3GPP Interfaces
Comprehensive guide to 3GPP network interfaces and reference points that enable communication between different network elements in mobile networks.
5G Interfaces
Interface between UE and AMF
Purpose
Registration, authentication, session management
Interface between gNB and AMF
Purpose
Control plane signaling, mobility management
Interface between gNB and UPF
Purpose
User plane data transport
Interface between SMF and UPF
Purpose
Session establishment and modification
Interface between UPF and Data Network
Purpose
Data connectivity to external networks
4G Interfaces
Interface between eNB and MME
Purpose
Control plane signaling
Interface between eNB and S-GW
Purpose
User plane data transport
Interface between MME and S-GW
Purpose
Session management and mobility
Control Plane
Interfaces carrying signaling and control information for network management, mobility, and session control.
User Plane
Interfaces carrying actual user data traffic between network elements and external data networks.
Management
Interfaces for network function management, policy control, and service orchestration.