中国国内5G系统已经开始商用，第一个5G系统演进版本的标准化已经完成。首先基于目前普遍采用的LTE-M介绍了城市轨道交通车地通信系统的概况和需求，分析了5G通信系统的关键技术及在城市轨道交通车地通信环境中的适用性，最后讨论提出了未来5G通信系统在城市轨道交通车地通信系统中的一些设计思路和方案，指出LTE-M加5G的NR-U是未来城市轨道交通车地通信建设的可行方案。随着车地通信业务的发展，5G系统将可能应用于未来的城市轨道交通车地通信中并发挥重要的作用。

Currently, 5G communications systems are already commercially available in China, and the first version of 5G has been standardized. The LTE-M system has been widely adopted in urban rail train wayside communications, and an overview and the requirements of urban rail train wayside communications based on LTE-M are first presented in this paper. Then, the key technologies and the feasibility of 5G communications in urban rail train wayside communications are analyzed. Certain design schemes for the application of 5G systems are presented in the following section, and LTE-M along with NR-R are considered as candidate schemes in future urban rail communications systems. The 5G communications system will play an important role, possibly in the development of communications services in urban rail systems.

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自然科学基金项目资助(61973026)