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Implementation and analysis of the TCP 'Adaptive-Selection' Concept in ns-2 and Linux

机译：NS-2和Linux中TCP“自适应选择”概念的实施与分析

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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. This paper aims at presenting the implementations of the TCP-AS in both Linux and ns-2. They leverage on the modular structure of the TCP Linux congestion control, which can be replicated in ns-2 by making use of the Caltech "NS-2 TCP-Linux" patch. As described in the paper, the implementation key is the insertion of an intermediate agent, called "tcp_as", between the TCP monolithic core and the TCP congestion control modules. In the second part of the paper, results of the ns-2 implementation have been cross-checked with Linux results. The analysis of data confirms both the feasibility and the performance advantages of the TCP-AS approach.
机译：现在和未来网络的异质性越来越多地对TCP构成了新的挑战。有线和无线连接（包括卫星）具有非常不同的特征，关于带宽，RTT和损耗率，将不得不共存，并在同一网络中以公平的方式竞争。这种异质性使得许多TCP增强建议之间的选择是困难的，因为它们基本上专注于单一损伤，导致不同网络环境的“优化”。为了克服这个问题，作者最近介绍了TCP自适应选择（TCP-AS）概念，这挑战了实际上应该做出一种选择的想法。本文旨在提出TCP的实现 - 如Linux和NS-2所示。它们利用TCP Linux拥塞控制的模块化结构，通过使用Caltech“NS-2 TCP-Linux”补丁，可以在NS-2中复制。如本文所述，实现密钥是插入中间代理，称为“TCP_AS”，在TCP单片核和TCP拥塞控制模块之间。在本文的第二部分中，NS-2实施的结果已通过Linux结果进行交叉检查。数据分析证实了TCP的可行性和性能优势 - 作为方法。

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