FERED:Fairness Enhancement RED

Most of existing AQM schemes focus on the efficiency and stability,but neglect the fairness.Some researches have shown that TCP RTT unfairness and unfairness led by multiple congestion links widely occur in many famous AQM schemes,such as RED,REM,PI,AVQ etc.Although FRED and Balanced RED can solve unfairness problem,both of them keep per-flow state in router.Based on measurement results in real Internet,a fairness enhancement RED,in which TTL field in IP header is used to improve fairness of RED,was proposed.The results in NS2 show that FERED improves fairness greatly and inherits the merit of RED to control queue length.Moreover FERED can be implemented simply and no per-flow state is needed in router.