高铁动车组WiFi运营服务系统服务质量的测量与分析

摘要

高铁作为高速、远距离出行的重要公共交通工具,具有载客量大、旅客密度较高等特点.由于近年来诸如手提电脑、智能手机、智能手表等移动设备的普及,乘客们在高铁上使用移动设备作为休闲、娱乐方式的时间逐渐增加,对高铁移动网络的使用需求日渐增长.然而,“复兴号”的运行速度高达350 km/h,为无线通信带来了巨大的挑战.铁路动车组WiFi运营服务系统运用先进的现代化信息技术,为列车上的旅客提供车内的局域网服务以及互联网接入服务.对实际网络数据的分析表明:大部分TCP会话的规模较小,传输速率较低,并且持续时间较短.通过联合使用不同运营商的蜂窝网络服务,高铁WiFi系统保证了铁路动车组WiFi服务能够为乘客提供吞吐量稳定且服务优良的网络环境.%As a high speed and long running distance important public transport vehicle,high-speed rail has the properties of large passenger capacity,high passenger density and high running frequency.Since mobile devices such as laptops,smart phones,and smart watches are more and more popular these years,passengers use mobile devices as rest and entertainment method more and more frequently.Thus,the demand of wireless networking using in high-speed rail is growing fast.But the high mobility caused by the 350 km/h velocity of high-speed rail brings huge problem and challenge.The high-speed rail WiFi service system uses modern information technology and provides local area network service in carriage and access of the Internet for the passengers.Analysis of real trace that passengers access the Internet in high-speed rail shows that most flows are small,low rate and has short duration time.By using cellular service from different operators,the high-speed rail WiFi system can provide passengers acceptable throughput and stable wireless network environment.