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TECHNICAL SPECIFICATION
Digital cellular telecommunications system (Phase 2+) (GSM);
Universal Mobile Telecommunications System (UMTS);
LTE;
IMS Restoration Procedures
(3GPP TS 23.380 version 15.0.0 Release 15)
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3GPP TS 23.380 version 15.0.0 Release 15 1 ETSI TS 123 380 V15.0.0 (2018-07)
Reference
RTS/TSGC-0423380vf00
Keywords
GSM,LTE,UMTS
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3GPP TS 23.380 version 15.0.0 Release 15 2 ETSI TS 123 380 V15.0.0 (2018-07)
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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Foreword
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, UMTS identities or
GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables.
The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under
.
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI
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3GPP TS 23.380 version 15.0.0 Release 15 3 ETSI TS 123 380 V15.0.0 (2018-07)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 6
Introduction . 6
1 Scope . 7
2 References . 7
3 Definitions, symbols and abbreviations . 8
3.1 Definitions . 8
3.2 Abbreviations . 8
4 Restoration of Data in the S-CSCF . . 9
4.1 General . 9
4.2 Registration Procedure . 9
4.2.1 Introduction. 9
4.2.2 S-CSCF Restoration after Failure . 9
4.2.3 S-CSCF Restoration during Registration Process . 9
4.3 UE Terminating Procedure . 10
4.3.1 Introduction. 10
4.3.2 S-CSCF Restoration after Restart . 10
4.3.3 S-CSCF Restoration after Failure . 10
4.4 UE Originating Procedure . 11
4.4.1 Introduction. 11
4.4.2 S-CSCF Restoration after Restart . 11
4.4.3 S-CSCF Restoration after Failure . 11
4.5 SIP-AS Originating Procedure . 12
4.5.1 Introduction. 12
4.5.2 S-CSCF Restoration after Restart . 12
4.5.3 S-CSCF Restoration after Failure . 12
4.6 S-CSCF Data Restoration Information Backup and Update Procedures . 12
4.6.1 Introduction. 12
4.6.2 Backup and Update of S-CSCF Restoration Information during Registration Process . 12
4.6.3 Backup and Update of S-CSCF Restoration Information after UE’s Subscription . 13
5 Recovery after P-CSCF failure . 13
5.0 General . 13
5.1 Update PDP context/Bearer at P-CSCF failure . 13
5.1.1 General requirements . 13
5.1.2 Network recovery information flow - Update PDP context / Bearer . 14
5.1.3 Network recovery information flow with S5 PMIP . 15
5.2 Inform UE about P-CSCF failure . 16
5.2.1 General requirements . 16
5.2.2 Network recovery information flow – Inform UE at P-CSCF failure . 16
5.2.3 Network recovery information flow – Inform UE at P-CSCF failure with S5 PMIP . 18
5.3 Network recovery information flow – UE uses keep alive mechanism . 19
5.4 HSS-based P-CSCF restoration for 3GPP access . 20
5.4.1 Introduction. 20
5.4.2 Description . 20
5.4.2.1 General . 20
5.4.2.2 P-CSCF restart/failure detection by S-CSCF . 22
5.4.2.2.1 General . 22
5.4.2.2.2 Direct connection from S-CSCF to P-CSCF . 22
5.4.2.2.3 S-CSCF connection to P-CSCF via IBCF/ATCF . 22
5.4.2.3 MME/SGSN mechanism support . 22
5.4.3 PCO-based optional extension . 23
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3GPP TS 23.380 version 15.0.0 Release 15 4 ETSI TS 123 380 V15.0.0 (2018-07)
5.4.3.1 Introduction . 23
5.4.3.2 Description . 23
5.4.4.3 UE indication of support for "Update PDP context/bearer at P-CSCF failure" Restoration . 25
5.4.5 Coexistence with "Update PDP context/bearer at P-CSCF failure" mechanism . 25
5.4.6 HSS based P-CSCF restoration in roaming scenarios . 25
5.5 PCRF-based P-CSCF restoration . 25
5.5.1 Introduction. 25
5.5.2 PCRF-based P-CSCF restoration information flow - deactivate PDN connection/PDP context . 26
5.5.3 PCO-based optional extension . 29
5.5.3.1 Introduction . 29
5.5.3.2 Description . 29
5.5.3.3 UE indication of support for "Update PDP context/bearer at P-CSCF failure" Restoration . 29
5.5.4 Coexistence with "Update PDP context/bearer at P-CSCF failure" mechanism . 29
5.5.5 P-CSCF restoration in roaming scenarios for PCRF based solution . 29
5.6 P-CSCF restoration for WLAN . 30
5.6.1 Introduction. 30
5.6.2 Basic mechanism for the HSS-based solution . 30
5.6.2.1 Overview and principles . 30
5.6.2.2 Description . 30
5.6.3 Basic mechanism for the PCRF-based solution . 32
5.6.4 Optional extension for the HSS and PCRF-based solutions for the TWAN access . 32
5.6.4.1 Overview and principles . 32
5.6.4.2 Description . 33
5.6.4.3 Indication of UE support of the P-CSCF restoration extension for the TWAN access . 34
5.6.5 Optional extension for the HSS and PCRF-based solutions for the untrusted WLAN access . 34
5.6.5.1 Overview and principles . 34
5.6.5.2 Description . 34
5.6.5.3 Indication of UE support of the P-CSCF restoration extension for the untrusted WLAN access . 36
5.6.6 Supported features and capabilities . 36
5.6.6.1 Introduction . 36
5.6.6.2 Feature support in the HSS and S-CSCF . 36
5.6.6.3 Feature support in the 3GPP AAA Server . 36
5.6.6.4 Feature support in the PGW . 37
5.6.6.5 Feature support in the TWAN . 37
5.6.6.6 Feature support in the ePDG . 37
5.6.6.7 Capability support in the UE . 37
5.7 Interaction between P-CSCF restoration and NBIFOM . 37
5.7.1 Introduction. 37
5.7.2 HSS-based solution . 38
5.7.3 PCRF-based solution . 39
5.8 P-CSCF Restoration for 5GC . 39
5.8.1 Introduction. 39
5.8.2 Common Procedures for P-CSCF Restoration in 5GC . 39
5.8.2.1 General . 39
5.8.2.2 P-CSCF Address List Update Procedure. 39
5.8.2.3 DHCP based P-CSCF Selection Triggering Procedure . 40
5.8.2.4 PDU Session Release with Reactivation Procedure . 41
5.8.3 P-CSCF Failure Detection at SMF/UPF . 42
5.8.3.1 Overview and Principles . 42
5.8.3.2 P-CSCF Monitoring and Failure Detection Procedure . 42
5.8.4 UDM/HSS Based P-CSCF Restoration . 43
5.8.4.1 Overview and principles . 43
5.8.4.2 Trigger P-CSCF Restoration Procedure via SMF . 43
5.8.4.3 Trigger P-CSCF Restoration Procedure via AMF. 45
5.8.5 PCF Based P-CSCF Restoration . 46
5.8.5.1 Introduction . 46
5.8.5.2 Trigger P-CSCF Restoration Procedure via PCF . 46
6 Recovery after SCC AS failure . 47
6.1 General . 47
6.2 General Procedure . 47
6.2.1 Enhanced Third Party Registration Procedure . 47
ETSI
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3GPP TS 23.380 version 15.0.0 Release 15 5 ETSI TS 123 380 V15.0.0 (2018-07)
6.2.1.1 Introduction . 47
6.2.1.2 Description . 47
6.2.2 Enhanced Service Request Procedure . 49
6.2.2.1 Introduction . 49
6.2.2.2 Description . 49
Annex A (informative): Change history . 50
History . 52
ETSI
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3GPP TS 23.380 version 15.0.0 Release 15 6 ETSI TS 123 380 V15.0.0 (2018-07)
Foreword
rd
This Technical Specification has been produced by the 3 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.
Introduction
Although network nodes in the IMS Core Network should have a very high availability, some maintenance downtime
and occasional failures are unavoidable. Communication links although designed with robust protocols between the
network elements are also subject to failures. This document specifies a set of standardized procedures for automatic
restoration after loss or corruption of data reducing the impact of these problems in order to improve service to the
users. The scenarios covered here for the IMS Domain are similar to those covered in 3GPP TS 23.007 [2] for the CS
and PS Domains.
ETSI
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3GPP TS 23.380 version 15.0.0 Release 15 7 ETSI TS 123 380 V15.0.0 (2018-07)
1 Scope
The present document specifies the procedures required in 3GPP IMS to handle a S-CSCF or a P-CSCF service
interruption scenario with minimum impact to the service to the end user.
NOTE: IMS Restoration Procedures covering service interruption of other network elements are not defined in this
version of the specification.
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 TR 21.905: "Vocabulary for 3GPP Specifications".
[2] 3GPP TS 23.007: "Restoration procedures".
[3] 3GPP TS 29.228: "IP Multimedia (IM) Subsystem Cx and Dx interfaces; Signalling flows and
message contents".
[4] 3GPP TS 24.008: "Mobile radio interface Layer 3 specification".
[5] 3GPP TS 29.213: "Policy and charging control signalling flows and Quality of Service (QoS)
parameter mapping".
[6] 3GPP TS 29.212: "Policy and Charging Control (PCC); Reference points".
[7] 3GPP TS 29.214: "Policy and Charging Control over Rx reference point".
[8] 3GPP TS 29.060: "General Packet Radio Service (GPRS); GPRS Tunnelling Protocol (GTP)
across the Gn and Gp interface".
[9] 3GPP TS 29.061: "Interworking between the Public Land Mobile Network (PLMN) supporting
packet based services and Packet Data Networks (PDN)".
[10] 3GPP TS 29.274: "3GPP Evolved Packet System. Evolved GPRS Tunnelling Protocol for EPS
(GTPv2)".
[11] IETF RFC 3361: "Dynamic Host Configuration Protocol (DHCP-for-IPv4) Option for Session
Initiation Protocol (SIP) Servers".
[12] IETF RFC 1034: "Session Initiation Protocol (SIP): Locating SIP Servers".
[13] IETF RFC 3319: "Dynamic Host Configuration Protocol (DHCPv6) Options for Session Initiation
Protocol (SIP) Servers".
[14] IETF RFC 6223: "Indication of Support for Keep-Alive".
[15] 3GPP TS 29.275: "Proxy Mobile IPv6 (PMIPv6) based Mobility and Tunnelling protocols; Stage
3".
[16] IETF RFC 7077: "Update Notifications for Proxy Mobile IPv6".
[17] 3GPP TS 23.401: "GPRS Enhancements for E-UTRAN Access".
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3GPP TS 23.380 version 15.0.0 Release 15 8 ETSI TS 123 380 V15.0.0 (2018-07)
[18] IETF RFC 3261: "SIP: Session Initiation Protocol".
[19] 3GPP TS 24.229: "IP multimedia call control protocol based on Session Initiation Protocol (SIP)
and Session Description Protocol (SDP); Stage 3".
[20] 3GPP TS 23.060: "General Packet Radio Service (GPRS); Service description; Stage 2".
[21] GSMA PRD IR.65: "IMS Roaming and Interworking Guidelines, version 14.0".
[22] 3GPP TS 24.244: "Wireless LAN control plane protocol for trusted WLAN access to EPC;
Stage 3".
[23] IETF RFC 7296: "Internet Key Exchange Protocol Version 2 (IKEv2)".
[24] 3GPP TS 29.273: "Evolved Packet System (EPS); 3GPP EPS AAA interfaces".
[25] IETF RFC 3588: "Diameter Base Protocol)".
[26] IETF RFC 5996 (September 2010): "Internet Key Exchange Protocol Version 2 (IKEv2)".
[27] 3GPP TS 23.228: "IP Multimedia Subsystem (IMS); Stage 2".
[28] 3GPP TS 23.501: "System Architecture for the 5G System; Stage 2".
[29] 3GPP TS 23.502: "Procedures for the 5G System; Stage 2".
[30] 3GPP TS 23.503: "Policy and Charging Control Framework for the 5G System; Stage 2".
[31] 3GPP TS 29.503: "5G System; Unified Data Management Services; Stage 3".
3 Definitions, symbols and abbreviations
3.1 Definitions
For the purposes of the present document, the terms and definitions given in TR 21.905 [1] and the following apply. A
term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905 [1].
Service Interruption: A period of time in which one or more network elements do not respond to requests and do not
send any requests to the rest of the system.
S-CSCF Restoration Information: Information required for the S-CSCF to handle traffic for a registered user. This
information is stored in HSS and if lost, retrieved by the S-CSCF.
3.2 Abbreviations
For the purposes of the present document, the abbreviations given in TR 21.905 [1] and the following apply. An
abbreviation define
...