基于WiFi6的城轨车地通信综合承载系统—系统设计与现场测试

An integrated WiFi6 based urban rail train-ground communication systemsystem design and field test

摘要:

2018年10月，IEEE发布了最新的WiFi标准协议802.11ax(WiFi6)，它同时支持2.4 GHz和5 GHz频段，传输速率可达9.6 Gbit/s^[1]。WiFi6的横空出世引起大量技术人员的研究，目前，WiFi6已应用在智能家居、广电、矿井建设等领域，但在轨道交通领域屈指可数。本文设计了基于WiFi6的城市轨道交通车地通信综合承载系统，通过将WiFi6赋能轨道交通车地通信系统，可以解决城市轨道交通的各项生产业务间严重的争抢频率资源问题，并在大连地铁13号线进行全国第一个WiFi6系统的真实地铁线路测试。结果表明，所设计的WiFi6系统具有网络吞吐能力大，传输速率快，覆盖范围广等特点，能够满足轨道交通业务需求，同时能够为CCTV和PIS等业务提供有效的传输通道。

Abstract:

In October 2018, IEEE released the latest WiFi standard protocol 802.11ax(WiFi6). It can support both 2.4 GHz and 5 GHz frequency bands with the maximum transmission rate of 9.6 Gbit/s. At present, WiFi6 has been applied in smart home, radio, and mine construction. However, it is scarcely applied in the field of rail transit. An integrated urban train ground communication system based on WiFi6 is proposed. Aiming to the serious competition for frequency resources between production businesses, the first actual subway line test of the WiFi6 system in the country is conducted on the Dalian Metro Jinpu Line. The entire test process completely replicates the actual running scene of the train, including real vehicles, equipment, and actual communication scenarios such as elevated and tunnels. Extensive test results show that the designed WiFi6 system bears the characteristics of large network throughput, fast communication and transmission rate, long battery life, and strong AP signal coverage, satisfying the rail transit business. It can guarantee the reliable transmission of Communication-Based Train Control(CBTC) traffic and provide an efficient transmission path for Closed Circuit Television(CCTV) and Passenger Information System(PIS) traffic.