Question: In a 5G System (5GS), how does the Converged Charging Function (CEF) obtain performance and analytics information for network slice charging?
Option 1: Through direct queries to the Radio Access Network (RAN) nodes.
Option 2: By interacting with the Policy Control Function (PCF) using a proprietary interface.
Option 3: Via periodic reports from the User Equipment (UE).
Option 4: By exchanging Subscribe/Notify messages with the Network Data Analytics Function (NWDAF) and/or Management System (MnS) producers.
Explanation: In a 5G System, the CEF collects performance and analytics data by interacting with NWDAF and MnS through standardized Subscribe/Notify mechanisms, enabling gathering of charging information per network slice, aligning with the service-based architecture.