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A new technique is proposed that enables TCP to distinguish wireless packet losses from congestion related packet losses. This is achieved by introducing a wireless enhancement proxy (WENP) at layer 3 in the base station that monitors the TCP packet flows in both directions, detects wireless packet drops and provides feedback to the TCP sender using one of the TCP header reserved bits. The standard TCP Reno congestion control mechanism is modified to accommodate this effect. The scheme is modeled using the OPNET tool, and the simulation results are presented and explained. The performance of the proposed scheme is compared with that of a standard WLAN without a proxy. The results show that introducing WENP significantly improves the TCP performance in a WLAN environment.

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Format:PDFSize:225 KB
Date:Aug 2006
Pages:5

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