数字集群移动通信系统作为专用移动通信的高级阶段，受到了广泛的关注。
Digital trunk mobile system is the advanced level of the special mobile communication, and it has attracted attention abroad.
根据市场预测的结果，论文对重庆市数字集群移动通信网络进行了具体规划设计。
On the basis of market forecast results, the paper marks out Chongqing digital trunking mobile communication networks.
研究了陆地集群无线通信（TETRA）数字集群移动通信系统的语音压缩编解码算法的基本原理。
This paper describes the basic theory of speech compression encoding and decoding algorithm in TETRA (terrestrial trunked radio) system.
针对数字集群移动通信系统，提出一种新的随机预约控制方式，减小了预约分组信号冲突发生，提高了系统的吞吐量。
A kind of modified packet reservation random access protocol for digital trunking systems is studied, which could reduce collisions among packet reservations and increase the system's throughout.
基于TETRA数字集群移动通信系统开发的TETRA终端，通过数据业务可以发送和接收状态消息和短数据业务消息，利用短数据业务完成终端导航定位功能。
Terminal based on TETRA digital trunking mobile communication system could send and receive status and short data service message, and achieve navigation and location through short data service.
ETSI发布的欧洲新一代全数字集群系统TETRA是当今最先进的移动通信系统之一。
The latest generation of the digital trunked system TETRA, which is defined by the European Telecommunications Standards Institute (ETSI), is one of the most advanced mobile communication systems.
伴随着TETRA数字集群技术的飞速发展，越来越多的专业用户开始使用TETRA制式的移动通信产品。
Following rapid development of TETRA digital trunking technology, dramatically increased professional users begin to utilize TETRA mobile communication products.
近年来，随着通信的飞速发展，作为专用移动通信系统的数字集群通信系统的研究也变得越来越重要了。
Recent years, with the rapid development of communication, the research of digital trunked radio communication system becomes more and more important.
近年来，随着通信的飞速发展，作为专用移动通信系统的数字集群通信系统的研究也变得越来越重要了。
Recent years, with the rapid development of communication, the research of digital trunked radio communication system becomes more and more important.
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