Scheme research of congestion management in DiffServ networks based on feedback
基于反馈的区分服务网络拥塞管理方案研究

In order to solve the problem of RED algorithm in both response delay and lack of fairness between aggregations, this paper proposed the establishment of early congestion notification feedback based on DiffServ network model, and used the priority early random detection algorithm. In the entrance of the DiffServ network it classified, aggregated and monitored the arriving packets, and set each queue according to their priority to a different queue length threshold. When the average queue length or some one queue length reached the corresponding threshold range, it sent varying degrees of congestion indication packet immediately to the TCP source. It gave some experiments in the paper using modified NS simulator. The experiments show that the algorithm ensures the congestion notification can reach the TCP source as quickly as it can, so effectively reduces the packet loss rate of the router and improves network utilization. At the same time, the algorithm can provide different priority services for different aggregations, and ensure the fairness.