3 Definitions and abbreviations

3GPP43.069Release 17Stage 2TSVoice Broadcast Service (VBS)

3.1 Definitions

For the purposes of the present document, the terms and definitions given in 3GPP TS 42.069 and the following apply:

Broadcast call attributes: group call area, dispatcher identities

Group call anchor MSC: the MSC responsible for managing and maintaining a particular voice broadcast call. The group call anchor MSC is determined as the one controlling the cells of the group call area (see also group call relay MSC). For a voice broadcast call where the group call area exceeds an MSC area, the group call anchor MSC is predefined in the network. In a RANflex configuration with group call redundancy, the group call anchor MSC redundancy pool (instead of a group call anchor MSC) is predefined in a network for a given voice broadcast call.

Group members: service subscribers entitled to belong to a particular group classified by a certain group identification (group ID)

Group Call Register (GCR): functionality in the network containing the broadcast call attributes

group call serving MSC: In a RANflex configuration the group call serving MSC of a location area is a group call anchor MSC or a group call relay MSC that controls the group call signalling for this location area. A location area within the pool area has a unique group call serving MSC, or – in a RANflex configuration with group call redundancy – a unique group call serving MSC redundancy pool. For a given broadcast call at any location, the group call serving MSC is either the anchor MSC or one of the relay MSCs controlling the broadcast call. For a service subscriber located in this location area the visited MSC may be different from the location area’s group call serving MSC.

In a RANflex configuration all location areas within a BSC service area are assigned to the same group call serving MSC.

In a RANflex configuration with group call redundancy all location areas within a BSC service area are assigned to the same group call serving MSC redundancy pool.

Group call relay MSC: the MSC controlling cells of a group call area which are not under control of the group call anchor MSC for those voice broadcast services where the group call area exceeds one MSC area. For a voice broadcast call where the group area exceeds one MSC area, the address of the group call relay MSC is pre-configured in the anchor MSC’s GCR. In a RANflex configuration with group call redundancy this preconfigured address identifies a group call relay MSC redundancy pool (instead of a group call relay MSC).

group call serving MSC redundancy pool: A pool of group call serving MSCs each of which can take the same role for a given broadcast call (anchor /relay) and serve the same location areas within a RANflex pool area with broadcast call services. For a given voice broadcast call a location area’s group call serving MSC redundancy pool is either the group call anchor MSC redundancy pool or one of the group call relay MSC redundancy pools.

group call anchor MSC redundancy pool: A group call serving MSC redundancy pool. Each MSC within the group call anchor MSC redundancy pool can take the role of the group call anchor MSC for a given broadcast call. For a given instance of a voice broadcast call one group call anchor MSC is selected from the group call anchor MSC redundancy pool.

group call relay MSC redundancy pool: A group call serving MSC redundancy pool. Each MSC within the group call relay MSC redundancy pool can take the role of the group call relay MSC for a given broadcast call. For a given instance of a voice broadcast call one group call relay MSC is selected from every relevant group call relay MSC redundancy pool.

Notification: notifications are given on common channels or dedicated channels in order to inform group members which are either in idle mode or in dedicated mode or participating in a voice group call or broadcast call on the existence of voice broadcast calls

Notification CHannel (NCH): Common control channel on which the notifications are sent by the network (equivalent to a paging channel).

Originator-to-dispatcher information: information sent by the service subscriber originating a voice broadcast call to the network during call setup for distribution to the dispatchers to be attached to the voice broadcast call during call

RANflex configuration: A network configuration that allows a location area to be served by multiple MSCs in parallel. For details see 3GPP TS 23.236 [15]. In a RANflex configuration a given location area is associated with a single group call serving MSC. There is no support of group call redundancy.

RANflex configuration with group call redundancy: A RANflex configuration where a given location area is associated with a group call serving MSC redundancy pool (instead of with a single group call serving MSC). For a given voice broadcast call a location area’s group call serving MSC redundancy pool may be a group call anchor MSC redundancy pool or a group call relay MSC redundancy pool.

Voice broadcast call member: any group member or dispatcher participating in an on going voice broadcast call

Voice broadcast channel: downlink to be allocated in each cell of the group call area for a particular voice broadcast call
All mobile stations of the destination subscriber being service subscribers in one cell shall listen to the common downlink.

3.2 Abbreviations

For the purposes of the present document, the abbreviations given in 3GPP TR 21.905 and the following apply:

AoIP A over IP, using IP as the bearer of the user plane of A interface.

AMR Adaptive Multi-Rate

CC Country Code

EFR Enhanced Full Rate

eMLPP enhanced Multi-Level Precedence and Pre-emption

GCR Group Call Register

NCH Notification Channel

NDC National Destination Code

SN Subscriber Number

VBS Voice Broadcast Service

VGCS Voice Group Call Service