Method and apparatus for security context processing in 5G during idle mode

• Main Authors: NORRMAN KARL, JOST CHRISTINE, WIVERSON, MONICA, BEN HENDA NOAMEN
• Format: Patent
• Language: Chinese; English
• Published: 25.11.2022
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION; WIRELESS COMMUNICATIONS NETWORKS

The invention relates to a method and apparatus for flexible security context management during AMF changes. One aspect of the present disclosure is a mechanism for implementing backward security during AMF changes in idle mode. Unlike delivering the current NAS key to the target AMF, the source AMF derives a new NAS key and provides the new NAS key to the target AMF along with a key change indication indicating that the NAS key has changed. And the target AMF sends the key change indication to the user equipment. 本公开涉及用于AMF改变期间的灵活的安全性上下文管理的方法和装置。本公开的一个方面是用于在空闲模式下在AMF改变期间实现后向安全性的机制。不同于向目标AMF输送当前NAS密钥，源AMF导出新的NAS密钥，向目标AMF提供新的NAS密钥以及指示NAS密钥已改变的密钥改变指示。目标AMF向用户设备发送该密钥改变指示。