Abstract: As 5G network construction enters a stage of rapid development, 5G mobile communications systems support application scenarios such as enhanced mobile bandwidth, high reliability, low latency, and low power consumption and large connections. In addition to existing mobile Internet applications, The emergence of 5G provides powerful network access for the development of emerging industries such as AR, VR, V2X, and IoT, provides an information infrastructure platform for the rapid development of vertical industries, and lays a solid foundation for the Internet of Everything. The new application scenarios and key technologies of 5G bring convenience, but also bring new security risks and challenges. The combination of 5G and vertical industries also brings new security requirements for 5G. This document provides an in-depth discussion on air interface security for 5G wireless access. This paper discusses 5G wireless air interface security from the aspects of access authentication, air interface encryption and integrity protection, and wireless access privacy protection, providing reference for wireless access security protection technologies during 5G telecom network promotion and construction.

Key words: 5G, air interface security, 5G radio access network, 5G access authentication security, privacy protection

摘要： 当下5G网络建设步入飞速发展阶段，5G移动通信系统支持增强移动带宽、高可靠低时延以及低功耗大连接等应用场景，除现有的移动互联网应用外，5G的出现为AR、VR、车联网、物联网等新兴产业的发展提供了强有力的网络接入、为垂直行业的快速发展提供了信息基础平台，为万物互联打下坚实基础．而5G新的应用场景、关键技术带来便利的同时，也带来了新的安全风险和安全挑战，而5G与垂直行业的结合，也为5G带来新的安全需求，本文就5G无线接入空口安全，展开进行深入讨论，从接入认证，空口加密与完整性保护，无线接入隐私保护等方面进行5G无线空口安全展开探讨，为5G电信网络在推广建设过程中，提供无线接入安全防护技术参考．

关键词: 5G, 空口安全, 5G无线接入网, 5G接入认证安全, 隐私保护