Question: When forwarding user plane data from the Control Plane (CP) Function to the User Plane (UP) Function over PFCP-u, how is the GTP-U header set for traffic destined towards SGi or N6?
Option 1: The GTP-U header is set to the IP address and TEID uniquely assigned in the UP function for the PFCP-u tunnel.
Option 2: The GTP-U header is set to the F-TEID assigned by the downstream GTP-U peer (e.g., SGW, I-UPF) without an outer GTP-U header.
Option 3: The GTP-U header is set with a randomly generated TEID and the IP address of the CP function.
Option 4: No GTP-U encapsulation is required for traffic towards SGi or N6.
Explanation: According to the specified forwarding rules, for user plane data destined towards SGi or N6, the GTP-U header must be set with the IP address and TEID that are uniquely assigned in the UP function for the PFCP-u tunnel. This ensures proper routing and handling of the traffic within the network, highlighting the importance of correct header setup in telecom networks for efficient data transfer.