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超高速无线通信技术助力“智慧高铁”

2017-08-07 15:06:40   中国经济网

中国经济网8月7日讯(记者许红洲)日前,超高速无线通信(EUHT)技术在京津城际高铁上成功演示。在时速高达300公里的高铁上,该技术不仅可以承载高铁旅客全程WIFI高速上网,还可以将车厢内和铁路沿线高清视频实时传输,画面清晰流畅稳定。

此次演示,技术方在亦庄到永乐间京津高铁沿线及天津站机房共设置了12个摄像头。在高铁上,打开电脑接入信号,从天津站机房传送来的钟表实时视频中,秒针运行十分流畅。

“用最通俗的话说,EUHT技术就如同是给高铁连接了一根超宽带的光纤,通过车地的空中传输,实现超宽带无线通信。”负责该项目系统集成的广东新岸线公司总工程师邸士萍告诉记者。

随着我国高铁线路网络的不断扩展,人们的出行变得越来越便利。然而,高铁上手机信号不好、上网体验差一直为社会关注。

高速移动下的无线通信,是全球面临的难题。十多年前,在我国高铁起步阶段,借鉴运用了欧洲高铁使用的GSM-R无线通信技术,也就是手机诺基亚时代的2G技术,这项技术经过铁路研究部门反复修改、贴补丁改进后,较为满足了当时我国高铁的需求。但是根据民用需求研发的技术,应用于高铁后,可靠性低,经常掉线;数据传输慢,大量车地数据无法传输等问题突出。为此,铁路研究部门一直在寻找新的高铁无线通信技术。

京津城际高铁全长120公里,是我国第一条运行时速达350公里的高速铁路。2015年开始,广东省政府和中国铁路总公司高层连续两年共同研究EUHT技术合作,旨在共同突破高铁无线通信核心技术。2016年5月,双方确定在京津城际高铁建设EUHT网络工程,开展产业级测试和应用。

京津城际高铁超高速无线通信(EUHT)网络工程由中铁工程设计咨询集团设计,中国通号天津工程公司施工,广东新岸线公司提供技术并负责系统集成,在北京铁路局全力支持下,克服京津城际高铁运营线施工困难,于2017年1月全线建成贯通。此后,我国轨道交通两家权威测试单位,中国铁道科学研究院高速铁路系统试验国家工程实验室和北京交通大学轨道交通运行控制系统国家工程研究中心对京津城际高铁EUHT系统工程连续进行第三方独立测试。

测试结果表明,EUHT系统技术各项技术性能指标达到全球领先:在高铁全程300公里/小时高速移动情况下,通信切换可靠性达100%,平均通信延时5ms,空口时延小于1ms,平均传输带宽达150Mbps。这些技术指标超过了目前4G移动通信技术的10倍以上,并达下一代5G技术提出的性能指标挑战要求。

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