Adaptive Backoff Algorithm for Contention Window for Dense IEEE 802.11 WLANs

Algorithm 2

Adaptive backoff algorithm of contention window.

while (contention)

  A station observes the channel for backoff period.

  Calculate using (5).

  Estimate , following the procedure in Algorithm 1.

  Calculate using (10).

  Choose a random backoff value from the range [0, ].

  Decrement backoff timer by one when the channel is idle as DCF protocol.

  Transmit a packet when the backoff timer expires.

End