• Mini slot time: time duration
that is at least as big as two propagation delay

• Mini slot is basis for
contention resolution

• Backoff algorithm: The first retransmission
time involves zero or one minislot

times, the second involves
0,1,2,3 minislot times and each additional slot

retransmission extends the range
the range by a factor of 2 until the maximum

range of 1210

• The average number of minislots
in a contention period is approximately e=2.71

therefore the fraction

• The average number of minislots
in a contention period is approximately e=2.71

therefore the fraction of time
that the channel is busy transmitting frames is

L/R = 1

L/R+tprop+2etprop 1+6.44a

Where a=tprop R/L

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