TCP congestion control is the most widely used congestion control protocol and a very successful one. It is a special case of Additive Increase and Multiplicative Decrease congestion control, with Increase parameter set to 1 and decrease parameter set 0.5. The paper calls Additive Increase and Multiplicative Decrease congestion control as TCP (a, b) in this report, with a standing for increase parameter and b for decrease parameter. With the aim of transmitting voice and video smoothly, TCP Friendly Rate Control (TFRC) was developed.. In this report, the performance of TCP, TCP (a, b) and TFRC in a congested network environment are compared. The effects of Window Size, Queuing mechanisms and Transmission delays are studied.
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