TCP variants - A comparative analysis for high bandwidth - delay product in mobile adhoc network

The TCP throughput deteriorates in networks with large bandwidth-delay product, and new congestion control algorithms have been proposed to address such deterioration. Traditional TCP protocols treat all packet loss as a sign of congestion. Their inability to recognize non-congestion related packet loss has significant effects on the communication efficiency. The proposed protocols such as TCP - Reno, TCP Adaptive Westwood, Scalable TCP, HS-TCP, BIC-TCP, and FAST-TCP all have some improvement in functionality over the traditional TCP protocols. The evaluation of all the variants in ad hoc network environment is done in NS-2.29. Performance of TCP variants indicates how they respond to various network parameters like propagation delay, bandwidth, round trip time (RTT) and packet sending rate etc., This analysis results in choosing the best TCP for a particular application.