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Queue Model Analysis for Spectrum-Sharing Cognitive Systems Under Outage Probability Constraint

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Abstract

This article investigates the behavior of the cognitive queueing system in a spectrum-sharing environment under the primary outage probability constraint. The queueing model is investigated under two cognitive transmit modes. A variable transmit rate that is equal to the cognitive channel’s capacity is first revisited, then the case of constant transmit rate is considered. Both transmit modes are found to lead to an \(M/G/1\) queueing model. The performance measures of the cognitive queue under these two modes are investigated and numerically compared. The performance measures include the mean transmit rate, mean service time, server utilization, mean waiting and transit times of the packets in the queue, mean number of waiting and transit packets in the queue, mean duration of the server’s busy period, and mean number of packets served during the server’s busy period. The effects of changing the primary outage probability constraint and the primary transmit rate on the performance measures are investigated as well.

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Notes

  1. Part of Sect. 3.1 appeared in [18], and it is provided here for completeness.

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Correspondence to Abdallah K. Farraj.

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Farraj, A.K. Queue Model Analysis for Spectrum-Sharing Cognitive Systems Under Outage Probability Constraint. Wireless Pers Commun 73, 1021–1035 (2013). https://doi.org/10.1007/s11277-013-1245-2

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