Question: Upon activating a Priority EPS Bearer Service, what actions may the Policy and Charging Rules Function (PCRF) take regarding the Quality of Service (QoS) Class Identifier (QCI) of existing PCC/QoS Rules?
Option 1: Modify the QCI of all existing PCC/QoS Rules to match the new Priority EPS Bearer Service's QCI, if required.
Option 2: Leave the QCI of all existing PCC/QoS Rules unchanged to avoid service disruption.
Option 3: Randomly select existing PCC/QoS Rules for QCI modification to balance resource allocation.
Option 4: Only modify the QCI for new PCC/QoS Rules created after the Priority EPS Bearer Service activation.
Explanation: Upon activating a Priority EPS Bearer Service, the PCRF ensures all affected network elements are aligned with the new service's requirements. This includes modifying the QCI of existing PCC/QoS Rules if necessary, to maintain consistent prioritization and quality of service across all traffic on the same bearer, as per the service's specifications.