Improvement of Congestion window and Link utilization of High Speed Protocols Through k-NN Module
Ghani rehman · IOSR Journal of Computer Engineering · 2013
Many high speed protocols of transport layer have been comes into existence and proposed in the literature to improve the performance of Traditional TCP on high bandwidth delay links.All high speed protocols are distinguished on the basis of their incremented and decremented formulas of their respective congestion control algorithm.Many of these high speed protocols consider every packet lost as denotion of congestion in the network and cut their congestion window size.Such an approach will usually result in under utilization of available bandwidth in case of noisy channel conditions.For this reason we take a CUBIC protocol as a test case and compare its performance in noisy channel conditions and normal network conditions.The congestion window and Link utilization of the CUBIC protocol was suddenly decremented, when we incorporate a random packet drops.When the probability of packet lost incremented then both congestion window and link utilization decreases.Thus we need an intelligent technique that distinguish whether a certain packet lost is due to the congestion or any noisy conditions to recover from unnecessary cutting in the window.We have proposed a k-NN based module differentiates whether the packet drop is congestion or any other noisy error.After incorporating this technique in CUBIC protocol, we found better performance improvement.