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Performance Improved Methods for Communication-Based Train Control Systems With Random Packet Drops
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DOI：10.1109/TITS.2013.2294719.png)
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Communication-based train control (CBTC) systems use wireless local area networks (WLANs) to transmit train status and control commands. Since WLANs are not originally designed for applications with high mobility, random transmission delays and packet drops are inevitable, which could result in unnecessary traction, brakes or even emergency brakes of trains, loss of line capacity, and passenger satisfaction. In this paper, we study the packet drops introduced by random transmission errors and handovers in CBTC systems, analyze the impact of random packet drops on the stability and performances of CBTC systems, and propose two novel schemes to improve the performances of CBTC systems. Unlike the existing works that only consider a single train and study the communication issues and train control issues separately, we model the system to control a group of trains as a networked control system (NCS) with packet drops in transmissions. Extensive field test and simulation results are presented. We show that our proposed schemes can provide less energy consumption, better riding comfortability, and higher line capacity compared with the existing scheme.
Keyword:
Communication-based train control (CBTC)
networked control system (NCS)
train control
wireless networks
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Stability robustness of networked control systems with respect to packet loss网络控制系统对丢包的稳定鲁棒性.png)
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