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Paper Abstract and Keywords
Presentation 2023-03-03 15:40
Proposal and Empirical Evaluation of Relay Communication Methods for LPWA Real-time Sensing
Kazuya Hirotsu, Katsunori Mizuno, Shigeru Tabeta (UTokyo), Tetsuo Shimada, Yasufumi Fujimoto (Izunuma Foundation), Akihiro Nakao (UTokyo) NS2022-251
Abstract (in Japanese) (See Japanese page) 
(in English) Real-time sensing of the natural environment often requires power-saving and long-distance communication, and LPWA communication methods are becoming popular, however, relay nodes in systems with relays need to be constantly powered. This research proposes two methods to reduce power consumption by enabling relay nodes to sleep. Sleep of relay nodes requires time synchronization between nodes and control of communication time, which is achieved by the relay node querying the end node for data in the first proposed method and by broadcasting time information and giving time slots to each end node in the second method. A comparative evaluation of the methods is carried out using simulations, and the implementation of the methods by LoRa Private and the improvement in power efficiency is shown through a demonstration in Izunuma, Miyagi Prefecture.
Keyword (in Japanese) (See Japanese page) 
(in English) LPWA / LoRa / Relay / Real-time sensing / MAC / / /  
Reference Info. IEICE Tech. Rep., vol. 122, no. 406, NS2022-251, pp. 481-486, March 2023.
Paper # NS2022-251 
Date of Issue 2023-02-23 (NS) 
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 NS2022-251

Conference Information
Committee IN NS  
Conference Date 2023-03-02 - 2023-03-03 
Place (in Japanese) (See Japanese page) 
Place (in English) Okinawa Convention Centre + Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) General 
Paper Information
Registration To NS 
Conference Code 2023-03-IN-NS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Proposal and Empirical Evaluation of Relay Communication Methods for LPWA Real-time Sensing 
Sub Title (in English)  
Keyword(1) LPWA  
Keyword(2) LoRa  
Keyword(3) Relay  
Keyword(4) Real-time sensing  
Keyword(5) MAC  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Kazuya Hirotsu  
1st Author's Affiliation The University of Tokyo (UTokyo)
2nd Author's Name Katsunori Mizuno  
2nd Author's Affiliation The University of Tokyo (UTokyo)
3rd Author's Name Shigeru Tabeta  
3rd Author's Affiliation The University of Tokyo (UTokyo)
4th Author's Name Tetsuo Shimada  
4th Author's Affiliation The Miyagi Prefectural Izunuma-Uchinuma Environmental Foundation (Izunuma Foundation)
5th Author's Name Yasufumi Fujimoto  
5th Author's Affiliation The Miyagi Prefectural Izunuma-Uchinuma Environmental Foundation (Izunuma Foundation)
6th Author's Name Akihiro Nakao  
6th Author's Affiliation The University of Tokyo (UTokyo)
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Speaker Author-1 
Date Time 2023-03-03 15:40:00 
Presentation Time 20 minutes 
Registration for NS 
Paper # NS2022-251 
Volume (vol) vol.122 
Number (no) no.406 
Page pp.481-486 
#Pages 6 
Date of Issue 2023-02-23 (NS) 

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