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.
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.
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.
在电信中心办公室和交换中心安装工机电，模拟和数字集群系统，电路和设备。
Install electromechanical, analog and digital trunking systems, circuits and equipment in telecommunications central offices and switching centres.
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.
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.
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.
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.
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.
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.
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.
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