Báo cáo sinh học: Fair, efficient, and power-optimized spectrum sharing scheme for cognitive radio networks

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Báo cáo sinh học: "Fair, efficient, and power-optimized spectrum sharing scheme for cognitive radio networks"EURASIP Journal on WirelessCommunications andNetworking This Provisional PDF corresponds to the article as it appeared upon acceptance. Fully formatted PDF and full text (HTML) versions will be made available soon.Fair, efficient, and power-optimized spectrum sharing scheme for cognitive radio networks EURASIP Journal on Wireless Communications and Networking 2011, 2011:201 doi:10.1186/1687-1499-2011-201 Saleem Aslam (saleem83@nrl.sejong.ac.kr) Kyung Geun Lee (kglee@sejong.ac.kr) ISSN 1687-1499 Article type Research Submission date 15 July 2011 Acceptance date 13 December 2011 Publication date 13 December 2011 Article URL http://jwcn.eurasipjournals.com/content/2011/1/201 This peer-reviewed article was published immediately upon acceptance. It can be downloaded, printed and distributed freely for any purposes (see copyright notice below). For information about publishing your research in EURASIP WCN go to http://jwcn.eurasipjournals.com/authors/instructions/ For information about other SpringerOpen publications go to http://www.springeropen.com © 2011 Aslam and Lee ; licensee Springer. This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.Fair, efficient, and power-optimized spectrum sharing scheme forcognitive radio networksSaleem Aslam and Kyung Geun Lee*Department of Information and Communication Engineering, SejongUniversity, Seoul, Republic of Korea*Corresponding author: kglee@sejong.ac.krEmail address:SA: saleem83@nrl.sejong.ac.krAbstractThe cognitive radio network (CRN) is a promising solution to the problemof spectrum scarcity. To achieve efficient spectrum utilization, cognitiveradio requires a robust spectrum sensing and spectrum sharing scheme.Therefore, spectrum sharing scheme plays a key role in achieving theoptimal utilization of the available spectrum. The spectrum sharing in CRNis more challenging than traditional wireless network. The main factorsbesides throughput and fairness which need to be addressed in spectrumsharing of CRN are primary user (PU) activity, transmission power, andvariations in the radio environment. In this article, we propose fair, efficient,and power-optimized (FEPO) spectrum sharing scheme that will incorporateall critical factors mentioned above to maximize the spectrum utilization.Simulation results show that FEPO scheme outperforms in terms oftransmission power by reducing the number of retransmissions andguarantees required level of throughput and fairness. Moreover, periodicmonitoring helps to reduce the number of collisions with PUs.Keywords: cognitive radio; spectrum sharing; primary user arrival activity;licensed user; FEPO.1. IntroductionCurrent static spectrum management schemes allocate fixed spectrum toeach existing wireless network. These schemes assign a block of thespectrum band to a particular radio access-network standard, which is furtherdivided for spectrum allocations into individual operators of this accesstechnology. However, in recent years, wireless network technology growsexponentially especially in the domain of low-cost wireless applications thatutilize the unlicensed spectrum bands. These growing applications haveraised the issue of spectrum scarcity for upcoming wireless services andstirred the researchers to find new techniques for the efficient utilization ofthe available spectrum. On the other side of the picture, the FederalCommunication Commission has reported that existing spectrum utilizationis very sparse at any given time and space [1, 2] as shown in Figure 1a.It shows the variations in power spectral density (PSD) across the radiospectrum from 0 to 6 GHz. Although there is a dense spectrum utilizationfrom 0 to 2 GHz yet there is a very sporadic spectrum utilization between 3and 6 GHz. To deal with the problem of the inefficient spectrum utilization,a new concept is evolved c ...