Unmanned Aerial Vehicle With Underlaid Device-to-Device Communications: Performance and Tradeoffs
Unmanned Aerial Vehicle With Underlaid Device-to-Device Communications: Performance and Tradeoffs
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DOI：
10.1109/twc.2016.2531652
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发表时间：
2016-06-01
影响因子：
10.4
通讯作者：
Debbah, Merouane
中科院分区：
文献类型：
--
作者：
Mozaffari, Mohammad;Saad, Walid;Debbah, Merouane
本文分析了无人机作为飞行基站在给定地理区域内提供飞行无线通信的部署问题。特别地，考虑了在下行链路上传输数据的无人机与底层设备对设备（D2D）通信网络之间的共存。对于该模型，导出了一个易于处理的覆盖率和比率分析框架。考虑两种场景:静态无人机和移动无人机。在第一种场景中，推导出该区域内用户的平均覆盖概率和系统求和率作为无人机高度和D2D用户数量的函数。在第二种情况下，使用磁盘覆盖问题，计算无人机为了完全覆盖该区域而需要访问的最小停止点数量。进一步，考虑无人机和D2D用户的多次重传，推导了D2D用户的总体中断概率。仿真和分析结果表明，随D2D用户密度的变化，存在导致系统和速率和覆盖概率最大的无人机高度最优值。此外，我们的研究结果还表明，通过使无人机在目标区域上智能移动，可以最小化无人机在覆盖整个区域时所需的总发射功率。最后，为了提供对感兴趣的区域的全面覆盖，在覆盖和延迟之间的权衡，在停止点的数量，进行了讨论。
In this paper, the deployment of an unmanned aerial vehicle (UAV) as a flying base station used to provide the fly wireless communications to a given geographical area is analyzed. In particular, the coexistence between the UAV, that is transmitting data in the downlink, and an underlaid device-to-device (D2D) communication network is considered. For this model, a tractable analytical framework for the coverage and rate analysis is derived. Two scenarios are considered: a static UAV and a mobile UAV. In the first scenario, the average coverage probability and the system sum-rate for the users in the area are derived as a function of the UAV altitude and the number of D2D users. In the second scenario, using the disk covering problem, the minimum number of stop points that the UAV needs to visit in order to completely cover the area is computed. Furthermore, considering multiple retransmissions for the UAV and D2D users, the overall outage probability of the D2D users is derived. Simulation and analytical results show that, depending on the density of D2D users, the optimal values for the UAV altitude, which lead to the maximum system sum-rate and coverage probability, exist. Moreover, our results also show that, by enabling the UAV to intelligently move over the target area, the total required transmit power of UAV while covering the entire area, can be minimized. Finally, in order to provide full coverage for the area of interest, the tradeoff between the coverage and delay, in terms of the number of stop points, is discussed.