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arXiv 2008.00218eess.SP
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IoT网络中的UAV中继辅助应急通信:资源分配和轨迹优化

UAV Relay-Assisted Emergency Communications in IoT Networks: Resource Allocation and Trajectory Optimization

Dinh-Hieu Tran, Van-Dinh Nguyen, Sumit Gautam, Symeon Chatzinotas, Thang X. Vu, Bjorn Ottersten

摘要:

无人飞行器(UAV)通信已经成为用于紧急通信的突出技术(例如,物联网(IoT)网络中的自然灾害(自然灾害),以提高灾害预测,损失评估和救援行动的能力。无人机可以部署为飞行基站(BS),从时间受限的物联网设备收集数据,然后将其传输到地面网关(GW)。通常,IoT设备的延迟约束和UAV有限的存储容量高度阻碍了UAV辅助IoT网络的实际应用。在本文中,{全双工(FD)无线电}采用的无人机,以克服这些挑战。此外,还考虑了用于基于无人机的中继的半双工(HD)方案,以提供两种模式之间的比较研究(即,FD和HD)。{在此,如果设备的数据由UAV收集并且在飞行时间期间及时传送到GW,则认为设备被成功服务}。在这种情况下,我们的目标是通过联合优化带宽,功率分配和无人机轨迹,同时满足每个设备的要求和无人机有限的存储容量,最大限度地增加服务的物联网设备的数量。由于其非凸性和组合性质,制定的优化问题是麻烦的解决。{对于有吸引力的应用,我们首先将二进制变量放宽为连续变量,并将原始问题转换为更易于计算的形式。利用内逼近框架,我们得到新的近似函数的非凸部分,然后开发一个简单而有效的迭代算法的解决方案。接下来,我们尝试根据所服务的IoT设备的数量来最大化总吞吐量。最后,数值结果表明,所提出的算法显着优于基准方法的服务物联网设备的数量和系统吞吐量。

英文摘要:

Unmanned aerial vehicle (UAV) communication has emerged as a prominent technology for emergency communications (e.g., natural disaster) in the Internet of Things (IoT) networks to enhance the ability of disaster prediction, damage assessment, and rescue operations promptly. A UAV can be deployed as a flying base station (BS) to collect data from time-constrained IoT devices and then transfer it to a ground gateway (GW). In general, the latency constraint at IoT devices and UAV's limited storage capacity highly hinder practical applications of UAV-assisted IoT networks. In this paper, {full-duplex (FD) radio} is adopted at the UAV to overcome these challenges. In addition, half-duplex (HD) scheme for UAV-based relaying is also considered to provide a comparative study between two modes (viz., FD and HD). {Herein, a device is considered to be successfully served iff its data is collected by the UAV and conveyed to GW timely during flight time}. In this context, we aim to maximize the number of served IoT devices by jointly optimizing bandwidth, power allocation, and the UAV trajectory while satisfying each device's requirement and the UAV's limited storage capacity. The formulated optimization problem is troublesome to solve due to its non-convexity and combinatorial nature. {Towards appealing applications, we first relax binary variables into continuous ones and transform the original problem into a more computationally tractable form.} By leveraging inner approximation framework, we derive newly approximated functions for non-convex parts and then develop a simple yet efficient iterative algorithm for its solutions. Next, we attempt to maximize the total throughput subject to the number of served IoT devices. Finally, numerical results show that the proposed algorithms significantly outperform benchmark approaches in terms of the number of served IoT devices and system throughput.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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