Section: 4.16.15 Negotiations for planned data transfer with QoS requirements 4.16.15.1 General
Content: The intent of this clause is to specify generic service procedures to enable the AF to negotiate viable time window for the planned application data transfer with specific QoS requirements and operational conditions via the support of the NEF. The PDTQ policies are defined for a specific ASP and each PDTQ policy includes a recommended time window for the traffic transfer for each of the AF sessions involved. The Network Performance analytics or DN Performance analytics for NWDAF as described in TS 23.288[ Architecture enhancements for 5G System (5GS) to support network data analytics services ]  [50] will be subscribed by the PCF in order to assist its decision to derive the PDTQ policies. One or more negotiated PDTQ policies could be provided by PCF to AF via NEF together with the PDTQ Reference ID. If the AF receives more than one PDTQ policies from the PCF, the AF will select one of them and inform the PCF about the selected PDTQ policy which will then be stored in the UDR. The selected PDTQ policy might be renegotiated, i.e. due to the degradation of the network performance. In this case, the PCF may determine a new list of candidate PDTQ policies and notify the AF via NEF. The AF may select one of the new PDTQ polices or not accept any of the PDTQ policies, it then notifies the PCF of the corresponding decision. Prior to the start of the selected time window for the planned data transfer, the AF requests the PCF to set up the AF session with required QoS. The PCF will then determine the appropriate PCC rules according to the AF request.