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5GS – UE‑Triggered Service Request – 35 of 36
Signalling flow for TS 23.502 UE-Triggered Service Request: SMF to old UPF: N4 Session Modification Request or N4 Session Release Request


Step 22a, verbatim
[Conditional] SMF to old UPF: N4 Session Modification Request or N4 Session Release Request.
If the SMF decided to continue using the old UPF in step 5, the SMF sends an N4 Session Modification Request, providing AN Tunnel Info.
If the SMF decided to select a new UPF to act as intermediate UPF in step 5, and the old UPF is not PSA UPF, the SMF initiates resource release, after timer in step 6b expires, by sending an N4 Session Release Request (Release Cause) to the old intermediate UPF.