基于通信的列车控制系统越区切换算法研究

Handoff Algorithm Based on CBTC Systems in Urban Mass Transit

无线局域网是城市轨道交通CBTC(基于通信的列车控制)系统车地通信的主要方式之一。在考虑轨旁接入点冗余的基础上,提出一种频率组合切换算法,将检测到的频率数目作为列车越区切换的判断依据,利用邻居图使切换时延满足列车服务质量的要求。与传统切换算法相比,该算法实现简单、切换时延小,能够确保车地通信网络可靠快速切换。

Wireless LAN is one of the main train-to-wayside communication ways of CBTC system in urban mass transit.Considering the trackside access point redundance,the handoff algorithm with frequency combination is proposed,in which the condition of handoff judgment is the detected frequency number.The neighbor graph is used to meet the requirements of train service in case of handoff delay.Compared with the traditional algorithm,this new one is simple with low latency,it can ensure a fast and reliable swithing in train-to-wayside communication networks.