Question: In a WiMAX IP-CAN, what is the primary purpose of constructing PCC rules by the PCRF based on session information from the AF via the Rx reference point?
Option 1: To manage UE registration and authentication processes in the WiMAX network.
Option 2: To optimize DiffServ configurations for air interface efficiency.
Option 3: To determine and enforce QoS requirements for each service on WiMAX service flows.
Option 4: To select appropriate ASN-GW for UE's data path establishment.
Explanation: The correct answer is Option 3 because, as described in the context of WiMAX IP-CAN architecture, the PCRF (Policy and Charging Rules Function) utilizes session information from the AF (Application Function) to construct PCC (Policy and Charging Control) rules. These rules are specifically designed to determine the Quality of Service (QoS) requirements for each service, which are then enforced on the WiMAX service flows to ensure that the data path between the UE (User Equipment) and the WiMAX CSN (Connectivity Service Network) via the ASN (Access Service Network) meets the required service quality standards. This process is crucial for managing network resources and ensuring a satisfactory user experience across various services with different QoS needs.