Based On Network Quality Of Service Of The Red Algorithm To Improve The Strategy

With the unceasing development of Internet scale, people have an ever-growing demand for the quality of service of computer networks (QoS). And nowadays, in the high-speed network multimedia's application not only has the very high bandwidth requirement to the network, but also requires intelligence transmission low delay and the low vibration and so on, needs to provide the end_to_end control and guarantee of QoS. The network congestion is a great factor to affect the network quality of service , so the implementation congestion control is prerequisite for other QoS mechanism normal work .At present, congestion control mechanism of Internet and quality of service are the central issues of the current research.The active queue management mechanism( AQM) is, which the IETF recommends, the essential technology based on the router congestion control, which combines with the TCP end-to-end congestion control , being a main method to solve the congestion control question of the present Internet .By evaluation the state of network and foretelling the appearance of the congestion, AQM can drop the packet purposefully so that the sending end can be informed of the state of network and then adjust it's sending rate. But the current algorithms aren't still perfect in terms of response's time, stability and sensitivity to the environment and so forth. In this paper, the advantages and disadvantages of the existent algorithms are concluded based on analysing the current prevalent congestion control algorithms RED in detail, an improved algorithm NMRED of active queue management (AQM) is proposed.As a result, NMRED algorithm has made the modifications of original RED algorithm in the computational method of probability of packet drop -Pb and the adapting of the parameter -maxp. First, based on the fuzzy math, instead of the probability function of drop, we use the membership function of ascend half-cauchy distribution. Original RED algorithm based on the average queue size of the buffer...