实现消息收发的模拟软件系统，软件采用基于Socket通讯的客户端/服务器结构，其中客户端表示手机、服务器表示基站，通过用户界面总控开关控制信令收发。-Simulation software to achieve messaging systems, software, Socket communication based client/server architecture, in which the client, said mobile phones, servers, said base