22.1253GPPTSUnmanned Aerial System (UAS) support in 3GPP
For the purposes of the present document, the terms and definitions given in 3GPP TR 21.905  and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in 3GPP TR 21.905 .
Above ground level (AGL): In the context of a UAV it is the UAV altitude referenced to ground level in the vicinity.
Command and Control (C2) Communication: the user plane link to deliver messages with information of command and control for UAV operation from a UAV controller or a UTM to a UAV.
Unmanned Aerial System (UAS): Composed of Unmanned Aerial Vehicle (UAV) and related functionality, including command and control (C2) links between the UAV and the control station, the UAV and the network, and for remote identification. An UAS may comprise of a UAV and a UAV controller.
Unmanned Aerial System Traffic Management (UTM): a set of functions and services for managing a range of autonomous vehicle operations.
UAV controller: The UAV controller of a UAS enables a drone pilot to control an UAV. BVLOS Beyond Visual Line of Sight
UxNB: radio access node on-board UAV. It is a radio access node providing connectivity to UEs, which is carried in the air by an Unmanned Aerial Vehicle (UAV).
For the purposes of the present document, the following symbols apply:
For the purposes of the present document, the abbreviations given in 3GPP TR 21.905  and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in 3GPP TR 21.905 .
BVLOS Beyond Visual Line of Sight
C2 Command and Control
Remote ID Remote Identification 
UAS Unmanned Aerial System
UAV Unmanned Aerial Vehicle
UTM Unmanned Aerial System Traffic Management