NDLI: Improving the quality of service for users in cognitive radio network using priority queueing analysis

Content Provider	IET Digital Library
Author	Bassoo, Vandana Khedun, Narvada
Abstract	Through cognitive radio (CR), unlicensed users can occupy idle spectrum bands without interference with the primary user (PU). Generally, when the arrival rate of licensed users is high, secondary users (SUs) may starve. In this study, the authors propose two models to improve the average total waiting time for the SU. They are the M/D/1 model of a PU delay system with non-pre-emptive priority and pre-emptive priority. They are compared to an M/D/1 model with PU delay. Numerical analysis and Monte Carlo simulations are performed for all results. Improvements in the average total waiting time of 13–18% for PU and 24–32% for SU in the non-pre-emptive priority scheme are obtained. In the pre-emptive priority scheme, 19–22 and 5–7% improvements are obtained for the PU and SU respectively. Furthermore, same models, but with finite buffer capacity for both users are investigated to model a real-time system. In these schemes, the system improves the average total waiting time by 20–42% for the PU and 34–42% for the CR with the non-pre-emptive priority. Similarly, the pre-emptive model shows 25–44 and 6–24% reduction in the PU and SU waiting times respectively.
Starting Page	1063
Ending Page	1070
Page Count	8
ISSN	17518628
Volume Number	10
e-ISSN	17518636
Issue Number	Issue 9, Jun (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/10/9
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2015.1054
Journal	IET Communications
Publisher Date	2016-06-09
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Arrival Rate Average Total Waiting Time Improvement Cognitive Radio Cognitive Radio Network Finite Buffer Capacity Idle Spectrum Band M/D/1 Model Monte Carlo Method Monte Carlo Simulation Nonpreemptive Priority Numerical Analysis Preemptive Priority Primary User Priority Queueing Analysis PU Delay System Quality of Service Quality-of-service Improvement Queueing Theory Radio Link And Equipment Radio Spectrum Management Radio Spectrum Usage Secondary User Statistics Wireless Communication System
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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