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NR Network Architecture / Network Interface

 

Following is the overal NR Network illustrated based on 23.501. The diagram is based mainly on Figure 4.2.3-1 and Figure 4.2.3-2 of 23.501.

 

The numbers in the oval shape indicates the reference point between components. This shows NR network only in non-roaming condition. In the condition of roaming with other NR network or Legacy network, some additional function block and interface(reference point) is required.

 

 

 

 

Followings are the name of each network component.

    AMF     Access and Mobility Management Function ==> Equivalent to MME in 4G

    AUSF    Authentication Server Function

    DN       Data Network

    NEF      Network Exposure Function

    NRF      Network Repository Function

    NSSF    Network Slice Selection Function

    PCF      Policy Control Function ==> Equivalent to PCRF in 5G

    (R)AN   (Radio) Access Network

    SMF     Session Management Function

    UDM     Unified Data Management ==> Equivalent to HSS in 4G

    UPF      User Plane Function ==> Equivalent to PGW in 4G

    SMSF   SMS Function

 

 

Followings are the reference point definition specified in 23.501 - 4.2.7

    N1: Reference point between the UE and the AMF.

    N2: Reference point between the (R)AN and the AMF.

    N3: Reference point between the (R)AN and the UPF.

    N4: Reference point between the SMF and the UPF.

    N6: Reference point between the UPF and a Data Network.

    N9: Reference point between two UPFs.

    N5: Reference point between the PCF and an AF.

    N7: Reference point between the SMF and the PCF.

    N8: Reference point between the UDM and the AMF.

    N10: Reference point between the UDM and the SMF.

    N11: Reference point between the AMF and the SMF.

    N12: Reference point between AMF and AUSF.

    N13: Reference point between the UDM and Authentication Server function the AUSF.

    N14: Reference point between two AMFs.

    N15: Reference point between the PCF and the AMF in the case of non-roaming scenario, PCF in the visited network and AMF in the case of roaming scenario.

    N16: Reference point between two SMFs, (in roaming case between SMF in the visited network and the SMF in the home network).

    N16a: Reference point between SMF and I-SMF.

    N17: Reference point between AMF and 5G-EIR.

    N18: Reference point between any NF and UDSF.

    N19: Reference point between two PSA UPFs for 5G LAN-type service.

    N22: Reference point between AMF and NSSF.

    N23: Reference point between PCF and NWDAF.

    N24: Reference point between the PCF in the visited network and the PCF in the home network.

    N27: Reference point between NRF in the visited network and the NRF in the home network.

    N28: Reference point between PCF and CHF.

    N29: Reference point between NEF and SMF.

    N30: Reference point between PCF and NEF.

    N31: Reference point between the NSSF in the visited network and the NSSF in the home network.

    N32: Reference point between SEPP in the visited network and the SEPP in the home network.

    N33: Reference point between NEF and AF.

    N34: Reference point between NSSF and NWDAF.

    N35: Reference point between UDM and UDR.

    N36: Reference point between PCF and UDR.

    N37: Reference point between NEF and UDR.

    N38: Reference point between I-SMFs.

    N40: Reference point between SMF and the CHF.

    N50: Reference point between AMF and the CBCF.

    N51: Reference point between AMF and NEF.

    N52: Reference point between NEF and UDM.

    N55: Reference point between AMF and the UCMF.

    N56: Reference point between NEF and the UCMF.

    N57: Reference point between AF and the UCMF.

    N41: Reference point between AMF and the CHF in HPLMN.

    N42: Reference

    N58: Reference point between AMF and the NSSAAF.

    N59: Reference point between UDM and the NSSAAF.

 

 

 

Reference