介绍基于无线局域网(WLAN)的车地无线技术在高速轨道交通场景中的通信性能测试项目的、测试情况以及测试结果，测试组网采用5?725～5?850 MHz频段80 MHz频宽组网，轨旁AP设备按照间距200 m的间隔进行部署。通过测试验证了WLAN技术在列车高速移动场景下的各项通信性能指标，经过测试验证WLAN车地无线链路平均切换时延小于12 ms、平均丢包率小于0.1%、平均传输时延小于2 ms。在120 km/h、160 km/h场景下车地通信速率可达到350 Mbps以上，在80 km/h场景下车地通信速率可达到450 Mbps以上。本次测试可为后续市域铁路等高速轨道交通项目乘客信息系统业务承载提供参考依据。

This study briefly introduces the test results of the communication performance between the train-ground wireless technology based on WLAN in the high-speed rail transit scene. The test used a frequency band of 5725 MHz – 5850 MHz and adopted bandwidth of 80 MHz, and the trackside AP equipment was deployed 200 m intervals. The communication performance indexes of the WLAN technology in high-speed train moving scenarios were verified through tests. The test confirmed that the WLAN train-ground average wireless link switching delay is less than 12 ms, the average packet loss rate is less than 0.1%, and the average transmission delay is less than 2 ms, respectively. At 120 km/h and 160 km/h, the communication rate at the scene of alighting can reach above 350 mbps, and at 80 km/h, it can reach above 450 mbps. Through the test, the communication performance shows that WLAN technology is well-adapted to the high-speed train moving scene, and this research also provides a reference point for future high-speed rail transit projects.

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