Section: 5.2.8.2.6 Nsmf_PDUSession_UpdateSMContext service operation
Content: Service operation name: Nsmf_PDUSession_UpdateSMContext. Description: It allows to update the AMF-SMF association to support a PDU Session and/or to provide SMF with N1/N2 SM information received from the UE or from the AN, or allows to establish forwarding tunnel between UPFs controlled by different SMFs (e.g. by UPF controlled by old I-SMF and UPF controlled by new I-SMF). Input, Required: SM Context ID. Input, Optional: N1 SM container received from the UE, N2 SM information received from the AN (e.g. N3 addressing information, notification indicating that the QoS targets cannot be fulfilled for a QFI, Secondary RAT Usage Data), Operation Type (e.g. UP activate, UP deactivate, UP To Be Switched), Serving GW Address(es) and Serving GW DL TEID(s) for data forwarding during HO from 5GS to EPS, UE location information, AN type, UE Time Zone, H-SMF identifier/address, EPS Interworking indication, EBI(s) to be revoked, PDU Session(s) to be re-activated, Direct Forwarding Flag, ARP list, S-NSSAI, Data Forwarding Tunnel (setup/release), UE presence in LADN service area, Target ID, Target AMF ID, GUAMI, backup AMF(s) (if NF Type is AMF), Indication of Access Type can be changed, RAT Type. Backup AMF(s) sent only once by the AMF to the SMF in its first interaction with the SMF. Release indication and release cause, forwarding tunnel information, Handover Complete Indication, Relocation Cancel Indication. MA PDU request indication, MA PDU Network-Upgrade Allowed indication, Indication on whether the UE is registered in both accesses, access on which signalling was received, Subscription to DDN Failure Notification, NEF Correlation ID, MO Exception Data Counter, access for MA PDU Session Release, list of NWDAF IDs and corresponding Analytics ID(s), Satellite backhaul category, GEO Satellite ID, N9 forwarding tunnel to support the EAS session continuity required, target UL CL tunnel info for N9 forwarding tunnel to support the EAS session continuity, value of the timer to detect the end of activity on the N9 forwarding tunnel to support the EAS session continuity, CN based MT handling indication, Alternative S-NSSAI, Indication of UE supporting non-3GPP access path switching, Indication of non-3GPP access path switching while using old AN resources. Output, Required: Result Indication. Output, Optional: PDU Session ID, Cause, released EBI list, allocated EBI information, N2 SM information (e.g. QFI, UE location information, notification indication indicating that the QoS targets cannot be fulfilled), N1 SM container to be transferred to the AN/UE, type of N2 SM information. MA PDU session Accepted indication, list of NWDAF IDs and corresponding Analytics ID(s), source UL CL tunnel info for N9 forwarding tunnel info to support the EAS session continuity. See clause 4.3.3.2 and clause 4.3.3.3 for an example usage of this service operation. See clause 4.9.1.2.2 for the usage of the "UP To Be Switched" Operation Type. For the use of the "EBI(s) to be revoked" information, see clause 4.11.1.4.1. For the use of the "Direct Forwarding Flag", see clause 4.11.1.2.2.2. For the use of the "Indication of Access Type can be changed", see clause 4.2.3.2. For the use of "release indication and release cause", see clause 4.3.4.2. For the use of the "forwarding tunnel information", see clause 4.23.4.3. If the consumer NF is AMF and the SMF determines that some EBIs are not needed, the SMF will put the EBIs back in the released EBI list. If the consumer NF is AMF and Inter-system mobility happens, the SMF sends allocated EBI information to AMF. If the ARP of QoS flow is changed, the SMF uses this operation to update EBI-ARP information in the AMF. If the AMF does not have PDU Session ID, the PDU Session ID is not required for Input and is required for Output. If consumer NF is AMF and SMF includes N2 SM information in the Output, the SMF indicates type of N2 SM information. The Small Data Rate Control Status is included if a PDU Session is being released and the UPF or NEF provided Small Data Rate Control Status for the AMF to store. APN Rate Control Status is included if a PDU Session is being released and the UPF or NEF provided APN Rate Control Status for the AMF to store. NOTE: The N2 SM information is not interpreted by the AMF. See clauses 4.22.6.3, 4.22.9 and 4.22.10.2 for detailed usage of this service operation for ATSSS.