Wireless powered ALOHA networks with UAV-mounted base stations

Zoran Hadži-Velkov, Slavche Pejoski, Robert Schober, Nikola Zlatanov

Research output: Contribution to journalArticleResearchpeer-review

Abstract

In this paper, we study wireless powered communication networks (WPCNs) with base stations (BSs) mounted on unmanned aerial vehicles (UAVs). For implementation simplicity and uncoordinated access, the energy harvesting (EH) users (EHUs) employ slotted ALOHA to transmit information at a fixed rate to a common UAV-mounted BS. The UAV flying along a circular trajectory facilitates a line of sight (LoS) between the BS and each EHU, and also mitigates the adverse double near-far effect as it periodically comes close to the EHUs. Due to the periodicity of the LoS channels, the channel can be tracked without performing energy-costly channel estimation, and the channel attenuation can be compensated to avoid channel outages. For such a WPCN, we optimize the UAV radius, the channel access probability, and the rate of each EHU to enable proportionally fair resource allocation. Our solution reveals that, when a certain UAV altitude is exceeded, proportional fairness is attained when the UAV is in the hovering mode.
Original languageEnglish
Number of pages5
JournalIEEE Wireless Communications Letters
DOIs
Publication statusAccepted/In press - 16 Sep 2019

Cite this

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title = "Wireless powered ALOHA networks with UAV-mounted base stations",
abstract = "In this paper, we study wireless powered communication networks (WPCNs) with base stations (BSs) mounted on unmanned aerial vehicles (UAVs). For implementation simplicity and uncoordinated access, the energy harvesting (EH) users (EHUs) employ slotted ALOHA to transmit information at a fixed rate to a common UAV-mounted BS. The UAV flying along a circular trajectory facilitates a line of sight (LoS) between the BS and each EHU, and also mitigates the adverse double near-far effect as it periodically comes close to the EHUs. Due to the periodicity of the LoS channels, the channel can be tracked without performing energy-costly channel estimation, and the channel attenuation can be compensated to avoid channel outages. For such a WPCN, we optimize the UAV radius, the channel access probability, and the rate of each EHU to enable proportionally fair resource allocation. Our solution reveals that, when a certain UAV altitude is exceeded, proportional fairness is attained when the UAV is in the hovering mode.",
author = "Zoran Hadži-Velkov and Slavche Pejoski and Robert Schober and Nikola Zlatanov",
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language = "English",
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Wireless powered ALOHA networks with UAV-mounted base stations. / Hadži-Velkov, Zoran; Pejoski, Slavche; Schober, Robert; Zlatanov, Nikola.

In: IEEE Wireless Communications Letters, 16.09.2019.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

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AU - Hadži-Velkov, Zoran

AU - Pejoski, Slavche

AU - Schober, Robert

AU - Zlatanov, Nikola

PY - 2019/9/16

Y1 - 2019/9/16

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AB - In this paper, we study wireless powered communication networks (WPCNs) with base stations (BSs) mounted on unmanned aerial vehicles (UAVs). For implementation simplicity and uncoordinated access, the energy harvesting (EH) users (EHUs) employ slotted ALOHA to transmit information at a fixed rate to a common UAV-mounted BS. The UAV flying along a circular trajectory facilitates a line of sight (LoS) between the BS and each EHU, and also mitigates the adverse double near-far effect as it periodically comes close to the EHUs. Due to the periodicity of the LoS channels, the channel can be tracked without performing energy-costly channel estimation, and the channel attenuation can be compensated to avoid channel outages. For such a WPCN, we optimize the UAV radius, the channel access probability, and the rate of each EHU to enable proportionally fair resource allocation. Our solution reveals that, when a certain UAV altitude is exceeded, proportional fairness is attained when the UAV is in the hovering mode.

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JF - IEEE Wireless Communications Letters

SN - 2162-2337

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