Section: 5.37.7 5GS Packet Delay Variation monitoring and reporting 5.37.7.1 General
Content: The 5GS Packet Delay Variation is the variation of packet delay measured between UE and PSA UPF. The AF may send the requirement for Packet Delay Variation monitoring to 5GS together with the requirement for packet delay measurement, 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]. Upon AF request for Packet Delay Variation monitoring together with packet delay monitoring, the PCF triggers the QoS monitoring procedure, and gets the UL, DL or RT QoS Monitoring result from the SMF. The PCF derives the 5GS Packet Delay Variation based on the QoS Monitoring result and then reports to the AF/NEF both packet delay measurements and Packet Delay Variation. NOTE: The derivation of 5GS Packet Delay Variation by PCF, based on QoS Monitoring, is implementation dependent. The Packet Delay Variation calculation method needs to be the same within the PLMN, based on operator policy. QoS Monitoring is used to obtain measurement of QoS parameters of individual QoS Flows. PCF determines the measurements required based on input from AF and enables the measurements by generating an authorized QoS Monitoring Policy for the PCC Rule as specified in clause 6.1.3.21 of TS 23.503[ Policy and charging control framework for the 5G System (5GS); Stage 2 ]  [45].