Question: In a PCC architecture, when the TDF detects an application and marks it with a specific DSCP value for downlink QoS control, what action(s) can the PCRF take to support this QoS control?
Option 1: Only deactivate all pre-defined QoS rules to prevent conflicts.
Option 2: Either install a corresponding dynamic QoS Rule or activate a pre-defined QoS rule based on the DSCP value.
Option 3: Always install a new static QoS Rule overriding existing rules for the specific application.
Option 4: Ignore the DSCP marking and rely solely on existing QoS rules.
Explanation: This is because, to effectively support QoS control in the downlink direction initiated by the TDF's application detection and DSCP marking, the PCRF needs to align its policy enforcement with these markings. By either installing a dynamic rule that matches the specific DSCP value or activating a pre-configured rule designed for such scenarios, the PCRF ensures seamless QoS control coordination between the TDF and the BBERF, especially crucial in downlink direction procedures.