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Paper Abstract and Keywords
Presentation 2026-03-06 10:20
Dynamic Antenna Weight Optimization Scheme for Capacity Enhancement and Footprint Fixation in Multi-Cell HAPS Systems
Koichi Maki, Koji Tashiro, Tsutomu Ishikawa, Wataru Takabatake, Kenji Hoshino (SoftBank) RCS2025-286
Abstract (in Japanese) (See Japanese page) 
(in English) High-altitude platform stations (HAPSs) have attracted increasing attention as a means of substantially extending 6G coverage. While a single HAPS can provide a wide service area with a radius on the order of 100 km, increasing service-link capacity to accommodate many users remains a key challenge, motivating multi-cell architectures with universal frequency reuse. The capacity strongly depends on the cell configuration, and platform attitude variations shift and deform the ground-projected cell shapes (footprints), resulting in frequent handovers. To jointly realize high capacity and footprint fixation, this paper proposes a neural network-based beamforming method. By directly optimizing antenna weights while explicitly accounting for the implemented antenna architecture, the proposed method simultaneously achieves an optimized cell configuration, inter-cell power allocation, and accurate footprint fixation. Computer simulations show that, in representative HAPS operating environments, the proposed method maintains a higher footprint-fixation rate than conventional approaches and improves the median spectral efficiency by at least 21%.
Keyword (in Japanese) (See Japanese page) 
(in English) high-altitude platform station (HAPS) / beamforming / antenna weight / neural network / footprint fixation / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 387, RCS2025-286, pp. 158-163, March 2026.
Paper # RCS2025-286 
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 RCS2025-286

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) Dynamic Antenna Weight Optimization Scheme for Capacity Enhancement and Footprint Fixation in Multi-Cell HAPS Systems 
Sub Title (in English)  
Keyword(1) high-altitude platform station (HAPS)  
Keyword(2) beamforming  
Keyword(3) antenna weight  
Keyword(4) neural network  
Keyword(5) footprint fixation  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Koichi Maki  
1st Author's Affiliation SoftBank Corp. (SoftBank)
2nd Author's Name Koji Tashiro  
2nd Author's Affiliation SoftBank Corp. (SoftBank)
3rd Author's Name Tsutomu Ishikawa  
3rd Author's Affiliation SoftBank Corp. (SoftBank)
4th Author's Name Wataru Takabatake  
4th Author's Affiliation SoftBank Corp. (SoftBank)
5th Author's Name Kenji Hoshino  
5th Author's Affiliation SoftBank Corp. (SoftBank)
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Speaker Author-1 
Date Time 2026-03-06 10:20:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2025-286 
Volume (vol) vol.125 
Number (no) no.387 
Page pp.158-163 
#Pages 6 
Date of Issue 2026-02-25 (RCS) 

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