京沪高铁沿线LTE网络切换性能分析  

Handover Performance Analysis of the LTE on Beijing-Shanghai High-speed Railway

作　　者：董兴芝 李平 孙华龙 王忠峰 DONG Xingzhi;LI Ping;SUN Hualong;WANG Zhongfeng(Institute of Computing Technologies,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;China Railway Gecent Technology Co.,Ltd.,Beijing 100097,China)

机构地区：[1]中国铁道科学研究院集团有限公司电子计算技术研究所,北京100081 [2]国铁吉讯科技有限公司,北京100097

出　　处：《铁道标准设计》2022年第10期162-165,190,共5页Railway Standard Design

基　　金：中国国家铁路集团有限公司科研开发计划课题(P2021G011)。

摘　　要：为进一步分析高铁沿线网络切换性能,提升高速移动场景下列车网络服务质量,以京沪高铁网络环境为研究对象,深入研究京沪高铁沿线LTE网络切换性能关键影响因素。基于时速350km的高速列车,利用车载Wi-Fi中心服务器通信模组,通过内置三大运营商SIM卡各一张,使用ltedatatofile程序抓取LTE网络参数信息,通过tcpdump保存TCP抓包记录,对京沪高铁沿线吞吐量、基站密度、基站切换成功率等网络切换指标进行统计分析。经实测数据分析,铁路沿线网络切换过程中同一位置信号具有可重复性,信号连接中断具有可重复性。该测试数据分析结果有利于京沪高铁沿线网络优化补强,同时可为后续高速铁路沿线5G网络建设优化提供一定参考。In order to further analyze the performance of network handover along the high-speed railway,and improve the quality of train network service under high-speed mobile scenario,this paper takes the network environment along the Beijing-Shanghai High-speed Railway as research object to study the handover performance of the LTE correlation index parameters.The throughput capacity,density of the base station and handover success rate along the Beijing-Shanghai High-speed Railway are calculated and analyzed based on 350 km/h high-speed trains by using the railway EMU Wi-Fi center server communication module that contains 3 SIM cards,the ltedatatofile program to grab the LTE network parameter information and the tcpdump to save TCP grab records.The analysis of the real vehicle test data shows that the signal in the same position and the signal connection interruption are repeatable during the network switching process along the railway.The results of data analysis are conducive to the network optimization and reinforcement along the Beijing-Shanghai High-speed Railway and can provide references for the optimization of 5 G network construction along the high-speed railway.

关 键 词：高速铁路 车地通信 LTE TCP 网络切换 

分 类 号：U285[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]