IEEE 802.11 distributed coordination function: enhancement and analysis

Authors:
Hai Tao Wu;Yu Lin;Shi Duan Cheng;Yong Peng;Ke Ping Long
Affiliations:
National Key Lab of Switching Technology and Telecommunication Networks, Beijing University of Posts and Telecommunications, Beijing 100876, P.R. China;National Key Lab of Switching Technology and Telecommunication Networks, Beijing University of Posts and Telecommunications, Beijing 100876, P.R. China;National Key Lab of Switching Technology and Telecommunication Networks, Beijing University of Posts and Telecommunications, Beijing 100876, P.R. China;National Key Lab of Switching Technology and Telecommunication Networks, Beijing University of Posts and Telecommunications, Beijing 100876, P.R. China;National Key Lab of Switching Technology and Telecommunication Networks, Beijing University of Posts and Telecommunications, Beijing 100876, P.R. China
Venue:
Journal of Computer Science and Technology
Year:
2003

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Abstract

IEEE 802.11 Medium Access Control (MAC) is proposed to support asynchronous and time bounded delivery of radio packets. Distributed Coordination Function (DCF), which uses Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) and binary slotted exponential backoff, is the basis of the 802.11 MAC. This paper proposes a throughput enhancement for DCF by adjusting the Contention Window (CW) setting scheme. Moreover, an analytical model based on Markov chain is introduced to compute the enhanced throughput. The accuracy of the model and the enhancement of the proposed scheme are verified by elaborate simulations.