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The authors propose a Cooperative Rate Adaptation (CRA) MAC protocol based on the standard CSMA/CA protocol used in IEEE 802.11 wireless networks. The proposal provides cooperative error recovery, namely cooperative packet retransmission, while using rate adaptation. The transmission rate is selected based on the transmission rate history of the neighbours. The cooperating partner is selected based on a fuzzy logic selection algorithm. Three inputs are considered in the fuzzy system: the average transmission rate of a neighbour, the erroneous packet ratio and the acknowledged packet ratio of a neighbour. The output of the fuzzy system is the partnership probability of a neighbour.
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