Section: 5.8.2.18 QoS Flow related QoS monitoring and reporting
Content: The SMF may configure the UPF to perform QoS monitoring for a QoS Flow and to report the monitoring results with the help of the following parameters provided in the Session Reporting Rule (SRR) described in clause 5.8.5.11: - QoS monitoring parameter(s) indicating the subject of the QoS monitoring as defined in clause 5.45; - Reporting period indicating the time interval in which a new measurement result and a potential report has to be available. Generally, if no measurement result is available to the UPF within the Reporting period, the UPF shall report a measurement failure; however, for some QoS monitoring parameters (e.g. congestion information, PDV and data rate), the measurement failure report is not applicable. - Reporting frequency indicating the type of the reporting as "periodic" or "event triggered": - If the Reporting frequency indicates "periodic", the UPF shall send a report each time the reporting period is over. - If the Reporting frequency indicates "event triggered", a Reporting threshold for each parameter in the QoS monitoring parameter(s) and a Minimum waiting time are provided as well. The UPF shall send a report when the measurement result matches or exceeds the indicated Reporting threshold. Subsequent reports shall not be sent by the UPF during the Minimum waiting time. If measurement results are received during the Minimum waiting time, the UPF shall report the minimum and the maximum measurement result when the Minimum waiting time is over. - (Optional) Target of the reporting and Indication of direct event notification indicating that the UPF shall send the reports to a different NF than the SMF (e.g. to the NEF/AF or the NWDAF/DCCF/MFAF). The NF is identified by a Notification Target Address and a Notification Correlation ID. The SMF can also indicate that the UPF shall send the reports to both, the NF indicated by the Target of reporting and to the SMF. If so, the UPF shall send the reports to the SMF as well. If the Indication of direct event notification is not provided, the UPF shall send the reports to the SMF. - (Optional) Reporting suggestion information as defined in clause 5.8.2.17 applicable to Target of the reporting to reduce the UPF performance impacts. - (Optional) Indication of QoS Flow associated with the default QoS Rule (see clause 4.15.4.5.1 of TS 23.502[ Procedures for the 5G System (5GS) ]  [3]). The UPF shall forward this indication, that the QoS monitoring report is for the QoS Flow associated with the default QoS Rule, in the Nupf_EventExposure_Notify service operation when sending reports. The UPF shall send the QoS Monitoring Report as follows: - when the UPF sends reports to the SMF, the UPF shall use QoS Monitoring Reports as described in clause 5.8.5.12; and/or - When the UPF sends reports to a different NF than the SMF (e.g. the NEF/AF or the NWDAF/DCCF/MFAF), the UPF shall use the Nupf_EventExposure_Notify service operation described in clause 5.2.26.2.2 of TS 23.502[ Procedures for the 5G System (5GS) ]  [3].