22100184010000proposedchangestosmandssafiguresbasedonreceivedcomments文档格式.docx
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ApurvaMody
BAESystems
404-819-0314
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9
Notice:
ThisdocumenthasbeenpreparedtoassistIEEE802.22.Itisofferedasabasisfordiscussionandisnotbindingonthecontributingindividual(s)ororganization(s).Thematerialinthisdocumentissubjecttochangeinformandcontentafterfurtherstudy.Thecontributor(s)reserve(s)therighttoadd,amendorwithdrawmaterialcontainedherein.
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Abstract
ThefollowingdocumentproposesresolutionstocommentsrelatedtotheSection9.
CognitiveRadioCapability
9.1General
Thisclausedescribesthecognitiveradiocapabilitiessupportedbythe802.22standard,whicharerequiredtomeetregulatoryrequirementsforprotectionofincumbentsaswellastoprovideforefficientoperationof802.22networks.Thecognitiveradiocapabilitiesinclude:
BSSpectrumManager(SM),SpectrumSensingAutomaton(SSA),Accesstothedatabaseservices,Channelsetmanagement,Policy(Table233andAnnexA),CPERegistrationandTracking,SpectrumSensingServicesandGeolocationServices.
802.22devicesshallemploycognitiveradiocapability,whichshallenablethemtomakedecisionsabouttheirradiooperatingbehaviorbasedoninformationfromvarioussourcessuchassensing,geolocationandthedatabaseservice,policy,etc.Theinformationshouldbeobtainedthroughcommunicationwiththedatabaseservice,orthroughdirectsensingforincumbentsonTVchannelsthatwouldbeimpactedbyoperationofthe802.22device,orboth.Theinformationmayalsobetheresultofrulesgoverningtheparticularregulatorydomainwherethedeviceintendstooperate(e.g.certainTVchannelsmaybe“offlimits”becausetheywereallocatedforsomeotherspecificuse).Thisclausedefinesthe802.22functionalentities,informationelements,andproceduresrelatedtoobtainingandmanagingthisinformation.
Ifadatabaseserviceispresentinthedomainwherethe802.22devicewouldoperate,the802.22deviceshallretrieveappropriatespectrumavailabilityinformationbasedonthegeographiccoordinatesofitsintendedoperatinglocationfromthedatabaseservice,asdescribedbyproceduresdefinedinthisclause.
An802.22deviceshallalsosenseforthepresenceofincumbentsinareaswherethe802.22deviceintendstooperate,bothpriorto,andduringoperation.ThisincludessensingtheprospectiveTVchannelsofoperationaswellasanyotherTVchannelsthatmightbesubjectedtoharmfulinterferenceasaresultoftheoperationofthe802.22device.Signalsthatthe802.22deviceshallsenseforare:
·
TelevisionBroadcasts
WirelessMicrophonetransmissions
Transmissionsfromprotectingdevices,suchasthe802.22.1WirelessBeacon
Otherincumbentdevicessuchasmedicaltelemetrydeviceswhichmayneedtobeprotectedinthelocalregulatorydomain.(seefootnote20page8oftheFCCR&
O08-260)
The802.22systemsshallselecttheiroperating,backup,candidatechannelsetsbasedontheproceduresthataredescribedinSection9.2.3.The802.22transmissionshallbecontrolledbyvariouspolicieswhicharedefinedin9.2.5relatedtotheSpectrumManagerPolicies.TheSpectumManageroperationisdescribedindetailin9.2.
Notethat802.22devicesmustalsosenseforother802.22systemsthatmaybepresentandoperatingintheirarea.Ifsuchsystemsarediscovered,thedevicesshallfollowthecoexistenceproceduresdefinedinthe802.22MACsubclause6.23.
Theorganizationofthisclauseisasfollows:
subclause9.2describestheSpectrumManagerOperation;
subclause9.3describestheSpectrumSensingAutomaton;
subclause9.4describestheSpectrumSensingFunction;
subclause9.5describestheGeolocation;
subclause9.6describesthedatabaseserviceandfinallysubclause9.7describesPrimitivesandMessagingassociatedwiththecognitivefunctions
9.2SpectrumManagerOperation
9.2.1General
TheSpectrumManager,asshowninthe802.22referencemodel(Figure7),shallbepartofthecognitiveplaneandshallalwaysbepresentatthe802.22BS.TheSMisresponsibleforthemostimportanttasks,suchasmaintainingspectrumavailabilityinformation,channelselection,channelmanagement,schedulingspectrumsensingoperation,accesstothedatabase,enforcing802.22andregulatorydomainpolicies,andenablingself-coexistenceetc.ThedetailedoperationoftheSMisdescribedinSection9.2.
Figure1IEEE802.22SpectrumManagerandLogicalInterfaces
Allthe802.22devices(BSandCPEs)shallalsohaveanentitycalledtheSpectrumSensingAutomaton(SSA).TheSSAinterfacestotheSpectrumSensingFunction(SSF)andexecutesthecommandsfromtheSMtoenablespectrumsensing.ThedetailedoperationoftheSSAisdescribedinSection9.3.ThefollowingclausesdescribetheSMfunctionalities.
TheSMisacentralpartoftheWRANBS,whichshallberesponsibleforensuringprotectionofincumbentsandefficientspectrumutilizationwhilecomplyingwithregulatorypolicies.Forthat,theSMcentralizesallthedecisionswithintheWRANcellwithrespecttospectrumavailabilityandutilization.Insummary,thekeyfunctionsoftheSMarethefollowing:
∙MaintainspectrumavailabilityInformation;
∙Channelclassificationandselection;
∙Associationcontrol;
∙Channelsetmanagement;
∙Accessingthedatabaseservice;
∙Schedulingquietperiodsforspectrumsensing;
∙Enforcing802.22andregulatorydomainpolicies
∙MakingchannelmovedecisionsforoneormoreCPEsortheentirecell
∙Self-coexistencewithotherWRANs,etc.
Thesefunctionsaredescribedinthefollowingclauses.ItisimportanttonotethatthisstandarddoesnotspecifyanyparticularSMimplementation,butinstead,itdescribesthemandatorybehaviorforanySMimplementationinordertoprovideforproperprotectionofincumbents,compliancewithregulatorydomainpolicies,andinteroperabilityamongstdifferentWRANimplementations.
TheSMshalldeterminetherequirementsfortherateofSCWstoensuresufficientcoexistenceinformationexchangecapacityandshallworkwiththedataschedulertoinfluencetheamountofdatagoingtoaCPEsothatithassufficienttimetoclearenoughbackupchannelsduringitsidletime.
9.2.2MaintainSpectrumAvailabilityInformation
TheSMshallmaintainthestatusofthespectrum(i.e.TVchannels)availableforWRANoperationatitslocationwithinaregulatorydomainaccordingtothepoliciesandrulesestablishedforthatdomain(e.g.regulatoryrulesestablishedbytheFCCintheUSforuseofTVchannels).TheSMshallobtaininformationonthechannelstatuswithrespecttothepresenceofincumbentsandotherWRANsinthearea,anditshallusethisinformationasinputforitsdecisionswithrespecttochannelselection,channelstatemanagementandself-coexistencemechanisms.
Tomaintainthestatusofthechannelsavailableforoperation,theSMshallbeabletoaggregateinformationfromatleastthefollowingsources:
1.Databaseservice:
TheSMshallaccessanincumbentdatabasethroughthehigherlayers.TheSMshallberesponsibleforaccessingtheofficialdatabaseserviceintheregulatorydomainsthatmandatethepresenceofsuchadatabase.Intheregulatorydomainsthatdonotmandatesuchofficialdatabaseservice,adatabaseofavailablechannelsshallbeprovidedbytheoperator.
2.Geolocation:
TheSMshallbeabletoaccessgeolocationinformationavailableattheBStoidentifyitsownlocation,anditshallalsobeabletoobtainlocationinformationfromallCPEsassociatedwiththeBSorthatarerequestingassociationwiththeBS.
3.Spectrumsensing:
TheSMshallinterfacewiththeSpectrumSensingAutomatonslocatedwithintheBSandtheCPEs.TheSMshallusetheMACandPHYlayerfunctionalitiesandmanagementframestocontrolandcoordinatespectrumsensingwithintheWRANcell.TheSMshalltriggertherequestsfortheSSAslocatedwithintheBSand
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