name: USS
full_form: User Security Setting
context: USS may trigger revocation of UUAA at any time. The below description considers only the security related parameters (for full details of the flows see TS 23.256 [3]). Figure 5.2.1.5-1: UUAA revocation in 5GS 1. The USS sends an UUAA revocation request to UAS-NF. The request includes GPSI and CAA-Level UAV ID. 2. The UAS NF retrieves the UAV UE's context. The UE's context contains identity mapping between the GPSI and the USS identifier that performed UUAA. The UAS-NF verifies the USS revocation request by checking whether the GPSI and the USS identifier of the USS requesting the revocation match the stored mapping of GPSI and USS identifier. The UAS-NF shall only continue the revocation procedures if they match. NOTE 1: The USS identifier is based on the security link on the interface between USS NF and USS (e.g. , the identity mapped during link establishment or the identity in certificate). The UAS NF determines whether the target NF is an AMF or an SMF. - If the target NF is an
description: The User Security Setting (USS) is a network function responsible for managing user security settings and triggering revocation of UUAA at any time. It interacts with other network functions such as UAS-NF, AMF, and SMF to perform security-related tasks.
explanation: The context describes USS as an entity that sends requests to UAS-NF, retrieves UE's context, verifies revocation requests, and determines target NFs, which are all characteristics of a Network Function.
section_title: 5.2.1.5	UUAA Revocation
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