PTT METHOD FOR EFFICIENTLY SUPPORTING MULTIPLE SIMULTANEOUS GROUP PTT CALLS REQUIRING LOW CALL SETUP LATENCY

摘要

The present disclosure relates to group communications on multicast services. The user equipment (UE) sends a registration request indicating the communication group (s) of interest to the UE to the server, receives a message indicating a set of communication groups to which the pre-established multicast resources are assigned, Receives the call identifiers mapped to the group identifiers of each communication group in the set of communication groups, stores the mapping of call identifiers to group identifiers, and maintains group call sessions for the set of communication groups. The server receives the registration request, determines that the UE is provisioned for pre-established group calls, retrieves the group identifiers for the communication groups, maps the call identifiers to the group identifiers, Notifies the UEs of call identifiers, and allocates multiple group calls on the pre-established multicast resources.