Question: In a 3GPP-compliant telecom network, how does the Policy and Charging Rules Function (PCRF) obtain information about a subscriber's spending for dynamic policy decisions?
Option 1: The PCRF directly queries the User Equipment (UE) for spending updates.
Option 2: The PCRF receives spending information through periodic reports from the Serving Gateway (S-GW).
Option 3: The PCRF requests and receives spending limit reports from the Online Charging System (OCS) via subscriptions.
Option 4: Spending data is pushed to the PCRF by the Home Subscriber Server (HSS) during subscriber profile updates.
Explanation: In a 3GPP-compliant telecom network, the PCRF relies on the OCS for charging-related information. For dynamic policy decisions based on subscriber spending, the PCRF would logically interact with the OCS, which maintains and updates spending records. Subscribing to spending limit reports from the OCS is the mechanism that aligns with the network's architecture for real-time or near-real-time policy adjustments, reflecting the operator's defined spending representations.