Trends and challenges in energy-efficient UAV networks

Unmanned Aerial Vehicles (UAVs), e.g., drones, have been the sub-ject of tremendous research and development in recent years. Drones can be augmented with AI, sensors, and communication technologies, enabling them to autonomously interact with the physical world. Coupled with the additional flexibility of controlled maneuverability and falling costs, low-altitude drones are gaining wide popularity to deliver innovative services in the civilian and commercial sectors.