Abstract: This paper analyzes the existing transmission network, data network, mobile communication network and other railway communication system architecture and shortcomings, points out that the railway communication system will evolve to the direction of service grouping, flat architecture, application virtualization, equipment generalization and centralized maintenance, and analyzes the networking scheme of the next generation railway communication system based on cloud computing, IP packet switching, software defined network, network function virtualization and network slicing technology in detail. The study of the evolution direction and overall architecture of the next generation railway communication system is of guiding significance to the development of railway communication in China.

Key words: cloud computing, railway 5G, next-generation railway communication system, IP packet switching, network functions virtualization

摘要： 分析现有传输网、数据网、移动通信网等铁路通信系统构架及存在的不足，指出既有铁路通信系统将向业务分组化、架构扁平化、应用虚拟化、设备通用化、维管集中化方向演进。详细分析基于云计算、IP分组交换、软件定义网络、网络功能虚拟化和网络切片技术的新一代铁路通信系统组网方案。研究新一代铁路通信系统演进方向和系统总体架构，对国内铁路通信的发展具有指导意义。

关键词: 云计算, 铁路5G, 新一代铁路通信系统, IP分组交换, 网络功能虚拟化