DLB: a novel real-time QoS control mechanism for multimedia transmission
International Journal of High Performance Computing and Networking
Source models for speech traffic revisited
IEEE/ACM Transactions on Networking (TON)
Enhanced WFQ algorithm with (m,k)-firm guarantee
ICESS'04 Proceedings of the First international conference on Embedded Software and Systems
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We propose in this paper a trade-off between hardand soft real-time guarantees to maintain an acceptableQoS guarantee in overload condition and maximizeefficiently the utilization of network resources. The key ofour solution is that many real-time applications are loss-tolerant,but the loss profile must be well defined sincesuccessive packet losses are not suitable. We use theconcept of (m,k)-firm timing constraints to define a novelguaranteed loss-tolerant QoS. Therefore, we extend thebasic WFQ algorithm to take into account the firm timingconstraints to provide lower delay guarantees withoutviolating bandwidth fairness or misusing networkresources. The proposal is called (m,k)-WFQ. UsingNetwork Calculus formalism, analytic study gives thedeterministic delay bound provided by the (m,k)-WFQalgorithm for upper bounded arrival curve traffic.Theoretical results and simulations show a noticeableimprovement on delay guarantee made by (m,k)-WFQcompared to standard WFQ algorithm without muchdegrading bandwidth fairness.