5.8.2.18 QoS Flow related QoS monitoring and reporting

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;

NOTE 1: Clause 5.45 contains specific description about the UPF configuration for QoS monitoring for the respective QoS monitoring parameter.

• 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, available bitrate), 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 should not be sent by the UPF during the Minimum waiting time. The UPF shall continue to report a measurement result that matches or exceeds the indicated Reporting Threshold when the Minimum waiting time is over.

NOTE 2: As an implementation option, the UPF can be configured to send subsequent report(s) during the Minimum waiting time, e.g. if the UPF determines that this report is considerably different from the previous report.

• (Optional) Target of reporting 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, by providing the Duplicated notification information (as defined in TS 29.244 [65]). If so, the UPF shall send the reports to the SMF as well. If the Target of reporting is not provided, the UPF shall send the reports to the SMF.

NOTE 3: The SMF provides the Target of reporting if it has received Target of reporting and Indication of direct event notification in the QoS Monitoring policy of the PCC rule (see clause 6.1.3.21 of TS 23.503 [45]).

• (Optional) Reporting suggestion information as defined in clause 5.8.2.17 applicable to Target of reporting to reduce the UPF performance impacts. The SMF includes Reporting Suggestion information if received in a subscription to UPF QoS Monitoring event sent by the consumer via SMF for UPF Data Collection (see clause 4.15.4.5 of TS 23.502 [3]).
• (Optional) Indication of QoS Flow associated with the default QoS Rule (see clause 4.15.4.5.1 of TS 23.502 [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.
• (Optional) Remaining data reporting indication. The SMF includes this indication if received in a subscription to UPF QoS Monitoring event sent by the consumer via SMF for UPF Data Collection (see clause 4.15.4.5). It indicates that the consumer requests that, at N4 session release, UPF reports any collected data not yet sent. UPF may send any collected data not yet sent to the UPF event consumer considering the Remaining data reporting indication and/or local configuration as described in clause 4.15.4.5.6 of TS 23.502 [3].

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 [3].