Adaptive Backoff Algorithm for Contention Window for Dense IEEE 802.11 WLANs

Algorithm 1

Estimation of the number of active stations.

Step  1: Set , and set the threshold value for the collision probability .

Step  2: Calculate using (5).

Step  3: Compare with .

while ()

Estimate the number of active stations using (11).

Calculate obtained by (10) using .

Update the value using (5).

End

Step  4: Estimate the number of active stations using the updated and obtained by (11).