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Paper Abstract and Keywords
Presentation 2022-10-05 13:00
Time Correction Method at Room Temperature Based on the Temperature Characteristics of Clock Frequency
Komichi Takezawa, Naoto Hoshikawa (Oyama College), Atsushi Shiraki, Tomoyoshi Ito, Tomoyoshi Shimobaba (Chiba Univ.) NS2022-79
Abstract (in Japanese) (See Japanese page) 
(in English) IoT devices require accurate time synchronization, but using NTP involves the risk due to communication with external devices. In addition, the GNSS or standard radio waves requires stable signal strength and additional devices for reception. We have the technology of adjusting the step frequency of the system time as a method without communication with external devices and additional devices. However, since the correction is generally adjusted by a constant value, it is vulnerable to environmental temperature changes, resulting in a significant loss of accuracy over a long time. In this paper, we propose a time correction method based on the temperature characteristics of clock frequency and evaluate whether the temperature characteristics measured in a thermostatic chamber could be available for time correction at room temperature. We also discuss the differences in temperature characteristics between the thermostatic chamber and room temperature environments. This system enables time correction without external communication and can be widely applied to existing CPUs because it uses a CPU temperature sensor.
Keyword (in Japanese) (See Japanese page) 
(in English) Time correction / CPU core temperature / Thermostatic chamber / Clock frequency / / / /  
Reference Info. IEICE Tech. Rep., vol. 122, no. 198, NS2022-79, pp. 4-4, Oct. 2022.
Paper # NS2022-79 
Date of Issue 2022-09-28 (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 NS2022-79

Conference Information
Committee NS  
Conference Date 2022-10-05 - 2022-10-07 
Place (in Japanese) (See Japanese page) 
Place (in English) Hokkaidou University + Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Network architecture (5G, Local 5G, Beyond5G, Mobile networks, Ad-hoc and sensor networks, Overlay and P2P networks, Programmable networks, SDN/NFV, IoT, Network slicing), Next generation packet transport (High speed Ethernet, IP over WDM, Multi-service package technology, MPLS), Grid, etc. 
Paper Information
Registration To NS 
Conference Code 2022-10-NS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Time Correction Method at Room Temperature Based on the Temperature Characteristics of Clock Frequency 
Sub Title (in English)  
Keyword(1) Time correction  
Keyword(2) CPU core temperature  
Keyword(3) Thermostatic chamber  
Keyword(4) Clock frequency  
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1st Author's Name Komichi Takezawa  
1st Author's Affiliation National Institute of Technology, Oyama College (Oyama College)
2nd Author's Name Naoto Hoshikawa  
2nd Author's Affiliation National Institute of Technology, Oyama College (Oyama College)
3rd Author's Name Atsushi Shiraki  
3rd Author's Affiliation Chiba University (Chiba Univ.)
4th Author's Name Tomoyoshi Ito  
4th Author's Affiliation Chiba University (Chiba Univ.)
5th Author's Name Tomoyoshi Shimobaba  
5th Author's Affiliation Chiba University (Chiba Univ.)
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Speaker Author-1 
Date Time 2022-10-05 13:00:00 
Presentation Time 25 minutes 
Registration for NS 
Paper # NS2022-79 
Volume (vol) vol.122 
Number (no) no.198 
Page p.4 
#Pages 1 
Date of Issue 2022-09-28 (NS) 

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