3GPP Glossary

Access and Mobility Management Function

The 5GC control-plane function handling registration, connection and mobility management, and NAS signaling termination for the UE.

Mobility Management Entity

The EPC control-plane node handling NAS signaling, idle-mode UE tracking, bearer activation/deactivation, and authentication for LTE.

Network Exposure Function

The 5GC function that securely exposes network capabilities and events to external third-party applications.

Network Repository Function

The 5GC function that provides service discovery, allowing network functions to register and discover each other over the service-based interface.

Policy Control Function

The 5GC function that provides policy rules for QoS, charging, and traffic steering to the SMF and other network functions.

Session Management Function

The 5GC function responsible for PDU session establishment, IP address allocation, and UPF selection and control.

Unified Data Management

The 5GC function that stores subscriber subscription data and generates authentication credentials, exposed via the UDR.

User Plane Function

The 5GC user-plane node that performs packet routing, forwarding, QoS enforcement, and traffic reporting, with control via PFCP from the SMF.