Question: When a Policy and Charging Rules Function (PCRF) receives a CCR with a QoS-Information AVP requesting a Quality of Service (QoS) higher than the authorized QoS for a service data flow, how does the PCRF handle the IP CAN QoS?
Option 1: The PCRF upgrades the IP CAN QoS to match the requested QoS in the QoS-Rule-Definition AVP sent to the BBERF (Broadband Access Gateway/Broadband Policy Control Function).
Option 2: The PCRF authorizes only the requested QoS by supplying it in the QoS-Information AVP within the QoS-Rule-Definition AVP to the BBERF, without considering the authorized QoS.
Option 3: The PCRF may choose to either upgrade or downgrade the IP CAN QoS based on additional service-specific criteria before responding to the BBERF.
Option 4: The PCRF downgrades the IP CAN QoS by supplying the authorized QoS in the QoS-Information AVP within the QoS-Rule-Definition AVP to the BBERF.
Explanation: According to telecom principles for Policy and Charging Control (PCC), when the requested Quality of Service (QoS) exceeds the authorized QoS, the PCRF must ensure that the service does not consume more resources than allocated. Thus, it downgrades the IP CAN QoS to match the authorized level, preventing over-provisioning and maintaining network resource integrity. This action is crucial for managing network capacity and enforcing policy decisions in real-time.