Study on Model for Analysis of CBTC Data Communication System(DCS) and Its Application
Fei Yan · Journal of the China Railway Society · 2011
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.