第一代移动通信系统(1g)是模拟制式的蜂窝移动通信系统，主要提供话音服务。
The first generation of mobile communication systems (1g) was analog cellular system for mobile communication standard with the main voice services.
与传统的模拟集群移动通信系统相比，TETRA具有更高的频谱利用率，提供更广泛的业务服务。
Compared with the traditional analog trunked ra-dio, TETRA is more spectrum efficient and can provide extensive services.
第一代移动通信系统（1G）是模拟制式的蜂窝移动通信系统，主要提供话音服务。
The first generation of mobile communication (1G) is cellular mobile communication based on analog signal, and it mainly provides voice service.
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