Design And Implementation Of DCS Engineering For Rail Traffic Control System Based On LTE

Urban rail transit has become increasingly important among various commuting tools.Its transportation capacity is 10 times that of public transportation vehicles,and its energy consumption is only one-half of public transportation.Its closed loop structure also guarantees its punctuality and speed..CBTC(Communication Based Train Control)is a new generation of urban rail transit signaling system,which ensures the rapid and reliable operation of urban rail transit.The DCS(Data Communication Subsystem)is responsible for the transmission of CBTC messagesBecause DCS based on WLAN has many problems,such as poor anti-interference,small AP coverage,slow handover and so on,the thesis studies the implementation method of DCS based on LTE.Based on the LTE-M(Long Term Evolution for Metro)specification,the thesis studies the DCS architecture based on LTE and the related technology of transmitting CBTC: in the application layer,the CBTC message format is analyzed;In the security layer,the anti-attack means and message encapsulation methods of CBTC messages are analyzed.In the wireless data link layer,the new retransmission mechanism of LTE is analyzed.According to the characteristics of LTE access network and core network,the design conception of heterogeneous interconnection CBTC is proposed.Finally,combined with the project case of DCS based on LTE in Nanjing S9 line,the problems of wireless coverage,anti-interference and high reliability in this project are described in detail,and the design idea,design process and test results of our solution are reported.The test results show that the new system can solve the problems of low channel capacity,long communication delay and easy data loss of WLAN rail transit control system when the train runs at high speed,which makes a beneficial attempt for the design of DCS based on LTE.