Effective bandwidth and associated CAC procedure for traffic streams multiplexed over a VBR link

  • Authors:

  • A. RáCz;N. Fias;P. RáCz

  • Affiliations:

  • Traffic Analysis and Network Performance Laboratory, Ericsson Research, H-1300 Budapest 3, P.O. Box 107, Hungary;Traffic Analysis and Network Performance Laboratory, Ericsson Research, H-1300 Budapest 3, P.O. Box 107, Hungary;Traffic Analysis and Network Performance Laboratory, Ericsson Research, H-1300 Budapest 3, P.O. Box 107, Hungary

  • Venue:
  • Computer Communications
  • Year:
  • 2001

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Abstract

In this paper we introduce the definition of the effective bandwidth for traffic streams that are multiplexed over a VBR link. We assume an arbitrary traffic mix multiplexed into a FIFO buffer, which has a service rate, regulated by VBR traffic parameters as opposed to the traditional CBR server capacity. In order to analytically obtain the generalized effective bandwidth we define an equivalent queuing model, which reduces the problem of the variable service rate multiplexer to a constant rate server. Following the Large Deviation Analysis of our equivalent queuing model we derive the effective bandwidth in terms of VBR link parameters. One of the appealing features of our method is that any dimensioning, resource allocation schemes that are based on the effective bandwidth concept but originally have been devised for CBR links can be easily extended to be applicable for VBR links as well. For example, one can easily build a Connection Admission Control (CAC) algorithm for a VBR link by reusing the existing methods based on the effective bandwidth concept. In this paper we also give an example for a CAC algorithm and for other practical application scenarios.