Performance Analyses of TCPWestwood
- Vasudev I Kanani
- Mr.Krunal J Panchal
TCP, Congestion Control Mechanisms
Transmission Control Protocol congestion control is backbone of the Internet stability. TCP Westwood is sender-side modification of the congestion window algorithm that improves upon the performance of Reno in wired as well as wireless networks. Westwood continuously measure the bandwidth at the TCP sender side via monitoring the rate of returning ACKs. This estimate is then used to compute congestion window and slow start threshold when congestion occurs, after three duplicate acknowledgments or after a timeout. In contrast with TCP Reno which “blindly” halves the congestion window after three duplicate ACKs, TCP Westwood attempts to select a slow start threshold and a congestion window which are consistent with the effective bandwidth used at the time congestion is experienced. We call this mechanism faster recovery. The proposed mechanism is particularly effective over wireless links where sporadic losses due to radio channel problems are often misinterpreted as a symptom of congestion by Current TCP schemes and thus lead to an unnecessary window reduction. During the last decade, several congestion control mechanisms have been proposed to improve TCP congestion control. Compared to other algorithms shows that TCP westwood is better than other algorithms.
Volume 2 Issue 2
Pages. 1746-1750
