Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Efficient 3D Placement of a UAV Using Particle Swarm Optimization   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.

8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
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The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat