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5GS-S1. UE‑Triggered Service Request
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Signalling flow for TS 23.502 UE-Triggered Service Request: NAS authentication/security procedure


Step 3, verbatim
If the Service Request was not sent integrity protected or integrity protection verification failed, the AMF shall initiate NAS authentication/security procedure as defined in clause 4.6.
If the UE in CM-IDLE state triggered the Service Request to establish a signalling connection only, after successful establishment of the signalling connection the UE and the network can exchange NAS signalling and steps 4 to 11 and 15 to 22 are skipped.
If the procedure was triggered in response to paging or NAS notification indicating non-3GPP access, and the AMF received N1 SM Container only from the SMF in step 3a of clause 4.2.3.3, the AMF sends the NAS signalling including the N1 SM Container to the UE in step 7 of clause 4.2.3.3 without updating the access associated to the PDU Session