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WO2009001583A1 - Time management server, time management program, and time management method - Google Patents

Time management server, time management program, and time management method

Info

Publication number
WO2009001583A1
WO2009001583A1 PCT/JP2008/054274 JP2008054274W WO2009001583A1 WO 2009001583 A1 WO2009001583 A1 WO 2009001583A1 JP 2008054274 W JP2008054274 W JP 2008054274W WO 2009001583 A1 WO2009001583 A1 WO 2009001583A1
Authority
WO
WIPO (PCT)
Prior art keywords
time management
clients
time
client
end internal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2008/054274
Other languages
French (fr)
Japanese (ja)
Inventor
Yuji Miyamoto
Ryota Akiyama
Yasuo Abe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Broad Solution and Consulting Inc
Original Assignee
Fujitsu Broad Solution and Consulting Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Broad Solution and Consulting Inc filed Critical Fujitsu Broad Solution and Consulting Inc
Publication of WO2009001583A1 publication Critical patent/WO2009001583A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G5/00—Setting, i.e. correcting or changing, the time-indication

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Debugging And Monitoring (AREA)
  • Computer And Data Communications (AREA)

Abstract

A computer having a fault in the internal clock is allowed to be accurately detected. A time information collecting means (1c) acquires local time indicated by client-end internal clocks of clients (2), (3), and (4). A delay time calculating means (1d) then calculates delay time in communication from transmission time and arrival time for each of the clients (2), (3), and (4). A fault detecting means (1e) corrects the local time on the basis of the delay time and judges whether or not the error between a server-end internal clock (1a) and the client-end internal clocks is within a predetermined threshold for each of the clients (2), (3), and (4). If the errors between all the clients (2), (3), and (4) exceed the threshold, it is judged that the server-end internal clock (1a) has the fault. If the number of clients the errors of which exceed the threshold is not more than a predetermined ratio, it is judged that the client-end internal clock of the client the error of which exceeds the threshold has the fault.
PCT/JP2008/054274 2007-06-26 2008-03-10 Time management server, time management program, and time management method Ceased WO2009001583A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007-167970 2007-06-26
JP2007167970A JP2009008444A (en) 2007-06-26 2007-06-26 Time management server, time management program, and time management method

Publications (1)

Publication Number Publication Date
WO2009001583A1 true WO2009001583A1 (en) 2008-12-31

Family

ID=40185407

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2008/054274 Ceased WO2009001583A1 (en) 2007-06-26 2008-03-10 Time management server, time management program, and time management method

Country Status (2)

Country Link
JP (1) JP2009008444A (en)
WO (1) WO2009001583A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107612788A (en) * 2017-11-07 2018-01-19 中国电子科技集团公司第二十八研究所 A kind of time server fault detection method, equipment and system

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012234275A (en) * 2011-04-28 2012-11-29 Nec System Technologies Ltd Real time clock correction circuit and real time clock correction method
JP5697154B2 (en) * 2011-08-15 2015-04-08 日本電気株式会社 Oscillator deterioration detection device and oscillator deterioration detection method
JP5505472B2 (en) * 2012-07-31 2014-05-28 カシオ計算機株式会社 Time information acquisition device and radio clock
FR3103035B1 (en) * 2019-11-12 2021-10-29 Continental Automotive Method for setting an on-board clock in a motor vehicle and associated setting device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08256161A (en) * 1995-03-15 1996-10-01 Nec Corp Time information synchronizing system for network
JPH10160873A (en) * 1996-12-04 1998-06-19 Nec Corp Time synchronization method
JP2004170139A (en) * 2002-11-18 2004-06-17 Hitachi Electronics Service Co Ltd Method for automatically correcting tod of terminal and system for automatic correction
JP2007068087A (en) * 2005-09-02 2007-03-15 Nippon Telegr & Teleph Corp <Ntt> Multipoint connection communication service subjective quality estimation method and apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08256161A (en) * 1995-03-15 1996-10-01 Nec Corp Time information synchronizing system for network
JPH10160873A (en) * 1996-12-04 1998-06-19 Nec Corp Time synchronization method
JP2004170139A (en) * 2002-11-18 2004-06-17 Hitachi Electronics Service Co Ltd Method for automatically correcting tod of terminal and system for automatic correction
JP2007068087A (en) * 2005-09-02 2007-03-15 Nippon Telegr & Teleph Corp <Ntt> Multipoint connection communication service subjective quality estimation method and apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107612788A (en) * 2017-11-07 2018-01-19 中国电子科技集团公司第二十八研究所 A kind of time server fault detection method, equipment and system

Also Published As

Publication number Publication date
JP2009008444A (en) 2009-01-15

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