Capacity with probabilistic delay constraint for voice traffic in a Rayleigh channel

  • Authors:
  • Beatriz Soret;M. Carmen Aguayo-Torres;J. Tomas Entrambasaguas

  • Affiliations:
  • Department of Ingeniería de Comunicaciones, University of Málaga, Málaga, Spain;Department of Ingeniería de Comunicaciones, University of Málaga, Málaga, Spain;Department of Ingeniería de Comunicaciones, University of Málaga, Málaga, Spain

  • Venue:
  • ICC'09 Proceedings of the 2009 IEEE international conference on Communications
  • Year:
  • 2009

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Abstract

The Capacity with Probabilistic Delay Constraint CDt,Ɛ expresses the maximum source rate that may be supported in a wireless system with a probability Ɛ of exceeding certain delay bound Dt. In [1], CDt,Ɛ was calculated for a Rayleigh channel carrying a constant rate flow. In this work, the potential of the effective bandwidth theory is shown by evaluating this constrained capacity for a variable rate source modeled as an ON-OFF process. Cross relations among ON-OFF process parameters, fading channel statistics, QoS constraints and maximum allowable mean source rate are displayed by the obtained closed-form expressions. CDt,Ɛ is measured in different scenarios to exhibit to which extent higher time-correlation of the channel response or longer ON-OFF periods are harmful to the delay behaviour, getting a lower value of the capacity CDt,Ɛ.