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With the development of metro, the grade of automation(GoA) of metro operation system has been greatly updated. The information between onboard train control and management system(TCMS) and track side maintenance system has become more complex, and the integration of control and communication networks has become a consensus target in metro industry. The control information of traditional train control and management is based on multi-function vehicle bus(MVB) without wireless network, and the security of information transmission can be neglected. In the system of control and communication network integration, the security of information transmission has become a key element. This paper proposes a wireless network maintenance information transmission protocol for metro TCMS based on RSSP-I with advanced encryption standard(AES), which can defense the 7 threads of metro TCMS suitable for GoA4 vehicles.
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