name: AKA
full_form: Authentication and Key Agreement
context: 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.
description: Authentication and Key Agreement (AKA) is a Procedure used in the 5G system for UE authentication and key agreement between the User Equipment (UE) and the network. It is utilized by the Authentication Server Function (AUSF) to provide UE authentication services, including recovering from synchronization failure situations.
explanation: AKA is classified as a Procedure because it defines the rules and procedures for authenticating user equipment and agreeing on keys between the UE and the network, which aligns with the definition of a protocol in the context of 3GPP specifications.
section_title: 14.1 Services provided by AUSF 14.1.1 General
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biotag_Description: B-Protocol,I-Protocol,I-Protocol,I-Protocol,O,O,O,O,O,O,O,B-Technology,O,O,B-Device,O,O,O,O,O,O,B-Device,I-Device,O,O,O,O,O,O,O,O,O,B-Network Function,I-Network Function,I-Network Function,O,O,O,B-Device,O,O,O,O,O,O,O,O