Reliability Optimization of End-to-End Access Process of Railway Mission Critical Video Service

Mission Critical Video (MCVideo) service has been introduced into the Long Term Evolution for Railway (LTE-R) system to realize railway video trunking communication. According to the test results, the reliability of the existing end-to-end access process of MCVideo cannot satisfy the requirements of the railway video trunking communications. In this paper, the reliability of end-to-end access process of the MCVideo is investigated. The end-to-end access process system is modeled with Deterministic and Stochastic Petri nets (DSPNs), and then the probability of successful access is analyzed based on DSPN model. With the analysis results, the dual-module communications and retransmission strategies are proposed to optimize reliability of MCVideo service. Extensive simulation results are conducted to verify the reliability of the end-to-end access process with dual-module communications and retransmission, and it is shown that the probability of successful access can achieve the QoS requirements of LTE-R.