Unmanned aerial vehicles (UAVs) can be used as aerial wireless base stations
when cellular networks go down. Prior studies on UAV-based wireless coverage
typically consider an Air-to-Ground path loss model, which assumes that the
users are outdoor and they are located on a 2D plane. In this paper, we propose
using a single UAV to provide wireless coverage for indoor users inside a
high-rise building under disaster situations (such as earthquakes or floods),
when cellular networks are down. We assume that the locations of indoor users
are uniformly distributed in each floor and we propose a particle swarm
optimization algorithm to find an efficient 3D placement of a UAV that
minimizes the total transmit power required to cover the indoor users.Comment: 6 pages, 7 figure