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Deploying TCP Vegas in Optical Burst Switching (OBS) networks reduces the performance of the network due to the misunderstanding of the congestion in the networks. In OBS networks, beside congestion in the network we have burst contention which causes the packet lost in the network. When the traffic is low and a contention happens, TCP Vegas assumes the contention as the congestion and reduces the size of congestion window (cwnd) wrongly. If we can find the best numbers for packets and wavelengths we can optimize our network. For this purpose we use CWND algorithm. By using CWN algorithm we obtain the best number of wavelengths for data and packet controls to have the best performance in the network and we can increase number of packets that are sent. In this scheme we try to minimize the effect of the contention on the performance of the network. The simulation results show that this algorithm increases the performance of the network and prevent wasting the bandwidth in the network.
Optical Burst Switching, TCP Vegas, Transport Control Protocol (TCP), WDM (Wavelength Division Multiplexing).
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