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ID:36458119
大小:2.92 MB
页数:112页
时间:2019-05-10
《多媒体移动通信网络中的呼叫接纳控制技术研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、东南大学博士学位论文多媒体移动通信网络中的呼叫接纳控制技术研究姓名:吴越申请学位级别:博士专业:通信与信息系统指导教师:毕光国;胡爱群20040618东南火学博上学位论文的优先权,而且还保证实时业务比非实时业务具有更高的优先权;接着对所提出的CAC算法使用马尔可夫分析方法进行了性能评估;然后提出了一种在不同到达速率以及不同混合业务比例时上下行链路带宽分配的自适应带宽比例分配算法;最后研究了不同接纳门限值的选取对系统性能的影响。仿真结果显示,在接纳门限参数取尉=1.05,鲇-1.】,钟=1.15,所=1.2,雕=1.1,雕:1.15时
2、,新呼叫中99%Class0业务,0.5%Classl业务和0.5%Class2业务的比例下,下行链路带宽占总带宽80%时可使系统综合性能取得最佳的权衡,即整个系统的CBP、CDP和中断概率较低,而系统吞吐量最大。关键词:呼叫接纳控Nt](CAC),服务质量(QoS)尔可夫分析,码分多址(CDMA),信干LL(SIR)带宽利用率(BU),吞吐量,中断概率Il多媒体,移动通信网络,带宽预留,马呼叫阻塞率(CBP),呼叫掉线-率-(CDP),——一一一塑茎——AbstractThemobilecommunicationnetworksi
3、nthefutureareexpectedtOsupportmultimediaservices(voice,videotelephone,highspeedinternetaccessandmobilecomputin91overwirelessinfrastructures.Becauseofthelimitationofwirelessspectrum,user’Smobilityandse/f-similarcharacteristicsofthenetworktraffics,ittakeslongertorecoverf
4、romcongestiononceithasoccurred.ItismoreappropriatetOdealwithnetworkcongestionproblemswiththeavoidance/preventionapproach.Withthispointinmind,wehavefocusedoncalladmissioncontrolinmobilemultimediacommunicationnetworksinthispaper.Atfirst,thispaperestablishesbandwidthreser
5、vationbasedCACsystemmodelofmobilemultimediacommunicationnetworks,describesthemultipleclassserviceCACschemewithdifferentpriorityinmobilemultimediaenvironmentindetail,andevaluatestheperformanceusingMarkovanalysiswiththeassumptionthattheoverallsystemishomogeneousinstatist
6、icalequilibriumSecondly,itdiscussesbandwidthreservationbasedCACalgorithmwhichdistinguishesrealtimeandnon-tealtimetraffics,describestheclassificationandcharacteristicsofmultimediatrafficsandpresentsthesimulationmodel,uponwhichameasurementbaseddynamiccalladmissioncontrol
7、schemeisproposed.TheproposedschemeprovidesQoSlevelbylimitingthemaximumthresholdofhandoffcalldroppingprobabilityforrealtimetrafficandperiodicallyadjustingthesizeofreservationpoolaccordingtorapidlychangingnetworkloadconditions.Extensivesimulationresultsrevealthatourschem
8、efeaturesverylowcalldroppingprobability,thenearlysamehighbandwidthutilitywithfixedreservationscheme,withapriceoflittl
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