Data communications on domestic low-voltage powerlines benefit from a ubiquitous and already existent infrastructure. Nevertheless, high-speed communications on this environment faces obstacles such as attenuation and noise. The HomePlug standard defines MACand PHY-layer protocols for home electrical wiring networks. Its MAC protocol has introduced the deferral counter (DC) mechanism, which ada...

The IEEE 802.15.4 MAC [1] standard defines the channel access for low-rate, low-power communication applications such as Wireless Sensor Networks but does not differentiate between high or low priority data. We study few priority based service differentiation mechanisms which distinguish between such data for each and every device, and also let high priority have better channel access as compar...

In this paper, we propose and evaluate an efficient multiaccess protocol for cell-based wireless networks. Our protocol addresses the problems in existing random-access protocols for wireless networks: long-term fairness as well as short-term fairness in accessing a shared channel and the detection of hidden and exposed collisions. Our proposed protocol is a limited contention protocol in which...

Qualité de service dans les réseaux locaux sans-fil (Quality of service in wireless local area networks) Date de soutenance: 7 octobre 2002 Composition du jury: Thèse préparée au sein du projet PLANETE de l'INRIA Rhône-Alpes Abstract IEEE 802.11 wireless networks are widely used to connect to the Internet due to their low cost, easy deployment and mobility support. In this thesis we deal with f...

In recent years, wireless ad hoc networks have become increasingly popular in both military and civilian applications due to its capability of building networks without the need for a pre-existing infrastructure. While a number of studies have been carried out to study the performance of IEEE 802.11 DCF in single-cell wireless LANs, the analysis of IEEE 802.11 DCF in multi-hop wireless networks...

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ABSTRACT. The IEEE 802.11 protocol for Wireless Local Area Networks adopts a CSMA/CA protocol with exponential backoff as medium access control technique. As the throughput performance of such a scheme becomes critical when the number of mobile stations increases, in this paper we propose an Adaptive Contention Window mechanism, which dynamically selects the optimal backoff window according to ...

In this paper, we derive, based on the analytical model developed by Cali et al., a multi-class model to study how to adaptively tune all the parameters in IEEE 802.11e EDCA and support service differentiation in WLANs. Through analytical modeling, we demonstrate that by assigning appropriate different transmission probabilities (or contention window sizes) to stations of different classes, it ...