Packet multiplexers with adversarial regulated traffic

Srini Rajagopal, Martin Reisslein, Keith W. Ross

    Research output: Contribution to journalArticle

    Abstract

    We consider a finite-buffer packet multiplexer to which traffic arrives from several independent sources. The traffic from each of the sources is regulated, i.e. the amount of traffic that can enter the multiplexer is constrained by known regulator constraints. The regulator constraints depend on the source and are more general than those resulting from cascaded leaky buckets. We assume that the traffic is adversarial to the extent permitted by the regulators. For lossless multiplexing, we show that if the original multiplexer is lossless it is possible to allocate bandwidth and buffer to the sources so that the resulting segregated systems are lossless. For lossy multiplexing, we use our results for lossless multiplexing to estimate the loss probability of the multiplexer. Our estimate involves transforming the original system into two independent resource systems, and using adversarial sources for the two independent resources to obtain a bound on the loss probability of the transformed system. We show that the adversarial sources are not extremal on-off sources, even when the regulator consists of a peak rate controller in series with a leaky bucket. We explicitly characterize the form of the adversarial source for the transformed problem. We also provide numerical results for the case of the simple regulator.

    Original languageEnglish (US)
    Pages (from-to)239-253
    Number of pages15
    JournalComputer Communications
    Volume25
    Issue number3
    DOIs
    StatePublished - Feb 15 2002

    Keywords

    • Buffer-bandwidth tradeoff curve
    • Call admission control
    • Leaky bucket
    • Quality-of-service guarantees
    • Resource allocation
    • Statistical multiplexing
    • Worst-case sources

    ASJC Scopus subject areas

    • Computer Networks and Communications

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