On the technical requirements for communications-based train control system (CBTC), CBTC system in urban transit data communications subsystem (DCS) network structure and function are studied, focusing on analysis of the way side backbone network technology program, and wireless roaming switching working principle and network redundancy, and three kinds of wireless coverage are compared.%针对基于通信的列车控制系统(CBTC)的技术需求,对城市轨道交通CBTC系统中数据通信子系统(DCS)的网络结构与功能进行研究,重点分析了轨旁骨干网技术方案、无线漫游切换机制和网络冗余,并对3种不同无线覆盖方式进行了比较。
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