| 摘要 |
A zone controller is configured to send a first channel grant signal to a base site to assign a call to a first communication channel and then subsequently send a second channel grant signal to the base site upon determining that the call should be reassigned to a second communication channel. The base site, which is coupled to the zone controller, is configured to receive the second channel grant signal, and begin broadcasting the call on the second channel upon receiving the second channel grant signal. Once the call is being broadcast on the second channel, the base site transmits a transition grant signal to the communication units. Upon receiving the transition grant signal, the communication units switch from the first communication channel to the second communication channel. The call is deassigned from the first communication channel to make the first communication channel available for other calls or services.
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