A user plane function receives, from a session management function, a request for at least one quality of service (QoS) report for a data flow, the request indicating: a QoS event; and a first QoS value for the QoS event. Monitoring packets for monitoring a second QoS value of the data flow are sent to a base station. A determination is made of an occurrence of the QoS event based on the second QoS value and the first QoS value. An indication of the occurrence is sent to the session management function.