基于随机Petri网的GSM-R越区切换成功率分析

CTCS-3级列车运行控制系统利用GSM-R网络进行车地间连续、双向的安全信息传输。而GSM-R系统采用硬切换技术,切换时必然会产生短暂的通信中断,这就会影响列车控制类数据传输业务。为保证安全数据传输的可靠性,迫切要求更短的切换时间和更高的切换成功率。对此,建立GSM-R系统越区切换的随机Petri网模型,分析影响越区切换成功率的因素,并利用MATLAB仿真得到列车运行速度、越区切换中断时间以及列车追踪间隔与越区切换成功率的关系;最后说明列车在350 km/h和430 km/h速度下运行时,越区切换成功率是否满足CTCS-3级系统需求标准要求。

Analysis of GSM-R Handover Switching Success Rate Based on Stochastic Petri Net

CTCS( China Train Control System) level-3 uses GSM-R networks to conduct continuous twoway security information transmission between train and ground. However,GSM-R system adopts hardswitching technology,which will produce a short time communication interrupt and affect train control data transmission. In order to ensure the reliability of security data transmission,shorter time and higher success rate of switching is urgently required. Therefore,this paper establishes a stochastic Petri net model of GSM-R system switching and analyzes the factors that impact the success rate of crossover switching. The relationships between and among the train speed,crossover switching interruption time,and train tracking interval and crossover switching success rate are obtained with MATLAB simulation.Finally,the paper illustrates whether the crossover switching success rate meets the system requirements of CTCS-3 when the train runs at the speeds of 350 km / h and 430 km / h.