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Ti+  for  TS 23.502§4.2.3.2
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5GS-S1. UE‑Triggered Service Request
18 of 38 
Signalling flow for TS 23.502 UE-Triggered Service Request: old UPF (intermediate) to UPF (PSA): buffered downlink data forwarding


Step 10, verbatim
[Conditional] old UPF (intermediate) to UPF (PSA): buffered downlink data forwarding
If the old I-UPF is removed and no new I-UPF is assigned for the PDU Session and forwarding tunnel was established to the UPF (PSA), the old (intermediate) UPF forwards its buffered data to the UPF (PSA) acting as N3 Terminating Point.