A Research Of Congestion Management In DiffServ Networks Based-on Feedback

With the continuous development of Internet technology, web-based applicationstend to be diversified development, the demand based on Internet applicationsbecomes blockbuster expansion, it is accompanied by network congestion.The prevention of congestion is better than the solving of congestion. In recentyears, the researches on active queue management become the golden rule ofcongetion resolving. Among all of the active queue management algorithms, REDalgorithm has been the foucus,a variety of improvement algorithms based on REDemerge in endlessly.In order to solve the problem of RED algorithm in both response delay and lackof fairness between aggregations, this paper proposed an improvement of active queuemanagement algorithm based on feedback DiffServ network. The main works of thispaper are as follows.In this paper, through introducing the thought of early congestion noticifation,proposed the establishment of early congestion notification feedback based onDiffServ network model(DS-ECNF),and used the priority early random detectionalgorithm, the main idea of the algorithm was: in the edge node,classificaing thepackets,then aggregating, and moniting the aggregations. At the same time set updifferent degree of network congestion threshold, when forecasting a certain degree ofcongestion occurs, immediately sent to the TCP sender, who can rapidly readjust itssending rate; So as to improve the utilization rate of the link, reduce packet loss rate,and then from essentially guard against congestion.For this algorithm, this paper carries out a mathematical proof, and has somesimulation experiments through the established simulation model of NS-2.ComparingPRED algorithm with RED algorithm, the results show that the PRED algorithmreduces congestion response time of the TCP sender; guarantee the fairness among theaggregation classes.