First of all , the development of the digital trunked communication system is summarized , and the technical characteristics of several prevail worldly digital trunked communication systems are compared . in view of the domestic situation , the tetra digital trunked radio communication system is chosen as the studying and developing model . with the study of control technology of softswitch , the protocol of the v + d air interface and the multiple use of channel is analyzed , the base station control unit of the digital trunked communication system is discussed , the calling control flow is designed 本文首先综述了数字集群移动通信系统的发展状况,针对目前国际上流行的数字集群体制的技术特点进行了比较和分析,并根据我国的具体国情选择了tetra数字集群系统作为研究和开发的重点,结合对软交换控制技术的研究和分析,对集群系统重要的v + d空中接口协议及其信道复用进行了较为深入的剖析,对数字集群实验系统的基站控制部分进行了论述,对呼叫控制流程进行了设计。
