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Ti+  for  TS 23.502§4.2.3.2
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5GS-S1. UE‑Triggered Service Request
13 of 38 
Signalling flow for TS 23.502 UE-Triggered Service Request: UPF (PSA) to SMF - N4 Session Modification Response message


Step 7b, verbatim
The UPF (PSA) sends N4 Session Modification Response message to SMF.
If requested by SMF, the UPF (PSA) sends CN DL tunnel info for the old (intermediate) UPF to the SMF. The SMF starts a timer, to be used in step 22a to release the resource in old intermediate UPF if there is one.
If the UPF that connects to RAN is the UPF (PSA), and if the SMF finds that the PDU Session is activated when receiving the Nsmf_PDUSession_UpdateSMContext Request in step 4 with Operation Type set to "UP activate" to indicate establishment of User Plane resources for the PDU Session(s), it deletes the AN Tunnel Info and initiates an N4 Session Modification procedure to remove Tunnel Info of AN in the UPF.