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Content for  TS 23.380  Word version:  16.4.0

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0  IntroductionWord‑p. 7

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 TS 23.007 for the CS and PS Domains.
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1  ScopeWord‑p. 8

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.

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]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
TS 23.007: "Restoration procedures".
[3]
TS 29.228: "IP Multimedia (IM) Subsystem Cx and Dx interfaces; Signalling flows and message contents".
[4]
TS 24.008: "Mobile radio interface Layer 3 specification".
[5]
TS 29.213: "Policy and charging control signalling flows and Quality of Service (QoS) parameter mapping".
[6]
TS 29.212: "Policy and Charging Control (PCC); Reference points".
[7]
TS 29.214: "Policy and Charging Control over Rx reference point".
[8]
TS 29.060: "General Packet Radio Service (GPRS); GPRS Tunnelling Protocol (GTP) across the Gn and Gp interface".
[9]
TS 29.061: "Interworking between the Public Land Mobile Network (PLMN) supporting packet based services and Packet Data Networks (PDN)".
[10]
TS 29.274: "3GPP Evolved Packet System. Evolved GPRS Tunnelling Protocol for EPS (GTPv2)".
[11]
RFC 3361:  "Dynamic Host Configuration Protocol (DHCP-for-IPv4) Option for Session Initiation Protocol (SIP) Servers".
[12]
RFC 1034:  "Session Initiation Protocol (SIP): Locating SIP Servers".
[13]
RFC 3319:  "Dynamic Host Configuration Protocol (DHCPv6) Options for Session Initiation Protocol (SIP) Servers".
[14]
RFC 6223:  "Indication of Support for Keep-Alive".
[15]
TS 29.275: "Proxy Mobile IPv6 (PMIPv6) based Mobility and Tunnelling protocols; Stage 3".
[16]
RFC 7077:  "Update Notifications for Proxy Mobile IPv6".
[17]
TS 23.401: "GPRS Enhancements for E-UTRAN Access".
[18]
RFC 3261:  "SIP: Session Initiation Protocol".
[19]
TS 24.229: "IP multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3".
[20]
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]
TS 24.244: "Wireless LAN control plane protocol for trusted WLAN access to EPC; Stage 3".
[23]
RFC 7296:  "Internet Key Exchange Protocol Version 2 (IKEv2)".
[24]
TS 29.273: "Evolved Packet System (EPS); 3GPP EPS AAA interfaces".
[25]
RFC 3588:  "Diameter Base Protocol)".
[26]
RFC 5996  (September 2010): "Internet Key Exchange Protocol Version 2 (IKEv2)".
[27]
TS 23.228: "IP Multimedia Subsystem (IMS); Stage 2".
[28]
TS 23.501: "System Architecture for the 5G System; Stage 2".
[29]
TS 23.502: "Procedures for the 5G System; Stage 2".
[30]
TS 23.503: "Policy and Charging Control Framework for the 5G System; Stage 2".
[31]
TS 29.503: "5G System; Unified Data Management Services; Stage 3".
[32]
TS 29.512: "5G System; Session Management Policy Control Service; Stage 3".
[33]
TS 23.632: "User Data Interworking, Coexistence and Migration; Stage 2".
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3  Definitions, symbols and abbreviationsWord‑p. 9

3.1  Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 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.
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.
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3.2  Abbreviations

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
5GC
5G Core Network
APCO
Additional Protocol Configuration Options
ePCO
Extended Protocol Configuration Options
ePDG
Evolved Packet Data Gateway
IKEv2
Internet Key Exchange Protocol Version 2
LIA
Location Information Answer
LIR
Location Information Request
LMA
Local Mobility Anchor
NBIFOM
Network-Based IP Flow Mobility
PCF
Policy Control Function
PCO
Protocol Configuration Options
PDU
Packet Data Unit
PGW
PDN Gateway
PMIP
Proxy Mobile IP
RCS
Rich Communication Services
SAA
Server Assignment Answer
SAR
Server Assignment Request
SGW
Serving Gateway
SMF
Session Management Function
TWAN
Trusted WLAN Access Network
UAA
User Authorization Answer
UAR
User Authorization Request
UDM
Unified Data Management
UPF
User Plane Function
VoLTE
Voice over LTE
WLAN
Wireless Local Area Network
WLCP
Wireless LAN Control Plane Protocol
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