Section: 6.1.4.1a Linking authentication confirmation to Nudm_UECM_Registration procedure from AMF
Content: The information sent from the AUSF to the UDM that a successful or unsuccessful authentication of a subscriber has occurred, shall be used to link authentication confirmation to subsequent procedures. The AUSF shall send the Nudm_UEAuthentication_ResultConfirmation service operation for this purpose as shown in figure6.1.4.1a-1. Figure 6.1.4.1a-1: Linking increased Home control to subsequent procedures 1. The AUSF shall inform UDM about the result and time of an authentication procedure with a UE using a Nudm_UEAuthentication_ResultConfirmation Request. This shall include the SUPI, a timestamp of the authentication, the authentication type (e.g. EAP method or 5G-AKA), and the serving network name. NOTE: It may be sufficient for the purposes of fraud prevention to send only information about successful authentications, but this is up to operator policy. 2. The UDM shall store the authentication status of the UE (SUPI, authentication result, timestamp, and the serving network name). 3. UDM shall reply to AUSF with a Nudm_UEAuthentication_ResultConfirmation Response. 4. Upon reception of subsequent UE related procedures (e.g. Nudm_UECM_Registration_Request from AMF) UDM may apply actions according to home operator’s policy to detect and achieve protection against certain types of fraud (e.g. as proposed in clause 6.1.4.2).