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AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsNoamen Ben Henda, Christine Jost, Karl Norrman, Monica Wifvesson
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The present disclosure relates to methods and apparatus for flexible, security context management during AMF changes. One aspect of the disclosure is a mechanism for achieving backward security during AMF changes. Instead of passing the current NAS key to the target AMF, the source AMF derives a new NAS key, provides the new NAS key to the target AMF, and sends a key change indication to the UE, either directly or through some other network node. The UE can then derive the new NAS key from the old NAS key. In some embodiments, the AMF may provide a key generation parameter to the UE to use in deriving the new NAS key. In other embodiments, the target AMF may change one or more security algorithms.
A method for transferring a security context during a handover of a user equipment, the method implemented by one or more core network nodes in a core network of the wireless communication network, wherein the one or more core network nodes provide a 5G Access and Mobility Management Function, the method comprising:
A core network node in a core network of a wireless communication network, the core network node providing a target 5G Access and Mobility Management Function for the wireless communication network, the core network node comprising:
The core network node of embodiment 17, wherein the processing circuit is further configured to select at least one of the non-access stratum security algorithms based on the user equipment capability information.
Dependencies are inferred from the claim text.