3 Definitions, symbols and abbreviations

23.3803GPPIMS Restoration ProceduresRelease 17TS

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 defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905 [1].

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