Uncrewed Aerial Vehicle

Description

In 3GPP standards, an Uncrewed Aerial Vehicle (UAV) refers not only to the physical aircraft but also to its integration as a User Equipment (UE) within the cellular network. This integration enables UAVs to use 3GPP networks for Command and Control (C2) communication, tracking, and payload data links. The 3GPP system provides the connectivity infrastructure, requiring enhancements to support UAV-specific requirements such as altitude-based service, mobility, identification, and security.

Architecturally, a UAV connects to the network like any other UE, but it is associated with additional network functions and external systems. Key network entities involved include the Access and Mobility Management Function (AMF) for registration and mobility, the Session Management Function (SMF) for PDU session handling, and the Network Exposure Function (NEF) for exposing network capabilities to external UAS Service Suppliers (USS) or UAS Traffic Management (UTM). The UAV's subscription and authorization are managed by the Unified Data Management (UDM). The UAV itself may have specific capabilities, such as reporting its 3D location (latitude, longitude, altitude) and UAV identity, which are communicated to the network via the Control Plane or User Plane.

How it works: A UAV, equipped with a 3GPP modem, attaches to the network. During registration, it may indicate its UAV capabilities. The network can then apply specific policies, such as restricting service to certain geographical zones (geo-fencing) or prioritizing its C2 traffic. For tracking, the network can provide location services (e.g., via LTE Positioning Protocol or 5G NR positioning) to authorized external entities (like a UASS) upon subscription. The UAV's C2 communication typically uses a dedicated PDU session with guaranteed QoS (low latency, high reliability). The network interfaces with UTM systems to exchange flight authorization, telemetry, and traffic management information, creating a cohesive ecosystem for safe UAV operations.

Purpose & Motivation

The standardization of UAV support in 3GPP addresses the critical need for a reliable, wide-area, and secure communication network for drones, particularly for Beyond Visual Line of Sight (BVLOS) operations. Traditional drone communication relied on direct radio links (e.g., Wi-Fi, proprietary C2) with limited range and lack of seamless mobility, hindering scalable commercial applications. Cellular networks offer ubiquitous coverage, high reliability, security, and advanced features like network slicing.

Initiated in Release 14 as a study item, the work was motivated by the rapid growth of the drone industry and regulatory pushes for UAS Traffic Management (UTM). 3GPP networks solve the limitations of previous approaches by providing a managed, QoS-aware infrastructure. This enables diverse applications like aerial delivery, surveillance, and inspection. The evolution through subsequent releases has continuously enhanced support, adding features like UAV identification, altitude reporting, interference mitigation with terrestrial users, and direct UAV-to-network and UAV-to-UAV communication, positioning cellular technology as a foundational enabler for the future of autonomous aerial systems.