公开(公告)号：US10135602B2

公开(公告)日：2018-11-20

申请号：US13761568

申请日：2013-02-07

Applicant: Huawei Technologies Co., Ltd.

Inventor： Guijin Xu ,  Guozhu Long ,  Ruijie Xiao ,  Zhilei Zhao ,  Xuyong Wu ,  Yuchen Jia

IPC: H04L7/00 ,  H04M11/06 ,  H04J3/06

Abstract: The present invention provides a method, an apparatus, and a system for time synchronization of an xDSL. The method includes: transmitting, by a customer premises equipment, a first symbol to a central office equipment, and obtaining time Ts2 indicating the moment that the first symbol is transmitted; receiving, by the CPE, a second symbol transmitted by the CO, and obtaining time Ts1 indicating the moment that the second symbol is received; obtaining, by the CPE obtains time Tm2 indicating the moment that the first symbol is received by the CO and time Tm1 indicating 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 Ts1, Ts2, Tm1 and Tm2; and the CPE adjusts the clock of the CPE according to the offset to achieve synchronization.

公开(公告)号：US20130148710A1

公开(公告)日：2013-06-13

申请号：US13761568

申请日：2013-02-07

Applicant: Huawei Technologies Co., Ltd.

Inventor： Guijin Xu ,  Guozhu Long ,  Ruijie Xiao ,  Zhilei Zhao ,  Xuyong Wu ,  Yuchen Jia

IPC: H04L7/00

CPC classification number: H04L7/0041 ,  H04J3/0638 ,  H04M11/062

Abstract: The present invention provides a method, an apparatus, and a system for time synchronization of an xDSL. The method includes: transmitting, by a customer premises equipment, a first symbol to a central office equipment, and obtaining time Ts2 indicating the moment that the first symbol is transmitted; receiving, by the CPE, a second symbol transmitted by the CO, and obtaining time Ts1 indicating the moment that the second symbol is received; obtaining, by the CPE obtains time Tm2 indicating the moment that the first symbol is received by the CO and time Tm1 indicating 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 Ts1, Ts2, Tm1 and Tm2; and the CPE adjusts the clock of the CPE according to the offset to achieve synchronization.

Abstract translation: 本发明提供了一种用于xDSL的时间同步的方法，装置和系统。 该方法包括：由客户驻地设备将第一符号发送到中心局设备，并获得指示发送第一符号的时刻的时间Ts2; 由所述CPE接收由所述CO发送的第二符号，并获得指示接收到所述第二符号的时刻的时间Ts1; 通过CPE获得表示由CO接收到第一符号的时刻的时间Tm2和表示CO发送第二符号的时刻的时间Tm1; CPE根据Ts1，Ts2，Tm1和Tm2计算CPE的时钟与CO的时钟之间的偏移; 并且CPE根据偏移量调整CPE的时钟以实现同步。