Performance Investigation of 802.11 MAC DCF

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Executive Summary

In the 802.11 protocol, DCF can be termed as an important mechanism in order to access the medium (Channel). This scheme is a random access based scheme which has its fundamentals based upon the efficient usage of CSMA/CA protocol. The retransmission of various collided packets is effectively managed in accordance with the Binary exponential back-off rules. The waiting time of the BEB is exponentially increased by 2 after every unsuccessful transmission. Every successful transmission sets the back-off stage to initial stage and the contention window is also subsequently set to minimum regardless of any network conditions like the various n numbers of competing nodes. As the number of competing nodes rises, it can cause substantial performance deprivation as a result of the new collisions caused.

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