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Improving TCP Performance Over Wireless Network With Frequent Disconnections

Author(s): Purvang Dalal | Nikhil Kothari | K. S. Dasgupta

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

Volume: 3;
Issue: 6;
Start page: 169;
Date: 2011;
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Keywords: Serial Timeouts | Loss recovery | Retry Limit | Fast Retransmit | Intermittent Connectivity | Bit Error Rate | Round Trip Time

Presented in this paper is the solution to the problem that arises when the TCP/IP protocol suite is usedto provide Internet connectivity through mobile terminals over emerging 802.11 wireless links. Takinginto consideration the strong drive towards wireless Internet access through mobile terminals, theproblem of frequent disconnections causing serial timeouts is examined and analyzed, with the help ofextensive simulations. After a detailed review of wireless link loss recovery mechanism and identificationof related problems, a new scheme with modifications at link layer and transport layer is proposed. Theproposed modifications which depend on interaction between two layers (i) reduce the idle time beforetransmission at TCP by preventing timeout occurrences and (ii) decouple the congestion control fromrecovery of the losses due to link failure. Results of simulation based experiments demonstrateconsiderable performance improvement with the proposed modifications over the conventional TCP,when a wireless sender is experiencing frequent link failures.
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