The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 14, 2013
Filed:
Jul. 15, 2011
Guijin Xu, Guangdong, CN;
Guozhu Long, Guangdong, CN;
Ruijie Xiao, Guangdong, CN;
Zhilei Zhao, Guangdong, CN;
Xuyong Wu, Guangdong, CN;
Yuchen Jia, Guangdong, CN;
Guijin Xu, Guangdong, CN;
Guozhu Long, Guangdong, CN;
Ruijie Xiao, Guangdong, CN;
Zhilei Zhao, Guangdong, CN;
Xuyong Wu, Guangdong, CN;
Yuchen Jia, Guangdong, CN;
Huawei Technologies Co., Ltd., Shenzhen, CH;
Abstract
The present invention provides a method, an apparatus, and a system for time synchronization of an xDigital Subscriber Line (xDSL). The method includes: transmitting, by a customer premises equipment (CPE), a first symbol to a central office (CO) equipment, and obtaining time Tsindicating the moment that the first symbol is transmitted; receiving, by the CPE, a second symbol transmitted by the CO, and obtaining time Tsindicating the moment that the second symbol is received; obtaining, by the CPE obtains time Tmindicating the moment that the first symbol is received by the CO and time Tmindicating the moment that the second symbol is transmitted by the CO; the CPE calculates an offset between a clock of the CPE and a clock of the CO according to Ts, Ts, Tm, Tmand a delay of the CPE; and the CPE adjusts the clock of the CPE according to the offset to achieve synchronization. According to the present invention, by adjusting the time of the clock of the CPE and the time of the clock of the CO, the offset between the clock of the CPE and the clock of the CO can be obtained accurately to effectively achieve time synchronization between the CPE and the CO.