Section: 5.45 QoS Monitoring 5.45.1 General
Content: QoS monitoring comprises of measurements of QoS monitoring parameters and reports of the measurement result for a QoS Flow and can be enabled based on 3rd party application requests and/or operator policies configured in the PCF. Event Reporting from PCF is specified in clause 6.1.3.18 of TS 23.503[ Policy and charging control framework for the 5G System (5GS); Stage 2 ]  [45] and User Plane QoS Flow related QoS monitoring and reporting in clause 5.8.2.18. The AF may request measurements for one or more of the following QoS monitoring parameters, which may trigger QoS monitoring for service data flow(s): - UL packet delay, DL packet delay, round trip packet delay for a service data flow, see clause 5.45.2. - Congestion, see clause 5.45.3. - Data Rate, see clause 5.45.4. - Packet Delay Variation, see clause 5.37.7. - Round trip packet delay considering UL on a service data flow and DL of another service data flow, see clause 5.37.4. The following AF requested QoS requirements may trigger QoS monitoring for service data flow(s): - Round-trip latency requirement, see clause 5.37.6. The PCF may generate the authorized QoS Monitoring policy for a service data flow based on the QoS Monitoring request received from the AF (as described in clause 6.1.3.21 of TS 23.503[ Policy and charging control framework for the 5G System (5GS); Stage 2 ]  [45]) or based on PCF local policy or configuration reasons, such as PCF awareness of dynamic satellite backhaul connection. The PCF includes the authorized QoS Monitoring policy in the PCC rule and provides it to the SMF. The QoS monitoring parameter(s) that can be measured by means of QoS monitoring are listed below. The QoS monitoring policy in PCC rule (described in clause 6.3.1 of TS 23.503[ Policy and charging control framework for the 5G System (5GS); Stage 2 ]  [45]) may include the following: - UL packet delay, DL packet delay, round trip packet delay, see clause 5.45.2. - Congestion, see clause 5.45.3. - Data Rate, see clause 5.45.4. The SMF configures the UPF to perform QoS monitoring for the QoS Flow and to report the monitoring results as described in clause 5.8.2.18 with parameters determined by the SMF based on the authorized QoS Monitoring policy received from the PCF or local configuration or both. The SMF may also configure RAN to measure the QoS monitoring parameters by sending QoS monitoring request based on the authorized QoS Monitoring policy received from the PCF and/or local configuration. The QoS monitoring request to the NG RAN for different parameters is as defined in clause 5.45.2 and 5.45.3. The following clauses describe the QoS monitoring parameters which can be measured and any specific actions or constraints for their measurement. NOTE: The QoS monitoring parameter which can be measured are parameters which describe the QoS experienced in the 5GS by the application, i.e. they are not restricted to the 5G QoS Parameters defined in clause 5.7.2.