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1、WirelessPersCommun(2014)77:23412358DOI10.1007/s11277-014-1641-2ImprovingRadioResourceUtilizationandUserLevelFairnessinOFDMAFemtocellNetworksOmidFallah-Mehrjardi·BehrouzShahgholiGhahfarokhi·HamidMala·NaserMovahhediniaPublishedonline:16February2014©SpringerScience+BusinessMe
2、diaNewYork2014AbstractPoorindoorcoverageandhighcostofcellularnetworkoperatorsareamongthemainmotivationsfortheemploymentoffemtocellnetworks.Sincefemtoaccesspoints(FAPs)andmacrocellssharesamespectrumresources,radioresourceallocationisanimpor-tantchallengeinOFDMAfemtocellnetw
3、orks.MitigatinginterferenceandimprovingfairnessamongFAPsarethemainobjectivesinpreviousresourceallocationmethods.However,themaindrawbackisthatuserlevelfairnesshasnotbeenadequatelyaddressedinthepreviousmethods,andmoreover,mostofthemsufferfrominefficientutilizationofradioresou
4、rces.Inthispaper,modelingtheproblemasagraphmulti-coloring,acentralizedalgorithmisproposedtoobtainbothuserlevelfairnessandspectrumefficiency.Thismethodemploysapriority-basedgreedycoloringalgorithminordertoincreasethereusefactorandcon-sequentlythespectrumefficiency.Moreover,in
5、situationswherethenumberofavailableOFDMresourcesisnotsufficient,theproposedmethodemploysanovelfairnessindextofairlysharethoseremainingresourcesamongusersofFAPs.Theperformancecomparisonbetweentheproposedandpreviousmethodsshowsthattheproposedmethodimprovesthebalancebetweenuse
6、r-levelfairnessandresourceutilization.Inaddition,thepresentedanaly-sesshowthatthetimecomplexityoftheproposedmethodislessthanthatofconventionalmethods.KeywordsFemtocell·Resourceallocation·Graphcoloring·Fairness·UtilizationO.Fallah-Mehrjardi(B)·B.S.Ghahfarokhi·H.MalaDepartme
7、ntofInformationTechnologyEngineering,UniversityofIsfahan,Isfahan,Irane-mail:fallah_o68@yahoo.com;fallah@eng.ui.ac.irB.S.Ghahfarokhie-mail:shahgholi@eng.ui.ac.irH.Malae-mail:h.mala@eng.ui.ac.irN.MovahhediniaDepartmentofComputerEngineering,UniversityofIsfahan,Isfahan,Irane-m
8、ail:naserm@eng.ui.ac.ir1232342O.Fallah-Mehrjardietal.1IntroductionInrecentyears,theworldh
