A New TCP Congestion Control for Ultra High Speed Data Transfer Applications

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For realizing high speed TCP communication over Gbps class Internet backbone, which occupies the whole bandwidth of the network by itself, this research project studied a new congestion control scheme. It introduces multiple subconnections in a TCP connection and the congestion control using congestion window is performed by individual subconnections instead of TCP connection as a whole. As a result, it is expected that there are a number of conventional TCP connections even in the situation where there are only a small number of high speed TCP connections.The following research activities are done in these two years.1.Design of a new TCP congestion control algorithmBased on the consideration mentioned above, a new algorithm was studied.2.Evaluation of designed algorithmThe evaluation simulation software for the algorithm was developed on the network simulator ns-2,and the performance evaluation was done. But, a good result was not obtained.3.Modification of the algorithm and its evaluationThe reason of the bad performance seemed to be the algorithm was too eager in the retransmission. So, the algorithm was modified and re-evaluated. But, although the level of congestion was improved, the throughput was similar to the first algorithm.4.Design of the third algorithmIn order to resolve those two problems, the third algorithm was designed.