name: AAA
full_form: Authentication, Authorization, Accounting
context: Figure 16.4-1: AAA Server initiated Network Slice-Specific Re-authentication and Re-authorization procedure 0. The UE is registered in 5GC via an AMF. The AMF ID is stored in the UDM. 1. The AAA-S requests the re-authentication and re-authorization for the Network Slice specified by the S-NSSAI/ENSI in the Re-Auth Request message, for the UE identified by the GPSI in this message. This message is sent to an AAA-P, if the AAA-P is used (e.g. the AAA Server belongs to a third party), otherwise it may be sent directly to the NSSAAF. If an AAA-P is present, the AAA-P relays the Reauthentication Request to the NSSAAF. 2. The NSSAAF checks whether the AAA-S is authorized to request the re-authentication and re-authorization by checking the local configuration of AAA-S address per S-NSSAI. If success,the NSSAAF requests UDM for the AMF serving the UE using the Nudm_UECM_Get (GPSI, AMF Registration) service operation. The UDM provides the NSSAAF with the AMF ID of the AMF serving the UE. 3. The NSSAAF provides an acknowledgement to the AAA protocol Re-Auth Request message. If the AMF is not registered in UDM the procedure is stopped here. 4. If the AMF is registered in UDM, the NSSAAF requests the relevant AMF to re-authenticate/re-authorize the S-NSSAI for the UE using the Nnssaaf_NSSAA_Re-authenticationNotification service operation. The AMF is implicitly subscribed to receive Nnssaaf_NSSAA_Re-authenticationNotification service operations. The NSSAAF may discover the Callback URI for the Nnssaaf_NSSAA_Re-authenticationNotification service operation exposed by the AMF via the NRF. The AMF acknowledges the notification of Re-authentication request. 5. If the UE is registered with the S-NSSAI in the Mapping Of Allowed NSSAI, the AMF triggers the NSSAA procedure defined in clause 16.3 for the UE identified by the GPSI and the Network Slice identified by the S-NSSAI received from the NSSAAF. If the UE is registered but the S-NSSAI is not in the Mapping Of Allowed NSSAI, the AMF removes any status of the corresponding S-NSSAI subject to Network Slice-Specific Authentication and Authorization in the UE context it may have kept, so that an NSSAA is executed next time the UE requests to register with the S-NSSAI.
description: AAA (Authentication, Authorization, Accounting) is a Protocolin telecommunications that refers to the process of verifying the identity of users or devices (authentication), determining their level of access to network resources (authorization), and tracking their usage for billing or security purposes (accounting). In the context provided, AAA is used in a network slice-specific re-authentication and re-authorization procedure initiated by an AAA server.
explanation: AAA is classified under protocol because it deals with the management of user access to network resources, which is a fundamental aspect of telecommunications. The concept involves protocols and mechanisms for secure authentication, authorization, and accounting, making it a critical component in ensuring the security and integrity of telecommunications networks.
section_title: 16.4 AAA Server triggered Network Slice-Specific Re-authentication and Re-authorization procedure
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