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Paper Abstract and Keywords
Presentation 2024-07-18 10:15
Experimental Evaluation of Air-Ground Spectrum Sharing Scheme Based on Nullforming Techniques
Koji Tashiro, Tsutomu Ishikawa, Kenji Hoshino, Atsushi Nagate (SoftBank) RCS2024-97
Abstract (in Japanese) (See Japanese page) 
(in English) High-altitude platform stations (HAPSs) have attracted significant attention as a leading technology to provide an extended coverage in mobile communications. For achieving the air-ground spectrum sharing, a nullforming-based interference reduction scheme has been developed, where a cylindrical array antenna mounted on the aircraft forms a null in the direction of each terrestrial base station (BS) located inside the HAPS service area. However, to the best of our knowledge, there have been no studies on the practical implementation of the air-ground spectrum sharing scheme based on nullforming techniques. Therefore, its performance in a real environment has not been revealed. In this study, we implement the nullforming scheme on the 5G-based cylindrical array antenna system which we have developed. In addition, we evaluate its performance through a field trial where an aerial BS on a tethered balloon with the cylindrical array antenna and a terrestrial BS share a common frequency band. Experimental results demonstrate that our scheme improves the throughput of the terrestrial BS by up to 2.6 times by reducing the interference, where no large degradation can be observed in the throughput of the aerial BS.
Keyword (in Japanese) (See Japanese page) 
(in English) high-altitude platform / spectrum sharing / nullforming / interference reduction / cylindrical array antenna / / /  
Reference Info. IEICE Tech. Rep., vol. 124, no. 107, RCS2024-97, pp. 64-69, July 2024.
Paper # RCS2024-97 
Date of Issue 2024-07-10 (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 RCS2024-97

Conference Information
Committee RCC RCS SeMI NS SR RISING  
Conference Date 2024-07-17 - 2024-07-19 
Place (in Japanese) (See Japanese page) 
Place (in English) Hokkaido Citizens Activities Promotion Center 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To RCS 
Conference Code 2024-07-RCC-RCS-SeMI-NS-SR-RISING 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Experimental Evaluation of Air-Ground Spectrum Sharing Scheme Based on Nullforming Techniques 
Sub Title (in English)  
Keyword(1) high-altitude platform  
Keyword(2) spectrum sharing  
Keyword(3) nullforming  
Keyword(4) interference reduction  
Keyword(5) cylindrical array antenna  
Keyword(6)  
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Keyword(8)  
1st Author's Name Koji Tashiro  
1st Author's Affiliation SoftBank Corp. (SoftBank)
2nd Author's Name Tsutomu Ishikawa  
2nd Author's Affiliation SoftBank Corp. (SoftBank)
3rd Author's Name Kenji Hoshino  
3rd Author's Affiliation SoftBank Corp. (SoftBank)
4th Author's Name Atsushi Nagate  
4th Author's Affiliation SoftBank Corp. (SoftBank)
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Speaker Author-1 
Date Time 2024-07-18 10:15:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2024-97 
Volume (vol) vol.124 
Number (no) no.107 
Page pp.64-69 
#Pages 6 
Date of Issue 2024-07-10 (RCS) 

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