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Low throughput due to unfairness is a key problem in multi-rate wireless local
area networks. To promote fairness and hence throughput, $T^2$-Fair
groups flows according to their average data rate, provides each group fair
time allocations and ensures throughput fairness for flows in each group. Since
each group is allocated transmission times fairly, $T^2$-Fair
isolates high and low rate groups and prevents system capacity from being
degraded by low rate flows. We have derived $T^2$-Fair's performance bounds
analytically and investigated its performance using the {\it ns-2} simulator in
various scenarios with a mix of high and low rate flows.
Our results show that $T^2$-Fair is effective in isolating and providing
proportional throughput fairness to these flows.
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