Patent ID: 8930484
Filing Date: 2015-01-06
Classification: H04J,H04L,H04W

Abstract:
1. A method, performed by a networked slave device, for synchronizing a local clock of the networked slave device with respect to a master clock of a master device, the method including: (a) providing a group of probe frames to the master device, thereby to receive responses in respect of at least a selection of these probe frames, wherein each response includes data for allowing determination of an estimated clock offset, wherein the master device has access to observe a global clock value for a wireless network, and wherein the slave device and the master device are connected to different communication media; (b) filtering the responses, thereby to identify one or more best responses for the group of probe frames; (c) repeating steps (a) and (b) for successive groups of probe frames thereby to identify a respective one or more best responses for the successive groups of probe frames; (d) selectively calculating estimated clock offset values using the one or more best responses in respect of each group of probe frames to determine a relative clock offset drift based on: (e) repeatedly adjusting the local clock of the networked slave device based on calculations of the relative clock offset drift.