Question: When a PCRF (Policy and Charging Rules Function) modifies the Authorized Default EPS (Evolved Packet System) Bearer QoS, what additional action must it simultaneously take regarding existing QoS Rules?
Option 1: Modify only the ARP (Allocation and Retention Priority) of all affected QoS Rules.
Option 2: Modify only the QCI (QoS Class Identifier) of all affected QoS Rules.
Option 3: Leave all existing QoS Rules unchanged to avoid service disruption.
Option 4: Simultaneously modify both the QCI and ARP of all QoS Rules that should have the same QoS as the default bearer, based on operator policy.
Explanation: When the PCRF changes the Authorized Default EPS Bearer QoS, it must ensure consistency across all impacted QoS Rules by adjusting both the QCI (determining service priority and handling) and ARP (influencing resource allocation decisions) for all relevant rules, maintaining aligned QoS settings as per operator-defined policies to ensure seamless network behavior.