//standards.ieee.org/guides/bylaws/sb-bylaws.pdf>,includingthestatement"IEEEstandardsmayincludetheknownuseofpatent（s）,includingpatentapplications,providedtheIEEEreceivesassurancefromthepatentholderorapplicantwithrespecttopatentsessentialforcompliancewithbothmandatoryandoptionalportionsofthestandard."EarlydisclosuretotheWorkingGroupofpatentinformationthatmightberelevanttothestandardisessentialtoreducethepossibilityfordelaysinthedevelopmentprocessandincreasethelikelihoodthatthedraftpublicationwillbeapprovedforpublication.PleasenotifytheChairasearlyaspossible,inwrittenorelectronicform,ifpatentedtechnology（ortechnologyunderpatentapplication）mightbeincorporatedintoadraftstandardbeingdevelopedwithintheIEEE802.22WorkingGroup.Ifyouhavequestions,contacttheIEEEPatentCommitteeAdministratorat.
ThistextprovideremedyofComment999,1000,1001,1002,1003,1004,1005,1007,1008,1009,1010,1011,1012,1013,1014,1015,1016,1017,1018,1019and1020
[Toeditor]
-Thistextconsistsoftwoparts,thefirstpartisfinalversionofSection9.2.3whichincludesallresolutionofabovecomments.EditorcancopythefirstpartandpastetoDraftv.2.2.AndthesecondpartincludescollectionhistorytomakeeasyCIDtrace.
-Allfigure,tableandsectionnumbersshouldbechecked（Seebluecolor）.InthistextsuggestednumbersareallocatedbasedonDraftv.2.1.
[ReplacebelowtextwithcorrespondingSection9.2.3]
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9.1
9.2
9.2.1
9.2.2
ChannelClassificationandSelection
TheSMshallassigntheoperatingchanneltotheMAC/PHYmodulesintheWRAN.TheSMshallalsodefinethebackupchannel（s）andtheircorrespondingpriorities.Therestofthechannelsthatarepotentiallyavailableforoperation,butthatarenotselectedastheoperatingchannelorasbackupchannel（s）,maybeclassifiedascandidate,protectedordisallowedchannel（s）.Thechannelsmaybeclassifiedusingthefollowingcategories:
Available:
channelsavailableforconsiderationforpotentialWRANoperationatagivenlocationaccordingtheincumbentdatabases,ifsuchdatabasesexist.ChannelsnotdeemedavailablebythedatabasesareprecludedforusebyWRANs.Ifnoincumbentdatabaseexists,allchannelsareconsideredavailable.Availablechannelsarefurtherclassifiedintooneofthefollowingcategories:
∙Disallowed:
channelsthatareprecludedfromusebytheoperatorduetooperationalorlocalregulatoryconstraints.
∙Operating:
thecurrentchannelusedforcommunicationbetweenBSandCPEswithinaWRANcell.Inordertoprotectincumbents,theoperatingchannelshallbesensedatleastevery2secondsforwirelessmicrophoneandIEEE802.22.1wirelessbeacon.
∙Backup:
channelsthathavebeenclearedtoimmediatelybecometheoperatingchannelincasetheWRANneedstoswitchtoanotherchannel.TheBSmaymaintainmultiplebackupchannelsatanygiventimeandshallorderthemaccordingtotheirrelativepriorities.Backupchannelsshallbesensedforincumbentdetectionatleastonceevery6seconds.AchannelcanstayinthebackupchannellistaslongasnoincumbentisfoundonthischanneltowardswhichharmfulinterferencecouldbeproducedbytheWRANtransmission.
∙Candidate:
channelsthatarecandidatestobecomeabackupchannel.ThesearechannelsthattheBSmayrequesttheCPEstosensetoevaluatethepossibilityofelevatingthemtoabackupchannelstatus.Althoughsensingofcandidatechannelscouldbeinfrequent,beforeacandidatechanneliselevatedtobackupchannel,itmustbesensedasincumbent-freeatleastevery6secondsfornolessthan30seconds.IfthefirstchannelinthelistcanbeconfirmedclearofanyincumbentoperationtowardswhichharmfulinterferencecouldbeproducedbytheWRANtransmissionwithintherequiredtimeperiod,thebasestationcanmoveittothebackuplistifneeded.TheconstitutionofthecandidatechannellistreliesontheextratimethattheCPEswillhavetodosensingbeyondwhatisrequiredtoclearthebackupchannellist.
∙Protected:
channelsinwhichtheincumbentortheWRANoperationhavebeendetectedthroughsensing.ProtectedchannelsmaybemovedtothecandidatechannelsetintheeventthattheincumbentortheWRANsystemshavevacatedthechannel.Sensingisneededtodeterminewhethertheincumbentisstillpresentonthechannel,butsensingcouldbeinfrequentinthesechannels.Aprotectedchannelmayalsobecomeabackupchannel,butbeforeaprotectedchanneliselevatedtobackupchannelstatus,itmustbesensedasincumbent-freeatleastevery6secondsfornolessthan30seconds.TheSMshould,whenpossible,identifythetypeofsignaloccupyingeveryprotectedchannel（see9.2.5）.
∙Unclassified:
channelsthathavenotbeensensed.ThesechannelsmaybesensedaccordingtotheSMimplementation.Onceanunclassifiedchannelhasbeensensed,itmaybere-classifiedasprotectedorcandidatechanneldependingonthesensingresults.
Fortheabovechannelsetdefined:
“Disallowed”,“Operating”,“Backup”,“Candidate”,“Protected”and“Unclassified”channelsets,andallsetsareexclusivetoeachother,i.e.,achannelcannotbelongtomorethanoneofthesesixsets.However,becauseoftheWRANself-coexistencemechanism,anoperatingchannelforoneWRANsystemcanalsobetheoperatingchannelofanotherWRANsystem（‘coexistence’）orbelongtoitsbackuporcandidatelistasexplainedin6.23.3.1.
Thespecificalgorithmsforselectingtheoperatingchannelanddefininghowthebackupandcandidatechannelsareprioritizedisoutsidethescopeofthisstandardaslongastheseimplementationsmeetthesensingrequirements.However,anyimplementationofthesealgorithmsshalluseasinputcurrentchannelavailabilityinformation（asdescribedin9.2.2）.Furthermore,othercriteriamayalsobetakenintoaccountbytheimplementation,suchastrafficrequirements,locationinformation,andcoexistencewithneighboringWRANs.
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10.1.1
10.1.2
10.1.2.1TransitionDiagramforChannelSets
EachchannelontheavailableTVchannellistthatisreturnedfromthedatabaseservice（section9.7.1.8）belongstooneofthepossiblechannelsetsintheBS.Attheendofthequietperiod,dependingontheactivityofincumbentusersandchannelqualityeachchannelmaytransittoothersetsasshownbythestatetransitiondiagramshowninFigure177.Thetransitiondiagramconsistsof5statesand9events.The5statesaredescribedinSection9.2.3.NotethatthesestatesareclassifiedusingspectrumsensingresultsduringWRANinitializationandoperation.Therefore,disallowedandunavailablechannelsareomittedinthisstatetransitiondiagrambecausethosechannelsareclassifiedbyopratororincumbentDB.Possibleeventsforeachstatetransitionaredescribedasfollows:
Event1:
ThechannelintheOperating,Backup,Candidate,orUnclassifiedsetsbecomesamemberoftheProtectedsetifanincumbentappearsintheincumbentdatabaseorisdetectedusingspectrumsensing.
Event2:
IncumbentserviceorotherWRANreleasesthechannel.
Event3:
ThepoorestchannelintheBackupsetbecomesamemberoftheCandidatesetasitsqualityisworsethanthatofanewmemberoftheBackupset.Itcanalsooccurwhenanincumbenthasappearedduringthelast30seconds.
Event4:
ThechannelisreleasedduetotheterminationoftheWRANusageanditsqualityisworsethanthatoftheexistingmembersoftheBackupset.
Event5:
ThechannelbecomesOperatingbyitsnewallocationtotheWRANservice.
Event6:
IfthechannelqualityisbetterthanthatofanexistingmemberoftheBackupset,thenitreplacesthismemberoftheBackupset.Also,allthesechannelssatisfythatnoincumbentappeareddurin
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