近年来,伴随着各地城市轨道交通行业的飞速发展,轨道交通这一便捷的出行方式得到了人们的青睐,轨道交通运营的安全问题也因此受到各级政府和人民群众的高度重视和密切关注。然而,随着“无线智慧城市”的推广,无线电磁环境复杂化,民用WIFI对轨道交通信号系统中的车-地通信部分的影响日益严重。目前,我国大多数城市在建和使用的轨道交通车-地通信网络采用的都是WLAN技术,传输频段为2.4 GHz。笔者介绍了城市轨道交通车-地通信网络系统现状,进一步分析LTE技术及LTE技术在城市轨道交通CBTC系统中的应用、技术优势,并给出实际的实施方案。 In recent years, along with the rapid development of urban rail transit industry in all parts of the country, the convenient mode of rail transit has gained people’s favor. The safety of rail transit operation is therefore highly valued and closely watched by all levels of government and people. However, with the promotion of Wireless Smart City and the complicated radio-magnetic environment, the impact of civil WIFI on the car-ground communication part of the rail transit signaling system is becoming increasingly serious. At present, most of the cities in our country are constructing and using rail transit-to-ground communication networks using WLAN technology with a transmission frequency band of 2.4 GHz. The author introduces the status quo of urban rail transit vehicle-to-ground communication network system, further analyzes the application of LTE technology and LTE technology in urban rail transit CBTC system and its technical advantages, and gives the actual implementation plan.