With the rapid growth of capacity demand of railways around the world, Communication Based Train Control (CBTC) system, which is usually used in moving block signaling system to shorten the headway, is adopted by more and more countries. The railway operator in Beijing, the Beijing Subway, is no exception. In order to improve the train operation to meet the capacity demand, the Beijing Subway is interested in understanding how the communication delay of the train-ground wireless communication system affects the headway. Appropriate evaluation methods are needed for this purpose. Therefore, in this paper, we firstly analyzed the impact of the wireless communication delay on train safety envelope. Then, the constraint relationship between the communication delay and the train speed is deduced according to the wireless communication theory and the IEEE 802.11 protocol, Rayleigh distribution is introduced to the relationship to describe the stochastic characteristics of communication delay. In addition, based on moving block headway calculation method, an analytical model combining the headway evaluation and the communication delay is derived subject to the train safety envelope. Simulation results show the difference of the headway between ideal situation and communication delay situation and the relationship between the headway and the train maximum speed under the condition of different communication delays, the conclusions can be used for the train headway optimization, the train safety operation and the transportation efficiency improvement in the similar environments.


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    Title :

    Impact of wireless communication delay on train headway of Communication Based Train Control system


    Contributors:
    Wei Li, (author) / Tao Tang, (author) / Di Liang, (author)


    Publication date :

    2016-11-01


    Size :

    373494 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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