Title:
TIME SYNCHRONIZATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2015/122027
Kind Code:
A1
Abstract:
The purpose of the present invention is to obtain a time synchronization device able to reduce the impact of delaying of time information notices and improve the accuracy of time synchronization between wireless devices. The invention is provided with: a time shift calculation unit (220) for comparing time information of a time master received from the time master and an internal time of a time slave at the time of time information receipt, and calculating a time shift amount of the internal time relative to the time information; a filtering constant determination unit (221) for performing a switching determination for a filtering constant of a filter used in filter processing of the time shift amount, on the basis of a variation amount calculated from the time shift amount; a filter processing unit (222) for performing the filter processing of the time shift amount, using the filtering constant; a time shift estimation unit (223) for estimating a time shift from a value obtained by filter-processing the time shift amount; and a slave time setting unit (23) for correcting the internal time on the basis of the time shift estimated value from the time shift estimation unit (223).
Inventors:
ASAHARA TAKASHI (JP)
Application Number:
PCT/JP2014/060527
Publication Date:
August 20, 2015
Filing Date:
April 11, 2014
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
H04L7/00; G04G5/00; G04R20/26; G06F13/00
Foreign References:
| JP2009077207A | 2009-04-09 | |||
| JP2013118502A | 2013-06-13 | |||
| JP2011029918A | 2011-02-10 | |||
| JP2009525710A | 2009-07-09 |
Attorney, Agent or Firm:
SAKAI, HIROAKI (JP)
Hiroaki Sakai (JP)
Hiroaki Sakai (JP)
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