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5G NR: Interfaces available in 5G NR – Xn, NG, E1, F1, F2, CPRI

prodevelopertutorial September 10, 2022

5G NR: Interfaces available in 5G NR - Xn, NG, E1, F1, F2, CPRI

Above image shows overall architecture from 3GPP TS 38.300 specification.

Xn interface exists between 2 base stations.

Xn-U stands for Xn User Plane

Xn-C stands for Xn Control Plane

NG interface is between 5GC and base station.

5G NR Xn Interface

Xn interface is between 2 or more NG-RAN

Functions of Xn-C
Xn Setup function
Error Indication function
Xn reset function
Xn configuration data update function

UE mobility management functions
Handover preparation function
Handover cancellation function
Retrieve UE Context function
RAN Paging function
Data Forwarding control function

Functions of Xn-U
Data transfer function
Flow control function
Assistance information function
Fast retransmission function

 

TS 38.420

5G NR NG Interface

5G NR NG interface is between 5G RAN and 5G Core Network.

There are 2 interfaces in NG i.e NG-C, NG-U.

Functions of the NG interface

> Paging function

> UE Context Management function

> Mobility Management function

> PDU Session Management function

> Trace function

NG interface capabilities

> procedures to establish, maintain and release NG-RAN part of PDU sessions;

>procedures to perform intra-RA T handover and inter-RA T handover;

> the transfer of NAS signalling messages between UE and AMF;

> mechanisms for resource reservation for packet data streams.

TS 38.410

5G NR E1 Interface

E1 interface is between gNB-CU-CP and gNB-CU-UP.

Functions of the E1 interface

> E1 interface management function

> E1 bearer context management function

> Trace function

TS 38.460

5G NR F1 Interface

F1 interface is between gNB-CU and gNB-DU.

TS 38.470

5G NR F2 Interface

F2 interface is between upper and lower part of PHY layer.

CPRI

CPRI: Common Public Radio Interface.

CPRI is between the Radio Equipment Controllers and Radio Equipment.

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