Research Article
A simple mechanism on MAC layer to improve the performance of IEEE 802.11 DCF
@INPROCEEDINGS{10.1109/BROADNETS.2004.13, author={Chonggang Wang and Weiwen Tang and Kazem Sohraby and Bo Li}, title={A simple mechanism on MAC layer to improve the performance of IEEE 802.11 DCF}, proceedings={1st Annual Conference on Broadband Networks}, publisher={IEEE}, proceedings_a={BROADNETS}, year={2004}, month={12}, keywords={}, doi={10.1109/BROADNETS.2004.13} }- Chonggang Wang
Weiwen Tang
Kazem Sohraby
Bo Li
Year: 2004
A simple mechanism on MAC layer to improve the performance of IEEE 802.11 DCF
BROADNETS
IEEE
DOI: 10.1109/BROADNETS.2004.13
Abstract
Based on the current standardized IEEE 802.11 distributed coordination function (DCF) protocol, this paper proposes a new efficient collision resolution mechanism, called GDCF. Our main motivation is based on the observation that 802.11 DCF decreases the contention window to the initial value after each success transmission, which essentially assumes that each successful transmission is an indication that the system is under low traffic loading. GDCF takes a more conservative measure by halving the contention window size after c consecutive successful transmissions. This "gentle" decrease can reduce the collision probability, especially when the number of competing nodes is large. We compute the optimal value for c, and the numerical results from both analysis and simulation demonstrate that GDCF significantly improve the performance of 802.11 DCF including throughput, fairness, and energy efficiency. In addition, GDCF is flexible for supporting priority access by selecting different values of c for different traffic types; it is very easy to implement it, as it does not requires any changes in control message structure and access procedures in DCF.