03.683GPPStage 2TSVoice Group Call Service (VGCS)

3.1 Definitions

Definitions used in the present document are also defined in 3GPP TS 02.68.

For the purposes of the present document, the following terms and definitions apply.

voice group call channel: Combined uplink/downlink to be allocated in a cell of the group call area for a particular voice group call. The uplink can be used by the presently talking service subscriber only. All mobile stations of the listening 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 group call member: Any group member or dispatcher participating in an on going voice group call.

group call attributes: Group call area, dispatcher identities, and the non-activity time which results in the release of the voice group call by the network.

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

group call anchor MSC: The MSC responsible for managing and maintaining a particular voice group 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 group call services where the group call area exceeds one 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 group call services where the group call area exceeds one MSC area.

notification: Notifications are given on common control 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 voice broadcast call on the existence of voice group 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