无线通信系统链路层接入若干关键问题的研究

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1、上海交通大学博士学位论文无线通信系统链路层接入若干关键问题的研究姓名：钱良申请学位级别：博士专业：通信与信息系统指导教师：宋文涛20040601申请上海交通大学博士学位论文务为主的混合业务并在现有典型协议的基础上提出一种码域业务预约机制仿真结果显示在面向语音的业务环境中该协议有比较明显的优势论文最后研究了应用层对链路层协议的影响并以能量受限的应用环境为例重点总结比较了现有典型链路层协议在协议消耗能量性能方面的差异在此基础上提出相应的优化措施与方案关键词无线通信链路层协议多址接入无线资源调度2申请上海交通大学博士学位论文ABSTRAC

2、TThelinklayerprotocolshaveimportantroleinthecommunicationsystem.IntheISOmodel,thelinklayerprotocol,inthemidofphysicallayerandnetworklayer,canprovideintegratedlinkguaranteeforthenetworklayerbyshieldingthecharacteristicsofphysicallayer.Duetothespecialityofwirelessworking

3、environment,correspondinglinklayerprotocolsshouldhandlewithmoredetailedphysicalproblem.Hence,thelayerisusuallyfurtherdividedintomediaaccesscontrollayerandlogiclinklayer,andconstitutesimportantcontentsofwirelesscommunicationsystemairinterface.Thethesisisdividedintotwoma

4、inparts.Chapteronetochapterthreecomprisesthefirstpart,inwhichtheperformanceoflinklayerprotocolsintheidealenvironmentaresummarizedandoptimized.Forthesecondpart,whichiscomprisedfromchapterfourtochaptersix,interactiveeffectsbetweenlinklayerandotherlayersintheISOmodelarean

5、alyzed.Theimportanceofresearchonlinklayerinthefuturewirelesscommunicationisdescribedfirst.AftertheclassificationoflinklayerprotocolsanddetailedstudyonthePRMAprocotolsfamilyisgiven,sometypicalprotocolimprovementmethodologiesonthetimedomainarediscussed.Amodifiedschemebas

6、edonsystemresourcessnatchingmechanismisalsosuggested.WhencomparedtotraditionalPRMAscheme,theproposedonecanutilizedcurrentchannelresourceswithmaximameffortbyassignmentmechanismcontrolledbasestation.Therealtimerequirementsofvoicetrafficpacketsandthethroughputdemandsofdat

7、atrafficpacketscansimultaneouslybesatisfied.Correspondingperformanceoflinklayeraccessprotocolsextendedtomultiplesubdomainsisstudiedthereafter.BydiscussingtheCDMA/PRMAprotocol,multipletimedomainoptimizationschemesaresummaried.Anoptimizedexplicitresourceassignmentaccessc

8、ontrolschemebasedoncodedomainisproposedbysuppressingthemultipleaccessinterferencedeviationinthesystem.Basedonthechara