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The increasing level of heterogeneity of present and future networks poses new challenges to TCP. Wired and wireless connections (including satellite) with very different characteristics, concerning bandwidth, RTT and loss rate, will have to co-exist and to compete, possibly in a fair way, in the same network. This heterogeneity makes difficult the choice between the many TCP enhancement proposals, as they basically are focused on single impairments, resulting "Optimized" for different network environments. To overcome this problem the authors have recently presented the TCP-Adaptive Selection (TCP-AS) concept, which challenges the very idea that one choice should actually be made.
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