Adaptive EDCF and its
implementation:
In this
work, we proposes an adaptive service differentiation scheme called AEDCF
(Adaptive EDCF) for QoS enhancement in 802.11 wireless ad-hoc networks.
In our scheme, relative priorities are provisionedby adjusting the size
of the Contention Window of each traffic class taking into account both
applications requirements and network conditions. We evaluate the performance
of AEDCF and compare it with the EDCF scheme proposed in the upcoming standard
of 802.11e. Results show that AEDCF outperforms the basic EDCF, especially
at high traffic load conditions. Indeed, our scheme increases the medium
utilization ratio and reduces for more than 50% the collision rate. While
achieving delay differentiation, the overall goodput obtained is up to
25% higher than EDCF. Moreover, the complexity of AEDCF remains similar
to the EDCF scheme,
enabling the design of cheap implementations.
Copyright: You can download our ns codes
freely for academic use, but please cite our contribution when you
use it:
ns-802.11.AEDCF
source codes
Qiang Ni, Oct .30, 2002
|