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Less Impact Better Service (LIBS)

A service paradigm for Internet telephony

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Abstract

We discuss a new packet service paradigm, called “Less Impact Better Service” (LIBS). In simple terms, LIBS primarily schedules packets based on the delay they cause and cancels service differentiation policies when the cumulative delay due to prioritization becomes significant for non-prioritized packets. Based on LIBS, we evaluate different service policies that prioritize small packets using different service boundaries and we show that, by and large, LIBS satisfies better a number of applications with diverse demands in delay and throughput. We emphasize on Voice over IP applications, which are delay-sensitive but also utilize small packets and rates. Among other traditional performance measures, we also measure fairness in the context of LIBS, that is, we address the question whether the delay experienced per flow is proportional to the delay caused by that flow. We obtained very promising simulation results.

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Notes

  1. even if it is measured, the precision and granularity of measurements are dubious

  2. cumulative, not per-flow

  3. it is not significant in our experiments

  4. The R-Factor is encoded in the available bits of the IP header (4 to 17 bits) [29]

  5. The value 100 represents the best voice quality

  6. additional scenarios that evaluate NCQ can be found in [21]

  7. A LIBS router incorporates a LIBS-based mechanism (i.e., one of NCQ, SNCQ or NCQ-VoIP)

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Authors and Affiliations

  1. University College London, Torrington Place, London, WC1E 7JE, UK

    Lefteris Mamatas

  2. Democritus University of Thrace, Vas. Sofias 12, 67100, Xanthi, Greece

    Vassilis Tsaoussidis

Authors
  1. Lefteris Mamatas
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  2. Vassilis Tsaoussidis
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Correspondence to Lefteris Mamatas.

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Mamatas, L., Tsaoussidis, V. Less Impact Better Service (LIBS). Ann. Telecommun. 65, 447–459 (2010). https://doi.org/10.1007/s12243-010-0175-1

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  • DOI: https://doi.org/10.1007/s12243-010-0175-1

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