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    • 9. 发明授权
    • Trunked communication system true priority channel scan
    • 集群通信系统真正的优先级通道扫描
    • US4716407A
    • 1987-12-29
    • US945210
    • 1986-12-19
    • Jaime Andres BorrasMichael D. Sasuta
    • Jaime Andres BorrasMichael D. Sasuta
    • H04W84/08H01H67/00H04B7/00
    • H04W84/08
    • While receiving a lower priority message, a remote transceiver unit in a trunked radio communication system is diverted immediately to a priority channel when a priority message is generated. In a first embodiment, a low speed, sub-audible sync word, transmitted by a system controller, causes the remote transceiver to momentarily interrupt the current message and receive priority data transmitted by the system controller. If the priority level of the priority messages exceeds that of the current message, it immediately switches to the priority channel. If not, the remote transceiver reverts to its normal receiving mode and continues its original communication. In a second embodiment, the priority data is transmitted entirely sub-sudible so as to not interrupt the current message. Lastly, in a more basic embodiment, a sub-audible word is transmitted to the remote units causing them to revert to the control channel to receive the priority call assignment. Multi-level message priority is also provided by transmitting sequential priority data words which identify calls of varying priority. The remote units may then respond to the highest priority call.
    • 当接收到较低优先级的消息时,当生成优先级消息时,集群无线电通信系统中的远程收发器单元被立即转移到优先级信道。 在第一实施例中,由系统控制器发送的低速子声音同步字导致远程收发器暂时中断当前消息并接收由系统控制器发送的优先级数据。 如果优先级消息的优先级高于当前消息的优先级,则立即切换到优先级信道。 如果没有,则远程收发器恢复到其正常接收模式并继续其原始通信。 在第二实施例中,优先级数据被完全发送,以便不中断当前消息。 最后,在更基本的实施例中,将子听话字发送到远程单元,使得它们返回到控制信道以接收优先呼叫分配。 通过发送识别不同优先级的呼叫的顺序优先级数据字也提供多级消息优先级。 远程单元然后可以响应最高优先级的呼叫。