计算机工程

所属专题: 智能交通专题

• 智能交通专题 • 上一篇    下一篇

城市轨道交通CBTC系统与MiFi设备共存方案研究

刘晓娟a,徐昱a,张雁鹏b   

  1. (兰州交通大学 a.电子与信息工程学院; b.自动化与电气工程学院,兰州 730070)
  • 收稿日期:2014-12-17 出版日期:2015-11-15 发布日期:2015-11-13
  • 作者简介:刘晓娟(1964-),女,教授、博士,主研方向:城市轨道交通智能控制系统;徐昱(通讯作者),硕士研究生;张雁鹏,讲师、博士研究生。
  • 基金项目:
    甘肃省青年科技计划基金资助项目(1308RJYA057)。

Study on Coexistence Scheme for Urban Rail Transit CBTC System and MiFi Device

LIU Xiaojuan  a,XU Yu  a,ZHANG Yanpeng  b   

  1. (a.School of Electronic and Information Engineering; b.School of Automation & Electrical Engineering, Lanzhou Jiaotong University,Lanzhou 730070,China)
  • Received:2014-12-17 Online:2015-11-15 Published:2015-11-13

摘要: 便携式宽带无线路由器(MiFi)的普及对城市轨道交通列车运行的干扰日益加重,必须对基于通信的列车控制系统(CBTC)与MiFi设备进行共存抗干扰分析。为此,提出一种自适应区间化的分布式协调功能(DCF)改进方案,检测网络中的MiFi节点个数并进行区域划分,对 每个区域设置不同的竞争窗口值以改善系统性能。分析车厢内MiFi设备的分布模型和MiFi对CBTC车地通信的干扰模型,根据干扰的特点改进传统DCF方案,合理设置分区区间并预设竞争窗口。在不同帧长下计算改进前后DCF方案的吞吐量、传输时延和传输失败率等系统参数, 评估系统性能。分析结果表明,改进DCF优化方案可有效提高MiFi干扰下的CBTC车地通信性能,实现一定程度的两者共存。

关键词: 基于通信的列车控制系统, 便携式宽带无线路由器, 无线干扰, 分布式协调功能

Abstract: As the popularity of portable wireless broadband router MiFi equipment,the interference of urban rail transit train becomes more and more serious,therefore it is necessary to analyze coexistence anti-interference between Communication-based Train Control(CBTC) system and MiFi device.In order to improve the performance of system,this paper proposes an improved Distributed Coordination Function(DCF) scheme based on adaptive section,dividing MiFi node number into several sections and setting different contention window value.It firstly analyses the distribution model of inside carriage MiFi devices and interference model between MiFi and CBTC system.Secondly,it sets partition interval and contention window value according to the characteristics of interference.Finally,it uses the simulation tool to analyze throughput,transmission delay and transmission failure rate of CBTC system,in order to compare the different data frame length performance of traditional DCF scheme and modified DCF scheme.Analysis results show that the new DCF model optimization scheme can effectively improve the CBTC train-ground communication performance under MiFi interference environment,and it can achieve a certain degree of the coexistence.

Key words: Communication-based Train Control(CBTC) system, MiFi, wireless interference, Distributed Coordination Function(DCF)

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