The Authentication Server Function (AUSF) provides subscriber authentication, normally based on SIM. AUSF Supports:
- Authentication request from access network
- Interaction from UDM for auth generate: 5G AKA only (see AKMA Procedure)
- Storage of Kausf until removed by AMF or replaced
Handles routing based on SUCI and SUPI
Manages authentication confirmation timeout
Supports re-synchronization procedure
Maintains session states in an external centralized database for stateless operations
AKMA Procedures
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