5.27.2.3 TSC Assistance Container determination by TSCTSF

The TSCTSF constructs TSC Assistance Container (defined in Table 5.27.2-2) based on information provided (directly or via NEF) by the AF for IP or Ethernet type PDU Sessions, or by the DetNet controller for IP type PDU Sessions.

In the case of an AF request, the AF may provide Flow Direction, Burst Arrival Time (optional) at the UE/DS-TT (uplink) or UPF/NW-TT (downlink), Maximum Burst Size, Periodicity, Survival Time (optional) and a Time Domain (optional) to the TSCTSF. If the AF is able to adjust the burst sending time, the AF may in addition provide a BAT Window or the Capability for BAT adaptation to the TSCTSF. Addtionally if the AF is able to adjust the periodicity, the AF may also provide the Periodicity Range along with the Periodicity to the TSCTSF. Based on these parameters, the TSCTSF constructs a TSC Assistance Container and provides it to PCF. If the AF provides to the TSCTSF a Burst Arrival Time or Periodicity without corresponding Time Domain, the TSCTSF sets the Time Domain = "5GS" in the TSC Assistance Container.

If the AF is able to adjust the transmission time and periodicity then in addition to above parameters, it may provide a BAT Window (optional) or the capability for BAT adaptation (optional), or Periodicity Range (optional), to the TSCTSF.

NOTE: The Maximum Burst Size is signalled separately, i.e. it is not part of the TSC Assistance Container.

The AF provides these parameters to the NEF and the NEF forwards these parameters to the TSCTSF. The AF trusted by the operator provides these parameters to the TSCTSF directly.

In the case of Deterministic Networking, the TSCTSF constructs the TSC Assistance Container based on information provided by the DetNet controller as defined in clause 6.1.3.23b of TS 23.503 [45].

The TSCTSF sends the TSC Assistance Container to the PCF as follows:

• The TSCTSF uses the UE IP address/DS-TT port MAC address to identify the PCF and N5 association related to the PDU Session of a UE/DS-TT.