论文部分内容阅读
利用随机Petri网模型,综合随机信道恶化、越区切换、无线接入设备故障等无线信道失效因素,建立列车控制系统中数据通信子系统非冗余结构和冗余结构的帧丢失概率模型,给出分解的无线数据通信模型的定点迭代求解方程。分别计算:冗余结构、非冗余结构的数据通信系统的帧丢失概率;不同列车数量、不同列车运行速度对应的帧丢失概率。分析计算结果表明:冗余结构数据通信系统的帧丢失概率远低于非冗余结构的;主要原因是冗余结构数据通信系统不因单一AP通信中断而失效、有效消除了列车越区切换对帧丢失概率的影响。
Based on the stochastic Petri nets model and the wireless channel failure factors such as stochastic channel deterioration, handoff and wireless access equipment failure, the frame loss probability model of non-redundant structure and redundant structure of data communication subsystem in train control system is established. Fixed point iterative solution of the decomposed wireless data communication model. Calculate the frame loss probability of the data communication system with redundant structure and non-redundant structure respectively; and the probability of frame loss corresponding to different train numbers and different train running speeds. The analysis and calculation results show that the frame loss probability of the redundant structure data communication system is much lower than that of the non-redundant structure. The main reason is that the redundant structure data communication system does not fail due to single AP communication interruption, effectively eliminating the train handoff pair Effect of frame loss probability.