Supported Interfaces
This section describes the interfaces supported between the SMF and other network functions in the 5GC.
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Diameter—Interface that provides framework for services that require Access, Authorization, and Accounting (AAA) or Policy support across IP-based networks.
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GTP—Uses the N9 interface as the reference point between two core UPFs.
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Gx—Interface between SMF and PCRF.
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Gy—Interface between SMF CTF and OCS Charging Data Function (CDF).
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N1/NAS—Reference point between the UE and AMF.
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N2/NGAP—Reference point between the RAN and AMF.
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N4—Reference point between the SMF and UPF.
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N7—Reference point between the SMF and PCF.
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N10—Reference point between the UDM and SMF.
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N11—Reference point between the AMF and SMF.
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N40—Reference point between the SMF and CHF.
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Nnrf—Interface displayed by NRF on 3GPP 5G system architecture.
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RADIUS—Interface that manages network access.
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S2b—Interface between the PGW-C and ePDG.
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S5—Interface between the PGW-C and S-GW.
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SBA—Interface for NFs to communicate with each other.
For details on the supported interfaces, see the Interfaces Support chapter.