5.28.3.2 Transfer of port or user plane node management information

Port management information is transferred transparently via 5GS between TSN AF or TSCTSF and DS-TT or NW-TT, respectively, inside a Port Management Information Container (PMIC). User plane node management information is transferred transparently via 5GS between TSN AF or TSCTSF and NW-TT inside a user plane node Management Information Container (UMIC). The transfer of port or user plane node management information is as follows:

• To convey port management information from DS-TT or NW-TT to TSN AF or TSCTSF:
• DS-TT provides a PMIC and the DS-TT port MAC address (if available) to the UE, which includes the PMIC as an optional Information Element of an N1 SM container and triggers the UE requested PDU Session Establishment procedure or PDU Session Modification procedure to forward the PMIC to the SMF. SMF forwards the PMIC and the port number of the related DS-TT port to TSN AF or TSCTSF as described in clauses 4.3.2.2 and 4.3.3.2 of TS 23.502 [3];
• NW-TT provides PMIC(s) and/or UMIC to the UPF, which may trigger the N4 Session Level Reporting Procedure to forward the PMIC(s) and/or UMIC to SMF. UPF selects an N4 session corresponding to any of the N4 sessions for this NW-TT. SMF in turn forwards the PMIC(s) and the port number(s) of the related NW-TT port(s), or the UMIC, to TSN AF or TSCTSF as described in clause 4.16.5.1 of TS 23.502 [3].
• NW-TT may provide PMIC(s) and/or UMIC to the UPF, which may trigger UPF Event Exposure Notification to forward the PMIC(s) and/or UMIC to TSN AF or TSCTSF. UPF directly reports TSC management information event via Nupf_EventExposure_Notify service operation as described in clause 5.2.26.2 of TS 23.502 [3].

NOTE 1: There has to be at least one established PDU session for DS-TT port before the UPF can report PMIC/UMIC information towards the TSN AF or TSCTSF.

• To convey port management information from TSN AF or TSCTSF to DS-TT:
• TSN AF or TSCTSF provides a PMIC, DS-TT port MAC address or UE IP address (applicable for TSCTSF only) reported for a PDU Session (i.e. MAC address of the DS-TT port or IP address related to the PDU session) and the port number of the DS-TT port to manage to the PCF by using the AF Session level Procedure, which forwards the information to SMF based on the MAC or IP address using the PCF initiated SM Policy Association Modification procedure as described in clause 4.16.5.2 of TS 23.502 [3]. SMF determines that the port number relates to a DS-TT port and based on this forwards the PMIC to DS-TT using the network requested PDU Session Modification procedure as described in clause 4.3.3.2 of TS 23.502 [3].
• To convey port or user plane node management information from TSN AF or TSCTSF to NW-TT:
• TSN AF or TSCTSF selects a PCF-AF session corresponding to any of the DS-TT MAC or IP addresses (applicable for TSCTSF only) for the related PDU sessions of this bridge or router and provides a PMIC(s) and the related NW-TT port number(s) and/or UMIC to the PCF. The PCF uses the PCF initiated SM Policy Association Modification procedure to forward the information received from TSN AF or TSCTSF to SMF as described in clause 4.16.5.2 of TS 23.502 [3]. SMF determines that the included information needs to be delivered to the NW-TT either by determining that the port number(s) relate(s) to a NW-TT port(s) or based on the presence of UMIC and forwards the container(s) and/or related port number(s) to NW-TT using the N4 Session Modification procedure described in clause 4.4.1.3 of TS 23.502 [3].