目录
前言
参考资料
5G NAS
5G NAS信令流程
注册
5GMM common procedures
5GSM processes
SUCI encryption
Authentication/NAS Security
总结
本文记录一些5G NAS相关的基础知识,针对的是独立组网(SA).
5G NAS协议分为移动管理(5GMM)和会话管理(5GSM)。
5GMM包括UE鉴权、安全模式控制、移动处理等。
5GSM用于处理UE和SMF之间的PDU会话,UE和SMF之间的交互需要AMF。
5GMM:5GS 移动性管理
5GSM:5GS会话管理
上图是5GMM的主要注册流程,包含了注册,认证,加密的NAS信令。
其他信令流程省略。可参考24501
It is usually initiated when the UE is in the 5GMM-CONNECTED state.
1) Initiated by the network:
·network-initiated NAS transport
·primary authentication and key agreement procedure
·security mode control
·generic UE configuration update
·identification
2) Initiated by UE:
·UE-initiated NAS transport
3) Initiated by the UE or the network, it is used to report some error conditions detected when receiving 5GMM protocol data:
·5GMM status
只有在 UE 和 AMF 之间建立了 5GMM 上下文,并且 AMF 在 5GMM 程序启动了 NAS 消息的安全交换时,才能执行 5GSM 程序。一旦 UE 成功注册 对于 PLMN,可以建立 PDU 会话。 如果尚未建立 5GMM 上下文,则 5GMM 子层必须先启动 5GMM 上下文的建立。
There are also three types of 5GSM processes:
Procedures related to PDU sessions
1) Initiated by the network for authentication or operation of PDU session:
·PDU authentication and authorization
·network-initiated PDU session modification
·network-initiated PDU session release
2) Initiated by the UE, it is used to request the establishment of PDU session or the handover of existing PDU (3GPP access and non-3GPP access) / conversion (EPS to 5GS)
Transaction related procedures
·UE-requested PDU session modification
·UE-requested PDU session release
Common procedure:
·5GSM status procedure
下一篇讲述
下一篇讲述
首先要清楚NAS信令流程。
下一篇再详细讲述5G NAS认证/加密