Abstract: The paper studies the function of EIR in 5G-R network simply, describes importance and necessity of EIR, introduces main technical standard and message format of EIR, and discusses demands for supporting functions of EIR. At last, the paper puts forward the network planning and setting scheme of EIR, then it puts forward the sunmaries of the EIR.

Key words: EIR, core network, 5G-R, network function (NF), GSM-R

摘要： 对5G-R网络中的EIR功能进行简要研究，说明EIR的重要性和必要性；介绍EIR的主要标准、基本消息格式；探讨EIR的后台有关功能需求；简要提出和分析EIR的网络规划与设置方案；最后对EIR整体进行总结。

关键词: EIR, 核心网, 5G-R, 网络功能（NF）, GSM-R