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1 前言可对移动终端进行通信的移动通信在以前是作为具有单纯功能的系统、或只用于限定目的的系统发展起来的,如手动的内航船舶电话系统、无线呼叫系统(袖珍铃)或城市灾害应急用移动无线电系统等。而用于移动通信的交换机也不过是手动台或是具有简单
1 INTRODUCTION Mobile communications that can be used to communicate with mobile terminals have been developed in the past either as mere functional systems or as a limited purpose only system such as a manual In-Cabin telephone system, a wireless call system (pocket bell) or Urban disaster emergency mobile radio system. The switches used for mobile communications are nothing more than manual stations or simple