CBTC数据通信系统性能分析模型及应用研究

Study on Model for Analysis of CBTC Data Communication System(DCS) and Its Application

数据通信系统DCS(Data Communication System)是影响CBTC系统的控制精度、效率和安全性的主要因素,其通信性能的仿真、验证对于CBTC系统的研发和改进有重要意义。本文介绍利用OPNET模拟自主研发的安全通信协议和构建DCS性能仿真研究平台的方法,给出安全通信协议有限状态机模型和可配置的通信子系统节点通用模型,研究平台可用于分析安全协议在整个通信网络上的总体性能。给出利用节点模型建立整个DCS通信网络的算例和网络性能的仿真结果,实验结果表明,通信周期不完全同步可以减小报文时延,网络出现故障后,改变生成树根节点位置使最大报文时延增加近34%。

DCS is the major factor affecting the control-proficiency, transportation ability and safety of the CBTC system. So, verification of the qualities of DCS with simulation methods is of great significance to development and improvement of the CBTC system. The technique of modeling the security communication protocol developed by ourselves and the setup of a research platform for analyzing the performance of DCS using OPNET are introduced. The Finite State Machine （FSM） of the security communication protocol and the Configurable Generic Node Model （CGNM） of communication subsystems are proposed. The platform is used for studying the overall performance of the network with this security communication protocol. The examples of using the node model to construct the DCS network as well as the network performance simulation results are also introduced. Experimental results indicate that the imperfect synchronization of communication cycles can decrease the packet delay, and the maximum delay raises by about 34% when changing the root node of the spanning tree upon occurring of network faults.