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TCP-UB: A New Congestion Aware Transmission Control Protocol Variant

Author(s): Wafa Elmannai | Abdul Razaque | Khaled Elleithy

Journal: International Journal of Computer Networks & Communications
ISSN 0975-2293

Volume: 4;
Issue: 4;
Start page: 129;
Date: 2012;
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Keywords: TCP UB | TCP Westwood | TCP Vegas | mobility | Bandwidth estimation.

Transmission control protocol (TCP) is a connection oriented protocol for several types of distributed applications. TCP is reliable particularly for traditional fixed networks. With emergence of faster wireless networks, TCP has been performing poorly in its original format. The performance of TCP is affected due to assorted factors including congestion window, maximum packet size, retry limit, recovery mechanism, backup mechanism and mobility. To overcome deficiency of original TCP, Several modifications have been introduced to improve network quality. The mobility is a major hurdle in degrading the performance of mobile wireless networks. In this paper, we introduce and implement new TCP variant University of Bridgeport (UB) that combines the features of TCP Westwood and Vegas. We examine the performance of TCP-UB, Vegas and Westwood using different realistic scenarios. NS2 simulator demonstrates the stability of TCP-UB as compared with TCP Vegas and Westwood in highly congested networks from the mobility point of view.
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