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This paper proposes a mechanism named Modified Backoff (MB) mechanism to decrease the channel idle time in IEEE 802.11 Distributed Coordination Function (DCF). In the noisy channel, when Signal-to-Noise Ratio (SNR) is low, applying this mechanism in DCF greatly improves the throughput and lower the channel idle time. This paper presents an analytical model for the performance study of IEEE 802.11 MB-DCF for nonsaturated heterogeneous traffic in presence of transmission errors. First, it introduces the MB-DCF and compares its performance to IEEE 802.11 DCF with Binary Exponential Backoff (BEB).
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