TCP-Friendly Additive Increase and Multiplicative Decrease (AIMD) congestion control protocol is proposed to support Internet heterogeneous traffic. For each round trip time, the protocol either increases its congestion window size by α packets if no congestion occurs, or decreases the window size to β times its current value when congestion signal is captured by the TCP sender. The pair of parameters (α, β) is obtained by studying the competition behavior of co-existing flows for TCP-Friendly condition. The AIMD protocols are also suitable to provide differentiated services by selecting appropriate pairs of α and β.
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