Question: In a separated Control and User Plane architecture for EPC nodes, as per 3GPP standards, which reference point denotes the interface between the Control Plane (TDF-C) and User Plane (TDF-U) of a Traffic Detection Function (TDF)?
Option 1: Sxc
Option 2: Sxa
Option 3: Sxb
Option 4: Gx
Explanation: In the context of Control and User Plane Separation (CUPS) for EPC nodes, specific reference points are defined to facilitate communication between the separated planes of different network functions. For the Traffic Detection Function (TDF), the reference point Sxc is designated for interactions between its Control Plane (TDF-C) and User Plane (TDF-U). This separation enables more flexible and efficient network architecture designs, particularly beneficial in managing traffic detection and policy enforcement in modern telecommunications networks.