基于LTE的城市轨道交通综合业务承载应用研究

Integrated Bearing Service Application Research Based on LTE in Rail Transit

通过对LTE(长期演进)应用原理的描述及LTE综合承载业务需求分析,介绍了采用基于LTE技术的1.8 GHz双网(15 MHz+1.4 MHz)城市轨道交通车地无线宽带网络,来综合承载CBTC(基于通信的列车控制)、乘客信息系统、闭路电视业务和列车状态监视业务的方案。针对方案中可能存在问题提出了一套测试方案,通过测试验证了方案的可行性。测试方案验证了主备TAU(车载接入单元)能够通过车载乘客信息系统二层网络实现主备切换,且列车头尾TAU的VRRP(虚拟路由冗余协议)心跳数据不影响车载二层网络业务,通信TAU头尾切换时的业务数据对信号TAU的CBTC业务没有影响;验证了LTE综合承载网方案的可行性,为后续项目实施提供了可靠依据。

With a description of LTE application principle and an analysis of the demands for LTE comprehensive bearer service,the metro train/ground wireless broadband network based on LTE technology is described,which adopts 1.8 GHz dual network（15 MHz ＋ 1.4 MHz）,and carries comprehensively the CBTC/PIS/CCTV service and train status monitoring service schemes. In view of the possible problems in the system,a set of testing schemes is proposed,the feasibility of the scheme is verified through testing. In which,the TAU（train attached unit） can realize hot standby switching through the onboard PIS 2-layer network,while the VRRP（virtual router redundancy protocol） heartbeat data of TAU on both ends of a train does not affect the on-board 2-layer network service,and the traffic data of TAU during head-to-tail handover has no effect on CBTC service of signal TAU either. The feasibility of the LTE integrated bearer network scheme is verified,providing a reliable basis for the implementation of subsequent projects.