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Paper Abstract and Keywords
Presentation 2025-06-26 14:25
Early commercialization and system evolution for HAPS direct-to-mobile-phone service -- Inverse synchronization method for mitigating beam interference with adjacent HAPS in TDD communications of service links --
Yuki Hokazono, Hirofumi Nakajo, Daisuke Kurita, Atsunori Shimamura, Megumi Oozono, Kenji Fukasawa (NTT DOCOMO), Yuto Muroki (Space Compass), Munehiro Matsui, Hisayoshi Kano (NTT) RCS2025-71
Abstract (in Japanese) (See Japanese page) 
(in English) To enable communication services from high-altitude platform stations (HAPSs) in various locations, we focus on utilizing the unused band34 / n34 time division duplex (TDD) in Japan, combined with regenerative payloads that enable satellites to serve as backhaul alternatives to terrestrial gateway stations. Efficient use of the limited 15MHz bandwidth of band34 / n34 between adjacent HAPS requires exploring strategies beyond bandwidth partitioning, including suppressing interference while allowing full bandwidth access. In this paper, we propose an inverse synchronization method that reverses the uplink and downlink directions for synchronization between adjacent HAPS systems, showing that interference control can be maintained even without synchronization. Evaluation of co-channel interference among HAPS systems demonstrates that the proposed method improves overall throughput over conventional TDD synchronization methods.
Keyword (in Japanese) (See Japanese page) 
(in English) NTN / HAPS / 5G Evolution & 6G / extreme coverage extention / TDD / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 88, RCS2025-71, pp. 239-244, June 2025.
Paper # RCS2025-71 
Date of Issue 2025-06-17 (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)
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Conference Information
Committee RCS  
Conference Date 2025-06-24 - 2025-06-26 
Place (in Japanese) (See Japanese page) 
Place (in English) Asahikawa-Shimin-Bunka-Kaikan 
Topics (in Japanese) (See Japanese page) 
Topics (in English) First Presentation in IEICE Technical Committee, Resource Control, Scheduling, Wireless Communications, etc. 
Paper Information
Registration To RCS 
Conference Code 2025-06-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Early commercialization and system evolution for HAPS direct-to-mobile-phone service 
Sub Title (in English) Inverse synchronization method for mitigating beam interference with adjacent HAPS in TDD communications of service links 
Keyword(1) NTN  
Keyword(2) HAPS  
Keyword(3) 5G Evolution & 6G  
Keyword(4) extreme coverage extention  
Keyword(5) TDD  
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1st Author's Name Yuki Hokazono  
1st Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
2nd Author's Name Hirofumi Nakajo  
2nd Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
3rd Author's Name Daisuke Kurita  
3rd Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
4th Author's Name Atsunori Shimamura  
4th Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
5th Author's Name Megumi Oozono  
5th Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
6th Author's Name Kenji Fukasawa  
6th Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
7th Author's Name Yuto Muroki  
7th Author's Affiliation Space Compass Corporation (Space Compass)
8th Author's Name Munehiro Matsui  
8th Author's Affiliation NTT Corporation (NTT)
9th Author's Name Hisayoshi Kano  
9th Author's Affiliation NTT Corporation (NTT)
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Speaker Author-1 
Date Time 2025-06-26 14:25:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2025-71 
Volume (vol) vol.125 
Number (no) no.88 
Page pp.239-244 
#Pages 6 
Date of Issue 2025-06-17 (RCS) 

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