IEEE 802.11 distributed coordination function (DCF): analysis andenhancement


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  • Author:  Haitao Wu Shiduan Cheng Yong Peng Keping Long Jian Ma Nat. Key Lab of Switching Technol. & Telecommun. Networks  Beijing Univ. of Posts & Telecommun.;  

  • Abstract:  Abstract Being a part of IEEE project 802, the 802.11 medium access control (MAC) is used to support asynchronous and time bounded delivery of radio data packets. It is proposed that a distributed coordination function (DCF), which uses carrier sense multiple access with collision avoidance (CSMA/CA) and binary slotted exponential backoff, be the basis of the IEEE 802.11 WLAN MAC protocols. This paper proposes a throughput enhancement mechanism for DCF by adjusting the contention window (CW) resetting scheme. Moreover, an analytical model based on Markov chain is introduced to compute the enhanced throughput of 802.11 DCF. The accuracy of the model and the enhancement of the proposed scheme are verified by elaborate simulations

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