Title:
TIME SYNCHRONIZATION DEVICE AND TIME SYNCHRONIZATION METHOD
Document Type and Number:
WIPO Patent Application WO/2019/176619
Kind Code:
A1
Abstract:
[Problem] To enhance the quality of time information by suppressing time skipping that occurs during switching of transmission paths in a BC apparatus in which transmission paths for time information of at least two systems are connected to an input side. [Solution] A time synchronization device 20 is built into a BC apparatus 12c in which at least two systems, including a 0 system route (0 system) and a 1 system route (1 system), are connected to an input side, the time synchronization device 20 being provided with a time correction value retaining unit 26 that retains a 0 system correction value for which the time error of a result of a UTC being delayed due to performance unique to the BC apparatus has the same value as a time error accumulated on the 0-system side, and a 1 system correction value for which said time error has the same value as a time error accumulated on the 1-system side. Furthermore, the time synchronization device is provided with: a fault restoration detection unit 23 that detects a fault in the 0 system or the 1 system; a time counting unit 24 that, when a fault has been detected in the 0 system, performs a correction by subtracting the 1 system correction value pertaining to a normal 1 system from a UTC having a time error accumulated on the normal 1-system side; and a path switching unit 25 that, during detection of a fault, switches to the normal 1-system side so that the corrected UTC is transmitted.
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Inventors:
ARAI KAORU (JP)
SAKUMA HIROKI (JP)
HISASHIMA TAKAAKI (JP)
SUGIYAMA RYUTA (JP)
TSUBOI SHUNICHI (JP)
KUROKAWA OSAMU (JP)
MATSUMURA KAZUYUKI (JP)
SAKUMA HIROKI (JP)
HISASHIMA TAKAAKI (JP)
SUGIYAMA RYUTA (JP)
TSUBOI SHUNICHI (JP)
KUROKAWA OSAMU (JP)
MATSUMURA KAZUYUKI (JP)
Application Number:
PCT/JP2019/008415
Publication Date:
September 19, 2019
Filing Date:
March 04, 2019
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
G04G7/00; G04G5/00; H04L7/00
Domestic Patent References:
| WO2016198102A1 | 2016-12-15 |
Foreign References:
| JP2017022645A | 2017-01-26 | |||
| JP2006262461A | 2006-09-28 | |||
| JP2015065525A | 2015-04-09 |
Attorney, Agent or Firm:
ISONO INTERNATIONAL PATENT OFFICE, P.C. (JP)
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