We consider a cellular network deployment where
UAV-to-UAV (U2U) transmit-receive pairs share the same spectrum
with the uplink (UL) of cellular ground users (GUEs).
For this setup, we focus on analyzing and comparing the
performance of two spectrum sharing mechanisms: (i) underlay,
where the same time-frequency resources may be accessed by
both UAVs and GUEs, resulting in mutual interference, and (ii)
overlay, where the available resources are divided into orthogonal
portions for U2U and ...
We consider a cellular network deployment where
UAV-to-UAV (U2U) transmit-receive pairs share the same spectrum
with the uplink (UL) of cellular ground users (GUEs).
For this setup, we focus on analyzing and comparing the
performance of two spectrum sharing mechanisms: (i) underlay,
where the same time-frequency resources may be accessed by
both UAVs and GUEs, resulting in mutual interference, and (ii)
overlay, where the available resources are divided into orthogonal
portions for U2U and GUE communications. We evaluate the
coverage probability and rate of both link types and their
interplay to identify the best spectrum sharing strategy. We do so
through an analytical framework that embraces realistic heightdependent
channel models, antenna patterns, and practical power
control mechanisms. For the underlay, we find that although the
presence of U2U direct communications may worsen the uplink
performance of GUEs, such effect is limited as base stations
receive the power-constrained UAV signals through their antenna
sidelobes. In spite of this, our results lead us to conclude that in
urban scenarios with a large number of UAV pairs, adopting an
overlay spectrum sharing seems the most suitable approach for
maintaining a minimum guaranteed rate for UAVs and a high
GUE UL performance.
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