Joint Caching and Trajectory Design for Cache-Enabled UAV in Vehicular Networks

Huaqing Wu, Jianying Chen, Feng Lyu, Li Wang, X. Shen
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引用次数: 8

Abstract

Cache-enabled unmanned aerial vehicles (UAVs) are envisioned as a key enabler to flexibly serve the ground traffic demand while eliminating the limited wireless backhaul links. However, how to utilize UAVs in highly dynamic vehicular networks is not well studied yet challenging with limited UAV energy and storage capacity. In this paper, considering the vehicle mobility and content requests, we study the problem of proactive content placement, trajectory design, and content delivery for cache-enabled UAV. This problem is formulated as an optimization problem aiming at maximizing the overall network throughput improvement under the UAV energy constraint, which is non-convex and difficult to solve. To tackle this problem, we propose an efficient algorithm with a two-layered structure. First, given a content placement strategy, we devise a time-based graph decomposition method to jointly optimize the content delivery and trajectory design. Next, with the optimized content delivery and trajectory, we then leverage the particle swarm optimization (PSO) algorithm to further optimize the content placement. Numerical results show that the proposed scheme can efficiently solve the joint optimization problem and adapt to the dynamic network conditions.
车载网络中高速缓存无人机联合缓存与轨迹设计
支持缓存的无人机(uav)被设想为灵活服务地面交通需求的关键推动者,同时消除有限的无线回程链路。然而,在无人机能量和存储能力有限的情况下,如何在高动态车辆网络中利用无人机还没有得到很好的研究。在本文中,考虑到车辆的移动性和内容请求,我们研究了基于缓存的无人机的主动内容放置、轨迹设计和内容交付问题。该问题被表述为在无人机能量约束下,以网络整体吞吐量提升最大化为目标的优化问题,该问题非凸且难以求解。为了解决这个问题,我们提出了一种双层结构的高效算法。首先,在给定内容投放策略的情况下,我们设计了一种基于时间的图分解方法来共同优化内容投放和轨迹设计。接下来,通过优化的内容交付和轨迹,我们利用粒子群优化(PSO)算法进一步优化内容放置。数值结果表明,该方案能有效地解决联合优化问题,适应动态网络条件。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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