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Paper Abstract and Keywords
Presentation 2022-03-11 10:40
Dynamic Scheduling Method Using Transmission Delay Manipulation via ACK for LoRa Wireless Network
Riki Bando, Akihiro Nakao (UTokyo) NS2021-150
Abstract (in Japanese) (See Japanese page) 
(in English) LoRa, one type of LPWA, uses ALOHA for the MAC layer protocol, which causes an increase in packet collisions due to overlapping of intermittent communication as the number of sensors increases. We have proposed a method of dynamically smoothing the traffic to shift transmission timing of each sensor by controlling the transmission delay via ACK responses, but this method has been evaluated only by simulation. In this paper, we evaluate the effectiveness of the proposed method with actual devices. The evaluation experiments show that the proposed method can improve the packet delivery rate by up to 92 % when each sensor is activated simultaneously, and by up to 35 % when each sensor is activated randomly, and can increase the number of devices in the bandwidth.
Keyword (in Japanese) (See Japanese page) 
(in English) IoT / LPWA / LoRa / Periodic Traffic / ALOHA / Transmission Delay Manipulation / /  
Reference Info. IEICE Tech. Rep., vol. 121, no. 433, NS2021-150, pp. 164-170, March 2022.
Paper # NS2021-150 
Date of Issue 2022-03-03 (NS) 
ISSN Online edition: ISSN 2432-6380
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 NS2021-150

Conference Information
Committee NS IN  
Conference Date 2022-03-10 - 2022-03-11 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) General 
Paper Information
Registration To NS 
Conference Code 2022-03-NS-IN 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Dynamic Scheduling Method Using Transmission Delay Manipulation via ACK for LoRa Wireless Network 
Sub Title (in English)  
Keyword(1) IoT  
Keyword(2) LPWA  
Keyword(3) LoRa  
Keyword(4) Periodic Traffic  
Keyword(5) ALOHA  
Keyword(6) Transmission Delay Manipulation  
1st Author's Name Riki Bando  
1st Author's Affiliation The University of Tokyo (UTokyo)
2nd Author's Name Akihiro Nakao  
2nd Author's Affiliation The University of Tokyo (UTokyo)
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Speaker Author-1 
Date Time 2022-03-11 10:40:00 
Presentation Time 20 minutes 
Registration for NS 
Paper # NS2021-150 
Volume (vol) vol.121 
Number (no) no.433 
Page pp.164-170 
Date of Issue 2022-03-03 (NS) 

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