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The effects of adaptive error correcting schemes on satellite optimized TCP.

机译：自适应纠错方案对卫星优化TCP的影响。

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摘要

With the popularity of satellite networks as a means for Internet delivery, the performance of the Transmission Control Protocol (TCP) over satellite links has been well studied. Unfortunately, the protocol has shown problems with channel utilization in such environments, which is a key performance factor for satellite operators. Performance enhancing proxies are one solution to this problem, and have been shown to provide significant improvements in channel utilization. Recent research, however, has been focused on the use of adaptive error correction in satellite networks at the lower layers, resulting in the ratification of the DVB-S2 standard. While adaptive error correction can improve channel utilization when channel conditions are good, it also results in decreases in available user bitrate during noisy periods due to the addition of parity bits. The research performed in this thesis shows that the throughput of a performance enhancing proxy suffers when adaptive error correction is introduced, resulting in up to 20% of the bandwidth being wasted during poor channel conditions. A solution involving the addition of a simple bandwidth estimation scheme to the proxy is studied, and is successful in increasing the average channel utilization in poor conditions to almost 90%. Alternatively, it is shown that the introduction of a secondary TCP flow running in parallel with the performance enhancing proxy traffic can result in near 100% channel utilization when priority queues are introduced at the satellite gateway. Tightly integrating performance enhancing proxies with the satellite gateways that employ adaptive error correction is recommended as the best solution.
机译：随着卫星网络作为Internet传递手段的普及，已经对卫星链路上的传输控制协议（TCP）的性能进行了很好的研究。不幸的是，该协议在此类环境中显示出信道利用率方面的问题，这是卫星运营商的关键性能因素。性能增强代理是解决此问题的一种方法，并且已证明可以显着提高信道利用率。但是，最近的研究集中于在较低层的卫星网络中使用自适应纠错，从而批准了DVB-S2标准。尽管在信道状况良好时自适应纠错可以提高信道利用率，但由于添加了奇偶校验位，它还会导致噪声时段内可用用户比特率的降低。本文进行的研究表明，当引入自适应纠错时，性能增强代理的吞吐量会受到影响，导致在恶劣的信道条件下浪费多达20％的带宽。研究了一种向代理服务器添加简单带宽估计方案的解决方案，该解决方案成功地将恶劣条件下的平均信道利用率提高到将近90％。替代地，示出了当在卫星网关处引入优先级队列时，与性能增强的代理业务并行运行的辅助TCP流的引入可以导致接近100％的信道利用率。建议将性能增强代理与采用自适应纠错的卫星网关紧密集成在一起，这是最佳解决方案。

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  • 作者

    Graumann, John.;

  • 作者单位

    University of Manitoba (Canada).;

  • 授予单位 University of Manitoba (Canada).;
  • 学科 Engineering Electronics and Electrical.
  • 学位 M.Sc.
  • 年度 2007
  • 页码 102 p.
  • 总页数 102
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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