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Paper Abstract and Keywords
Presentation 2023-08-31 13:10
[Invited Lecture] Nullforming and Coordination Techniques for Spectrum Sharing between High-Altitude Platforms and Terrestrial Networks
Koji Tashiro, Kenji Hoshino, Atsushi Nagate (SoftBank) SAT2023-37 RCS2023-108
Abstract (in Japanese) (See Japanese page) 
(in English) Non-terrestrial networks (NTNs) using high-altitude platform stations (HAPSs) have garnered significant attention as a leading technology for providing an extended coverage in mobile communications. For operating multiple HAPSs using the same frequency band as terrestrial networks, interference with terrestrial cells, which is produced by HAPSs, and interference between HAPSs should be properly managed. The authors have considered nullforming and coordination techniques for spectrum sharing between HAPSs and terrestrial networks. In this invited lecture, we introduce a nullforming technique combined with subarray grouping for reducing the interference with service areas of neighboring HAPSs, targeting massive MIMO systems with a cylindrical array antenna that achieves the service area with a radius of 100 km. In addition, nullforming schemes for mitigating the interference with terrestrial cells are also introduced. Furthermore, we give a presentation on a null-sweeping scheme where HAPSs switch the direction of nulls in time and/or frequency domain in coordination with terrestrial base stations, which can improve the interference reduction performance through multiple nulls with different directions.
Keyword (in Japanese) (See Japanese page) 
(in English) high-altitude platform station / spectrum sharing / nullforming / null-sweeping / interference reduction / / /  
Reference Info. IEICE Tech. Rep., vol. 123, no. 172, RCS2023-108, pp. 36-36, Aug. 2023.
Paper # RCS2023-108 
Date of Issue 2023-08-24 (SAT, 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 SAT2023-37 RCS2023-108

Conference Information
Committee RCS SAT  
Conference Date 2023-08-31 - 2023-09-01 
Place (in Japanese) (See Japanese page) 
Place (in English) Naganoken Nokyo Building, and online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Satellite Communications, Broadcasting, Forward Error Correction, Wireless Communications, etc. 
Paper Information
Registration To RCS 
Conference Code 2023-08-RCS-SAT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Nullforming and Coordination Techniques for Spectrum Sharing between High-Altitude Platforms and Terrestrial Networks 
Sub Title (in English)  
Keyword(1) high-altitude platform station  
Keyword(2) spectrum sharing  
Keyword(3) nullforming  
Keyword(4) null-sweeping  
Keyword(5) interference reduction  
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1st Author's Name Koji Tashiro  
1st Author's Affiliation SoftBank Corp. (SoftBank)
2nd Author's Name Kenji Hoshino  
2nd Author's Affiliation SoftBank Corp. (SoftBank)
3rd Author's Name Atsushi Nagate  
3rd Author's Affiliation SoftBank Corp. (SoftBank)
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Speaker Author-1 
Date Time 2023-08-31 13:10:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # SAT2023-37, RCS2023-108 
Volume (vol) vol.123 
Number (no) no.171(SAT), no.172(RCS) 
Page p.24(SAT), p.36(RCS) 
#Pages 1 
Date of Issue 2023-08-24 (SAT, RCS) 

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