ieee 802.16网络qos跨层机制的分析与优化

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1、ASTUDYAND0PTIMIZp灯10N0FCROSS—LAYERFRAMEWORKFORQOSINI琶EE802．16NErWORKSABSTRACTWirelessMetropolitanAreaNetwork(WMAN)becomestobeanimportantpartofglobaltelecommunications。Asiswellknown，Wi撇basedonIEEE802．16，asanavailableaccessmethodforⅥ强压AN，hasdrawnagreatdealofattention

2、foritsbetterperformanceandbrilliantfutureinabroadofareas．Anewcross。layerframeworkforQoSin802．16d／enetworks，whichcouldsuccessfullyachieveQoSguaranteesandimprovetheperformancesofdifferenttypesofservicesinsingleBSPMPapplication，isproposedinthisthesis。Atfirst，wegeneral

3、izetheapplicationbackgroundandcurrentdevelopmentofWiMAXsystemsandIE董泡802．16．Then，technologyofQoSisanalyzedspeciallytoIEEE802．16d／e，includingitsbasicimplementation，technicalhighlightoftheframeworkandpacketschedulingtheoryAfterthat，。wedealwithtechnologyofcross—layer；

4、andalsogenerateanewkindofCROSS．1ayerframeworkforQoSin802．16networks，whereallfunctionmodulesareconsideredaccordingtouplinkanddownlink。Finally,thefourmainfunctionmodulesoftheproposedframeworkarediscussedindetailshere，includinganewmappingrulebetweenIPandMACservicesasa

5、nassistantbuffermanagementforbettersystemperformanceunderlowcomplexity,IPfragmentscontrolforMACframeprocessingwithlesswastage，calladmissioncontrolbasedonthresholdandSINRtoachievehighsystemvalidityandstability,andalsoahierarachicalpacketschedulingalgorithmforbothenh

6、ancedQoSguaranteesandfairness。Atthesametime，werealizethesimulationinstanceswithNStodisplaytheadvantagesoftheproposedscheme。IlKEYWORDS：802．16，WiMAX，QoS，CROSS—layer,mapping，scheduling掇北京邮电大学硕上学位论文IEEE802．16网络QoS跨层机制的分析与优化缩略语皤AssuredForwarding确保转发AMCAdaptiveModulation

7、andCoding自适应调制编码ARQAutomaticRepeatrequest自动重发请求A：rMAsynchronousTransferMode异步传输模式BEBestEffort尽力而为服务BSBaseStation基站BWABroadbandWirelessAccess宽带无限接入BW．REQBandwidthRequest带宽请求BW．RSPBandwidthResponse带宽请求应答CEDFCompensationEarliestDeadlineFirst补偿最早截止时间优先CIDConnectionID连接

8、标识CLControlledLoad可控负载CSIChannelStateInformation信道状态信息DAMADemandAssignedMultipleAccess按需分配多址访问Dif珞ervDifferentiatedService区分服务DRRDeftcitRoundRobi