Question: In a Policy and Charging Control (PCC) architecture, if the modification of an active Application Detection and Control (ADC) rule using PUSH mode fails, how does the Traffic Detection Function (TDF) handle the existing ADC rule?
Option 1: The TDF automatically deactivates the existing ADC rule and notifies the Policy and Charging Rules Function (PCRF) via a TSA/RAA command.
Option 2: The TDF modifies the existing ADC rule to a default configuration and reports the failure to the PCRF using a TSA/RAA command.
Option 3: The TDF removes the existing ADC rule and sends a new CCR command to the PCRF for re-installation.
Option 4: The TDF retains the existing ADC rule as active without modification (unless the failure reason impacts the existing rule) and reports the modification failure to the PCRF using a TSA/RAA command.
Explanation: This is because, according to error handling procedures for ADC rules in PCC architectures, if a modification of an active ADC rule (using PUSH mode) fails, the TDF should leave the existing rule unchanged (to maintain continuity of service) unless the failure directly affects the rule's viability. The TDF then communicates this failure to the PCRF, allowing for further action based on the reported Rule-Failure-Code, ensuring minimal disruption to ongoing services while keeping the PCRF informed.