Overcoming endurance issue : UAV-enabled communications with proactive caching

Wireless communication enabled by unmanned aerial vehicles (UAVs) has emerged as an appealing technology for many application scenarios in future wireless systems. However, the limited endurance of UAVs greatly hinders the practical implementation of UAV-enabled communications. To overcome this issu...

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Main Authors: Xu, Xiaoli, Zeng, Yong, Guan, Yong Liang, Zhang, Rui
Other Authors: School of Electrical and Electronic Engineering
Format: Article
Language:English
Published: 2019
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Online Access:https://hdl.handle.net/10356/85299
http://hdl.handle.net/10220/49201
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-852992020-03-07T13:57:27Z Overcoming endurance issue : UAV-enabled communications with proactive caching Xu, Xiaoli Zeng, Yong Guan, Yong Liang Zhang, Rui School of Electrical and Electronic Engineering UAV-enabled Communications Proactive Caching Engineering::Electrical and electronic engineering Wireless communication enabled by unmanned aerial vehicles (UAVs) has emerged as an appealing technology for many application scenarios in future wireless systems. However, the limited endurance of UAVs greatly hinders the practical implementation of UAV-enabled communications. To overcome this issue, this paper proposes a novel scheme for UAV-enabled communications by utilizing the promising technique of proactive caching at the users. Specifically, we focus on content-centric communication systems, where a UAV is dispatched to serve a group of ground nodes (GNs) with random and asynchronous requests for files drawn from a given set. With the proposed scheme, at the beginning of each operation period, the UAV pro-actively transmits the files to a subset of selected GNs that cooperatively cache all the files. As a result, when requested, a file can be retrieved by each GN either directly from its local cache or from its nearest neighbor that has cached the file via device-to-device communications. It is revealed that there exists a fundamental trade-off between the file caching cost, which is the total time required for the UAV to transmit the files to their designated caching GNs, and the file retrieval cost, which is the average time required for serving one file request. To characterize this trade-off, we formulate an optimization problem to minimize the weighted sum of the two costs, via jointly designing the file caching policy, the UAV trajectory, and communication scheduling. As the formulated problem is NP-hard in general, we propose efficient algorithms to find high-quality approximate solutions for it. Numerical results are provided to corroborate our study and show the great potential of proactive caching for overcoming the endurance issue in UAV-enabled communications. 2019-07-09T04:50:04Z 2019-12-06T16:01:04Z 2019-07-09T04:50:04Z 2019-12-06T16:01:04Z 2018 Journal Article Xu, X., Zeng, Y., Guan, Y. L., & Zhang, R. (2018). Overcoming Endurance Issue : UAV-Enabled Communications With Proactive Caching. IEEE Journal on Selected Areas in Communications, 36(6), 1231-1244. doi:10.1109/JSAC.2018.2844979 0733-8716 https://hdl.handle.net/10356/85299 http://hdl.handle.net/10220/49201 10.1109/JSAC.2018.2844979 en IEEE Journal on Selected Areas in Communications © 2018 IEEE. All right reserved.
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic UAV-enabled Communications
Proactive Caching
Engineering::Electrical and electronic engineering
spellingShingle UAV-enabled Communications
Proactive Caching
Engineering::Electrical and electronic engineering
Xu, Xiaoli
Zeng, Yong
Guan, Yong Liang
Zhang, Rui
Overcoming endurance issue : UAV-enabled communications with proactive caching
description Wireless communication enabled by unmanned aerial vehicles (UAVs) has emerged as an appealing technology for many application scenarios in future wireless systems. However, the limited endurance of UAVs greatly hinders the practical implementation of UAV-enabled communications. To overcome this issue, this paper proposes a novel scheme for UAV-enabled communications by utilizing the promising technique of proactive caching at the users. Specifically, we focus on content-centric communication systems, where a UAV is dispatched to serve a group of ground nodes (GNs) with random and asynchronous requests for files drawn from a given set. With the proposed scheme, at the beginning of each operation period, the UAV pro-actively transmits the files to a subset of selected GNs that cooperatively cache all the files. As a result, when requested, a file can be retrieved by each GN either directly from its local cache or from its nearest neighbor that has cached the file via device-to-device communications. It is revealed that there exists a fundamental trade-off between the file caching cost, which is the total time required for the UAV to transmit the files to their designated caching GNs, and the file retrieval cost, which is the average time required for serving one file request. To characterize this trade-off, we formulate an optimization problem to minimize the weighted sum of the two costs, via jointly designing the file caching policy, the UAV trajectory, and communication scheduling. As the formulated problem is NP-hard in general, we propose efficient algorithms to find high-quality approximate solutions for it. Numerical results are provided to corroborate our study and show the great potential of proactive caching for overcoming the endurance issue in UAV-enabled communications.
author2 School of Electrical and Electronic Engineering
author_facet School of Electrical and Electronic Engineering
Xu, Xiaoli
Zeng, Yong
Guan, Yong Liang
Zhang, Rui
format Article
author Xu, Xiaoli
Zeng, Yong
Guan, Yong Liang
Zhang, Rui
author_sort Xu, Xiaoli
title Overcoming endurance issue : UAV-enabled communications with proactive caching
title_short Overcoming endurance issue : UAV-enabled communications with proactive caching
title_full Overcoming endurance issue : UAV-enabled communications with proactive caching
title_fullStr Overcoming endurance issue : UAV-enabled communications with proactive caching
title_full_unstemmed Overcoming endurance issue : UAV-enabled communications with proactive caching
title_sort overcoming endurance issue : uav-enabled communications with proactive caching
publishDate 2019
url https://hdl.handle.net/10356/85299
http://hdl.handle.net/10220/49201
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