In this paper, we present an analytical framework to explore the interplay of
signal interference and transmission queue management, and their impacts on the
performance of unmanned aerial vehicles (UAVs) when operating in the unlicensed
spectrum bands. In particular, we develop a comprehensive framework to
investigate the impact of other interference links on the UAV as it
communicates with the ground users. To this end, we provide closed-form
expressions for packet drop probabilities in the queue due to buffer overflow
or large queuing delay, which are expressed in terms of a transmission policy
as a function of the channel fading threshold β. The overall packet loss
caused either by interference signals or queuing packet drop is obtained,
which, in turn, yields in obtaining the expected throughput performance.
Through extensive numerical results, we investigate the impact of the channel
fading threshold β, which plays an important role in balancing the
trade-offs between packet loss due to queue drop or transmission error due to
large interference levels.Comment: Asilomar Conference on Signals, Systems, and Computer