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In this paper, the authors present a survey of the congestion control proposals for TCP that preserve its fundamental host-to-host principle, meaning they do not rely on any kind of explicit signaling from the network. The proposed algorithms introduce a wide variety of techniques that allow senders to detect loss events, congestion state, and route changes, as well as measure the loss rate, the RTT, the RTT variation, bottleneck buffer sizes, and congestion level with different levels of reliability and precision. The key feature of TCP is its ability to provide a reliable, bi-directional, virtual channel between any two hosts on the Internet.
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