Clock synchronization for network measurements with clock resets
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United States of America Patent
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-
Mar 20, 2007
Grant Date -
Dec 12, 2002
app pub date -
May 29, 2002
filing date -
Oct 30, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Several algorithms are provided to estimate and remove relative clock skews from delay measurements based on the computation of convex hulls. The algorithms are linear in the number of measurement points for the case with no clock resets. For the more challenging case with clock resets, i.e., the clocks are reset to some reference times during the measurement period, linear algorithms are provided to identify the clock resets and derive the best clock skew lines. The algorithms are also extended to environments in which at least one of the clocks is controlled by Network Time Protocol. These algorithms can also be extended for active clock synchronization to replace or further improve Network Time Protocol.
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