Upon request from the AMF, the AUSF shall execute authentication of the UE. The authentication is performed as described in TS 33.501
. The AUSF selects a UDM as described in TS 23.501 , clause 6.3.8
and gets the authentication data from UDM.
Once the UE has been authenticated the AUSF provides relevant security related information to the AMF. In case the AMF provided a SUCI
to AUSF, the AUSF shall return the SUPI
to AMF only after the authentication is successful.
After successful authentication in new AMF, which is triggered by the integrity check failure in old AMF at step 5, the new AMF invokes step 4 above again and indicates that the UE is validated (i.e. through the reason parameter as specified in clause 22.214.171.124.2
The AMF decides if the Registration Request needs to be rerouted as described in clause 126.96.36.199.3
, where the initial AMF refers to the AMF.