TETRA数字集群基站同步技术的研究与实现

发布时间：2018-03-30 16:06

本文选题：TETRA数字集群系统　切入点：基站子系统　出处：《北京交通大学》2017年硕士论文

【摘要】：TETRA数字集群通信系统是基于时分多址方式的专业移动通信系统,主要应用于公安、安全、消防、军队、交通、政府等部门的指挥调度。TETRA数字集群基站负责无线资源管理,实现固定网络与移动用户之间的通信连接,传送信号和用户信息。当TETRA数字集群系统含有多个基站时,基站同步技术用于移动台进行小区搜索和越区切换。因此,TETRA数字集群基站同步技术是TETRA数字集群系统开发的关键技术之一。本论文在综述了国内外各种移动通信系统基站同步技术的基础上,首先分析和比较了各种移动通信系统的同步技术,根据TETRA数字集群系统的组成和基站子系统的工作过程,分析了 TETRA数字集群基站的同步功能,设计了基站同步误差的抑制方法,并对基站同步技术和同步方式进行分析和对比,选择最佳的基站同步技术和基站同步方式;然后,基于OPNET仿真软件,利用C语言,搭建了 TETRA数字集群系统的网络、进程、节点模型,设计了交换机(MSC)、交换设备以及基站控制器(BSC)的状态转移图,给出了各节点同步误差的仿真测量结果,分析了基站数量和基站间距离对基站同步性能的影响,确定基站同步方案;其次,基于Linux操作系统,利用C语言,开发了 MSC侧主时钟同步软件、BSC侧从时钟同步软件以及BTS与BSC之间不同授时模式同步软件,实现了基于1588协议的BSC与MSC间的同步和基于三模授时同步卡的BTS与BSC间的同步。最后,基于Windows操作系统,利用Xshell工具和Wireshark工具,通过TETRA数字集群协议分析仪捕获TETRA数字集群的空口数据,对基站同步进行了功能测试和精度测试,测试结果满足设计需求。
[Abstract]:TETRA digital trunking communication system is a professional mobile communication system based on time division multiple access (TDMA). It is mainly used in the command and dispatch of public security, security, fire fighting, military, traffic, government and other departments. TETRA digital trunked base station is responsible for wireless resource management. Realize the communication connection between fixed network and mobile user, transmit signal and user information. When TETRA digital trunking system contains multiple base stations, The technology of base station synchronization is used for cell search and handoff of mobile stations. Therefore, the synchronization technology of Tela digital trunked base station is one of the key technologies in the development of TETRA digital trunking system. This paper summarizes all kinds of mobile communications at home and abroad. Based on the synchronization technology of system base station, Firstly, the synchronization technology of various mobile communication systems is analyzed and compared. According to the composition of TETRA digital trunking system and the working process of base station subsystem, the synchronization function of TETRA digital trunked base station is analyzed. This paper designs a method to restrain the synchronization error of base station, analyzes and compares the synchronization technology and mode of base station, and selects the best synchronization technology and synchronization mode of base station. Then, based on the simulation software of OPNET, using C language, The network, process and node model of the TETRA digital trunking system are built. The state transition diagram of the switch, switching equipment and base station controller is designed, and the simulation measurement results of the synchronization errors of each node are given. The effect of base station number and distance between base stations on base station synchronization performance is analyzed, and the base station synchronization scheme is determined. Secondly, based on Linux operating system, C language is used. The slave clock synchronization software of MSC side and the synchronization software of different timing modes between BTS and BSC are developed. The synchronization between BSC and MSC based on 1588 protocol and between BTS and BSC based on three-mode timing synchronization card is realized. Finally, based on Windows operating system, Xshell and Wireshark tools are used. The empty data of TETRA digital trunking are captured by TETRA digital trunking protocol analyzer, and the function and precision of base station synchronization are tested. The test results meet the design requirements.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.52

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