Question: In a Policy and Charging Control (PCC) architecture for NS-WLAN offloaded traffic, how can a Policy and Charging Rules Function (PCRF) typically obtain the address of a Traffic Detection Function (TDF)?
Option 1: Through periodic DNS queries within the PCC domain.
Option 2: Via preconfiguration in the PCRF or through IP-CAN session signalling over S9a interface for NS-WLAN offloaded traffic.
Option 3: By sending a specific TDF discovery request to the User Equipment (UE).
Option 4: Automatically, as it is always broadcast by the TDF within the network.
Explanation: In the context of PCC architecture for managing NS-WLAN offloaded traffic, the PCRF needs to know the TDF address for proper traffic handling. This can be achieved through two efficient methods highlighted in Option 2: Preconfiguration and IP-CAN Session Signalling over S9a. Both methods ensure the PCRF can effectively interact with the TDF for traffic management, making Option 2 the most accurate and comprehensive choice.