Standards Compliance

The SMF is one of the control plane (CP) NFs of the 5G core network. The SMF uses different interfaces to communicate with the other NFs or nodes. For example, the N4 interface exists between the SMF and User Plane Function (UPF). Each of the SMF interfaces comply to a specific version of the 3GPP specification depending on the compliance version supported.

Use the following table to determine the compliance mapping of each SMF interface and the 3GPP Standards specification versions.

Interface Relationship 3GPP Specification Version

N11

Between AMF and SMF

29.518

29.502

For December 2018 Compliance Support: 15.2.0

For June 2019 Compliance Support: 15.4.0

N7

Between PCF and SMF

29.512

For December 2018 Compliance Support: 15.2.0

For June 2019 Compliance Support: 15.4.0

N4

Between UPF and SMF

29.244

For December 2018 Compliance Support: 15.2.0

For June 2019 Compliance Support: 15.4.0

Nnrf

Between NRF and SMF

29.510

For December 2018 Compliance Support: 15.0.0

For June 2019 Compliance Support: 15.4.0

N10

Between UDM and SMF

29.503

For December 2018 Compliance Support: 15.2.1

For June 2019 Compliance Support: 15.4.0

N40

Between SMF and CHF

32.291

For December 2018 Compliance Support: 15.1.0

For June 2019 Compliance Support: 15.3.0

N1

Between UE and AMF

24.501

For December 2018 Compliance Support: 15.2.0

For June 2019 Compliance Support: 15.4.0

N2/NGAP

Between RAN and AMF

38.413

For December 2018 Compliance Support: 15.2.0

For June 2019 Compliance Support:15.4.0