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arXiv 1002.2403cs.NI
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随机丢失对移动Ad hoc网络(IEEE 802.11)中TCP性能影响的仿真分析

Impact of Random Loss on TCP Performance in Mobile Ad hoc Networks (IEEE 802.11), A Simulation-Based Analysis

Shamimul Qamar, Kumar Manoj

摘要:

最初,TCP的设计理念是有线网络通常是可靠的,传输中的任何段丢失都是由于网络拥塞而不是不可靠的介质(假设损坏导致的数据包丢失远小于1%)。这个概念在网络的无线部分不成立。无线链路是高度不可靠的,由于许多因素,它们总是丢失段。很少有论文使用TCP的MANET。在本文中,试图证明使用TCP的变种(塔霍和雷诺)的数据包丢失,由于随机噪声引入的MANET。对于本分析,通过引入0%、10%、20%和30%的噪声,对TCP变体(Tahoe和Reno)进行了模拟。TCP的变种的比较是通过运行模拟0,10,20和30%的数据包丢失,由于在传输链路中的噪声和吞吐量和拥塞窗口的影响进行了检查。在模拟过程中,我们观察到,当多个数据段丢失时,吞吐量会下降,此外,我们还观察到,在TCP变体(Reno)的情况下,吞吐量在1%时更好(图5),这意味着网络具有短的错误突发和低BER,仅导致一个数据段丢失。当由于链路的易出错性质而丢失多个段时,Tahoe的性能优于Reno(图13),与Reno相比,它显著节省了时间(64.28%)(表4)。为了更好地了解这些TCP变体及其执行功能的方式,已经使用ns 2模拟器运行了几次模拟。最后,我们讨论这些TCP版本是否可以用于移动Ad hoc网络。

英文摘要:

Initially TCP was designed with the notion in mind that wired networks are generally reliable and any segment loss in a transmission is due to congestion in the network rather than an unreliable medium (The assumptions is that the packet loss caused by damage is much less than 1 percent) . This notion doesnt hold in wireless parts of the network. Wireless links are highly unreliable and they lose segments all the time due to a number of factors. Very few papers are available which uses TCP for MANET. In this paper, an attempt have been made to justify the use of TCP variants (Tahoe and Reno) for loss of packet due to random noise introduces in the MANET. For the present analysis the simulation has been carried out for TCP variants (Tahoe and Reno) by introduces 0, 10, 20 and 30 percent noise. The comparison of TCP variants is made by running simulation for 0, 10, 20 and 30 percent of data packet loss due to noise in the transmission link and the effect of throughput and congestion window has been examined. During the simulation we have observed that throughput has been decreased when a drop of multiple segments happens, further we have observed in the case of TCP variant (Reno) throughput is better at 1 percent (Figure 5) which implies a network with short burst of error and low BER, causing only one segment to be lost. When multiple segments are lost due to error prone nature of link, Tahoe perform better than Reno (Figure 13), that gives a significant saving of time (64.28 percent) in comparison with Reno (Table 4). Several simulations have been run with ns 2 simulator in order to acquire a better understanding of these TCP variants and the way they perform their function. We conclude with a discussion of whether these TCP versions can be used in Mobile Ad hoc Network.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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