name: NSSF
full_form: Network Slice Selection Function
context: a protected NAS container in the Registration Request message. 2. Steps 2-6b of TS 23.502 [2], clause 4.2.2.2.3 are followed. 3. The initial AMF based on local policy and subscription information, decides to reroute the RR message to a target AMF via RAN. The initial AMF requests a protection key from the NSSF for the purpose of AMF re-allocation and provides the RR and the target AMF set or target AMF address(es) as input. NOTE 1: The details of key generation and key identifier generation on the NSSF can be specified in the normative phase. NOTE 2: The NSSF is one potential choice of a serving network NF that could host security context protection keys. Another choice could be an NRF which is shared among slices or an NRF that is PLMN-wide. 4. The NSSF uses one or more of the provided inputs in Step 3 to generate a key Kamfreal and a key identifier/token Kamfreal ID. The NSSF stores the key, key identifier/token and the provided input (RR, target AMF address(es)). 5. The NSSF
description: The Network Slice Selection Function (NSSF) generates protection keys for AMF re-allocation and stores security context protection keys. It is crucial for registration, especially when rerouting Registration Request messages to target AMFs via RAN.
explanation: The NSSF performs specific network functions like key generation and storage for security within the network, as defined in 3GPP TS 33.864, section 6.9.2.
section_title: 6.9.2	Solution details
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biotag_Description: O,B-Network Function,I-Network Function,I-Network Function,I-Network Function,O,O,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O