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


Step 9, verbatim
[Conditional] old UPF (intermediate) to new UPF (intermediate): buffered downlink data forwarding
If the I-UPF is changed and forwarding tunnel was established to the new I-UPF, the old (intermediate) UPF forwards its buffered data to the new (intermediate) UPF acting as N3 terminating point.