论EUHT技术特点及在北京地铁的应用

Discussion on Characteristics of EUHT Technology and Its Application in Beijing Metro

以2.4 GHz WiFi为主的车地无线通信技术已不能完全满足地铁行业的需求,而EUHT系统技术具有高可靠、低时延、大容量和高速移动适应性等优势,能更好地满足地铁行业对车地通信功能的需求。本文介绍了EUHT的技术特点,并与2.4 GHz WiFi、4G、5G等移动通信技术进行了指标对比分析。从承载的车地业务带宽需求、1.8 GHz和5.8 GHz频率选择以及组网方案三个方面进行了阐述。分析总结了北京首都机场线EUHT工程项目的实施过程中的难点,如1.8 GHz和5.8 GHz频率的切换和无线覆盖等。EUHT系统在北京首都机场线正常运营场景下的系统吞吐量、传输时延、丢包率、切换以及1.8 GHz与5.8 GHz网络切换时延等车地无线通信性能指标满足地铁CBTC(基于无线通信的移动闭塞列车控制系统)及综合承载业务的要求,实现了对信号系统、PIS旅客信息系统、VMS视频监控系统、中心列车广播、乘客紧急对讲、航班信息实时发布的综合承载。EUHT系统能够满足轨道交通行业日益增长的需求,提高了地铁运营安全和服务水平。

The 2.4GHz WiFi-based train-ground wireless communication technology can no longer fully meet the needs of the metro industry,while the EUHT system technology has the advantages of high reliability,low latency,large capacity and high-speed mobility adaptability,which can better meet the requirements of the metro industry for train-ground communication functions.This paper introduces the technical characteristics of EUHT,and conducts the index comparative analysis with 2.4GHz WiFi,4G,5G and other mobile communication technologies.This paper expounds from the aspects of bandwidth requirements of the train-ground service,1.8GHz and 5.8GHz frequency selection and networking scheme.The difficulties in the implementation of the EUHT project of Beijing Capital Airport Line are analyzed and summarized,such as switching and wireless coverage of 1.8GHz and 5.8GHz frequency.In the normal operation scenario of the Beijing Capital Airport Line,the train-ground wireless communicating performance indicators such as system throughput,transmission delay,packet loss rate,switching,1.8GHz and 5.8GHz network handover latency of the EUHT system meet the requirements of metro CBTC(moving block train control system based on wireless communication)and integrated carrying services,which realizes the integrated carrying of signal system,PIS passenger information system,VMS video monitoring system,central train broadcasting,passenger emergency intercom,and real-time releasing of flight information.The EUHT system can meet the growing demand of the rail transit industry and improve the safety and service level of metro operation.