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In this paper, we present an analytical framework to explore the interplay ofsignal interference and transmission queue management, and their impacts on theperformance of unmanned aerial vehicles (UAVs) when operating in the unlicensedspectrum bands. In particular, we develop a comprehensive framework toinvestigate the impact of other interference links on the UAV as itcommunicates with the ground users. To this end, we provide closed-formexpressions for packet drop probabilities in the queue due to buffer overflowor large queuing delay, which are expressed in terms of a transmission policyas a function of the channel fading threshold $\beta$. The overall packet losscaused 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 channelfading threshold $\beta$, which plays an important role in balancing thetrade-offs between packet loss due to queue drop or transmission error due tolarge interference levels.

Exploring the Interplay of Interference and Queues in Unlicensed Spectrum Bands for UAV Networks