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Träfflista för sökning "WFRF:(Karlsson Viktoria) srt2:(2002-2004)"

Sökning: WFRF:(Karlsson Viktoria) > (2002-2004)

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1.
  • Dán, György, et al. (författare)
  • Analysis of the Packet Loss Process for Multimedia Traffic
  • 2004
  • Ingår i: Intl. Conference on Telecommunication Systems Modeling and Analysis.
  • Konferensbidrag (refereegranskat)abstract
    • In the case of multimedia traffic, like VBR video, the average loss probability is not sufficient to investigate the effects of loss on perceived visual quality, but it is difficult to analytically model the queuing behavior for such traffic. It has been shown that in the case of realtime communications, for which small buffers are used for delay reasons, short range dependence dominates the loss process and so the Markovmodulated Poisson process (MMPP) might be a reasonable source model. In this paper we present an exact mathematical model for the loss process of an MMPP+M/D/1/K queue; we validate it via simulations and compare it to other mathematical models, like the MMPP+M/M/1/K and the Gilbert model, and to simulations with real MPEG-4 video traces. We conclude that the other models give accurate results only in a small set of network scenarios, while our model can capture the loss process of VBR video sufficiently well in most cases. This makes it possible to analyze the effects of forward error correction on transmission quality in various network scenarios.
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2.
  • Más, Ignacio, et al. (författare)
  • Probe-Based Admission Control for Multicast
  • 2002
  • Ingår i: Tenth IEEE International Workshop on Quality of Service, 2002. - 0780374266 ; , s. 99-105
  • Konferensbidrag (refereegranskat)abstract
    • End-to-end measurement based admission controls (MBAC) have recently been proposed to support quality of service for real-time transfer of data. All these designs share the idea of decentralizing the admission decision by requiring each end host to probe the network before the transmission. These schemes are solely targeted at unicast communications, while multicast data has not yet been addressed. In this paper we study a probing procedure to perform admission decisions for multicast senders and receivers. The admission control offers a reliable upper bound on the packet loss for the multicast session even with short probe phase durations (e.g. half a second). Our probing mechanism only requires the routers to differentiate between two classes of packets: high priority data and low priority probes. Simulation results of the performance of the procedure are presented and evaluated.
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  • Resultat 1-2 av 2
Typ av publikation
konferensbidrag (2)
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refereegranskat (2)
Författare/redaktör
Fodor, Viktoria (2)
Karlsson, Gunnar (2)
Dán, György (1)
Mas, Ignacio (1)
Lärosäte
Kungliga Tekniska Högskolan (2)
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Engelska (2)
Forskningsämne (UKÄ/SCB)
Teknik (2)

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