Patent ID: 7453837
Filing Date: 2008-11-18
Classification: H04W

Abstract:
1. A CDMA communication system, comprising: a plurality of base transceiver stations spatially distributed to communicate with mobile communication devices via radio links; a plurality of base station controllers, each coupled to a plurality of base transceiver stations; a mobile switching center connected to couple said base station controllers to a public telephone network; a data communication system comprising (1) a plurality of packet control function devices respectively connected to said base station controllers to transmit data packets to and from the mobile communication devices via said base transceiver stations, and (2) a packet data serving node connected to said packet control function devices to provide packet data services to the-mobile communication devices; and a trunking system comprising (1) a plurality of dispatching clients respectively connected to said base station controllers to transmit data packets of group calls to and from mobile communication devices of groups of subscribers where members of each group share a common trunking data link for transmission of data packets, and (2) at least one dispatching server connected to said packet data network to communicate with said dispatching clients, wherein said dispatching server and said dispatching clients are operable in combination to provide a push-to-talk function for a group call within each group.