Comparison of various TCP Variant In Mobile Ad- Hoc Networks

Electronics ans communication

Transmission control protocol (TCP) has undergone several transformations. Several proposals have been put forward to change the mechanisms of TCP congestion control to improve its performance. A line of research tends to reduce speed in the face of congestion thereby penalizing itself. In this group are the window based congestion control algorithms that use the size of congestion window to determine transmission speed. However, TCP has the problem that the performance deteriorates especially in large-bandwidth and long-delay networks. The two main algorithm of window based congestion control are the congestion avoidance and the slow start. The aim of this study is to survey the various modifications of window based congestion control. Much work has been done on congestion avoidance hence specific attention is placed on the slow start in order to motivate a new direction of research in network utility maximization. The well known problem of TCP in high bandwidth delay product networks is that the TCP Additive Increase probing mechanism is too slow in adapting the sending rate to the available bandwidth. Various TCP Variants have been suggested for this, such as TCP Vegas, Reno, NewReno, Sack. The performances of various variants are analyzed in bidirectional scenarios using throughput and congestion window plots .In this article we present the performance comparison of existing TCP variants: TCP TCP Vegas, Reno, NewReno, Sack. for mobile ad-hoc networks. The behavior of TCP was different depending on the type of TCP variants because of improper activation or missing of congestion control. This analysis and comparisons are necessary to be aware of which TCP implementation is better for a specific scenario.

This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.