Dynamic QoS Flow Establishment based on Detected Traffic

To establish a dynamic QoS flow when traffic is detected, UPF uses the Application Detection and Control (ADC) over Gx feature.

On receiving a PCC predefined rule over default 5G QoS Identifier (5QI) for application detection and control, the SMF instructs the UPF to detect application traffic. The UPF installs the Gx ADC PDR with default QFI, and the rule name is considered as Application ID for reporting to the SMF.

On detecting a new flow hitting the Gx ADC predefined rule, the UPF triggers an Application Start event. When the application traffic is identified by an application identifier, the SMF reports the start of application to the PCF.

The PCF then makes policy decisions based on the information received and sends the corresponding updated PCC rules (with QCI-80) to the SMF.