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This paper introduces two important enhancements to the IEEE 802.11 medium access control (MAC) protocols which are not considered in the current IEEE 802.11 MAC protocol: the channel state between the transmitter and the receiver and the node queue state. Our objective is to characterize the impact of these parameters on medium access regulation, and ultimately rely on them in order to enhance the...
The distributed coordination function (DCF) aims at fair and efficient medium access in IEEE 802.11. In face of its success, it is remarkable that there is little consensus on the actual degree of fairness achieved, particularly bearing its impact on quality of service in mind. In this paper we provide an accurate model for the fairness of the DCF. Given M greedy stations we assume fairness if a tagged...
The wide usage of IEEE 802.11 based wireless LANs have led to lots of interest in providing quality of service (QoS) guarantees in such networks. 802.11e is the QoS variant of the 802.11 family of protocols. But it has a twofold drawback. First, QoS requirements relevant to a given application are always fulfilled by the "statically" associated priority. Second, resource requests of the...
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