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1、(学习机)EnergysavingmechanismintheIEEE802.16ewirelessMANIEEECOMMUNICATIONSLETTERS,VOL.9,NO.7,JULY2005595EnergySavingMechanismintheIEEE802.16eWirelessMANYangXiao,SeniorMember,IEEEAbstract—Inthispaper,westudyenergyconsumptionfortheIEEE802.16ebroadbandwirel
2、essaccess(BWA)network.Amobilesubscriberstationgoestosleep?modeafternegationswiththebasestationandtemporarilywake-upperiodicallyforashortintervaltocheckwhetherthereisdownlinktraf?ctoittodecidewhetheritgoestowake?modeorcontinuestobeinthesleep-mode.Thesl
3、eepintervalisincreasedexponentiallyuponnoarrivaltraf?c.Weanalyticallymodelthesleep-modeschemeandvalidatethemodelwithsimulations.IndexTerms—Energyconsumption,IEEE802.16e,sleep-mode.analyticalresultsandvalidatedwithsimulationsinSectionIV.Finally,weconcl
4、udethispaperinSectionV.II.THESLEEPMODEINTHEIEEE802.16EAMSShastwomodes:wake-modeandsleep-mode,showninFig.1.FortheMSS,thetimeisalwaysdividedintocycles,andeachcycleincludesoneperiodinthewake-modeandoneperiodinsleep-modeshowninFig.1.TheMSShastosendasleepr
5、equestframetotheBSandwaitsforBS’sapprovalbeforegoestosleep.Aftergettingapproval,theMSSgoesintothesleep-mode,getssleepforaninterval,andthenwakesuptocheckwhetherthereareframesforit.IfthereareframesfortheMSS,theMSSgoestowake-upmode.Otherwise,theMSSisstil
6、linthesleep-modeandgetssleepforanotherinterval.TheMSSkeepsperformingtheaboveprocedureuntilitgoestothewake-mode.Inthe802.16e[2],sleepintervalsarede?nedasfollows.Atthe?rstsleepinterval,aminimumsleepintervalTmin,isused.Theneachsleepintervalisdoubled(2jTm
7、in),untilamaximumsleepintervalTmaxisreached,andthenthesleepintervalkeepsTmax,wherejstandsforthej-thsleepinterval.Aftereachsleepinterval,theMSStemporarilywakesupashortinterval,calledlisteninterval,tolistenthetraf?cindicationmessagebroadcastedfromtheBS,
8、andthemessageincludesinformationaboutMSSstowhomtheBShasframeswaited.SuchaprocedureshouldbenegotiatedbeforehandbetweentheMSSandtheBS.ParameterssuchasTminandTmaxareincludedthesleeprequestframesentfromtheMSStotheBSbeforesleep.Furthermore,theMSSca
