Glossary
========

Protocols
---------
- NGAP: NG Application Protocol used over N2 interface
- S1AP: S1 Application Protocol used over S1-AP interface
- Diameter: S6a
- NAS: Non-Access-Stratum used between UE & MME/AMF.
- PFCP: Packet Forwarding Control Protocol
- GTPv1
- GTPv2

Network Functions
-----------------

- AMF: Access and Mobility Management Function
- UPF: User Plane Function
- SMF: Session Management Function
- NRF: Network Repository Function
- NSSF: Network Slice Selection Function
- PCF: Policy & Charging Function
- AUSF: Authentication Server Function
- UDM: Unified Data Management
- UDR: Unified Data Repository
- CHF: Charging Function
- NWDAF: Network Data Analytics Function
- NEF: Network Exposure Function
- MME:  Mobility Management Entity
- SGW: Serving Gateway
- PGW: PDN Gateway
- HSS: Home Subscriber Server
- PCRF: Policy and Charging Rule Function

3gpp Interfaces
---------------
- N2: gNodeB to AMF interface
- N4: SMF to UPF interface
- SBI interface
- S1AP: eNodeB to MME interface

Misc
----
SA: Standalone Architecture