Mobility

An Enhancement to TCPW BBE by Modifying the Bandwidth Estimation Using Modified EWMA

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Executive Summary

Transport Control Protocol (TCP), the dominantly used transport protocol, execute well over wired networks. As far as wireless network is brought into use, TCP should be altered to work with wireless networks. TCP is designed for congestion control in wired networks. Since congestion is not only the main problem in wireless networks, it cannot find out non-congestion related packet loss from wireless networks. TCP-Westwood is a solution to this problem for wireless networks. TCPW buffer and bandwidth estimation (TCPW BBE) a variant of TCPW, is found to perform better in congested environments. In this paper, the authors are modifying TCPW BBE with modified EWMA (Exponentially Weighted Moving Average) as bandwidth estimation technique to get accurate bandwidth and refine the congestion control algorithm.

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