5G Network Function Reference Points

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Reference Point	Interfaces
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.
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.
N9	Reference point between two UPFs.
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).
N17	Reference point between AMF and 5G-EIR.
N18	Reference point between any NF and UDSF.
N22	Reference point between AMF and NSSF.
N23	Reference point between PCF and NWDAF.
N24	Reference point between NSSF 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.
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.
N40	Reference point between SMF and the CHF.
N50	Reference point between AMF and the CBCF.