name: NSI
full_form: Network Slice Instance
context: To describe the UE Authentication by AUSF and NSI, we propose a possible procedure, which is compatible to the Network Slice Architectures in clause 6.1.1, 6.1.2, and 6.1.3 of TR 23.799 [2]. Figure 5.8.4.3.2.1: UE Authentication by AUSF and NSI UE and AUSF perform mutual authentication for Network Access. UE and AUSF derive AUSF Base Key. (AUSF Base Key indicates a key corresponding to the KASME in LTE) Editorâs note: How the AUSF Base Key is derived is FFS. ARPF generates NSI-specific Master Keys using ARPF Master Key and sends it to each NSI via AUSF. (ARPF Master Key indicates a key corresponding to the Ki in LTE) UE also derives NSI-specific Master Keys in the same way as in ARPF. NSI-specific Master Keys can be derived using the ARPF Master Key and NSI specific information such as Network Slice ID, etc. Editorâs note: It is assumed that the NSI-specific Master Key is derived and sent to each NSI by ARPF since the Master Key (e.g., Ki in LTE) is stored and used for authentication
description: A Network Slice Instance (NSI) is a network function that manages and orchestrates network slices, enabling customized network services and performance. It interacts with other network functions such as the Authentication Credential Repository and Processing Function (ARPF) and the Authentication Server Function (AUSF) to perform authentication and key management for network access.
explanation: The context describes NSI's role in UE authentication, deriving master keys, and interacting with ARPF and AUSF. This indicates that NSI is a network function responsible for managing network slices and performing specific tasks within the network.
section_title: 5.8.4.3.2	Solution details
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