Title:
時刻同期方法、ネットワークシステム、ＣＰＵ、中継機器、およびユーザ機器
Document Type and Number:
Japanese Patent JP6481807
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To perform time synchronization between a CPU and all user apparatuses without calculating transmission delay time in advance.SOLUTION: A GPS receiver unit 2010 transmits time information received from a GPS satellite to a time register control unit 2020. The time register control unit 2020 sets the time information to a reference time register 2030. A time synchronization packet generation unit 2040 generates a time synchronization packet including a time field in which reference time is set and a delay field and outputs the time synchronization packet to a packet transmission unit 2050. A standard interface transmission unit 2060 broadcasts the time synchronization packet to a plurality of user apparatuses. Each of a plurality of relay apparatuses on a packet route adds delay time in the relay apparatus to a delay field in the time synchronization packet. Each of the plurality of user apparatuses performs time correction by adding delay time to reference time at a point of time when the time synchronization has arrived.
Inventors:
Yasuhiro Soda
Application Number:
JP2014045138A
Publication Date:
March 13, 2019
Filing Date:
March 07, 2014
Export Citation:
Assignee:
NEC
International Classes:
H04L7/00; G04G5/00; H04L12/70
Domestic Patent References:
| JP2006003118A | ||||
| JP2012034224A | ||||
| JP2013168811A | ||||
| JP2011091624A | ||||
| JP2011023788A | ||||
| JP2013179392A | ||||
| JP2011199689A | ||||
| JP2009153055A | ||||
| JP2010016764A | ||||
| JP2012175567A |
Foreign References:
| WO2012086372A1 | ||||
| US20120128011 |
Attorney, Agent or Firm:
Kenho Ikeda
Takashi Sasaki
Takashi Sasaki