Question: What is the primary protocol baseline for the NG user plane (NG-U) interface between the gNodeB (gNB) and User Plane Function (UPF), which facilitates non-guaranteed delivery of user plane PDUs?
Option 1: GTP-U (GPRS Tunneling Protocol - User Plane)
Option 2: SCTP (Stream Control Transmission Protocol)
Option 3: HTTP/2 (Hypertext Transfer Protocol version 2)
Option 4: TCP/IP (Transmission Control Protocol/Internet Protocol)
Explanation: In the context of 5G networks, the NG-U interface between the gNB and UPF relies on GTP-U as its baseline protocol for transmitting user plane data. GTP-U is optimized for efficient, non-guaranteed delivery of user plane PDUs, making it suitable for this interface.