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Allocation schemes of resources with downgrading

Published online by Cambridge University Press:  26 June 2017

Christine Fricker*
Affiliation:
INRIA
Fabrice Guillemin*
Affiliation:
Orange Labs
Philippe Robert*
Affiliation:
INRIA
Guilherme Thompson*
Affiliation:
INRIA
*
* Postal address: INRIA, 2 Rue Simone IFF, CS 42112, 75589 Paris Cedex 12, France.
** Postal address: CNC/NCA Orange Labs, 2 Avenue Pierre Marzin, 22300 Lannion, France.
* Postal address: INRIA, 2 Rue Simone IFF, CS 42112, 75589 Paris Cedex 12, France.
* Postal address: INRIA, 2 Rue Simone IFF, CS 42112, 75589 Paris Cedex 12, France.

Abstract

We consider a server with large capacity delivering video files encoded in various resolutions. We assume that the system is under saturation in the sense that the total demand exceeds the server capacity C. In such a case, requests may be rejected. For the policies considered in this paper, instead of rejecting a video request, it is downgraded. When the occupancy of the server is above some value C0 < C, the server delivers the video at a minimal bit rate. The quantity C0 is the bit rate adaptation threshold. For these policies, request blocking is thus replaced with bit rate adaptation. Under the assumptions of Poisson request arrivals and exponential service times, we show that, by rescaling the system, a process associated with the occupancy of the server converges to some limiting process whose invariant distribution is computed explicitly. This allows us to derive an asymptotic expression of the key performance measure of such a policy, namely the equilibrium probability that a request is transmitted at requested bitrate. Numerical applications of these results are presented.

Type
Research Article
Copyright
Copyright © Applied Probability Trust 2017 

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