Abstract
The IEEE 802.11 standard supports a variety of
modulation and coding schemes (MCSs). In 802.11-based wireless
mesh networks (WMNs) it is hence possible to adapt the link rate
to the channel conditions. In particular, smaller link rates may
be accepted for an increased spatial reuse. In an earlier study,
we showed that this effect is suitable for increasing the max-min
fair share throughput in a WMN operating with a TDMA
channel access scheme. In this work, we investigate if the use of
smaller link rates is also suitable for increasing the throughput
of a WMN using a contention-based channel access mechanism.
For this purpose, we analytically derive a guideline for link rate
assignment as protection against hidden nodes and compute the
costs and benefits of this mechanism in terms of MAC layer
efficiency. A simulation study shows however that in a medium sized
WMN this strategy is less advantageous than assumed and
allows to give advices for practical mesh network deployments.
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