Delay Bound Analysis of Wireless Train Control and Monitoring System Using Stochastic Network Calculus

Wireless train control and monitoring system (WTCMS) introduces wireless communication technology on the basis of traditional TCMS, which is responsible for monitoring the operation status of train equipment in high-speed trains. The delay of WTCMS has great influence on the operation safety of high-speed trains. In order to ensure the requirement of information transmission in real time, we analyze the stochastic delay bound of WTCMS using stochastic network calculus (SNC). For stochastic arrival curve of WTCMS, periodic traffic model and Poisson traffic model are used to describe process data and message data of WTCMS, respectively. The impairment process model and Markov on-off model are used to denote the stochastic service curve of the wireless channel. And we represent the service curve of wired transmission network by combining the Latency-Rate model and the service priority model. Based on the moment generating function (MGF) method in SNC, the upper delay bounds of WTCMS are derived according to stochastic arrival curve and service curve. The theoretical analysis is validated by simulations, which shows that the delay performance of WTCMS meet the delay requirements.