Question: In the context of the S15 interface, what is the role of the PCRF and HNB GW in relation to the Diameter protocol?
Option 1: PCRF: Diameter Client, HNB GW: Diameter Server
Option 2: PCRF: Diameter Server, HNB GW: Diameter Client
Option 3: Both PCRF and HNB GW act as Diameter Peers
Option 4: The roles are dynamically assigned based on the Application-ID
Explanation: According to protocol support definition, the Policy and Charging Rules Function (PCRF) acts as a Diameter server, providing policy decisions and charging rules. Conversely, the Home NodeB Gateway (HNB GW) acts as the Diameter client, requesting and receiving these policies from the PCRF, crucial for managing network resources and subscriber sessions efficiently in telecom networks.