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一、集群通信系统的特点 移动通信从应用方面可分为公众移动通信网（ＰＭＣＮ）和专用移动通信网。公用移动通信网俗称移动电话；专用移动通信网即集群通信系统（ＴＣＳ），俗称集群电话。 公众移动通信网是为个人提供移动电话业务。由于用户多，容量大，为了提高频率利用率，
First, the characteristics of trunking communications system Mobile communications from the application can be divided into public mobile communications network (PMCN) and private mobile communications network. Common mobile communication network commonly known as mobile phones; dedicated mobile communication network that is trunking communication system (TCS), commonly known as trunked telephone. The public mobile network is for individuals to provide mobile phone services. Due to many users, large capacity, in order to improve frequency utilization,