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首页> 外文会议>International IFIP-TC6 Networking Conference(NETWORKING 2004); 20040509-20040514; Athens; GR >Improving the Performance of TCP in the Presence of Interacting UDP Flows in Ad Hoc Networks
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Improving the Performance of TCP in the Presence of Interacting UDP Flows in Ad Hoc Networks

机译：在Ad Hoc网络中存在交互UDP流的情况下提高TCP性能

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摘要

In this paper, we study how fairness affects the performance of TCP over ad hoc networks with IEEE 802.11 at the MAC layer. The problem addressed is that the throughput of TCP flows degrades severely in the presence of heavily loaded UDP flows. Our contribution is twofold. First, we identify the factors affecting the TCP throughput by providing a micro-analysis of the performance at a level of detail that is not seen in previous studies. The intuition obtained from the first part leads us to our second contribution. We propose and study the use of per flow fairness through a mechanism we call backpressure. Backpressure improves the performance of TCP flows in the presence of heavy UDP flows. In fact, in some cases, this increased TCP throughput does not affect the throughput of UDP flows. We find that backpressure can increase the TCP throughput by as much as 95%. An advantage of backpressure is that it does not require any changes to the existing TCP or IEEE 802.11 protocols.
机译：在本文中，我们研究了公平性如何影响在MAC层具有IEEE 802.11的ad hoc网络上TCP的性能。解决的问题是，在存在大量UDP流的情况下，TCP流的吞吐量会严重降低。我们的贡献是双重的。首先，我们通过对性能进行微观分析来确定影响TCP吞吐量的因素，而这些细节在以前的研究中没有见过。从第一部分获得的直觉将我们引向第二点贡献。我们提出并研究通过称为背压的机制对每流公平性的使用。在存在大量UDP流的情况下，背压可提高TCP流的性能。实际上，在某些情况下，这种增加的TCP吞吐量不会影响UDP流的吞吐量。我们发现背压可以将TCP吞吐量提高多达95％。背压的优点是它不需要对现有的TCP或IEEE 802.11协议进行任何更改。

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