Failure Case Analysis and Countermeasures of CBTC System of Shanghai Rail Transit Line 9

The investigation information of CBTC (communication-based train control) communication loss issue for Shanghai Rail Transit Line 9 is introduced. By comprehensively adopting train-wayside wireless communication principle and the field electromagnetic environment monitoring result, it is analyzed that the root cause of the failure occurrence is external signal interference. From the perspective of equipment renewal and management support, countermeasures are put forward, such as accelerating the comprehensive wireless bearing construction in 1.8 GHz band, enhancing the antiinterference ability of existing wireless equipment along the line, perfecting the radio management mechanism, improving the electromagnetic environment monitoring ability, and strengthening the interaction with external units and functional departments.