Abstract
Communication-Based Train Control (CBTC) system is a critical signal system to ensure rail transit’s safe operation. Compared with the train-ground CBTC system, the train control system based on train-to-train (T2T) communication has the advantages of fast response speed, simple structure, and low operating cost. As the core part of the train control system based on T2T communication, the reliability of the data communication system (DCS) is of great significance to ensure the train’s safe and efficient operation. According to the T2T communication system requirements, this paper adopts Long-Term Evolution-Unlicensed (LTE-U) technology to design the DCS structure and establishes the reliability model of the communication system based on Deterministic and Stochastic Petri Nets (DSPN). Based on testing the real line’s communication performance parameters, the DSPN model is simulated and solved by π -tool, and the reliability index of the system is obtained. The research results show that the LTE-U-based T2T communication system designed in this paper meets the train control system’s needs for communication transmission. This paper’s reliability evaluation method can complete the reliability modeling of train control DCS based on T2T communication. The research in this paper will provide a strong practical and theoretical basis for the design and optimization of train control DCS based on T2T communication.
Highlights
IntroductionThe Communication-Based Train Control (CBTC) system has been widely used in urban rail transit systems [1]. The existing CBTC system is technically very mature
Today, the Communication-Based Train Control (CBTC) system has been widely used in urban rail transit systems [1]
There are still certain shortcomings: the system structure is involved, which leads to too many interfaces between subsystems; the information transmission process is cumbersome, and the on-board equipment cannot directly obtain relevant information, which limits the increase in train speed; the system consists of more equipment, resulting in higher system construction and operating costs, which is not conducive to the large-scale development of urban rail transit [2]
Summary
The CBTC system has been widely used in urban rail transit systems [1]. The existing CBTC system is technically very mature. The wireless communication technology used in the DCS has a more significant impact on the data transmission process between train control subsystems related to the quality of communication. Bai researched the application of LTE-U in the urban rail transit vehicleground communication system, and its wireless resource scheduling management and mobility management algorithms [9]. The research on the LTE-U DCS of urban rail transit is in its infancy, so it is of considerable significance to study the design and reliability of train DCS based on LTE-U. The existing model parameters in the reliability research of the DCS are almost all hypothetical, and the system performance parameters are not obtained from the real train control DCS.
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