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Minimizing the Queue Overflow Probability Using Wireless Scheduling Algorithm

Author(s):

K Anand , K M M Institute of PG studies,Tirupathi; Mr S Muni Kumar, KMM institute of PG Studies, Tirupati

Keywords:

Wireless Scheduling Algorithm, Asymptotically Optimal Algorithms, Cellular System, Large Deviations, Queue-Overflow Probability

Abstract

In this paper, we are interested in wireless scheduling algorithms for the downlink of a single cell that can minimize the queue-overflow probability. Specifically, in a large-deviation set- ting, we are interested in algorithms that maximize the asymptotic decay rate of the queue-overflow probability, as the queue-over-flow threshold approaches infinity. We first derive an upper bound on the decay rate of the queue-overflow probability over all scheduling policies. We then focus on a class of scheduling algorithms collectively referred to as the “algorithms.” For a given, the -algorithm picks the user for service at each time that has the largest product of the transmission rate multiplied by the backlog raised to the power . We show that when the overflow metric is appropriately modified, the minimum-cost-to-overflow under the -algorithm can be achieved by a simple linear path, and it can be written as the solution of a vector-optimization problem. Using this structural property, we then show that when approaches infinity, the -algorithms asymptotically achieve the largest decay rate of the queue-overflow probability. Finally, this result enables us to design scheduling algorithms that are both close to optimal in terms of the asymptotic decay rate of the overflow probability and empirically shown to maintain small queue-overflow probabilities over queue-length ranges of practical interest.

Other Details

Paper ID: IJSRDV7I20128
Published in: Volume : 7, Issue : 2
Publication Date: 01/05/2019
Page(s): 23-26

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