چکیده:
As wireless networks with high data rate get widely deployed, improving the performance of TCP over these networks plays vital role. Wireless link losses have dramatic adverse impact on TCP performance due to the difficulty in distinguishing the congestion losses from wireless link losses. We first, studied the various existing Bandwidth Estimation Algorithms over the wireless networks. In this paper, we propose an enhanced bandwidth estimation technique with congestion control algorithms to improve TCP performance over wireless link with random loss. We propose, a new technique called TCP- BWIW to estimate the bandwidth and the congestion window is set accordingly. The performance of TCP-BWIW is analyzed, and it mitigates the Network
خلاصه ماشینی:
In this paper, we propose an enhanced bandwidth estimation technique with congestion control algorithms to improve TCP performance over wireless link with random loss.
The performance degradation of TCP in wireless networks, as in much research [3,4], is mainly due to its lack ot ability to differentiate the packet losses caused by network congestion from the losses caused by wireless link errors.
The literature proposes several Bandwidth estimation algorithms for TCP congestion control.
It uses Additive Increase and Multiplicative Decrease as the algorithm as stated in, “Introduction”, TCP Reno is incapable of handling multiple packet losses in one transmission window, which is the very likely situation in wireless links.
ABE uses the same concept of Westwood rate estimation with different implementation ABE estimates the available Bandwidth according to the Equation Eq (2) (View the image of this page) ) Where Rp, is the estimated Bandwidth when the n packet arrives, a time tq, tn- I is the previous ACK arrival time, Ln, is the size ot the data that the nth ACK and RTT is the TC’P’s Round Trip Time Delay at time tp.
The available bandwidth is the max imum rate at which a TCP connection, experiencing congestion control could transmit data.
Based on our simulation results, it is clear that during congestion, the proposed algorithm TCP-BWIW gives better perfonnance in wireless links even when it is congested CONCLUSONS In this paper, we have studied the various existing Bandwidth Estimation algorithms for TCP congestion control.
The proposed algorithm TCP-BWIW performs well during congested network.