Section: 14.1 Services provided by AUSF 14.1.1 General
Content: The AUSF provides UE authentication service to the requester NF by Nausf_UEAuthentication. For AKA based authentication, this operation can be also used to recover from synchronization failure situations. Clause 14.1.2 describes the Nausf_UEAuthentication service. The service operations listed here are used in procedures that are described in clause 6 of the present document and in TS 33.503[ Security Aspects of Proximity based Services (ProSe) in the 5G System (5GS) ]  [109]. Clause 14.1.3 describes the Nausf_SoRProtection service used in procedures that are described in clause 6.14 of the present document. Clause 14.1.4 describes the Nausf_UPUProtection service used in procedures that are described in clause 6.15 of the present document. Since AUSF is completely security-related, all service operations are described in the present document. TS 23.501[ System architecture for the 5G System (5GS) ]  [2], clause 7.2.7, only lists the services and TS 23.502[ Procedures for the 5G System (5GS) ]  [8], clause 5.2.10, provides the reference to the present document.