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Paper Abstract and Keywords
Presentation 2019-03-08 14:25
A Time Synchronization Scheme on Grandmaster Switching for IEEE802.1AS
Taichi Sakaue, Osamu Toyama, Daisuke Osagawa, Teruaki Ito (Mitsubishi Electric) CAS2018-144 CS2018-112
Abstract (in Japanese) (See Japanese page) 
(in English) Recently, IEEE802.1 TSN (Time Sensitive Networking) is being applied for industrial networks which is used in automotive systems and factory automation (FA) systems. TSN is a suite of protocols which improve real time performance (isochronous performance) and network redundancy for requirements of industrial networks. In TSN, network nodes synchronize their time each other to control timing of frame forwarding. IEEE802.1AS standardizes a time synchronization protocol of TSN. In IEEE802.1AS, a grandmaster delivers reference time to the other nodes in a system. And the nodes synchronize to the reference time. A grandmaster is selected by Best Master Clock Algorithm (BMCA) selects a node which has the highest grandmaster priority as a grandmaster. While, the node who has the highest priority is newly connected to in operation, it becomes grandmaster. Then if that grandmaster has reference time which is different from the current one, time leap occurs in the other nodes. Then this system can’t control in real time because of a temporary gap of communication timing. Therefore, we propose a grandmaster switching scheme to prevent time leap and out of synchronization in a system. Theoretical analysis confirms that the proposed scheme is effective to mitigate a discontinuity in the time base.
Keyword (in Japanese) (See Japanese page) 
(in English) IEEE802.1AS / Synchronization / / / / / /  
Reference Info. IEICE Tech. Rep., vol. 118, no. 489, CS2018-112, pp. 33-37, March 2019.
Paper # CS2018-112 
Date of Issue 2019-03-01 (CAS, CS) 
ISSN Print edition: ISSN 0913-5685  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 CAS2018-144 CS2018-112

Conference Information
Committee CAS CS  
Conference Date 2019-03-08 - 2019-03-09 
Place (in Japanese) (See Japanese page) 
Place (in English) Shonan Institute of Technology 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Network processor, Signal processing and circuits for communications, Wireless LAN / PAN, etc. 
Paper Information
Registration To CS 
Conference Code 2019-03-CAS-CS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Time Synchronization Scheme on Grandmaster Switching for IEEE802.1AS 
Sub Title (in English)  
Keyword(1) IEEE802.1AS  
Keyword(2) Synchronization  
1st Author's Name Taichi Sakaue  
1st Author's Affiliation Mitsubishi Electric Corporation (Mitsubishi Electric)
2nd Author's Name Osamu Toyama  
2nd Author's Affiliation Mitsubishi Electric Corporation (Mitsubishi Electric)
3rd Author's Name Daisuke Osagawa  
3rd Author's Affiliation Mitsubishi Electric Corporation (Mitsubishi Electric)
4th Author's Name Teruaki Ito  
4th Author's Affiliation Mitsubishi Electric Corporation (Mitsubishi Electric)
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Date Time 2019-03-08 14:25:00 
Presentation Time 25 
Registration for CS 
Paper # IEICE-CAS2018-144,IEICE-CS2018-112 
Volume (vol) IEICE-118 
Number (no) no.488(CAS), no.489(CS) 
Page pp.33-37 
#Pages IEICE-5 
Date of Issue IEICE-CAS-2019-03-01,IEICE-CS-2019-03-01 

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