name: MUK
full_form: Multicast User Key
context: the UE still uses the current MUK. The UE will also try to process the MBS traffic with its known group key to avoid introducing unnecessary delays. The MUK and group key may be updated based on update policy after re-authentication. NOTE 2: The details of MUK derivation will be discussed in the normative work. NOTE 3: Depending on which solutions are concluded to be chosen for KI#1 and KI#3, the details related to "reauthentication" and "protection of MBS traffic" and "MUK/group key update" might need to be adapted. This can be left to normative phase. 10. (MB)-SMF requests MUK and sends Multicast_group_ID to AUSF. 11. AUSF derives Multicast User Key (MUK) based on Kasuf and Multicast_group_ID. When re-authentication runs, the AUSF is not required to generate a new MUK immediately. The MUK is derived when request is received from SMF. 12. AUSF responds to SMF with MUK. 13. (MB)-SMF distributes MUK to MBSF-C. 14. MBSF-C receives and stores the MUK. Afterwards, ACK is responded to SMF.
description: The Multicast User Key (MUK) is a critical network attribute used for secure multicast communication in the 5G network. It is derived by the AUSF based on Kasuf and Multicast_group_ID, and is used to protect MBS traffic.
explanation: The context explicitly mentions the derivation, distribution, and usage of MUK for securing multicast communications, which justifies its classification as a Parameter.
section_title: 6.2.2	Solution details
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biotag_Description: O,B-Parameter,I-Parameter,I-Parameter,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Technology,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,O,O,B-Service,O