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3GPP Documentation

Table of contents

5G Core Network

Common APIs

Architecture

5G System architecture

5G System architecture

PCF/CHF Interfaces

PCF Interfaces

Reference points

Interface Description
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
N5 Reference point between the PCF and an AF
N6 Reference point between the UPF and a Data Network
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 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 OCS
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
N40 Reference point between SMF and the CHF
N50 Reference point between AMF and the CBCF

Services

Producer Consumer Service Standard API
PCF AF Npcf_PolicyAuthorization TS 29.514 PCF Policy Authorization Service
SMF Npcf_SMPolicyControl TS 29.512 Session Management Policy Control Service
AMF Npcf_AMPolicyControl TS 29.507 Access and Mobility Policy Control Service
NEF Npcf_EventExposure TS 29.523 PCF Event Exposure Service
Npcf_BDTPolicyControl TS 29.554 PCF BDT Policy Control Service
NWDAF PCF Nnwdaf_EventsSubscription TS 29.520 Nnwdaf_EventsSubscription Service API
Nnwdaf_AnalyticsInfo TS 29.520 Nnwdaf_AnalyticsInfo Service API
CHF PCF Nchf_SpendingLimitControl TS 29.594 Spending Limit Control
NF Nchf_ConvergedCharging TS 32.291 Converged Charging
NF Nchf_OfflineOnlyCharging TS 32.291 Offline Only Charging
UDR PCF Nudr_DataRepository TS 29.504 Unified Data Repository Service
BSF PCF, NEF, AF Nbsf_Management TS 29.521 Binding Support Management Service API
NRF ALL NF Nnrf_NFManagement TS 29.510 NRF NFManagement Service
Nnrf_NFDiscovery TS 29.510 NRF NFDiscovery Service
Nnrf_AccessToken TS 29.510 NRF OAuth2 Authorization

Network Functions and entities

AMF (Access and Mobility Management Function)

APIs

AUSF (Authentication Server Function)

APIs

BSF (Binding Support Function)

CHF (Charging Function)

NEF (Network Exposure Function)

APIs

NRF (NF Repository Function)

NWDAF (Network Data Analytics Function)

PCF (Policy Control Function)

SMF (Session Management Function)

APIs

UDR (Unified Data Repository)

APIs

Policy and Charging Control

OCS (Online Charging System)

Interface Standard
Sy TS 29.219 - Policy and charging control: Spending limit reporting over Sy reference point
Ro - Gy TS 32.251 - Telecommunication management;Charging management;Packet Switched (PS) domain charging
Ro / Rf TS 32.299 - Diameter charging applications

PCRF (Policy and Charging Rule Function)

Interface Standard
Gx TS 29.212 - Policy and Charging Control (PCC); Reference points
Rx TS 29.214 - Policy and charging control over Rx reference point
Sy TS 29.219 - Policy and charging control: Spending limit reporting over Sy reference point

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