A Scaling Analysis of a Star Network with Logarithmic Weights

Abstract : The paper investigates the properties of a class of resource allocation algorithms for communication networks: if a node of this network has $L$ requests to transmit and is idle, it tries to access the channel at a rate proportional to $\log(1{+}L)$. A stochastic model of such an algorithm is investigated in the case of the star network, in which $J$ nodes can transmit simultaneously, but interfere with a central node $0$ in such a way that node $0$ cannot transmit while one of the other nodes does. One studies the impact of the log policy on these $J{+}1$ interacting communication nodes. A fluid scaling analysis of the network is derived with the scaling parameter $N$ being the norm of the initial state. It is shown that the asymptotic fluid behavior of the system is a consequence of the evolution of the state of the network on a specific time scale $(N^t\!\!, t{\in}(0,1))$. The main result is that, on this time scale and under appropriate conditions, the state of a node with index $j{\geq}1$ is of the order of $N^{a_j(t)}$\!\!, with $0{\leq}a_j(t){<}1$, where $t{\mapsto}a_j(t)$ is a piecewise linear function. Convergence results on the fluid time scale and a stability property are derived as a consequence of this study.
Type de document :
Article dans une revue
Stochastic Processes and their Applications, Elsevier, In press
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Contributeur : Philippe Robert <>
Soumis le : vendredi 7 octobre 2016 - 14:27:25
Dernière modification le : mardi 26 mars 2019 - 14:07:58

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  • HAL Id : hal-01377703, version 1
  • ARXIV : 1609.04180


Philippe Robert, Amandine Veber. A Scaling Analysis of a Star Network with Logarithmic Weights. Stochastic Processes and their Applications, Elsevier, In press. 〈hal-01377703〉



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