1. Queueing analysis for preemptive transmission in underlay CRNs.
- Author
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Chen, Long, Huang, Liusheng, Xu, Hongli, and Du, Yang
- Subjects
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QUEUEING networks , *COGNITIVE radio , *APPLICATION software , *SCHEME programming language , *HOMOGENEOUS spaces , *DATA packeting - Abstract
In cognitive radio applications, there are multiple different types of message queues. Existing queueing based works in underlay cognitive radio networks mainly focused on homogeneous packets. Therefore, we propose a new underlay scheme to deal with packets' heterogeneity by assuming high-priority packets have preemptive transmission opportunities over low-priority ones, and the former ones have impatient waiting time. We model the secondary user packets' behavior as a M/M/1+GI queueing system from the perspective of the whole system, which is represented by a two-dimensional state transition graph. The reneging probability of high-priority packets and the average waiting time in two-class priority queues are analyzed. Then we extend the single-channel model to multiple channels. Under this scenario, the closed form of low-priority packets' expected system delay is derived. Simulation results demonstrate that the average waiting time of high-priority packets decreases with the growing interference power threshold and the average waiting time of the low-priority packet is proportional to the arrival rate of high-priority packet and so on. This work may lay the foundation to design efficient Medium Access Control protocols and optimize long-term system performance by carefully choosing system parameters. Copyright © 2015 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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