公开(公告)号：US09755820B2

公开(公告)日：2017-09-05

申请号：US15084031

申请日：2016-03-29

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Wang Liu ,  Yongliang Liu

IPC: H04L7/00 ,  H04L7/04 ,  H04J3/06 ,  H03L7/07

CPC classification number: H04L7/042 ,  H03L7/07 ,  H04J3/0691 ,  H04L7/0037

Abstract: Embodiments of the present invention provide a frequency offset detection method and apparatus. The frequency offset detection method in the present invention includes: calibrating a frequency offset of a clock signal output by a local crystal oscillator of a network element device, and performing frequency offset detection on a tracked reference clock signal by using the calibrated clock signal output by the local crystal oscillator. The embodiments of the present invention solve a problem in the prior art that a detection result for a frequency offset of a reference clock signal is inaccurate because of an existence of a frequency offset of a local crystal oscillator and a parameter drift caused by aging, thereby improving detection precision without replacing hardware.