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Paper Abstract and Keywords
Presentation 2026-06-18 09:45
Investigation of Joint Optimization of Reverse Use of TDD Frame and User Association in Co-existing Networks with HAPS and Terrestrial BSs
Yuto Hotta (Tokyo Univ. of Science), Satoshi Nagata, Satoshi Suyama (NTT DOCOMO), Kenichi Higuchi (Tokyo Univ. of Science) RCS2026-49
Abstract (in Japanese) (See Japanese page) 
(in English) In co-existing networks with high altitude platform stations (HAPS) and terrestrial base stations (TBSs), the reverse use of the time-division duplexing (TDD) frame has been reported as a method for mitigating inter-network interference. In this frame structure, the uplink and downlink transmissions in the same time slot are configured oppositely between HAPS and TBS. In addition, an adaptive control method for the time slot allocation ratio between downlink and uplink transmissions has been reported to maximize the system throughput, which is defined as the generalized mean of user throughput. However, the user association method used in this approach does not consider the impact on other users and therefore does not necessarily maximize the system throughput. Therefore, this paper investigates the joint optimization of the reverse use of TDD frame and user association. The proposed method realizes this joint optimization by alternately performing a user association method based on autonomous decentralized control and an adaptive control method for the time slot allocation ratio. Through computer simulations, we quantitatively evaluate the improvement in system throughput achieved by the proposed method and demonstrate its effectiveness.
Keyword (in Japanese) (See Japanese page) 
(in English) HAPS / Reverse use of TDD frame / System throughput / User association / Autonomous decentralized control / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 72, RCS2026-49, pp. 135-140, June 2026.
Paper # RCS2026-49 
Date of Issue 2026-06-10 (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)
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Conference Information
Committee RCS  
Conference Date 2026-06-17 - 2026-06-19 
Place (in Japanese) (See Japanese page) 
Place (in English) The Ohama Nobumoto Memorial Hall 
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 2026-06-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Investigation of Joint Optimization of Reverse Use of TDD Frame and User Association in Co-existing Networks with HAPS and Terrestrial BSs 
Sub Title (in English)  
Keyword(1) HAPS  
Keyword(2) Reverse use of TDD frame  
Keyword(3) System throughput  
Keyword(4) User association  
Keyword(5) Autonomous decentralized control  
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Keyword(7)  
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1st Author's Name Yuto Hotta  
1st Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
2nd Author's Name Satoshi Nagata  
2nd Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
3rd Author's Name Satoshi Suyama  
3rd Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
4th Author's Name Kenichi Higuchi  
4th Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
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Speaker Author-1 
Date Time 2026-06-18 09:45:00 
Presentation Time 10 minutes 
Registration for RCS 
Paper # RCS2026-49 
Volume (vol) vol.126 
Number (no) no.72 
Page pp.135-140 
#Pages 6 
Date of Issue 2026-06-10 (RCS) 

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