Question: In a UE-only Bearer Control Mode (BCM), when the PCRF receives a trigger for removing all PCC rules bound to an IP-CAN bearer from the AF, what action should the PCRF take to avoid race conditions before potentially terminating the bearer?
Option 1: Immediately remove/deactivate all PCC rules for that IP-CAN bearer.
Option 2: Start a timer to wait for a UE-initiated termination message before taking further action.
Option 3: Request the UE to confirm the termination of the IP-CAN bearer.
Option 4: Notify the AF of the intention to terminate the IP-CAN bearer.
Explanation: To avoid race conditions, especially in scenarios where the UE might independently initiate the termination of an IP-CAN bearer, the PCRF should start a timer. This brief waiting period allows for the potential receipt of a UE-initiated termination message, thereby preventing unnecessary network-initiated termination actions if the UE has already begun the process. This approach ensures synchronization and prevents conflicts between UE and network-initiated procedures.