下一代高速铁路LTE-R时间同步网协议脆弱性分析

Vulnerability Analysis of Next-generation High-speed Railway LTE-R Time Synchronization Network Protocol

铁路无线通信系统时间同步网络,是保障行车安全和提高铁路运营效率的重要基础。针对下一代高速铁路LTE-R自身全IP化架构在使用精确时钟PTP时间同步协议过程中易受到ARP攻击的问题,提出基于随机Petri网(SPN)的LTE-R时间同步网协议脆弱性分析方法。建立了ARP攻击状态下LTE-R时间同步网协议脆弱性分析SPN模型;通过马尔科夫链同构的方法,得到ARP攻击下LTE-R三级时钟节点实施速率与PTP协议同步正常、异常之间的关系曲线;定量得到了影响LTE-R时间同步网协议脆弱性的关键因素。研究结果为GSM-R时间同步网络向LTE-R安全演进提供了一定的理论参考依据。

The time synchronization network of the railway wireless communication system is an important foundation to ensure the safety of trains and improving the efficiency of railway operations.In response to the problem that the all-IP architecture of the next-generation high-speed railway LTE-R is vulnerable to ARP attacks when using the PTP time synchronization protocol,this paper proposed a vulnerability analysis method for the LTE-R time synchronization network protocol based on stochastic Petri net(SPN).The SPN model of LTE-R time synchronization network protocol vulnerability analysis under ARP attack was established.Through the method of Markov chain isomorphism,the relationship curve between the implementation rate of the LTE-R three-level clock node and normal and abnormal PTP protocol synchronization under ARP attack was obtained.The key factors affecting the vulnerability of the LTE-R time synchronization network protocol were quantitatively obtained.The research results offer a certain theoretical reference for the safe evolution of the GSM-R time synchronization network to LTE-R network.