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5G Interfaces: Uu, NG-1U, and NG-1C Explained

5g interface ran network architecture radio access network

This page describes the key 5G interfaces: Uu, NG-1U, and NG-1C. It details their functions within the 5G network architecture.

5G RAN Architecture with 5G interfaces

Figure 1: 5G RAN (Radio Access Network) Architecture with 5G Interfaces

The figure above illustrates the 5G RAN architecture and highlights the various 5G interfaces. The table below outlines the function of each interface.

5G Interface Descriptions

5G InterfaceDescription
Uu interfaceAs shown in the figure, this interface exists between the 5G UE (User Equipment) and the 5G-RAN. It’s often referred to as the air interface.
NG-1U interfaceThis interface connects the 5G-RAN to the 5G User Plane, handling user data.
NG-1C interfaceThis interface connects the 5G-RAN to the 5G Core Control, responsible for control plane functions.

Reference: TS V5G.300 5G NR network interfaces

5G NR gNB interfaces

5G NR gNB interfaces