5G-EIR (5G-Equipment Identity Register) –
AF (Application Function) –
AMF (Access and Mobility Management Function) –
AUSF (Authentication Server Function) –
DN (Data Network) –
NEF (Network Exposure Function) –
NRF (Network Repository Function) –
NSSF (Network Slice Selection Function) –
PCF (Policy Control Function) –
(R)AN ((Radio) Access Network) –
SMF (Session Management Function) –
UDM (Unified Data Management) –
UDSF (Unstructured Data Storage Function) –
UPF (User Plane Function) –
UDR (Unified Data Repository) –
The present document defines the Stage 2 system architecture for the 5G System. The 5G System provides data connectivity and services.
This specification covers both roaming and non-roaming scenarios in all aspects, including interworking between 5GS and EPS, mobility within 5GS, policy control and charging, and authentication.
contains the stage 2 procedures and flows for 5G System and it is a companion specification to this specification.