Modeling and Coverage Analysis for Cellular-Connected UAVs With Up-Tilted Antenna
Modeling and Coverage Analysis for Cellular-Connected UAVs With Up-Tilted Antenna
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DOI：
10.1109/lcomm.2022.3188683
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发表时间：
2022-11
期刊：
影响因子：
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通讯作者：
Yuanyuan Du;Hongtao Zhang;Jinlin Peng
中科院分区：
文献类型：
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作者：
Yuanyuan Du;Hongtao Zhang;Jinlin Peng
现有的蜂窝网络主要是为地面用户设计的，天线向下倾斜，无法为无人机用户提供有效的3D覆盖。本文提出了上倾斜天线模型，为蜂窝连接的无人机提供3D无缝覆盖，并通过随机几何推导了空中用户(AU)和TU的覆盖概率，其中，上下倾斜天线之间的相互干扰得到了表征。具体地说，采用了半功率波束宽度可调的实际天线模型，通过对功率分配参数α的建模，考虑了上下倾斜天线之间的功率约束，并重新推导了考虑相互干扰的干扰拉普拉斯变换。此外，理论分析基于覆盖概率的半封闭表达式，可以用来探索各种系统参数的影响。数值结果表明，当10%的功率分配给上倾天线(α=0.9美元)时，与只有下倾天线相比，AUS的覆盖概率可以显著提高192%，而TU的覆盖概率降低不到1%。
Existing cellular network is designed mainly for terrestrial users (TUs) with down-tilted antennas, which couldn’t provide efficient 3D coverage for UAV users. This letter proposes up-tilted antenna model to provide 3D seamless coverage for cellular-connected UAVs, and derives coverage probability for both aerial users (AUs) and TUs via stochastic geometry, where the mutual interference between up-tilted and down-tilted antennas is characterized. Specifically, practical antenna model with tunable half power beamwidth $\theta _{k}$ is adopted and power constraint between up-tilted and down-tilted antenna is considered by modelling power allocation parameter $\alpha $ , where the interference Laplace transform is rederived considering the mutual interference. In addition, the theoretical analysis is based on semi-closed expression of coverage probability, which can be used to explore the impact of various system parameters. Numerical results show that when 10% of the power is allocated to up-tilted antenna ( $\alpha =0.9$ ), coverage probability of AUs can be significantly increased by 192%, while coverage probability of TUs reduced by less than 1%, compared with only down-tilted antenna.