动态频谱共享系统中频谱切换机制的研究的中期报告摘要本中期报告介绍了动态频谱共享系统中频谱切换机制的研究进展。首先简要介绍了动态频谱共享系统的概念和结构，然后对其中涉及的若干关键技术进行了讨论，包括频谱感知、频谱控制、频谱切换等。接着重点介绍了频谱切换机制的设计和实现，包括选频策略、切换决策、切换时间等。最后，对当前研究的不足和需要进一步探讨的方向进行了总结。关键词：动态频谱共享；频谱感知；频谱控制；频谱切换；切换机制；IntroductionDynamicspectrumsharingisaneffectivewaytoimprovespectrumutilizationandalleviatespectrumscarcityproblem.Indynamicspectrumsharingsystems,multipleuserscansharethesamespectrumresourcebasedontime,frequencyorspacedivision.Spectrumsensingandcontrolaretwokeytechnologiesfordynamicspectrumsharingsystems.Spectrumsensingistodetecttheunusedoridlespectrumresourcesinagivenfrequencyband,whilespectrumcontrolistoallocateandmanagethespectrumresourcesamongmultipleusersaccordingtotheservicerequirementsandqualityofservice(QoS)constraints.Spectrumswitchingisanothercriticaltechnology,whichistoenabletheuserstoswitchfromonefrequencybandtoanotherwhenthequalityoravailabilityofthecurrentbandisdegradedorunavailable.Inthisreport,wefocusonthedesignandimplementationofspectrumswitchingmechanismindynamicspectrumsharingsystems.Therestofthereportisorganizedasfollows:Section2brieflyintroducestheconceptandarchitectureofdynamicspectrumsharingsystems,anddiscussessomekeytechnologiesinvolved.Section3highlightsthedesignandimplementationofspectrumswitchingmechanism,includingfrequencyselectionstrategy,switchingdecision,andswitchingtime.Section4concludesthereportandpointsoutthefutureresearchdirections.DynamicSpectrumSharingSystemsDynamicspectrumsharingsystemsallowmultipleuserstosharethesamespectrumresourcebasedontime,frequencyorspacedivision.Theuserscanbeclassifiedintotwocategories:primaryusers(PUs)andsecondaryusers(SUs).PUshavetheprimaryrighttousethespectrumresource,whileSUscanaccesstheunusedoridlespectrumresourcesafterobtainingthepermissionfromPUs.Themaincomponentsofdynamicspectrumsharingsystemsincludespectrumsensing,spectrumcontrol,andspectrumswitching,asshowninFigure1.Figure1.ArchitectureofaDynamicSpectrumSharingSystemSpectrumsensingistodetecttheunusedoridlespectrumresourcesinagiv