城市轨道交通车地通信综合承载系统(LTE-M)性能测试与分析

在城市轨道交通系统中,各子系统车地通信模块是完全独立的。独立建网造成城市轨道交通沿线缆线密集,结构复杂,对珍贵的频率资源也造成了极大的浪费。目前车地无线普遍采用基于IEEE 802.11的WLAN(无线局域网)技术,该技术存在频点干扰严重、高速性能瓶颈等重要缺陷。为了解决这些问题,将LTE(长期演进)应用到城市轨道交通的车地无线通信系统是很有必要的。设计了基于LTE的城市轨道交通车地通信综合承载系统(LTE-M),并在武汉地铁进行了LTE-M系统的性能测试。测试结果表明:LTEM系统具有系统稳定、综合承载能力强的特点,不仅能满足CBTC(基于通信的列车自动控制)系统传输要求,同时还具有为PIS(乘客信息系统)和CCTV(闭路电视监控)系统提供良好通道的能力。

Test and Analysis of Integrated Service Capacity for Train-ground Communication Based on Metro LTE-M System

Since the module of each communication subsystem is completely independent in urban rail transit system,the independent network building causes densely-laid cables along metro rail and complex structure,wasting a large amount of precious frequency resources.At present,the technology of WLAN based on IEEE802.11 is widely used in the field of train-ground wireless,which has some major defects like serious frequency interference,high performance bottleneck and so on.To solve these problems,the use of LTE (long term evolution) in urban rail transit wireless communication system is recommended,an integrated transport service capacity system (LTE-M) for urban rail transit LTE-based LTE is designed,and the performance of the LTE-M system is tested in Wuhan metro.The result shows that the LTE-M system is stable with good integrated service capacity,which can not only satisfy the transmission requirements of CBTC system,but also provide better channels for PIS (passenger information system) and CCTV.