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A novel contention window control scheme for IEEE 802.11 WLANs
Authors:
Ali Balador,
Ali Movaghar
,
Sam Jabbehdari
,
Dimitris Kanellopoulos
Publication Type:
Journal article
Venue:
Journal of IETE Technical Review
Abstract
In the IEEE 802.11 standard, network nodes experiencing collisions on the shared medium need a mechanism
that can prevent collisions and improve the throughput. Furthermore, a backoff mechanism is used that
uniformly selects a random period of time from the contention window (cw) that is dynamically controlled
by the Binary Exponential Backoff (BEB) algorithm. Prior research has proved that the BEB scheme suffers
from a fairness problem and low throughput, especially under high traffic load. In this paper, we present a
new backoff control mechanism that is used with the IEEE 802.11 distributed coordination function (DCF).
In particular, we propose a dynamic, deterministic contention window control (DDCWC) scheme, in which
the backoff range is divided into several small backoff sub-ranges. In the proposed scheme, several network
levels are introduced, based on an introduced channel state vector that keeps network history. After
successful transmissions and collisions, network nodes change their cw based on their network levels. Our
extensive simulation studies show that the DDCWC scheme outperforms four other well-known schemes:
Multiplicative Increase and Linear Decrease, Double Increment Double Decrement, Exponential Increase
Exponential Decrease, and Linear/Multiplicative Increase and Linear Decrease. Moreover, the proposed
scheme, compared with the IEEE 802.11 DCF, gives 30.77% improvement in packet delivery ratio, 31.76%
in delay, and 30.81% in throughput.
Bibtex
@article{Balador4900,
author = {Ali Balador and Ali Movaghar and Sam Jabbehdari and Dimitris Kanellopoulos},
title = {A novel contention window control scheme for IEEE 802.11 WLANs},
volume = {30},
number = {4},
pages = {202--212},
month = {July},
year = {2012},
journal = {Journal of IETE Technical Review},
url = {http://www.es.mdu.se/publications/4900-}
}