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One arguable improvement to the IEEE
802.11 TSF performance is
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as follows:
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Suspend the
back-off timer of any pending non-beacon transmission.
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Calculate a
random delay uniformly distributed in the range between zero
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and .
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Wait for the
random delay before transmitting the beacon.
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Cancel the
remaining random delay and the pending beacon transmission
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if a beacon
arrives before the random delay timer has expired and that
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the
received beacon shows a larger time-stamp than its own.
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Send a beacon if
the random delay has expired and no beacon have
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arrived during
the delay period with a larger time-stamp.
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Upon reception
of a beacon, a node will adjust the received timestamp to
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take into
account its PHY layer delay. The receiving node will set its clock
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to the value of
the adjusted timestamp if it is later than its own. Therefore,
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all nodes will
try to gradually synchronize to the fastest clock.
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