| 摘要 |
A radio network has a plurality of base stations each located at a respective base site and a central controller that coordinates multicast group calls among mobile units that are served by the stations, and assists movement of the units between base sites during calls. The controller monitors radio traffic flows at each base station serving a common group call, instructs transmission of a first assist signal by a first base station that serves the call, and instructs transmission of one or more second assist signals by respective second stations that serve the call and are in sites adjacent the first station.
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