Title:
TIME SYNCHRONIZATION DEVICE, TIME SYNCHRONIZATION METHOD, AND PROGRAM
Document Type and Number:
WIPO Patent Application WO/2022/259381
Kind Code:
A1
Abstract:
A time synchronization device (10) according to the present disclosure comprises: a selection unit (16) which selects one master device (1) for time synchronization from among a plurality of master devices (1); a correction value calculation unit (17) which calculates a time correction value for correcting an internal time so that said one master device (1) and the time synchronization device are synchronized; a correction value storage unit (18) which stores the immediately preceding time correction value used for correction of the internal time; and a correction value adjustment unit (19) which, when said one master device (1) is to be switched, adjusts, on the basis of the stored time correction value, the time correction value calculated for the master device (1) that is to be switched to, and corrects the internal time on the basis of the adjusted time correction value.
Inventors:
NAKANISHI TAKASHI (JP)
YAZAWA GO (JP)
YAMAGATA KEISUKE (JP)
YOSHIHARA SHINICHI (JP)
YAZAWA GO (JP)
YAMAGATA KEISUKE (JP)
YOSHIHARA SHINICHI (JP)
Application Number:
PCT/JP2021/021791
Publication Date:
December 15, 2022
Filing Date:
June 08, 2021
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
H04L7/00
Foreign References:
| JP2016502790A | 2016-01-28 |
Other References:
"IEEE P1588, Draft IEEE 1588-2019, IEEE Standard for a Precision Clock Synchronization Protocol for Networked Measurement and Control System", ITU-T DRAFT; STUDY PERIOD 2017-2020; STUDY GROUP 15,, June 2020 (2020-06-01), pages 41 - 48, 144-182, XP044297502
TAICHI SAKAUE, OSAMU TOYAMA, DAISUKE OSAGAWA, TERUAKI ITO: "A Time Synchronization Scheme on Grandmaster Switching for IEEE802.1AS", IEICE TECHNICAL REPORT; CS, IEICE, JP, vol. 118, no. 488 (CS2018-112), 1 March 2019 (2019-03-01), JP, pages 33 - 37, XP009534140
TAICHI SAKAUE, OSAMU TOYAMA, DAISUKE OSAGAWA, TERUAKI ITO: "A Time Synchronization Scheme on Grandmaster Switching for IEEE802.1AS", IEICE TECHNICAL REPORT; CS, IEICE, JP, vol. 118, no. 488 (CS2018-112), 1 March 2019 (2019-03-01), JP, pages 33 - 37, XP009534140
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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