谈谈集群通信系统（下）郑祖辉五、与常规移动通信的比较常规移动通信组成和呼叫阻塞示意图如图５所示。用户通话时，双方均使用固定频率，若通话时该信道被占用，就无法自动选择其它空闲信道工作。集群通信系统则弥补了常规移动通信的不足，它的组成和呼叫示意图如图６所... Talk about the cluster communication system (below) Zheng Zuhui Fifth, compared with the conventional mobile communication Conventional mobile communication composition and call blocking diagram shown in Figure 5. When a user calls, both parties use a fixed frequency. If the channel is occupied during a call, it will not be able to automatically select another idle channel. Cluster communication system is to make up for the lack of conventional mobile communications, its composition and call diagram shown in Figure 6 ...