Correction of clock errors in a wireless station to enable reduction of power consumption
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United States of America Patent
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Feb 14, 2017
Grant Date -
Oct 15, 2015
app pub date -
Sep 17, 2014
filing date -
Apr 12, 2012
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Abstract
According to an aspect, a wireless station uses a low-frequency clock during sleep intervals and a high-frequency clock during awake intervals. Drift between the low-frequency clock and the high-frequency clock are corrected to enable aligning a wake time instant of the wireless receiver with start of beacon transmissions from an access point, and thereby to reduce power wastage. According to another aspect, errors between the clock of an access point and that of a wireless station are corrected. The wireless station computes an error between the clocks, and extrapolates the error for a sleep interval to compute a wake-up time instant. The correction and extrapolation are performed in every awake interval. Again, undesired power consumption in the wireless station is thereby reduced.
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