A Scheme for Adapting TCP to Drastic Changes in Link Characteristics

International Conference on Mobile Ubiquitous Computing, Systems, Services and Technologies (UBICOMM'07) Pub Date : 2007-11-04 DOI:10.1109/UBICOMM.2007.4

K. Ishibashi, N. Morishima, H. Sunahara

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引用次数: 2

Abstract

The mobile environment has been improved in this decade with technologies of mobility transparency such as mobile IP (MIP) and network mobility (NEMO), plus there has been progress in wireless and device technologies. Mobility transparency makes it possible for a mobile node to change its upstream data-link without any disruption of existing TCP connections. However, these technologies do not suffice for TCP to retain its performance, since they do not hide any changes in link characteristics. In this paper, we propose a scheme which adapts TCP congestion control to link characteristics after the upstream data-link changed. This scheme is based on a (re)setting of the parameters used for TCP congestion control after a upstream data-link changed. Some strategies of how parameters are derived, and when they are set, are discussed and examined here. We also implemented the scheme and carried out emulation experiments, the results of which demonstrated the scheme can avoid a adverse affect caused by a changes in the upstream data-link and make the TCP congestion control to adapt the changes in link characteristics.

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一种使TCP适应链路特性急剧变化的方案

随着移动IP (MIP)和网络移动性(NEMO)等移动性透明技术的发展，移动环境在这十年中得到了改善，此外，无线和设备技术也取得了进展。移动透明性使得移动节点可以在不中断现有TCP连接的情况下更改其上游数据链路。然而，这些技术不足以使TCP保持其性能，因为它们不隐藏链路特征的任何变化。本文提出了一种使TCP拥塞控制适应上游数据链路变化后链路特性的方案。该方案基于在上游数据链路改变后用于TCP拥塞控制的参数的(重新)设置。本文将讨论和检查一些关于如何推导参数以及何时设置参数的策略。并进行了仿真实验，结果表明该方案可以避免由于上游数据链路变化而产生的不利影响，使TCP拥塞控制能够适应链路特性的变化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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International Conference on Mobile Ubiquitous Computing, Systems, Services and Technologies (UBICOMM'07)

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