3 Definitions and abbreviations

03.693GPPStage 2TSVoice Broadcast Service (VBS)

3.1 Definitions

Definitions used in the present document are also defined in 3GPP TS 02.69.

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.

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

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

Broadcast call attributes: Group call area, dispatcher identities.

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

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 voice broadcast services where the group call area exceeds an MSC area, the group call anchor MSC is predefined in the network.

Group call relay MSC: 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.

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).

3.2 Abbreviations

Abbreviations used in the present document are also listed in 3GPP TS 21.905.

For the purposes of the present document, the following abbreviations apply:

eMLPP enhanced Multi-Level Precedence and Pre-emption

GCR Group Call Register

NCH Notification Channel

VBS Voice Broadcast Service

VGCS Voice Group Call Service