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The TCP “Adaptive-Selection” Concept

机译：TCP“自适应选择”概念

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摘要

The rapidly increasing importance of wireless communications (including satellite), together with the rapid growth of high speed networks, pose new challenges to transmission control protocol (TCP). Among them, the most prominent are long round trip times (RTTs), not negligible packet error rates (PER), and very large bandwidths. To overcome them, a wide variety of TCP enhancements has been presented in the literature with different purposes and capabilities. However, as most proposals aim to address different impairments, they result optimized for specific network environments. Therefore, given the increasing level of heterogeneity of present and future networks, the choice of “the best” TCP enhancement seems a quite irresolvable problem, depending on the characteristics of the specific connections. The TCP adaptive-selection concept, presented and discussed in this paper, aims to circumvent this problem by providing an alternative approach that challenges at the root the idea that only one TCP enhancement must be adopted, not only on the whole network in general, but also on the same server machine. In fact, by extending the concept that underlies adaptive coding and modulation (ACM) to transport layer, TCP adaptive-selection envisages the concurrent adoption of different TCP versions on the same server, the better to match the different impairments present on different connections. The implication of this novel approach, as well as the possible criteria to be adopted for the TCP selection, are deeply discussed in this paper, where a particular emphasis is given to the “dynamic” TCP adaptive-selection variant. Preliminary results, referring to a simple network topology, chosen to enlighten the mechanism of the TCP adaptive-selection technique, are also provided. They are quite encouraging and justify the following remarks on feasibility and the discussion of some implementation proposals.
机译：无线通信（包括卫星）的重要性迅速提高，以及高速网络的迅速发展，对传输控制协议（TCP）提出了新的挑战。其中最突出的是往返时间长（RTT），不可忽略的分组错误率（PER）和非常大的带宽。为了克服它们，文献中已经提出了具有不同目的和功能的各种TCP增强功能。但是，由于大多数建议旨在解决不同的损害，因此它们针对特定的网络环境进行了优化。因此，鉴于当前和未来网络的异构性水平越来越高，根据特定连接的特性，选择“最佳” TCP增强似乎是一个无法解决的问题。本文提出和讨论的TCP自适应选择概念旨在通过提供一种替代方法来规避此问题，该方法从根本上挑战了必须采用一种TCP增强功能的想法，这不仅适用于整个网络，而且适用于整个网络。也在同一台服务器上。实际上，通过将自适应编码和调制（ACM）基础的概念扩展到传输层，TCP自适应选择可以设想在同一服务器上同时采用不同的TCP版本，从而更好地匹配不同连接上存在的不同损害。本文深入讨论了这种新颖方法的含义以及可能采用的TCP选择标准，其中特别强调了“动态” TCP自适应选择变量。还提供了有关简单网络拓扑的初步结果，这些结果被选择来启发TCP自适应选择技术的机制。它们令人鼓舞，并证明了以下关于可行性的评论以及对一些实施建议的讨论。

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