Title:
METHOD AND SYSTEM FOR CLOCK SYNCHRONIZATION OF BROADBAND OVER POWER LINE NODES, AND MANAGEMENT NODE THEREOF
Document Type and Number:
WIPO Patent Application WO/2010/149045
Kind Code:
A1
Abstract:
The invention discloses a method and system for clock synchronization of Broadband over Power Line (BPL) nodes, and also discloses a management node. The method includes: A master clock is set as the management node of a power line network, after an ordinary node which needs to synchronize its clock identifies the master clock according to an announce message sent by said management node, the ordinary node acting as a slave clock requests a fixed transmission opportunity from the management node; the management node includes a synchronization message into a transmission opportunity allocation message broadcasted periodically, and includes the fixed transmission opportunity allocated for the ordinary node into the latest transmission opportunity allocation message, and then sends the message to the ordinary node; when the ordinary node receives the synchronization message, the ordinary node sends a delay measurement request message on the fixed transmission opportunity allocated. The invention reduces the interval between the sending timestamp of an IEEE 1588 message and the actual time of arrival at the power line network of the IEEE 1588 message, and improves the precision of IEEE 1588 clock synchronization.
Inventors:
WU DONGLING (CN)
CAO HAIPING (CN)
SHANG RUI (CN)
CAO HAIPING (CN)
SHANG RUI (CN)
Application Number:
PCT/CN2010/074337
Publication Date:
December 29, 2010
Filing Date:
June 23, 2010
Export Citation:
Assignee:
ZTE CORP (CN)
WU DONGLING (CN)
CAO HAIPING (CN)
SHANG RUI (CN)
WU DONGLING (CN)
CAO HAIPING (CN)
SHANG RUI (CN)
International Classes:
H04B3/54; H04J3/06
Domestic Patent References:
| WO2008056366A2 | 2008-05-15 |
Foreign References:
| CN101447806A | 2009-06-03 | |||
| US6907472B2 | 2005-06-14 |
Other References:
ZHAO, SHANGLIN ET AL.: "Research of Time Synchronization in Digital Substation Based on IEEE 1588", POWER SYSTEM TECHNOLOGY, vol. 32, no. 21, November 2008 (2008-11-01), pages 98 - 99
Attorney, Agent or Firm:
AFD CHINA INTELLECTUAL PROPERTY LAW OFFICE (8 Xue Qing Rd. Haidian, Beijing 2, CN)
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