摘要： LTE-R无线通信系统可为铁路通信网络提供数据传输支持，实现列车安全可靠运行，然而目前针对该系统的可靠性与失效动态特性分析较少。提出一种基于动态故障树（DFT）的LTE-R系统可靠性分析方法。通过分析网络结构和服务质量指标对列车行车的影响，给出LTE-R可靠性特征量定义，从而建立DFT分析模型，并采用Markov方法和二元决策图（BDD）方法分别计算单网、双网和射频拉远单元3种交织冗余结构的可靠性指标。分析结果表明，双网交织冗余结构可靠性最高，稳态有效度达到99.999 86%，单网交织冗余结构可靠性最低，稳态有效度为99.993 69%。

关键词: LTE-R通信系统, 可靠性, 动态故障树, 冗余网络, 二元决策图

Abstract: LTE-R wireless communication system can provide data transmission support for railway communication network and realize the stable operation of the train,but at present there is little analysis done on its reliability and failure dynamic characteristics.In view of this situation,this paper proposes a reliability analysis method of LTE-R system based on Dynamic Fault Tree(DFT).By analyzing the influence of network structure and Quality of Service(QoS) indexes on train operation,the definition of LTE-R reliability characteristic quantities are given,and the DFT analysis models are established.The reliability indexes of the three interweaved redundant structures,including of single network,dual network and Radio Remote Unit(RRU) are calculated by Markov method and Binary Decision Diagram(BDD) method respectively.Analysis results show that the reliability of dual network interleaved redundant structure is the highest,the steady-state effectiveness reaches 99.999 86%,and that of single network interleaved redundant structure is the lowest,the steady-state effectiveness is 99.993 69%.

Key words: LTE-R communication system, reliability, Dynamic Fault Tree(DFT), redundant network, Binary Decision Diagram(BDD)

中图分类号: 

• TN918.91