Next Generation Train-Centric Communication-Based Train Control System with Train-to-Train (T2T) Communications

High-reliability and low-latency are crucial for urban rail transits. In this paper, we introduce communication strategies for urban rail transit systems using Long Term Evolution for Train-to-Train (LTE-T2T) communication. The transmission latency is set as a system metric to evaluate the performance of urban rail transit system. First, a novel train-centric Communication- Based Train Control (CBTC) model is established using LTE- T2T communications. Then, we introduce a novel sensing-based semi-persistent scheduling method for resource allocation in this proposed system. Based on the introduced method, extensive field test and simulation are executed. The related results show that the transmission latency of safety-critical information in urban rail transit system can be improved using the introduced scheme.