This paper focus on the interleaving double-network structure adopted by the GSM-R network in CTCS-3 system at present, and proposes a new network transmission redundancy structure. Based on Markov Chains, the factors which may lead to communication failures in the process of GSM-R network communication are comprehensively considered, such as the transmission errors, transmission interference, connection loss, handover and so on, while the influence of train's speed on the reliability and availability are analyzed. Afterwards the two models of the reliability and availability of the network structure are proposed. Through simulation analysis on the new network structure, it is concluded that; the new network structure can improve the sojourn time of the system under working state, with a better reliability and a better availability than that of traditional network structure, also the influence on it caused by the train's speed is smaller.%针对当前CTCS-3系统中GSM-R网络采用的交织双网结构,提出了一个新的网络传输冗余结构.利用马尔可夫链,综合考虑了GSM-R网络通信过程中可能导致通信失败的一些因素:传输错误、传输干扰、连接的丢失、越区切换等,以及列车速度对系统可靠性与有效性的影响,提出2种网络结构的可靠性与有效性模型.通过对新网络结构的仿真分析,采用新网络结构使得系统在工作状态下的逗留时间有了很大的提高,可靠性和有效性均优于传统的网络结构,并且受到列车速度的影响也更小.
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