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Open-loop routing of N arrivals to M parallel queues

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2 Author(s)
Milito, R.A. ; AT&T Bell Labs., Holmdel, NJ, USA ; Fernandez-Gaucherand, E.

We consider the problem of routing N arrivals to M queues in parallel when no information other than the prior statistics are available for the decision process. The work we present here differs from results in the literature in two significant ways: 1) we address the nonstationary problem of open-loop routing for N<∞ arrivals; and 2) we do not decompose the problem into an allocation phase and a routing phase, but look instead for an overall optimal policy. Exhaustive enumeration and dynamic programming turn out to be computationally infeasible approaches for realistic values of the parameters N and M. Examination of the necessary conditions for optimality as given by Pontryagin's maximum principle leads to the formulation of a policy iteration algorithm. Convergence of the algorithm in a finite number of iterations, as well as monotonicity results, are established. While only convergence to a local minimum is guaranteed, extensive computational experimentation points to its near-optimality. Some variants of the basic policy iteration algorithm are also discussed

Published in:

Automatic Control, IEEE Transactions on  (Volume:40 ,  Issue: 12 )

Date of Publication:

Dec 1995

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