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5GS – UE‑Triggered Service Request – 24 of 36
Signalling flow for TS 23.502 UE-Triggered Service Request: SMF to new intermediate UPF: N4 Session Modification Request


Step 17a, verbatim
[Conditional] SMF to new intermediate UPF: N4 Session Modification Request(AN Tunnel Info and List of accepted QFI(s)).
If the SMF selected a new UPF to act as intermediate UPF for the PDU Session in step 5, the SMF initiates a N4 Session Modification procedure to the new I-UPF and provides AN Tunnel Info. The Downlink Data from the new I-UPF can now be forwarded to RAN and UE.