land Mobile Network (PLMN)".
[27] 3GPP TS 22.228: "Service requirements for the Internet Protocol (IP) multimedia core network
subsystem; Stage 1".
[28] 3GPP TS 23.401: "General Packet Radio Service (GPRS) enhancements for Evolved Universal
Terrestrial Radio Access Network (E-UTRAN) access".
[29] 3GPP TS 23.402: "Architecture enhancements for non-3GPP accesses".
[30] 3GPP TS 36.300: "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal
Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2".
[31] 3GPP TS 23.216: "Single Radio Voice Call Continuity (SR VCC); Stage 2".
[32] 3GPP TS 23.237: "IP Multimedia Subsystem (IMS) Service Continuity; Stage 2".
[33] 3GPP TS 24.301: "General Packet Radio Service (GPRS) enhancements for Evolved Universal
Terrestrial Radio Access Network (E-UTRAN) access".
[34] 3GPP TS 26.114: "IP Multimedia Subsystem (IMS); Multimedia telephony; Media handling and
interaction".
[35] 3GPP TS 32.260: "Telecommunication management; Charging management; IP Multimedia
Subsystem (IMS) charging".
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3GPP TS 23.167 version 15.5.0 Release 15 9 ETSI TS 123 167 V15.5.0 (2019-10)
[36] ETSI TS 181 019 V2.0.0: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); Business Communication Requirements".
[37] ETSI TS 182 024 v.2.1.1: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); Hosted Enterprise Services; Architecture, functional description
and signalling".
[38] ETSI TS 182 025 v.2.1.1: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); Business trunking; Architecture and functional description".
[39] 3GPP2 X.S0057-C v1.0: "E-UTRAN - eHRPD Connectivity and Interworking: Core Network
Aspects".
[40] NENA 08-002, Version 1.0 (i3): "NENA Functional and Interface Standards for Next Generation
9-1-1".
[41] 3GPP TS 23.122: "Non-Access-Stratum (NAS) functions related to Mobile Station (MS) in idle
mode".
[42] 3GPP TS 26.267: "Digital cellular telecommunication systems (Phase 2+); Universal Mobile
Telecommunication System (UMTS); eCall data transfer; In-band modem solution General
description".
[43] 3GPP TS 23.328:
...