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A novel dynamic contention window control scheme is presented in this paper to improve the performance and energy efficiency of IEEE 802.11-based CSMA/CA DCF wireless networks operating in ad-hoc mode. The number of competing nodes in physical carrier sense systems is one of the major impacts on DCF performance and on the energy consumed. A new approach in presented in this paper is using a cross-layer framework to alleviating the problem in both MAC and PHY layers, which attempts to improve the performance and energy efficiency by controlling the contention window size in the MAC layer according to the number of competing nodes, and the length of the MPDU (MAC Protocol Data Unit) payload according to the physical channel condition in the PHY layer.
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