The recent rapid developments in network technologies have made the use of high-speed networks possible. This has enabled e-Science environment to be established on a global scale. To share and transfer the voluminous amount of data available in e-Science, high-speed transport protocols that efficiently use bandwidth have been extensively studied. However, when many high-speed transport protocols coexist on a bottleneck link, they often cannot effectively recognize congestion conditions. So that, an extraordinary traffic stream occupies bandwidth, and transfer speed of other traffic streams goes down. We address this problem by proposing a buffer control method that mitigates the effects of contention between high-speed transport protocols. It estimates inflow rates and controls outflow rates at a router, and drops packets in accordance with a discarding probability value before the buffer becomes full. Simulation results confirm that our method works well functionally.
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