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Paper Abstract and Keywords
Presentation 2026-03-03 17:55
ACK Duplication Method for Suppressing TCP Retransmissions in a 920MHz Private LoRa Network
Eisho Aramaki, Daiki Nobayashi, Kazuya Tsukamoto, Takeshi Ikenaga (KIT), Goshi Sato, Kenichi Takizawa (NICT) SITE2025-88 IA2025-87
Abstract (in Japanese) (See Japanese page) 
(in English) Low-Power Wide-Area (LPWA) is a major communication technology for the Internet of Things (IoT). Many LPWA-based sensor networks rely on protocols specific to each standard and cannot communicate directly with devices on IP networks. To improve interoperability with Internet applications, a previous study enabled single-hop TCP/IP communication over Private LoRa. However, under the stop-and-wait operation assumed for TCP/IP over Private LoRa, ACK losses hinder the progress of communication as much as data losses and thus become a critical factor directly impacting performance. Therefore, to improve reliability and throughput through multi-channel utilization and redundancy, a configuration that employs two Private LoRa interfaces can be considered. In this study, we construct a multi-hop TCP/IP environment over Private LoRa and improve TCP acknowledgement reliability by duplicating TCP ACKs and transmitting them simultaneously over the two interfaces. Experiments on actual devices under packet-loss conditions in single-hop and multi-hop settings demonstrate improved goodput with fewer TCP data retransmissions, at the cost of additional transmission overhead.
Keyword (in Japanese) (See Japanese page) 
(in English) Low-Power Wide-Area / LPWA / Private LoRa / TCP/IP / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 379, IA2025-87, pp. 71-77, March 2026.
Paper # IA2025-87 
Date of Issue 2026-02-24 (SITE, IA) 
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 SITE2025-88 IA2025-87

Conference Information
Committee IA SITE IPSJ-IOT  
Conference Date 2026-03-03 - 2026-03-05 
Place (in Japanese) (See Japanese page) 
Place (in English) Okinawa Industry Support Center 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Internet and Information Ethics Education, etc. 
Paper Information
Registration To IA 
Conference Code 2026-03-IA-SITE-IOT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) ACK Duplication Method for Suppressing TCP Retransmissions in a 920MHz Private LoRa Network 
Sub Title (in English)  
Keyword(1) Low-Power Wide-Area  
Keyword(2) LPWA  
Keyword(3) Private LoRa  
Keyword(4) TCP/IP  
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1st Author's Name Eisho Aramaki  
1st Author's Affiliation Kyushu Institute of Technology (KIT)
2nd Author's Name Daiki Nobayashi  
2nd Author's Affiliation Kyushu Institute of Technology (KIT)
3rd Author's Name Kazuya Tsukamoto  
3rd Author's Affiliation Kyushu Institute of Technology (KIT)
4th Author's Name Takeshi Ikenaga  
4th Author's Affiliation Kyushu Institute of Technology (KIT)
5th Author's Name Goshi Sato  
5th Author's Affiliation National Institute of Information and Communications Technology (NICT)
6th Author's Name Kenichi Takizawa  
6th Author's Affiliation National Institute of Information and Communications Technology (NICT)
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Speaker Author-1 
Date Time 2026-03-03 17:55:00 
Presentation Time 25 minutes 
Registration for IA 
Paper # SITE2025-88, IA2025-87 
Volume (vol) vol.125 
Number (no) no.378(SITE), no.379(IA) 
Page pp.71-77 
#Pages 7 
Date of Issue 2026-02-24 (SITE, IA) 

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