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GSM A900系统分为网络子系统和基站子系统,它的基站子系统(BSS)由基站收发器(BTS)、基站控制器(BSC)、码型变换器(TC)、子多路复用器(SM)、码型变换及子多路复用控制器(TSC)和基站接口单元(BIE)组成.基站子系统的结构见图1所示.下面分几部分介绍该子系统的传输.
GSM A900 system is divided into network subsystem and base station subsystem. Its base station subsystem (BSS) consists of base transceiver station (BTS), base station controller (BSC), code converter (TC), submultiplexer (SM), code conversion and sub-multiplexing controller (TSC) and base station interface unit (BIE) .Basic structure of the base station subsystem shown in Figure 1. The following sections describes the transmission subsystem.