Average Peak Age-of-Information Minimization in UAV-Assisted IoT Networks
Average Peak Age-of-Information Minimization in UAV-Assisted IoT Networks
复制标题
DOI：
10.1109/tvt.2018.2885871
复制
发表时间：
2019-02-01
影响因子：
6.8
通讯作者：
Dhillon, Harpreet S.
中科院分区：
文献类型：
--
作者：
Abd-Elmagid, Mohamed A.;Dhillon, Harpreet S.
在物联网(IoT)模式下，为了确保及时传递信息(例如，状态更新)，研究了无人机作为移动中继器的作用，以最小化源-目的地对的平均信息峰值年龄。对于这种设置，我们制定了一个优化问题，以联合优化无人机的飞行轨迹以及分组传输的能量和服务时间分配。为了解决这一非凸问题，我们提出了一种有效的迭代算法，并证明了它的解析性。文中还给出了一些子问题的闭合解。我们在这个过程中解决的子问题之一是联合优化无人机给定轨迹的能量和服务时间分配。这个问题本身就很有趣，因为在某些情况下，我们可能无法根据物联网设备的位置改变无人机的轨迹(特别是当它的主要任务是其他任务时)。我们的数值结果量化了通过额外优化无人机的轨迹可以获得的收益。
Motivated by the need to ensure timely delivery of information (e.g., status updates) in the Internet-of-Things (IoT) paradigm, this paper investigates the role of an unmanned aerial vehicle (UAV) as a mobile relay to minimize the average peak age-of-information for a source-destination pair. For this setup, we formulate an optimization problem to jointly optimize the UAV's flight trajectory as well as energy and service time allocations for packet transmissions. In order to solve this non-convex problem, we propose an efficient iterative algorithm and establish its convergence analytically. Closed-formsolutions for some sub-problems are also provided. One of the sub-problems we solve in this procedure is to jointly optimize the energy and service time allocations for a given trajectory of the UAV. This problem is of interest on its own right because in some cases we may not be able to alter the UAV's trajectory based on the locations of the IoT devices (especially when its primarymission is something else). Our numerical results quantify the gains that can be achieved by additionally optimizing the UAV's trajectory.