TETRA作为最著名的数字集群通信系统之一，其高效性和安全性得到了越来越多的关注。
As one of the most famous kinds of digital trunked communication system, TETRA's efficiency and security have been cared more and more.
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.
随着数字时代的到来，原有的模拟集群的许多功能已经不能满足人们的需求，研制我们自己的数字集群系统是非常必要的。
As the digital times is coming, many function of the former analog trunked system can't satisfy the demand of people, it is necessary for us to research our own digital trunked system.
结合路径损耗模型给出了正常工作模式下的数字集群系统无线区域覆盖范围，并给出了不同的边缘通信概率的系统覆盖范围。
And the radio regional coverage scope with the path loss model under the normal work mode is discussed, then the different edge communication probability of coverage scope is determined.
本文简要介绍了网络管理技术，提出了一种基于简单网络管理协议的数字集群移动交换中心网络管理软件的设计与构架方案。
In this article, it introduces the network management technology and the design of Digital Trunking MSC network management Software that base on the SNMP protocol.
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.
TETRA协议是欧洲电信标准协会(etsi) 1998年公布的一种数字集群通信系统标准。
In 1998, ETSI publicized TETRA protocal, which is a standard of digital trunked radio communication system.
因此，开发具有自主知识产权的TETRA数字集群系统设备具有实际意义。
Therefore, it has practical significance to develop TETRA digital trunked system equipment which has independent intellectual property rights.
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.
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.
因此对TETRA数字集群系统安全技术的研究非常关键。
Therefore, we study the security of the TETRA system is very critical.
TETRA数字集群系统提供安全、可靠以及高效率的语音和数据通信，在全球许多国家得到了广泛的应用。
TETRA digital trunked systems provide secure, reliable and efficient voice and data communications, which are being widely used in many countries around the world.
数字集群系统TETRA提供空中接口加密和端-端加密以实现通信的机密性。
Air interface security and end-to-end encryption a re offered by TETRA to protect data during the entire transmission.
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.
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.
随着专业通信用户对通信网络的接续时间、可靠性以及安全性的要求不断提高，数字集群系统的系统复杂性也不断提高、业务功能不断增多。
With professional communication user constantly requiring more quickly setup a call, more reliability and more security, Trunking system complexity and business functions constantly increase.
介绍了数字集群系统在广州地铁二号线的应用情况，从系统构成、主要设备功能及优点等方面进行了介绍。
A digital trunked communication system is applied in Guangzhou Metro Line 2. The composition and merit points of the system and the functions of its principal equipment is introduced.
本课题即是军用数字集群通信系统的预研项目的一部分。
The task is a portion of the pre-reaserch project of the digital trunk system for military.
数字集群系统的参数设计和网络负荷对分组数据业务的延迟具有很大的影响。
In digital trunked system, the delay performance of packet data service is greatly affected by the design of system's parameters and the network load.
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.
本文以CDMA20001X终端技术为基础，对数字集群关键技术和协议进行分析和设计，对终端的集群实现进行了深入研究。
Based on the CDMA2000 1X terminal tetechnology, this paper analyzes and designs the key digital trunking technology and protocols, and make deep research on the terminal digital trunking tetechnology.
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.
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.
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