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As the heterogeneity of Internet traffic increases, the need to provide the necessary quality guarantees for a broad range of applications becomes more and more important. The authors propose an Active Queue Management scheme, namely Size-oriented Queue Management, which realizes service differentiation based on the Less Impact - Better Service principle. SQM manages to satisfy broadly the quality constraints of real-time applications, without compromising the performance of bulk data applications. Using packet size as criterion, they are able to distinguish time-sensitive flows and apply different dropping and scheduling policies to favor time-sensitive traffic.
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