4.2.2 Network Functions and entities

23.5013GPPRelease 18System architecture for the 5G System (5GS)TS

The 5G System architecture consists of the following network functions (NF):

– Authentication Server Function (AUSF).

– Access and Mobility Management Function (AMF).

– Data Network (DN), e.g. operator services, Internet access or 3rd party services.

– Unstructured Data Storage Function (UDSF).

– Network Exposure Function (NEF).

– Network Repository Function (NRF).

– Network Slice Admission Control Function (NSACF).

– Network Slice-specific and SNPN Authentication and Authorization Function (NSSAAF).

– Network Slice Selection Function (NSSF).

– Policy Control Function (PCF).

– Session Management Function (SMF).

– Unified Data Management (UDM).

– Unified Data Repository (UDR).

– User Plane Function (UPF).

– UE radio Capability Management Function (UCMF).

– Application Function (AF).

– User Equipment (UE).

– (Radio) Access Network ((R)AN).

– 5G-Equipment Identity Register (5G-EIR).

– Network Data Analytics Function (NWDAF).

– CHarging Function (CHF).

– Time Sensitive Networking AF (TSN AF).

– Time Sensitive Communication and Time Synchronization Function (TSCTSF).

– Data Collection Coordination Function (DCCF).

– Analytics Data Repository Function (ADRF).

– Messaging Framework Adaptor Function (MFAF).

– Non-Seamless WLAN Offload Function (NSWOF).

NOTE: The functionalities provided by DCCF and/or ADRF can also be hosted by an NWDAF.

– Edge Application Server Discovery Function (EASDF).

The 5G System architecture also comprises the following network entities:

– Service Communication Proxy (SCP).

– Security Edge Protection Proxy (SEPP).

The functional descriptions of these Network Functions and entities are specified in clause 6.

– Non-3GPP InterWorking Function (N3IWF).

– Trusted Non-3GPP Gateway Function (TNGF).

– Wireline Access Gateway Function (W-AGF).

– Trusted WLAN Interworking Function (TWIF).