CCR: A Novel MAC Scheme with Constant-Time Contention Resolution for WLAN
Abichar, Zakhia G. and Chang, J. Morris (2004) CCR: A Novel MAC Scheme with Constant-Time Contention Resolution for WLAN. Iowa State University, Ames, Iowa 50011.
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Designing an efficient medium access control (MAC) scheme is a challenging task in the field of wireless MAC protocols. Often in the known schemes, one of the important performance metrics is enhanced at the expense of another. In this paper, we present a distributed MAC scheme with two main features: 1) the scheme can resolve the contention in a constant number of time slots, hence the name constant-time contention resolution (CCR) and 2) the collision rate that is exhibited by the scheme is very low and can eventually be driven to zero. The simulation results show that CCR outperforms the IEEE 802.11 DCF scheme in all the essential performance metrics: 1) CCR achieves a higher throughput by up to 55%, 2) reduces the collision rate by up to 84%, 3) reduces the worst-case delay by up to 89% and 4) exhibits a better fairness metric.
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