5G Tutorial
N3IWF Function
N3IWF Function Description
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Non-3GPP Access
Non-3GPP Access Reference Points
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NRF
AUSF
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Abbreviations
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Reference Points
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Http Mandatory Headers
5G-EIR
AMF Function
AMF Functional Description
AMF Specifications
AMF Services
SMF Function
SMF Functional Description
SMF Specifications
SMF Services
UPF Function
UPF Functional Description
PCF Function
PCF Functional Description
PCF Specifications
NEF Function
NEF Functional Description
NEF Specifications
NRF Function
NRF Functional Description
NRF Specifications
UDM Function
UDM Functional Description
UDM Specifications
AUSF Function
AUSF Functional Description
AUSF Specifications
Application Function
Application Functional Description
UDR Function
UDR Functional Description
UDR Specifications
UDSF Function
UDSF Functional Description
SMSF Function
SMSF Functional Description
SMSF Specifications
NSSF Function
NSSF Functional Description
NSSF Specifications
5G-EIR Function
5G-EIR Functional Description
5G-EIR Specifications
LMF Function
LMF Functional Description
LMF Specifications
SEPP Function
SEPP Functional Description
NWDAF Function
NWDAF Functional Description
NWDAF Specifications
Data Types

Non-3GPP InterWorking Function Functional Description



Below are the Functionalities supported by 5G Non-3GPP InterWorking Function (N3IWF), a single Instance of AUSF may implement some are all Functionalities.

Support of IPsec tunnel establishment with the UE: The N3IWF terminates the IKEv2/IPsec protocols with the UE over NWu and relays over N2 the information needed to authenticate the UE and authorize its access to the 5G Core Network.

Termination of N2 and N3 interfaces to 5G Core Network for control - plane and user-plane respectively.

Relaying uplink and downlink control-plane NAS (N1) signalling between the UE and AMF.

Handling of N2 signalling from SMF (relayed by AMF) related to PDU Sessions and QoS.

Establishment of IPsec Security Association (IPsec SA) to support PDU Session traffic.

Relaying uplink and downlink user-plane packets between the UE and UPF, including De-capsulation/ encapsulation of packets for IPSec and N3 tunnelling.

Enforcing QoS corresponding to N3 packet marking, taking into account QoS requirements associated to such marking received over N2

N3 user-plane packet marking in the uplink

Local mobility anchor within untrusted non-3GPP access networks using MOBIKE

Supporting AMF selection.




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