Design and implementation of packet-switched domain link for group call communication based on TD-SCDMA network

Group call communication can meet the demand of the different location users sharing the same information at the same time. In TD-SCDMA network, the group call communication is realized by the high-speed packet-switched domain (PS). TD-SCDMA network can provide a wide communication range and other multimedia services for the group call user. The group call communication includes the group call service and the presence service. The presence service is to achieve the efficient, reliable and fast connection of the group call service. In view of the communication features of group call service, the limited PS resources and the non realtime packet switching, TD-SCDMA network structure which supports the group call service is designed. At the same time, the functions of packet-switched domain equipments are described. Then it is a focused discussion that TD-SCDMA system adopts packet data link allocation mechanism for group call service. The PS protocols of the group call communication are given in detail. Finally, the group call communication is simulated by using OPNET software. The performance of group call and the impact on TD-SCDMA network PS are analyzed. The result shows that the PS resources can be efficiently shared by group call members after adopting the rational network structure and PS access mechanism. It provides technical support for the development of group call service based on TD-SCDMA network.