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本文叙述了目前国际上普遍采用的改进型移动电话系统(IMTS)的特点和组成,说明该系统在移动台呼叫有线电话,有线电话呼叫移动台等全过程的基本工作原理。并结合时序图来说明各阶段的信令格式及作用,以求对 IMTS 工作原理有一个基本了解。
This article describes the characteristics and composition of IMTS, which is commonly used in the world at present, and shows the basic working principle of the system in the whole process of calling landline, landline calling mobile stations in the mobile station. Combined with the timing diagram to illustrate the various stages of the signaling format and role in order to have a basic understanding of IMTS working principle.