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On the asymptotic optimality of greedy index heuristics for multi-action restless bandits

Part of: Hamilton-Jacobi theories, including dynamic programming Stochastic systems and control Numerical methods in calculus of variations and optimal control

Published online by Cambridge University Press:  21 March 2016

D. J. Hodge  and
K. D. Glazebrook
D. J. Hodge*
Affiliation:
The University of Nottingham
K. D. Glazebrook*
Affiliation:
Lancaster University
*
∗ Postal address: School of Mathematical Sciences, University Park, The University of Nottingham, Nottingham NG7 2RD, UK. Email address: david.hodge@nottingham.ac.uk
∗∗ Postal address: Lancaster University Management School, Bailrigg, Lancaster LA1 4YX, UK.
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Abstract

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The class of restless bandits as proposed by Whittle (1988) have long been known to be intractable. This paper presents an optimality result which extends that of Weber and Weiss (1990) for restless bandits to a more general setting in which individual bandits have multiple levels of activation but are subject to an overall resource constraint. The contribution is motivated by the recent works of Glazebrook et al. (2011a), (2011b) who discussed the performance of index heuristics for resource allocation in such systems. Hitherto, index heuristics have been shown, under a condition of full indexability, to be optimal for a natural Lagrangian relaxation of such problems in which a resource is purchased rather than constrained. We find that under key assumptions about the nature of solutions to a deterministic differential equation that the index heuristics above are asymptotically optimal in a sense described by Whittle. We then demonstrate that these assumptions always hold for three-state bandits.

Keywords

Index heuristicasymptotic optimalitymulti-action restless banditstochastic resource allocation

MSC classification

Primary: 90C40: Markov and semi-Markov decision processes
Secondary: 49L20: Dynamic programming method 49M20: Methods of relaxation type 93E20: Optimal stochastic control
Type
General Applied Probability
Information
Advances in Applied Probability , Volume 47 , Issue 3 , September 2015 , pp. 652 - 667
Copyright
Copyright © Applied Probability Trust 2015 

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