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Paper Abstract and Keywords
Presentation 2026-03-06 09:30
Optimal Deployment of UAV Relays in Next-Generation Mobile Communications
Taiga Shimano, Kazuhiko fukawa (Science Tokyo) RCS2025-284
Abstract (in Japanese) (See Japanese page) 
(in English) This report focuses on millimeter-wave (mmWave) relay systems in complex urban environments, such as those envisioned for Beyond 5G. The objective is to deploy unmanned aerial vehicle (UAV) relays optimally in terms of both the coverage area and the limited number of UAV relays. Although mmWave mobile communications enable high bit-rate transmission, they suffer from severe signal attenuation and extremely small cell radii, which requires the deployment of relays.
To estimate the optimal locations of the UAV relays while minimizing their total number, the proposed method firstly identifies low signal-to-noise ratio (SNR) regions within a cell at low cost. For this purpose, the proposed scheme exploits information on multipaths at observation points obtained by ray tracing. The UAV relays are allocated so efficiently and optimally that they can increase the received power in those low SNR regions to more than a predefined threshold.
Specifically, combining the proposed SNR estimation method with a greedy algorithm-based optimal allocation of relays enables the system to reduce the computational complexity required for the ray tracing and to search for the optimal positions of the relays while accounting for physical propagation characteristics such as rigorous Line-of-Sight (LOS) information, reflection, and diffraction. Furthermore, when the initial positions for the greedy algorithm are obtained from rigorous LOS analyses, the method can avoid falling into local optima and can reduce the overall running time.
It is shown that the proposed scheme is superior in terms of both complexity and improvement in the coverage, to a conventional combination of relay allocation optimization based on the free-space path loss model and antenna directionality one.
Keyword (in Japanese) (See Japanese page) 
(in English) Beyond 5G / millimeter wave / relay / coverage area / ray tracing / greedy algorithm / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 387, RCS2025-284, pp. 146-151, March 2026.
Paper # RCS2025-284 
Date of Issue 2026-02-25 (RCS) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF RCS2025-284

Conference Information
Committee RCS SR SRW  
Conference Date 2026-03-04 - 2026-03-06 
Place (in Japanese) (See Japanese page) 
Place (in English) Tokyo University of Science 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Mobile Communication Workshop 
Paper Information
Registration To RCS 
Conference Code 2026-03-RCS-SR-SRW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Optimal Deployment of UAV Relays in Next-Generation Mobile Communications 
Sub Title (in English)  
Keyword(1) Beyond 5G  
Keyword(2) millimeter wave  
Keyword(3) relay  
Keyword(4) coverage area  
Keyword(5) ray tracing  
Keyword(6) greedy algorithm  
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Keyword(8)  
1st Author's Name Taiga Shimano  
1st Author's Affiliation Institute of Science Tokyo (Science Tokyo)
2nd Author's Name Kazuhiko fukawa  
2nd Author's Affiliation Institute of Science Tokyo (Science Tokyo)
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Speaker Author-1 
Date Time 2026-03-06 09:30:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2025-284 
Volume (vol) vol.125 
Number (no) no.387 
Page pp.146-151 
#Pages 6 
Date of Issue 2026-02-25 (RCS) 

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