3 Definitions and abbreviations

29.1683GPPCell Broadcast Centre interfaces with the Evolved Packet CoreRelease 17Stage 3TS

3.1 Definitions

For the purposes of the present document, the terms and definitions given in 3GPP 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 3GPP TR 21.905 [1].

Elementary Procedure: SBc-AP consists of Elementary Procedures (EPs). An Elementary Procedure is a unit of interaction between MME and CBC. These Elementary Procedures are defined separately and are intended to be used to build up complete sequences in a flexible manner. If the independence between some EPs is restricted, it is described under the relevant EP description. Unless otherwise stated by the restrictions, the EPs may be invoked independently of each other as stand alone procedures, which can be active in parallel. Examples on using several SBc-APs together with each other and EPs from other interfaces can be found in reference [FFS].

An EP consists of an initiating message and possibly a response message. Two kinds of EPs are used:

– Class 1: Elementary Procedures with response (success and/or failure).

– Class 2: Elementary Procedures without response.

For Class 1 EPs, the types of responses can be as follows:

Successful:

– A signalling message explicitly indicates that the elementary procedure successfully completed with the receipt of the response.

Unsuccessful:

– A signalling message explicitly indicates that the EP failed.

– On time supervision expiry (i.e. absence of expected response).

Successful and Unsuccessful:

– One signalling message reports both successful and unsuccessful outcome for the different included requests. The response message used is the one defined for successful outcome.

Class 2 EPs are considered always successful.

3.2 Abbreviations

For the purposes of the present document, the abbreviations given in 3GPP 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 3GPP TR 21.905 [1].

5GC 5G Core

CMAS Commercial Mobile Alert System

CBC Cell Broadcast Center

CBS Cell Broadcast Service

EPC Evolved Packet Core

EPS Evolved Packet System

ETWS Earthquake and Tsunami Warning System

MME Mobility Management Entity

PWS Public Warning System

PWS-IWF PWS – Inter Working Function

SCTP Stream Control Transmission Protocol