  The paper considers the characteristics of the energy budget for mobile base
stations (BSs) in the form of Unmanned Aerial Vehicles (UAVs) equipped with
Radio Frequency (RF) transceivers, Intelligent Reconfigurable Surfaces (IRSs),
and Renewable Energy Sources (RESs). The obtained results highlight the
benefits and challenges related to using the aforementioned mobile base
stations from the energy side. The research cases took into account two types
of UAV devices - multirotor and fixed-wing (airplane-like).
