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Ti+  for  TS 23.502§4.2.3.2
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5GS-S1. UE‑Triggered Service Request
25 of 38 
Signalling flow for TS 23.502 UE-Triggered Service Request: AMF to SMF: Nsmf_PDUSession_UpdateSMContext Request


Step 15, verbatim
[Conditional] AMF to SMF: Nsmf_PDUSession_UpdateSMContext Request (N2 SM information, RAT Type, Access Type) per PDU Session to the SMF. The AMF determines Access Type and RAT Type based on the Global RAN Node ID associated with the N2 interface.
If the AMF received N2 SM information (one or multiple) in step 14, then the AMF shall forward the N2 SM information to the relevant SMF per PDU Session ID. If the UE Time Zone has changed compared to the last reported UE Time Zone then the AMF shall include the UE Time Zone IE in this message.
If the PDU Session is moved from the non-3GPP access to 3GPP access (i.e. N3 tunnel for the PDU Session is established successfully), the SMF and AMF update associated access of the PDU Session. The UE updates associated access of the PDU Session when the user plane resource for the PDU Session is successfully established.
Procedure for unpausing a charging pause initiated earlier is specified in clause 4.3.x.