WIMAX与3G融合网络的呼叫接入控制研究

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1、西南交通大学硕士学位论文WiMAX与3G融合网络的呼叫接入控制研究姓名：杨白帆申请学位级别：硕士专业：计算机应用指导教师：方旭明20070301西南交通大学硕士研究生学位论文第1l页关键词：呼叫允许控制；WiMAX．3G：QoS；融合网络西南交通大学硕士研究生学位论文第1II页AbstractAsanewaccesstechnologyforMetropolitanAreaNetworks(MANs)，WiMAXcallprovidethebroadbandaccessin‘'thelastmile”forwiderarea

2、sthanWi—Fi．TofulfilltherequirementsofQoSandmultimediaapplications，theIEEE802．16standardseriesdefinefourdifferentschedulingservices：UnsolicitedGrantService(UGS)．real-timePollingService(rtPS)，non-real—timePollingService(nrtPS)，andBestEffort(BE)．TheMAClayerofIEEE802．1

3、6standardspecifiesQoSserviceflows，theirparameterconfigurationmechanisms，schedulingservicetypesbasedonQoSandcorrespondingbandwidthrequest／allocation,butthestandardleavessomeimportantissuessuchasaccesscontrolstrategy,QoSparametermappingandpacketschedulingalgorithmsun

4、defined．Thesehotproblemsareexpectedtoberesolvedbytheresearchers．Forimprovingthesystemefficiency,achievinguserfairness，satisfyingtheQoSrequirementsofvariousservices，andcooperatingwith3Gandnextgenerationnetworksasthepartof4Gsystem,weneedtoresearchandimplementtheacces

5、scontrolschemesforWiMAX．Inthisthesis，inordertoguaranteetheQoSrequirementsofvariOUSservicesandimprovethewirelessresourceutilization。thecalladmissioncontrol(CAC)policiesinWiMAXnetworksareproposedbasedonexistingstudys．Ontheollehand，accordingtothecharacteristicsofWiMAX

6、networksandtheQoSrequirementsofthefourdifferentservicetypesintheIEEE802．16familystandards，theadmissioncontrolmechanismsfordifferentservicesareproposed，ontheconditionthatmostsubscribersCanaccessthenetworktogethigh—qualityservicesandmeanwhiletheQoSrequirementsofdiffe

7、rentservicesareallconsidered．Intheschemeofthisthesis，theBSwillgranttherequestofhighprioritytraffic(real-timetraffic)connectionsaccordingtothedifferenceofvariousprioritiesofservicesifitgetsconnectionrequestssimultaneously．Ifthebandwidthisnotenoughforanewhi曲priorityW

8、affleaccessed，thelowprioritytrafficwillbedegradedtoreleasebandwidthforit．Ontheotherhand，toguaranteethefairnessofthesystern,athreshold．．basedschem