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TCP congestion control mechanism is highly dependent on MAC layer Back-off algorithms that predict the optimal Contention Window size to increase the TCP performance in wireless ad hoc network. This paper critically examines the impact of Contention Window in TCP congestion control approaches. The modified TCP congestion control method gives the stability of congestion window which provides higher throughput and shorter delay than the traditional TCP. Various Back-off algorithms that are used to adjust Contention Window are simulated using NS2 along with modified TCP and their performance are analyzed to depict the influence of Contention Window in TCP performance considering the metrics such as throughput, delay, packet loss and end-to-end delay.
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