Improvement of TCP Reno Congestion Control Protocol

TCP Reno increases its congestion window exponentially during the phase of initial slow start. This leads a series of problems. For this reason, a piecewise mathematical function model which is symmetrical about midpoint is proposed. The growth rate of congestion window is accelerated at first and the growth rate of congestion window slows down at last during the phase of slow start so that it can smoothly transit to the phase of congestion avoidance. The algorithm also makes use of the bottleneck link based on the measurement method to calculate the network bandwidth so that the slow start threshold is set to the network bandwidth. Its congestion window, throughput, friendliness is assessed and validated by NS2 simulation. The new algorithm can effectively reduce the losses for network transmission of packets and decrease the number of network jitter. Copyright © 2014 IFSA Publishing, S. L.