轨道交通车地通信LTE特殊场景覆盖分析与解决方案

Special Scenario Coverage Analysis and Solutions to LTE Train-Ground Communications of Rail Transit

在国内轨道交通快速发展下,城市轨道交通线路正在向网络化发展。轨道交通的线路、车站、车辆段、隧道区间等建设情况日趋复杂,使基于TD-LTE技术的车地通信系统的设计、建设和维护难度越来越大。在规划设计和建设中应保证车地业务的安全、可靠,减少信号干扰,应用新的技术满足轨道交通不断增长的需求。基于郑州市轨道交通车地无线LTE综合承载方案,结合前期建设、运营的经验,针对轨道交通线网中多种复杂场景的应用分析,结合1.8 G频率资源优化配置,提出特殊场景下车地通信LTE覆盖解决方案,并对不同场景下空间隔离、频率隔离、共基站覆盖等方案进行对比分析,为实际工程建设提供有效的理论依据与工程实施方法。

Urban rail transit operations in China have changed from single line to multiline networks and its operation information is exchanged through communications networks. The construction of lines, stations, depots and tunnels for urban rail transit has become more and more complicated, which gives rise to difficulties in designing, building and maintaining Time-division Long-term Evolution（TD-LTE） train-ground communications systems. Therefore, new technology is required to improve safety and liability and to reduce signal interference in the planning and building of the train-ground communications systems. This paper analyzed the overall service capacity and the design and operation experiences of the LTE wireless train-ground communications system as an example. It expounds the coverage of the system under complicated scenarios in urban rail transit line networks. Optimal configuration of 1.8 G frequency resources is presented and the solutions to special scenario LTE communications coverage are proposed. The schemes of spatial isolation, frequency isolation and co-site coverage are compared and analyzed in a bid to provide theoretical basis and engineering methods for engineering practice.