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A rise in numbers of large band-with-delay product links and an increasing heterogeneity of IP networks bring new challenges for the existing congestion control mechanisms. Congestion control mechanisms are traditionally end-to-end oriented. This makes them slow to react on high delay links and inaccurate if the flow traverses heterogeneous network segments that have different jitter, or packet loss rates. Furthermore, the slow-start which TCP uses as part of its congestion control is slow to react on high band-with-delay product links and makes it hard for short-lived flows to develop fully.
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