基于GPRS分组交换网络的CTCS-3级列控系统车地安全数据传输的可行性  

Feasibility of Train-Ground Safety Data Transmission for CTCS-3 Train Control System Based on GPRS Packet Switching Network

作　　者：丁建文[1,2] 宋甲英[3] 林思雨[1] 曹源[1] 钟章队[4] 

机构地区：[1]北京交通大学电子信息工程学院,北京100044 [2]北京交通大学国家轨道交通安全评估研究中心,北京100044 [3]中国电子学会,北京100036 [4]北京交通大学计算机与信息技术学院,北京100044

出　　处：《中国铁道科学》2015年第3期119-126,共8页China Railway Science

基　　金：国家自然科学基金-铁道基金联合资助项目(U1334202);铁道部科技研究开发计划项目(2013X002-A);教育部科学技术研究重大项目(313006)

摘　　要：基于高速铁路既有的通用分组无线业务(GPRS)分组交换网络以及CTCS-3级列控系统车地安全数据传输需求,提出GPRS承载CTCS-3级列控系统车地安全数据传输业务的服务质量(QoS)关键指标和协议栈;基于半实物仿真平台提出GPRS网络承载车地安全数据传输QoS测试方法,并对QoS关键指标进行测量和分析。结果表明:40字节和128字节用户数据报协议(UDP)数据帧端到端传输时延在改进网络临时块流(TBF)释放机制后,可以满足车地安全数据传输QoS的需求;GPRS网络的误帧/丢帧主要出现在小区重选时,下行链路误帧/丢帧率高于上行链路误帧/丢帧率;GPRS附着时延和分组数据协议(PDP)激活时延可以满足车地安全数据传输QoS的需求。优化GPRS网络数据传输时延、小区重选机制和重选时的数据缓存机制是利用GPRS网络承载CTCS-3级列控系统车地安全数据传输的关键。The Quality of Service（QoS）key metrics and protocol stacks of General Packet Radio Service（GPRS）based CTCS-3train control safety data transmission are proposed according to the feature of the existing GPRS packet switching network and CTCS-3train control safety data transmission service.Then the QoS measurement methodology of hard-in-the-loop simulation test bench for GPRS based safety data transmission is designed and the QoS key metrics are measured based on it.The measurement results show that the end-to-end transfer delay of User Datagram Protocol（UDP）frame of 40 bytes and 128 bytes can meet the QoS requirements after improving GPRS Temporary Block Flow（TBF）release mechanism;the error frame/lost frame always appears during the cell reselection and the error frame/lost frame rate of downlink is higher than that of uplink;the delay of GPRS attachment and Packet Data Protocol（PDP）context activation can meet the QoS requirements.Optimizing the data transfer delay,cell reselection scheme and data buffering mechanism of cell reselection of GPRS network are the key issues to make the GPRS bearing the train control safety data transmission service possible.

关 键 词：通用分组无线业务 CTCS-3级列车控制系统 安全数据传输 宽带移动通信 服务质量 

分 类 号：U285.21[交通运输工程—交通信息工程及控制] TN929.5[交通运输工程—道路与铁道工程]