TCP Fairness Issues in IEEE 802.11 Networks: Problem Analysis and Solutions Based on Rate Control
TCP Fairness Issues in IEEE 802.11 Networks: Problem Analysis and Solutions Based on Rate Control
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DOI：
10.1109/twc.2007.348331
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发表时间：
2007-04
影响因子：
10.4
通讯作者：
N. Blefari-Melazzi;A. Detti;I. Habib;A. Ordine;S. Salsano
中科院分区：
文献类型：
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作者：
N. Blefari-Melazzi;A. Detti;I. Habib;A. Ordine;S. Salsano
在本文中，我们研究的问题，保持公平性的TCP连接在无线局域网（WLAN）的基础上IEEE 802.11标准。802.11的当前实现使用所谓的分布式协调功能（DCF），其向所有站点提供类似的介质访问优先级。虽然这种操作模式确保了在MAC层对介质的公平访问，但它没有提供任何用于确保TCP连接之间的公平性的规定。TCP的不公平性可能导致性能的显著下降，从而导致用户感知到不满意的服务质量。我们提出并分析了两种解决方案，能够使TCP公平性与最小的额外复杂性。所提出的解决方案是基于在两种模式下利用速率控制机制：静态或自适应。它们不需要修改MAC层或网络层的现有标准。因此，它们与现有设备完全兼容。我们的性能分析结果证明，与现有方法相比，我们提出的解决方案在实现TCP公平性方面是有效的。我们还在一个特设的实验测试平台上实现了所提出的解决方案，并进行了测量，以证明我们的方法和结果的有效性
In this paper, we study the problem of maintaining fairness for TCP connections in wireless local area networks (WLANs) based upon the IEEE 802.11 standard. Current implementations of 802.11 use the so-called distributed coordination function (DCF), which provides similar medium access priority to all stations. Although this mode of operation ensures fair access to the medium at the MAC level, it does not provide any provisions for ensuring fairness among the TCP connections. TCP unfairness may result in significant degradation of performance leading to users perceiving unsatisfactory quality of service. We propose and analyze two solutions that are capable of enabling TCP fairness with minimal additional complexity. The proposed solutions are based on utilizing a rate-control mechanism in two modes: static or adaptive. They do not require modifying existing standards at the MAC or network layers. Hence, they are fully compatible with existing devices. Our performance analysis results prove the efficaciousness of our proposed solutions in achieving TCP fairness compared to existing approaches. We have, also, implemented the proposed solutions in an ad-hoc experimental test-bed, and performed measurements to demonstrate the validity of our approach and results