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 $\beta$. 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 $\beta$, 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.

翻译：本文提出一个分析框架，研究信号干扰与传输队列管理之间的交互作用，及其对无人机在非授权频谱段运行时性能的影响。具体而言，我们构建了一个综合框架，用以分析无人机与地面用户通信时其他干扰链路对其造成的影响。为此，我们给出了因缓冲区溢出或排队时延过大导致的队列丢包概率闭式表达式，这些表达式根据信道衰落阈值$\beta$的函数形式的传输策略进行描述。进一步推导了由干扰信号或排队丢包引起的整体数据包丢失率，并据此获得了期望吞吐量性能。通过大量数值结果，我们研究了信道衰落阈值$\beta$的影响——该参数在平衡队列丢包与干扰过大导致传输错误之间的权衡中起关键作用。