Network Functions and entities
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).
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