731 research outputs found
Underlay Drone Cell for Temporary Events: Impact of Drone Height and Aerial Channel Environments
Providing seamless connection to a large number of devices is one of the
biggest challenges for the Internet of Things (IoT) networks. Using a drone as
an aerial base station (ABS) to provide coverage to devices or users on ground
is envisaged as a promising solution for IoT networks. In this paper, we
consider a communication network with an underlay ABS to provide coverage for a
temporary event, such as a sporting event or a concert in a stadium. Using
stochastic geometry, we propose a general analytical framework to compute the
uplink and downlink coverage probabilities for both the aerial and the
terrestrial cellular system. Our framework is valid for any aerial channel
model for which the probabilistic functions of line-of-sight (LOS) and
non-line-of-sight (NLOS) links are specified. The accuracy of the analytical
results is verified by Monte Carlo simulations considering two commonly adopted
aerial channel models. Our results show the non-trivial impact of the different
aerial channel environments (i.e., suburban, urban, dense urban and high-rise
urban) on the uplink and downlink coverage probabilities and provide design
guidelines for best ABS deployment height.Comment: This work is accepted to appear in IEEE Internet of Things Journal
Special Issue on UAV over IoT. Copyright may be transferred without notice,
after which this version may no longer be accessible. arXiv admin note: text
overlap with arXiv:1801.0594
Coverage and Rate Analysis for Unmanned Aerial Vehicle Base Stations with LoS/NLoS Propagation
The use of unmanned aerial vehicle base stations (UAV-BSs) as airborne base
stations has recently gained great attention. In this paper, we model a network
of UAV-BSs as a Poisson point process (PPP) operating at a certain altitude
above the ground users. We adopt an air-to-ground (A2G) channel model that
incorporates line-of-sight (LoS) and non-line-of-sight (NLoS) propagation.
Thus, UAV-BSs can be decomposed into two independent inhomogeneous PPPs. Under
the assumption that NLoS and LoS channels experience Rayleigh and Nakagami-m
fading, respectively, we derive approximations for the coverage probability and
average achievable rate, and show that these approximations match the
simulations with negligible errors. Numerical simulations have shown that the
coverage probability and average achievable rate decrease as the height of the
UAV-BSs increases
Coverage Analysis for Low-Altitude UAV Networks in Urban Environments
Wireless access points on unmanned aerial vehicles (UAVs) are being
considered for mobile service provisioning in commercial networks. To be able
to efficiently use these devices in cellular networks it is necessary to first
have a qualitative and quantitative understanding of how their design
parameters reflect on the service quality experienced by the end user. In this
paper we set up a scenario where a network of UAVs operating at a certain
height above ground provide wireless service within coverage areas shaped by
their directional antennas. We provide an analytical expression for the
coverage probability experienced by a typical user as a function of the UAV
parameters.Comment: Under Submissio
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