R-m,k-firm : A novel QoS Scheme for Real-time Flow Guarantee in NetworksReport as inadecuate




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1 TRIO - Real time and interoperability INRIA Lorraine, LORIA - Laboratoire Lorrain de Recherche en Informatique et ses Applications

Abstract : This paper presents a new real-time Quality of Service QoS guarantee scheme called Relaxed m,k-firm denoted by R-m,k-firm. The problem we deal with is that for a set of streams e.g. sources which generate packets sharing a common resource, deterministic m,k-firm guarantee of each stream can lead to an arbitrarily low resource utilization, making m,k-firm useless for QoS guarantee in a network. The goal of the proposed constraint relaxation is to achieve a higher resource utilization while still deterministically guarantee the m,k-firm constraint. As with m,k-firm guarantee, R-m,k-firm provides the guarantee on the transmission delay of at least m out of any k consecutive packets mk. Instead of imposing a transmission delay constraint per packet i.e. deadline, R-m,k-firm only considers a global transmission delay constraint on a group of any k consecutive packets. This constraint relaxation may be acceptable for a large class of soft real-time applications such as multimedia flow transmissions in the networks for which occasional packet drops can be tolerated. One of the possible implementations of the R-m,k-firm scheme is also provided with the development of a new traffic control mechanism, called Double-Leaks Bucket DLB. DLB selectively drops a proportion of packets of a flow or an aggregated-flows in case of the network congestion while still guaranteeing the R-m,k-firm constraint. The sufficient condition for this guarantee is given for configuring the DLB parameters. Finally a comprehensive discussion on the existing constraint relaxation strategies is developed showing the generality of the R-m,k-firm scheme.





Author: Jian Li - Ye-Qiong Song -

Source: https://hal.archives-ouvertes.fr/



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