An Optimized Link Layer Design for Communication-Based Train Control Systems Using WLAN
An Optimized Link Layer Design for Communication-Based Train Control Systems Using WLAN
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DOI：
10.1109/access.2017.2763173
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发表时间：
2018
期刊：
影响因子：
3.9
通讯作者：
Qisheng Dong;Kazunori Hayashi;Megumi Kaneko
中科院分区：
文献类型：
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作者：
Qisheng Dong;Kazunori Hayashi;Megumi Kaneko
随着机器对机器和车辆对一切通信系统的出现，下一代列车控制系统，即基于通信的列车控制（CBTC）系统也引起了学术界和工业界越来越多的兴趣。与基于轨道电路的传统列车控制系统不同，CBTC系统有望提供更大的运输能力，同时通过利用列车和路旁接入点之间的无线通信确保安全。然而，由于无线信道的特性，ap与列车之间的数据包传输延迟会极大地影响列车控制的性能。以往的研究大多采用自适应调制和编码（AMC）方法，通过最小化平均延迟来提高控制性能，同时考虑到信道衰落引起的传输误差。然而，由于多个竞争列车导致的介质访问控制（MAC）层争用，可能导致延迟和控制性能的显著下降，尚未得到考虑。因此，我们提出了一种优化的链路层AMC方法，用于使用无线局域网的CBTC系统，该方法包含衰落信道和MAC层争用的影响。由于所需信息大大减少，所提出的方案能够选择在每个控制周期内使平均延迟最小化的传输模式。仿真结果表明，在较宽的参数和设置范围内，该方法大大优于传统方案。
With the advent of machine-to-machine and vehicular-to-everything communication systems, next-generation train control systems known as communication-based train control (CBTC) systems are also gathering increased interests both from academia and industry. Unlike the traditional train control systems based on track circuits, CBTC systems are expected to provide greater transportation capacity while ensuring safety by exploiting wireless communications between trains and wayside access points. However, due to the nature of wireless channels, packet transmission delays between APs and trains can greatly affect the train control performance. Most previous works have adopted an adaptive modulation and coding (AMC) method that minimizes the average delay to improve the control performance taking care of transmission errors due to channel fading. However, medium access control (MAC) layer contention due to multiple competing trains, which can entail significant degradations of the delay and control performance, has not been considered. Therefore, we propose an optimized link layer AMC method for CBTC systems using wireless local area network that encompasses the impacts of fading channels as well as of MAC layer contention. With much reduced required information, the proposed scheme enables to select the transmission mode that minimizes this average delay in each control period. The simulation results show that the proposed method greatly outperforms the conventional schemes over a wide range of parameters and settings.