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中文摘要：
随着互联网的蓬勃发展，大规模的高速下一代互联网试验环境已经形成．而最新的研究发现：在流稀疏的吉比特级高速网络试验环境中，因为TCP使用了保守的加性增加和激进的乘性减少策略来调整拥塞窗口，使得TCP协议无法充分利用丰富的带宽资源．因此各种新的高速传输协议应运而生．文章基于协议改进的不同思路对它们进行了分类描述，重点分析了这砦协议的优缺点，在归纳和总结目前研究中仍然存在的开放性问题的同时，提出了进一步的研究方向．
英文摘要：
With the rapid development of Internet, testbed of next generation Internet characterized by large scale and high speed have been constructed. Whereas some novel studies indicated that since the traditional TCP uses the conservative Additive Increase（AI） and aggressive Multiplicative Decrease（MD） mechanism to update the congestion window, it could not make full use of the abundant bandwidth resource of Gigabit high speed testbed shared by small scale flows. Thus several novel transport protocols have been proposed. The authors categorize and describe all these protocols, and emphatically analyzed the advantages and disadvantages of all kinds of mechanisms. Subsequently, the authors summarize the current existing open issues, and provide some further interesting directions.
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