相对于传统的基于通信的列车运行控制系统(communication based train control，CBTC)，下一代列控系统将具有架构可靠、速率快、成本低以及服务质量高等优点，且数据通信系统的可用性能够保障列车的安全和高效运行。面向下一代列控系统，首先设计基于LTE-M(long term evolution-metro，LTE-M)的通信系统结构；然后针对下一代列控系统典型场景，利用确定与随机Petri网(deterministic and stochastic petri nets，DSPN)进行可用性建模，最后进行模型求解和可用性评估。仿真结果显示，基于LTE-M的下一代列控数据通信系统能够满足实际通信需求，其可用性分析方法可以完成数据通信系统的可用性建模与评估。

Compared with traditional communication-based train control (CBTC), next-generation train control systems have the advantages of reliable architecture, fast speed, low cost, and high quality of service. Availability can guarantee the safe and efficient operation of trains. This study focused on the next-generation train control system. First, the structure of the communication system based on LTE-M is designed. Second, for the typical scenarios of the next-generation train control system, deterministic and stochastic Petri nets were used for availability modeling, and then the π-Tool was used for model solution and availability evaluation. The simulation results showws that the next-generation train control data communication system based on the LTE-M proposed in this paper can meet the actual communication needs, and its availability analysis method can complete the availability modeling and evaluation of the data communication system.

U285.21