Question: In a Policy and Charging Control (PCC) architecture, how does a Policy and Charging Enforcement Function (PCEF) handle packet excess when enforcing an authorized QoS with a Maximum Bit Rate (MBR) for a service data flow?
Option 1: The PCEF buffers the excess packets to ensure all data is delivered, potentially causing delays.
Option 2: The PCEF reduces the MBR temporarily to accommodate the excess packets without discarding any.
Option 3: The PCEF prioritizes the packets and only discards those with lower priority when the limit is exceeded.
Option 4: The PCEF discards packets exceeding the authorized MBR limit to enforce the defined QoS.
Explanation: This is because, as per the policy enforcement for authorized QoS, the PCEF must limit the data rate of the service data flow not to exceed the maximum authorized bandwidth by discarding packets that exceed this limit. This ensures adherence to the defined QoS parameters, preventing network congestion and maintaining service quality for all users. Discarding excess packets is a common method in telecommunications for enforcing rate limits and preventing network overload.