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WCNC 2005, New Orleans, LA, USA
WCNC 2005
The extended TSF (1)
One arguable improvement to the IEEE
802.11 TSF performance is as follows:
rSuspend
the back-off timer of any pending non-beacon transmission.
rCalculate
a random delay uniformly distributed in the range between zero and .
rWait for
the random delay before transmitting the beacon.
rCancel
the remaining random delay and the pending beacon transmission if a beacon arrives before the random delay
timer has expired and
that the
received beacon shows a larger time-stamp than its own.
rSend a
beacon if the random delay has expired and no beacon have arrived during the delay period with a larger time-stamp.
rUpon
reception of a beacon, a node will adjust the received timestamp to take into account its PHY layer delay. The
receiving node will set its clock to the value of the adjusted timestamp if it is later
than its own. Therefore, all nodes will try to gradually synchronize to the
fastest clock.
