AS UE Capability Transfer and AS Security: gNB can enquire the UE capability with UE capability enquiry and Information.The message also carries the “AMF UE NGAP ID”, “ UE Aggregate Maximum Bit Rate“, UE security capabilities and security key. The message carries one or more PDU Session setup requests. The message typically contains the Registration Accept NAS message. AMF sends an INITIAL CONTEXT SETUP REQUEST message to gNB to start the initial context establishment process. The gNB will use this id to address the UE context on the AMF. INITIAL CONTEXT SETUP REQUEST: The AMF allocates an “ AMF UE NGAP ID“.UE respond with completion of the NAS security procedure and contains the IMEISV in security mode complete. The AMF signals the selected NAS security algorithm to the UE and requests the IMEISV from the UE as part of NAS security mode command. The detailed authentication procedure can be read from this post. Authentication and NAS Security: The Core network performs Authentication procedure for the UE is legitimate and legally authorized to get service from the network.The UE derives the SUCI by using the provisioned public key of the HPLMN. The UE responds with Identity Response including the SUCI. If there is a change in last AMF selected by gNB and SUCI is not provided by the UE nor retrieved from the old AMF then Identity Request procedure is initiated by AMF sending an Identity Request message to the UE requesting the SUCI. UE NAS Identity Transfer: UE Identity transfer is a conditional.The “ RAN UE NGAP ID” and the “RRC Establishment Cause” are also included in the message. The message carries the “Registration Request” message received from the UE in the RRC Setup Complete message. Initial UE Message: The gNB sends the Initial UE Message to the selected AMF.The AMF will use this id to address the UE context on the gNB. The gNB selects the Access and Mobility Function (AMF) for this session and allocate RAN UE NGAP ID to the UE. Registration request also carries UE network capability information. It also carries the information about selectedPLMN-Identity, registeredAMF, snssai-list. RRC setup Complete + Registration Request: The UE sends the RRC Setup Complete message with a “Registration Request” in the dedicatedNAS-Message. It carries following information elements. The UE stops the timer T300 as it has received the RRC Setup message.
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