UAV-Assisted Data Dissemination with Proactive Caching and File Sharing in V2X Networks
UAV-Assisted Data Dissemination with Proactive Caching and File Sharing in V2X Networks
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DOI：
10.1109/globecom38437.2019.9013226
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发表时间：
2019-12
期刊：
影响因子：
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通讯作者：
Rui Lu;Rongqing Zhang;Xiang Cheng;Liuqing Yang
中科院分区：
文献类型：
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作者：
Rui Lu;Rongqing Zhang;Xiang Cheng;Liuqing Yang
V2X （Vehicle-to-Everything）通信是指所有车辆和基础设施系统相互连接的智能互联车辆网络。数据传播在提高网络连通性和数据传输性能方面发挥着越来越重要的作用。然而，传统的场景和协议已不能满足所包含车辆日益增长的多元化和卓越的服务质量（QoS）需求。因此，在本文中，我们提出了一种新的无人机（UAV）辅助数据传播协议，该协议具有车辆上的主动缓存和先进的文件共享策略，以彻底改变通信。具体而言，在主动缓存阶段，我们采用无人机作为飞行基站（BSs）进行信息交互。在考虑时变网络拓扑结构的基础上，进一步提出了一种空间调度（SS）算法，对每架无人机进行轨迹优化，加快了缓存过程，提高了系统吞吐量。然后在文件共享阶段，基于之前的缓存状态，提出了一种中继排序算法来提高网络传输性能。数值结果验证了我们提出的无人机辅助数据传输协议在下载过程、网络吞吐量和平均数据传输延迟方面可以达到理想的系统性能。
Vehicle-to-Everything (V2X) communications refers to an intelligent and connected vehicular network where all vehicles and infrastructure systems are interconnected with each other. Data dissemination is playing an increasingly significant role in enhancing the network connectivity and data transmission performance. However, conventional scenarios and protocols cannot satisfy the growing pluralistic and superior quality of services (QoS) requirements of included vehicles. Therefore, in this paper, we propose a novel unmanned aerial vehicle (UAV)-assisted data dissemination protocol with proactive caching at the vehicles and an advanced file sharing strategy for revolutionizing communications. Specifically, in the proactive caching phase, we employ UAVs to act as flying base stations (BSs) for information interactions. Considering the time-variant network topology, we further propose a spatial scheduling (SS) algorithm for the trajectory optimization of each UAV, which can expedite the caching process and boost the system throughput. Then in the file sharing phase, based on the previous caching status, we provide a relay ordering algorithm to enhance the network transmission performance. Numerical results verify that our proposed UAV-assisted data transmission protocol can achieve a desirable system performance in terms of the downloading process, network throughput, and average data delivery delay.