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PERFORMANCE EVALUATION OF TCP/IP IN 802.11 WIRELESS NETWORKS

机译：802.11无线网络中TCP / IP的性能评估

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The increasing popularity of wireless networks indicates that wireless links will play an important role in future internetworks. TCP is a reliable transport protocol tuned to perform well in habitual networks made up of links with low bit-error rates. TCP was originally designed for wired networks, where loss of data is assumed to be due to congestion. However, networks with wireless and other lossy links also suffer from significant losses due to high bit error rates and handoff. But the assumption made by TCP, that loss of data is due to congestion in wireless environment causes degraded end-to-end performance. Hence a variety of mechanisms were proposed to improve TCP performance over wireless links. In this paper we wish to analyze the design and implementation of a simple protocol, called the snoop protocol that improves the performance of TCP in wireless networks. The protocol modifies the network layer software mainly at the base station and preserves end-to end TCP semantics. The main feature of this protocol is to cache packets at the base station and to perform local retransmission across the wireless links. The results of several experiments performed by implementing snoop protocol on a wireless test bed consisting of IBM think pads laptops and Pentium based personal computer running BSD/OS 2.1 from BSDI show that a reliable link layer protocol that is TCP-aware provides very good performance.
机译：无线网络的日益普及表明，无线链接将在未来的互联网络中扮演重要角色。 TCP是一种可靠的传输协议，已调整为在由低误码率的链接组成的惯用网络中表现良好。 TCP最初是为有线网络设计的，该网络中的数据丢失被认为是由于拥塞造成的。然而，由于高误码率和越区切换，具有无线链路和其他损耗链路的网络也会遭受重大损失。但是TCP所做的假设是，数据丢失是由于无线环境中的拥塞造成的，从而导致端到端性能下降。因此，提出了多种机制来改善无线链路上的TCP性能。在本文中，我们希望分析一种称为snoop协议的简单协议的设计和实现，该协议可以提高无线网络中TCP的性能。该协议主要在基站上修改网络层软件，并保留端到端TCP语义。该协议的主要特征是在基站缓存数据包，并在无线链路上执行本地重传。通过在由IBM ThinkPad笔记本电脑和运行来自BSDI的BSD / OS 2.1的基于Pentium的个人计算机组成的无线测试床上实施侦听协议而进行的几次实验的结果表明，可靠的，支持TCP的链路层协议可提供非常好的性能。

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