RF5G Network Reference Point Architecture: NG1 to NG15 Interfaces
5g
network architecture
5g nr
reference point
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This page describes the 5G network reference point architecture, outlining the various reference points or interfaces (NG1, NG2, NG3, NG4, NG5, NG6, NG7, NG8, NG9, NG10, NG11, NG12, NG13, NG14, NG15) used between the functional blocks of a 5G NR network.
Introduction
“5G” stands for the 5th generation of wireless technology. It follows the 3GPP roadmap, from which LTE (i.e., 4th generation wireless technology) and LTE-Advanced have been developed.
- Figure 1 depicts the 5G NR overall architecture, as defined in the 3GPP TS 38.300 specification.
- A
gNBnode provides NR user plane and control plane protocol terminations towards the UE and is connected via the NG interface to the 5GC. - An
ng-eNBnode provides E-UTRA user plane and control plane protocol terminations towards the UE and is connected via the NG interface to the 5GC.
5G NG1 to NG15 Interfaces | 5G NG1 to NG15 Reference Points
Figure 2 depicts the 5G reference point architecture.
The following table describes the functions of the 5G NG1 to NG15 Reference Points or interfaces:
| 5G reference points or 5G interfaces | Function description |
|---|---|
| NG1 | Between UE and AMF (Access and Mobility Management Function) |
| NG2 | Between RAN (Radio Access Network) or gNB (i.e., 5G base station) and AMF |
| NG3 | Between RAN or gNB (i.e., 5G base station) and UPF (User Plane Function) |
| NG4 | Between SMF (Session Management Function) and UPF |
| NG5 | Between PCF (Policy Control Function) and AF (Application Function). |
| NG6 | Between UPF and DN (Data Network) |
| NG7 | NG7 is a reference point between SMF and PCF. NG7r is a reference point between vPCF and hPCF. |
| NG8 | Between Unified Data Management (UDM) and AMF |
| NG9 | Between two core UPFs |
| NG10 | Reference point between UDM and SMF |
| NG11 | Between SMF and SMF |
| NG12 | Between AMF and AUSF (Authentication Server Function) |
| NG13 | Between UDM and AUSF |
| NG14 | Between two AMFs |
| NG15 | • Between PCF and AMF (in Non-roaming scenario) • Between V-PCF and AMF (in Roaming scenario) |
| NG16 | Between two SMFs (Roaming between V-SMF and H-SMF) |
Reference: 3GPP specification
