基于LTE技术的车地通信系统综合业务承载能力测试研究

无线局域网(WLAN)在地铁中的使用存在频点干扰严重、列车高速移动时带宽不稳定、越区切换频繁等问题,已不能满足当前城市轨道交通信息传输日益增长的需求,为此设计基于长期演进(LTE)技术的城市轨道交通车地无线通信系统解决方案。通过在20MHz带宽下对该系统综合业务承载能力的测试研究表明:A网在5MHz带宽下可同时承载6路基于通信的列车运行控制(CBTC)业务;B网在15MHz带宽下可同时承载6路CBTC及其他多项业务。测试过程中各项指标符合要求,系统性能稳定,完全具备城市轨道交通系统多业务承载能力,对城市轨道交通车地通信系统工程的建设具有参考价值。

Research on comprehensive service carrying capacity test of train borne-trackside communication system based on LTE technology

WLAN(Wireless Local Area Network)in the use of metro has some problems,such as serious frequency interference,unstable bandwidth when the train is running at high speed,frequent handoff and so on,which cannot meet the increasing demand of the current urban rail transit information transmission.Therefore,a solution of urban rail transit train borne-trackside wireless communication system based on LTE(Long Term Evolution)technology is designed.Through the test and research on the comprehensive service carrying capacity of the system under the bandwidth of 20 MHz,it shows that network A carries 6-way CBTC(communication-based train operation control)services at 5 MHz,and network B carries 6-way CBTC and multiple services at 15 MHz.In the test process,all the data meet the requirements,the system performance is stable,and it has the capacity of multi-service carrying capacity of rail transit system,featuring with the reference values for future construction of urban rail transit train borne-trackside communication system engineering works.