TIME TRANSMISSION CORRECTION DEVICE, TIME TRANSMISSION SYSTEM, AND DELAY MEASUREMENT METHOD

Title:

TIME TRANSMISSION CORRECTION DEVICE, TIME TRANSMISSION SYSTEM, AND DELAY MEASUREMENT METHOD

Document Type and Number:

WIPO Patent Application WO/2020/116200

Kind Code:

A1

Abstract:

[Problem] To provide a time synchronization mechanism not affected by link asymmetry between time synchronization devices. [Solution] A DC 4 is used for a time transmission system which transmits/receives PTP packets between a master node 1 and a slave node 2 via the DC 4 and synchronizes the time of the slave node 2 on the basis of time information of the transmission/reception, the DC having: a PTP clock unit 12 for synchronizing time information on the basis of arrived PTP packets; a frequency clock unit 21 that synchronizes the time information on the basis of a frequency signal; a delay setting unit 22 that sets the waiting time of the PTP packets so that a transmission delay of the PTP packets between the master node 1 and the slave node 2 becomes equal to a set delay Lmax on the basis of a time difference between the departure time of a PTP packet and the arrival time of the PTP packet to an own device determined from the time information of the frequency clock unit 21; and a time adjustment unit 26 that corrects time deviation from the reference time of the time information of the frequency clock unit 21 on the basis of the time information of the PTP clock unit 12.

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Inventors:

ARAI KAORU (JP)
SAKUMA HIROKI (JP)
NAKAGAWA MASAHIRO (JP)
TSUBOI SHUNICHI (JP)

Application Number:

PCT/JP2019/045760

Publication Date:

June 11, 2020

Filing Date:

November 22, 2019

Export Citation:

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Assignee:

NIPPON TELEGRAPH & TELEPHONE (JP)

International Classes:

H04L7/00; G04G5/00; G04G7/00; G06F1/14

Foreign References:

JP2013098788A	2013-05-20
JP2015099983A	2015-05-28
JP2015065525A	2015-04-09
JP2014216669A	2014-11-17

Other References:

SAKAI, SHOTA ET AL.: "A study of frequency/time synchronization message transfer in high-precision time synchronization systems", PROCEEDINGS OF THE 2017 IEICE GENERAL CONFERENCE, vol. 2, 7 March 2017 (2017-03-07), pages 242

Attorney, Agent or Firm:

ISONO INTERNATIONAL PATENT OFFICE, P.C. (JP)

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