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In the IEEE 802.11 distributed coordination function (DCF), the binary exponential backoff algorithm selects a random backoff number from a uniform probability distribution to avoid the problem of packet collision. In this article, we present a novel backoff algorithm that uses a binominal distribution rather than a uniform distribution to determine the backoff value. Simulation results show that the proposed algorithm outperforms the original IEEE 802.11 DCF algorithm.

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Existing IEEE 802.11 broadcast performance researchers assume that the time taken for a successful frame transmission is the same as that taken for an unsuccessful frame transmission. They do not consider the effects of an extended interframe space (EIFS); therefore, their analysis and simulation results are not consistent with each other. This paper considers the effects of EIFS, modifies the model proposed by Hu, and uses throughput as a performance benchmark. Results of our study show that our proposed method yields results that are closest to the simulation results.