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Paper Abstract and Keywords
Presentation 2026-05-14 15:25
Periodic BS Placement and Beam Reconfiguration in Indoor mmWave Networks via Recurrent DQN with Candidate Prescreening under Partial Observability
Takeru Fukushima, Shoko Shinohara, Toshiro Nakahira, Daisuke Murayama, Yusuke Asai (NTT), Takuya Fujihashi, Shunsuke Saruwatari (The university of osaka) CQ2026-2
Abstract (in Japanese) (See Japanese page) 
(in English) Indoor millimeter-wave (mmWave) networks require periodic reconfiguration of base-station (BS) placement and beam directions to cope with blockage-induced quality degradation and temporal variations in user distribution.
This problem is challenging because BS relocation and beam switching are subject to time-coupled operational constraints, such as actuation delay, change lock, and limited reconfiguration budgets, while the controller observes only partial and noisy user information. In addition, the joint action space of BS placement and beam selection is large.
This paper formulates periodic reconfiguration as a partially observable sequential decision-making problem and proposes a two-stage control framework.
The first stage generates feasible local-neighborhood candidates and retains promising ones by surrogate-score-based prescreening, thereby reducing the practical action space.
The second stage performs history-aware value comparison over the retained candidates using a gated recurrent unit (GRU)-based deep Q network (DQN).
Simulation results in a dynamic indoor environment show that, under the evaluated setting, the proposed framework improves both lower-tail and average signal to interference-plus-noise ratio over greedy baselines and a non-GRU DQN, without an excessive increase in cumulative switch cost.
The results also support the effectiveness of combining observation-history utilization with candidate prescreening for periodic mmWave reconfiguration under partial observability.
Keyword (in Japanese) (See Japanese page) 
(in English) Wireless network / millimeter-wave / network optimization / deep Q network / / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 20, CQ2026-2, pp. 7-12, May 2026.
Paper # CQ2026-2 
Date of Issue 2026-05-07 (CQ) 
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 CQ2026-2

Conference Information
Committee CQ CS SAT  
Conference Date 2026-05-14 - 2026-05-15 
Place (in Japanese) (See Japanese page) 
Place (in English) Kushiro Chamber of Commerce & Industry 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To CQ 
Conference Code 2026-05-CQ-CS-SAT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Periodic BS Placement and Beam Reconfiguration in Indoor mmWave Networks via Recurrent DQN with Candidate Prescreening under Partial Observability 
Sub Title (in English)  
Keyword(1) Wireless network  
Keyword(2) millimeter-wave  
Keyword(3) network optimization  
Keyword(4) deep Q network  
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1st Author's Name Takeru Fukushima  
1st Author's Affiliation NTT, Inc. (NTT)
2nd Author's Name Shoko Shinohara  
2nd Author's Affiliation NTT, Inc. (NTT)
3rd Author's Name Toshiro Nakahira  
3rd Author's Affiliation NTT, Inc. (NTT)
4th Author's Name Daisuke Murayama  
4th Author's Affiliation NTT, Inc. (NTT)
5th Author's Name Yusuke Asai  
5th Author's Affiliation NTT, Inc. (NTT)
6th Author's Name Takuya Fujihashi  
6th Author's Affiliation The university of osaka (The university of osaka)
7th Author's Name Shunsuke Saruwatari  
7th Author's Affiliation The university of osaka (The university of osaka)
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Speaker Author-1 
Date Time 2026-05-14 15:25:00 
Presentation Time 25 minutes 
Registration for CQ 
Paper # CQ2026-2 
Volume (vol) vol.126 
Number (no) no.20 
Page pp.7-12 
#Pages 6 
Date of Issue 2026-05-07 (CQ) 

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