UAS Application Enabler

Description

The UAS Application Enabler (UAE) is a service capability defined within the 3GPP architecture to support Unmanned Aircraft Systems (UAS), commonly known as drones, using 3GPP networks. It acts as an intermediary layer between UAS Service Suppliers (USS) and the 3GPP core network, translating application-level service requests into network-specific commands and procedures. The UAE framework is primarily realized through the Network Exposure Function (NEF) in the 5G Core (5GC) or the Service Capability Exposure Function (SCEF) in the Evolved Packet Core (EPC), which securely exposes network capabilities to authorized third-party UAS applications.

Architecturally, UAE defines a set of Application Programming Interfaces (APIs) and reference points, such as Nudm, Nnef, and N5g-eir, allowing a USS to interact with the network for critical UAS functions. Key procedures include UAS identification and authentication, where the UAE can query the network to verify a drone's subscription and credentials. It also supports authorization for flight operations by checking policies and no-fly zones, and facilitates the establishment and management of Quality of Service (QoS) for command-and-control (C2) links and payload data streams, ensuring reliable, low-latency connectivity essential for safe drone operation.

Furthermore, UAE enables location and tracking services by exposing network-based or UE-assisted location information of the UAS to the USS for air traffic management. It also supports network slicing, allowing the creation of dedicated logical networks with specific performance characteristics for UAS traffic, isolating it from other mobile broadband services. The UAE's role is crucial for integrating drones into the national airspace system, providing the necessary network-assisted automation, security, and regulatory compliance for scalable commercial and governmental UAS deployments.

Purpose & Motivation

The UAE was created to address the growing need for a standardized, secure, and reliable method to integrate Unmanned Aircraft Systems into controlled airspace using ubiquitous cellular networks. Prior to its specification, drone operations, especially BVLOS, relied on non-standardized, proprietary communication links (like direct radio) which lacked scalability, inherent mobility support, and integration with broader air traffic management systems. This posed significant challenges for safety, security, and regulatory oversight, limiting the commercial potential of drone delivery, surveillance, and inspection services.

The primary motivation for UAE within 3GPP was to leverage existing and future cellular infrastructure—4G LTE and 5G—to provide a unified connectivity solution for UAS. Cellular networks offer wide-area coverage, high reliability, built-in security, and advanced features like mobility management and QoS, which are ideal for supporting drones. The UAE framework solves the problem of how to securely expose these network capabilities to external UAS service providers and regulators, enabling automated flight authorization, real-time tracking, and guaranteed communication performance. Its creation in Release 17 was driven by global regulatory pushes, such as those by the FAA and EASA, for remote identification and tracking of drones, positioning 3GPP technology as a key enabler for the digital transformation of aviation.