Method and apparatus for clock synchronization in a wireless network
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United States of America Patent
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Dec 19, 2006
Grant Date -
Jan 15, 2004
app pub date -
Mar 29, 2002
filing date -
Mar 29, 2002
priority date (Note) -
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Abstract
A method and apparatus for synchronizing a local clock value in a wireless receiver receiving a data unit containing synchronization information. The method includes receiving a first data unit containing synchronization information, extracting the synchronization information from the received first data unit, copying a local free-running clock at a known reference point in time relative to the time the first data unit was received to generate a local timestamp; and calculating an offset to the free-running clock using the extracted synchronization information and the local timestamp, the calculating in non real-time, such that the sum of the calculated offset and the value of the free-running clock provides a local clock value that is approximately synchronized in time. The apparatus implementing the method is part of a node of a wireless station, and provides a time synchronization function, typically at the MAC layer.
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