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full Contents for  TS 23.502  Word version:   16.4.0

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1…   4.2.2.2.2   4.2.2.2.3…   4.2.3…   4.2.3.3   4.2.4…   4.2.6   4.2.7…   4.2.9…   4.3…   4.3.2.2…   4.3.2.2.2   4.3.2.2.3…   4.3.3   4.3.4   4.3.5…   4.3.5.2…   4.3.5.4…   4.3.5.6…   4.3.6…   4.4…   4.5…   4.9…   4.9.1.3…   4.9.2…   4.11…   4.11.1.2.2…   4.11.1.3…   4.11.1.4…   4.11.1.5…   4.11.2   4.11.3…   4.12…   4.12.6…   4.12a   4.12b   4.13…   4.13.4…   4.13.6…   4.14…   4.15…   4.15.4…   4.16…   4.16.4…   4.16.8…   4.17…   4.17.9…   4.18…   4.19…   4.23…   4.23.7…   4.23.9…   4.23.11…   4.24   4.25   4.26…   5…   5.2.3…   5.2.5…   5.2.6…   5.2.7…   5.2.8…   5.2.9…   5.2.12…   A…   E…   F…

 

F  Information flows for 5GS integration with TSN [R16]Word-p. 557
Information flows for 5GS integration with TSN
This annex defines the procedures for 5GS integration with TSN fully-centralized model as defined in IEEE P802.1Qcc [65], it includes 5GS Bridge information reporting and 5GS Bridge configuration.
F.1  5GS Bridge information reporting
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Identities of 5GS Bridge and UPF/NW-TT ports are pre-configured on the UPF based on deployment.
Step 1.
PDU Session Establishment as defined clause 4.3.2.2.1 is used to establish a PDU Session serving for TSC.
During this procedure, the SMF selects a UPF, which supports functions as defined in clause 5.28.1 of TS 23.501, for the PDU Session.
During this procedure, the SMF receives the UE-DS-TT residence time, DS-TT MAC address for this PDU Session and port management capabilities from the DS-TT/UE in PDU Session Establishment request, and receives the allocated port number for DS-TT Ethernet port, port number(s) for the serving NW-TT Ethernet port(s) and Bridge ID in N4 Session Establishment Response message. The SMF requests the UPF/NW-TT to report the time comparison between TSN GM time and 5G GM time. The UPF allocates the port number for DS-TT and decides port number for NW-TT, Bridge ID after receiving N4 Session Establishment Request message.
Step 2.
The SMF sends the information received in step 1 to the TSN AF via PCF to establish/modify the 5GS Bridge. The TSN AF stores the binding relationship between 5GS Bridge ID, MAC address of the DS-TT Ethernet port, the port number of the DS-TT Ethernet port, port numbers of NW-TT Ethernet ports for the 5GS Bridge and also updates 5GS bridge delay as defined in clause 5.27.5 of TS 23.501 for future configuration.
Step 3.
If supported according to the port management capabilities received from DS-TT, TSN AF retrieves txPropagationDelay and Traffic Class table from DS-TT. TSN AF also retrieves txPropagationDelay and Traffic Class table from NW-TT.
Step 4.
If DS-TT supports neighbor discovery according to the port management capabilities received from DS-TT, then TSN AF:
  • provides DS-TT port neighbor discovery configuration to DS-TT to configure and activate the LLDP agent in DS-TT;
  • subscribes to receive Neighbor discovery information for each discovered neighbor of DS-TT (see Table 5.28.3.1-1 in TS 23.501.
If DS-TT does not support neighbor discovery, then TSN AF:
  • provides DS-TT port neighbor discovery configuration to NW-TT to configure and activate the LLDP agent in NW-TT to perform neighbor discovery on behalf of DS-TT;
  • subscribes to receive Neighbor discovery information for each discovered neighbor of DS-TT from NW-TT (see Table 5.28.3.1-1 in TS 23.501.
TSN AF:
  • writes NW-TT port neighbor discovery configuration to NW-TT to configure and activate the LLDP agent in NW-TT;
  • subscribes to receive Neighbor discovery information for each discovered neighbor of NW-TT (see Table 5.28.3.1-1 in TS 23.501).
Step 5.
TSN AF receives notifications from NW-TT on discovered neighbors of DS-TT and NW-TT.
Step 6.
The TSN AF constructs the above received information as 5GS Bridge information and sends them to the CNC to register a new TSN Bridge or update an existing TSN Bridge.
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F.2  5GS Bridge configurationWord-p. 558
For 5GS integrating with fully-centralized model TSN network, the CNC provides TSN information to the AF.
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Step 1.
CNC provides TSN information according to IEEE 802.1Q [66] clause 8.6.5.1 to AF to derive TSN QoS information and related flow information. The CNC provide the forwarding rule to AF according to IEEE 802.1Q [66]. The TSN AF uses this information to identify the DS-TT MAC address of corresponding PDU session.
Step 2.
The AF determines the MAC address of a PDU Session based on the previous stored associations, then triggers an AF request procedure. The AF request includes the DS-TT MAC address of the PDU session.
Based on the information received from the CNC, 5GS bridge delay information and the UE-DS-TT residence time, the TSN AF determines the TSN QoS parameters and TSN QoS container for TSN streams and sends them to the PCF.
Step 3.
When PCF receives the AF request, the PCF finds the correct SMF based on the DS-TT MAC address of the PDU session and notifies the SMF via Npcf_SMPolicyControl_UpdateNotify message.
After mapping the received TSN QoS parameters for TSN streams to 5GS QoS, the PCF triggers Npcf_SMPolicyControl_UpdateNotify message to update the PCC rule to the SMF. The PCC rule includes the TSN QoS container.
Step 4.
SMF may trigger the PDU Session Modification procedure to establish/modify a QoS Flow to transfer the TSN streams. During this procedure, the SMF provides the information received in PCC rules to the UPF via N4 Session Modification procedure. The SMF calculates the TSCAI and sends it to NG-RAN.
Upon reception of TSN QoS container, the SMF determine the TSCAI for QoS flow and sends the TSCAI along with the QoS profile to the NG RAN.
Step 5.
If needed, the TSN CP provides additional information (e.g. the gate control list as defined in IEEE 802.1Qbv [67]) to the TSN AF.
Step 6.
The AF determines the MAC address of a PDU Session for the configured port based on the previous stored associations, this is used to deliver the Port Management information to the correct SMF that manages the port via PCF. The AF triggers an AF request procedure. The AF request includes the DS-TT MAC address (i.e. the MAC address of the PDU Session), TSN AF Parameters, Port Management information Container and the related port number as defined in clause 5.28.3 of TS 23.501. The port number is used by SMF to decide whether the configured port is in DS-TT or NW-TT.
Step 7.
The PCF determines the SMF based on the MAC address received in the AF request, the PCF maps the TSN QoS parameters provided by the AF to PCC rules as described in clause 5.28.4 in TS 23.501. The PCF associates the TSN AF QoS container as received from the AF with the PCC rules and forwards the TSN AF QoS container along with the PCC rules to the SMF. The PCF transparently transports the received Port Management information Container and related port number to SMF via Npcf_SMPolicyControl_UpdateNotify message.
Step 8a.
If the SMF decides the port is on DS-TT based on the received port number, the SMF transports the received Port Management information Container to the UE/DS-TT in PDU Session Modification Request message.
Step 8b.
If the SMF decides the port is on NW-TT based on the received port number, the SMF transports the received Port Management information Container to the UPF/NW-TT in N4 Session Modification Request message.
If the UPF sends a Clock Drift Report to the SMF (after detecting drift of offset or change in the cumulative rateRatio between TSN GM time and 5G GM time), the SMF adjusts the Burst Arrival Time and Periodicity from a TSN clock to the 5G clock and sends the updated TSCAI to NG-RAN.
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G  Change historyWord-p. 560

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