Question: In a Policy and Charging Control (PCC) architecture, when a PCRF receives a QoS rule failure report with an 'INACTIVE' PCC-Rule-Status from the BPCF, what action does the PCRF initiate towards the HNB GW?
Option 1: Send a CCR to request additional credits for the failed QoS rule.
Option 2: Initiate an S15 session termination to completely release all resources associated with the BPCF.
Option 3: Include a CS-Service-Resource-Report AVP in a RAR command but set the CS-Service-Resource-Result-Operation AVP to 'ACTIVATION'.
Option 4: Initiate an S15 session modification with a RAR command, including a CS-Service-Resource-Report AVP with the CS-Service-Resource-Result-Operation AVP set to 'DELETION'.
Explanation: When the PCRF receives a QoS rule failure report indicating an 'INACTIVE' status from the BPCF, it needs to release the allocated resources. To achieve this efficiently without terminating the entire session unnecessarily, the PCRF initiates an S15 session modification. This modification includes specific instructions for resource deletion and provides identifiers for the failed QoS rule and the reason for resource release, ensuring targeted resource management in the 3GPP network.