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首页 CTIA MIMO OTA 技术提案计划

CTIA MIMO OTA 技术提案计划.doc

CTIA MIMO OTA 技术提案计划

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2017-09-28 0人阅读 举报 0 0 暂无简介

简介:本文档为《CTIA MIMO OTA 技术提案计划doc》,可适用于IT/计算机领域

CTIAMIMOOTA技术提案计划CTIACertificationProgramWorkingGroupContributionContributionNumberMOSGFIRSTDRAFTRevAContributor'sNameScottPrather,ATTContributionDateJune,ContributionTopicCTIAMIMOOTASubGroup(MOSG)InitialReporttotheCTIAERPWorkgroupCOPYRIGHTSTATEMENT:Thecontributorgrantsafree,irrevocablelicensetoCTIA–TheWirelessAssociation(CTIA)toincorporatetextorothercopyrightablematerialcontainedinthiscontributionandanymodificationsthereofinthecreationofaCTIAPublicationtocopyrightinCTIA'snameanyCTIAPublicationeventhoughitmayincludeallorportionsofthiscontributionandatCTIA'ssolediscretiontopermitotherstoreproduceinwholeorinpartsuchcontributionsincorporatedintheresultingCTIAPublicationThisdocumenthasbeenpreparedbythecontributortoassisttheCTIACertificationProgramWorkingGroupItisprovidedtotheWorkingGroupasabasisfordiscussionandisnottobeconstruedasabindingproposalonthecontributorThecontributorspecificallyreservestherighttoamendormodifythematerialcontainedhereinandnothinghereinshallbeconstruedasconferringorofferinglicensesorrightswithrespecttoanyintellectualpropertyofthecontributorotherthanprovidedinthecopyrightstatementaboveTotheextentthatacontributioncontainsworksoftheUSgovernment,suchworksarenotaffordedcopyrightprotectionundertheUSCopyrightAct(SeeUSC)IntroductionSinceMarch,,theCTIAMIMOOTASubGroup(MOSG)hasbeeninvestigatingthenumeroustestaspectsassociatedwithMIMOOTAperformanceevaluationTheinitialscopeofthisprojectincludedteststhatcouldbeusedtodeterminewhatconstitutesa“good”vsa“bad”performingMIMOcapableUE,andanevaluationofaMIMOUE’sspatialperformancecharacteristicsAstheprojectprogressed,itbecameclearthatjustdeterminingwhatconstitutesa“good”vsa“bad”performingMIMOUEisquitechallenging,andthereforethescopeofworkwasdividedintotwopartsThisinitialreporttotheCTIAERPWorkgroupfocusesonthefirstpartofourwork,whichistodevelopatestmethodologywhichcandifferentiatea“good”froma“bad”performingMIMOUEWithinthistestmethodology,itisenvisionedthatmorethanoneMIMOOTAmeasurementtechniquemaybeincludedintheMOSGtestmethodologydeliverableTowardsthisend,numerouscontributionshavebeenconsideredbythegroupcoveringawidevarietyofpotentialMIMOOTAmeasurementtechniquesProponentsofeachproposedmeasurementtechniquehavepresentedcontributionsdescribingthedetailsoftheirapproachalongwithrepresentativepreliminarytestresultsInaddition,theMOSGhasdevelopedtoolstoobjectivelyquantifyeachproposedmethod’sabilitytodistinguishbetweena“good”anda“bad”performingMIMOUEThisstatusreportprovidestheCTIAERPWorkgroupwithanoverviewoftheworkthat’stakenplaceandtheproposedwayforwardBackgroundThechallengesassociatedwithMIMOOTAperformanceevaluationdiffersubstantiallyfromthechallengesthattheERPWorkgroupfacedaboutyearsagowhenCTIAsetouttodefineameasurementmethodologyforSISOradiatedperformancemeasurementsThereceiveperformanceofaSISOdeviceistypicallyevaluatedusingaperformancemetricwhichcapturesisotropicandspatialantennaefficiency,aswellastheeffectsofUEselfinterferenceBecauseaSISOreceiverdoesnotrequireaspecialpropagationenvironmentinordertodisplaymaximumperformanceanLOSradiopathwithinananechoicchamberisemployedMIMO,ontheotherhand,requiresaspatiallydiverseradiochannelinordertodelivermaximumperformanceMIMOsystemstransmittwoseparatedatastreamstotheUE,andtheUEisunabletotakefulladvantageofthesetwostreamsunlesstheyarepresentedtotheUEreceiverastwosignalswithverylowcorrelationConsequently,apureLOSenvironmentwithnoabilitytogenerateaspatiallydiversesignalcannotbeusedtodirectlyassessMIMOperformanceHowever,itispossibletoindirectlyassesstheUEsMIMOperformanceinanLOSenvironment,aswillbeseeninthesectionsthatfollowOverviewofProposedMIMOOTAMeasurementTechniquesTheprimarygoalofanyMIMOOTAradiatedperformancetestsystemistomeasureandcompareMIMOcapabledevicesandalgorithmsbasedonthroughputIt’simportantthatallaspectsofthemobileterminaldesign(antennas,RFfrontend,basebandprocessing)betestedNotalltechniquesarecapableofevaluatingtheUE’sMIMOperformanceinthepresenceofimpairmentsassociatedwithselfinterference,butinsteademulatetheUEgeneratednoiseenvironmentInaddition,notalltechniquesdirectlymeasuretheradiatedMIMOperformanceoftheUE,butcanderiveitthoroughothermeasurementsFourgeneralMIMOOTAmeasurementtechniqueshavebeenproposedintheMOSG:TwoofthesetechniquesdirectlymeasureUEMIMOOTAperformancewhiletheremainingtwomeasureMIMOperformanceindirectlyDirectMeasurementTechniques:,AnechoicChamberMultiProbeMethods,ReverberationChamberMethodsIndirectTechniquesoDecompositionMethodoTwoStageMethodThesetechniqueswillbedescribedindetailinthesectionsthatfollowDirectTechniquesAnechoicChamberMultiProbeMethodsTheanechoicMIMOperformancemeasurementtechniquesaremoreaccuratelydescribedas“boundaryarray”methods,wherebyanarrayofantennasisusedtorecreateallorpartofanRFboundaryconditionaroundtheDUTtoemulateaspecificspatialchannelmodelwithinthetestvolumeThequalityoftheemulationispredominantlyafactorofthearrayresolutionattheboundaryWidebandcellularchannelsexhibitaclusterbehaviorwhichcanbetakenintoaccountbyemulatingaspatialchannelmodelwithintheanechoicchamberClustersaresimultaneouslymappedtotheprobessothatthesumofthetransmittedsignalsattheDUTlocationmatchesthedefinedspatialchannelmodelTherearetwocommonimplementationsofthissystem,consistingofeitheraboundaryring(“MultiProbe”)oraboundaryarc(“SingleCluster”)TheseconfigurationsmatchthecurrentlydefinedspatialchannelmodelswhichdonotcontainanelevationdistributionThecompleteboundaryringcanemulatebothsingleandmulticlustermodels,whiletheboundaryarcissuitableforsingleclustermodelsandrequireslesschannelemulationresourcesforthesameangularresolutionFullsphericalimplementationsarealsopossibleAturntableisnormallyusedtoprovideazimuthalaveragingofthedeviceperformanceasafunctionofitsorientationwithinthetestvolume,althoughrotationofthechannelmodelaroundtheDUTcanalsobeusedTwoaxisrotationisalsopossibletoallowforDevaluationofthedeviceperformance,althoughtheresultsfromsuchatestmaydeviatefromarealisticusagescenarioReverberationChamberMethodsThereverberationchambertechniquesutilizeametalliccavityorsetofcoupledcavitiessufficientlylargetosupportmanyresonantmodesThechamber’smodesare“stirred”usingacombinationofmetallicpaddles,turntables,sourceantennasandfrequencystirringtechniquesThisresultsinthecreationofarichmultipathuniformandisotropicfadingenvironmentTherealandimaginarypartsofthereceivedsignalareGaussiandistributed,withtheirassociatedmagnitudefollowingaRayleighdistributionandthephasefollowingauniformdistributionover,ReverberationchamberscanbeusedforMIMOperformanceevaluationutilizingeithertheirinherentchannelpropagationcharacteristics,orthechambercanbecombinedwithachannelemulatortomodifythetemporalpropagationcharacteristicsWhenusedwithoutachannelemulator,areverberationchamberwillcreateapropagationchannelcharacterizedbyitsowninherentpowerdelayspreadThepowerdelayprofiledependsonanumberofchambercharacteristics,egsizeofthechamberandtheamountofRFabsorbingmaterialThedelaycanbetunedtosomeextentbyloadingthechamberwithRFabsorbersAlternatively,areverberationchambercanbecombinedwithachannelsimulatortoemulatecomplexspatialtemporalpropagationenvironmentswithinthetestvolumeThecombinedsystemisusedtoproducethesamechannelconditionsasindustrystandardconductedtests,wherecomplextemporalandspatialenvironmentscanbecreatedandAWGNSNRcanbecontrolledIndirectTechniquesDecompositionMethodTheLTEMIMOdecompositionapproachdeterminesseparateFOMsforthekeyMIMOreceiverchainsubsystemsTheconductedMIMOtestutilizesafadingsimulatortointroducedynamicfadingandisusedtodetermineaFOMfortheMIMOreceiverperformanceTheradiatedtestisperformedwithouttheintroductionoffadingprofilesinsidetheanechoicchamberandisusedtodetermineaFOMfortheMIMOreceiveantennapairwiththedevicetestedintheOLSMtransmissionschemeTheFOMfortheoverallMIMOperformanceoftheDUTisacombinationoftheFOMsfromeachtest(conductedandradiated)SplittinguptheMIMOwirelesssystemperformancetestingintotwostraightforwardtestsprovidesmoreinformationabouttheDUTperformancethanperformingasinglecomplextestTheradiatedteststakerealisticAoAsfortheMIMOstreamsintoaccountandprovidesufficientcontrolovertheAoAsinDbydefiningtheoriginsandthepolarizationsoftheMIMOstreamsInadditiontoprovidinganantennaspecificFOM,theradiatedtestcanbeusedtoprovideaFOMfordeviceperformancewiththeDUTexposedtobasicMIMOconditionsasdevicelevelperformancemetricsarecapturedbydefaultTwoStageMethodThetwostagemethodseparatesMIMOOTAperformancetestingintotwostagesThefirststageistomeasuretheDUT’santennapatternaswellasitsnoiseinterferencefloorinsideastandardSISOanechoicchamberusinganonintrusivemeasurementmethodsupportedbytheUEchipsetThesecondstagetakestheformofatraditionalconductedconformancetestwhichconvolvesthemeasuredantennapatternwiththedesiredchannelmodeltorecreatethesameconditionsattheinputtotheDUTreceiverasthattheUEwouldhaveexperiencedthroughitsownantennashaditbeenimmersedintheactualchannelmodelThetwostagemethodutilizesexistingCTIAcertifiedSISOanechoicchambersfortheDUT’spatternmeasurementstageOncethisantennadatahasbeencollected,thistechniqueallowsthelabtoassessUEperformanceinanyarbitraryDorDchannelmodelAnimportantattributeassociatedwiththetwostagemethodisthattheUEmustsupportanantennapatternmeasurementfunction,similartothatofaVNAItisanticipatedthatthiswillbeanoptionalfeaturewhich,ifenabledbytheUEmanufacturer,willenabletheUEtocollectthedatapointsrequiredforthistechniqueAlso,thetwostagemethoddoesnottaketheDUT’sselfinterferenceintoaccountwhenmeasuringdeviceperformanceWorkisongoingtodevelopameansbywhichselfinterferencecanbeassessedandemulatedinthechannelmodelMOSGMIMOReferenceAntennasandReferenceDevicesGiventhediversenatureofthefourtechniquessummarizedintheprevioussection,it’sclearthattheMOSGmustevaluatetheefficacyofthesefourmethodsinastandardizedmannerThiswillallowthedirectcomparisonofresultsbetweentechniquessuchthatanydifferencescanbeidentifiedatanearlystageandaddressedThecomparisonofmeasurementtechniquesisnothingnewOvertheyears,theindustryhasestablished“roundrobin”testeffortsdesignedtoidentifythestrengthsandweaknessesofproposedmeasurementmethodologies,whileatthesametimeattemptingtoquantifydeviceperformanceinsuchawaythatresultscanbedirectlycomparedbetweenlabsandmeasurementtechniquesUnfortunately,almostallsucheffortshaveemployedtheuseofcommerciallyavailabledeviceswhoseantennacharacteristicswereunknownInaddition,earlyMIMOdevicescametomarketasUSB“dongles”whichrequireanotebookcomputerinordertofunctionTheinclusionofanotebookcomputerrepresentsasignificantmeasurementuncertaintyaspect,sincethenoisecharacteristicsofthenotebookaretypicallyunknownandcanvaryaccordingtodeviceplacementandorientationConsequently,theMOSGfeltthatinordertobesuccessful,wemusthavefeweruncertaintytermsthanthosetypicallyassociatedwithcommerciallyavailabledevicesandvaryinghostplatformsInanefforttoaddressthisneed,MotorolatookonthetaskofdevelopingasetofstandardizedMIMOtestantennasTheseantennaspossessseveraluniqueattributesessentialtotheevaluationofthevariousMIMOOTAmethodsTheMIMOreferenceantennasarecurrentlycommerciallyavailablefromSatimoaskitssupporting,inascendingfrequency,GPPBand,Band,andBandTheseantennasareuniqueinthatthey:)RepresentKnownCorrelationCoefficients:InBand,threeantennasareavailableasakitwhichrepresenta“good”,“nominal”,and“bad”correlationcoefficient(complexcorrelationcoefficientof<,<and<,respectively)Bandsandincludeonlytwoantennas(CC<andCC<)becausedesigningantennaswithhighcorrelationisdifficultatthesefrequencies)DisplayLowBranchGainImbalance:Theseantennasdisplayabranchgainimbalancethat’swithinlessthandB)DisplayIdealComplexImpedance:ThereferenceantennaspresentanearlyidealjimpedancetotheDUT,allowingtheinsertionofattenuatorstomimiccontrolledbranchgainimbalancewithoutsignificantlyaffectingtheantennasourceimpedanceseenbythereceiverortheterminatingimpedanceseenbytheantenna)ProvideNoiseIsolation:AllofthereferenceantennasincludeashieldedboxwithinwhichtheDUTcanbeplaced,isolatingitfromanyselfinterferenceeffects(otherthanthosethatwouldotherwisebepresentinaconductedenvironment)Inaddition,theantennasarepresentedtotheDUTthroughrightangleSMAconnectors,eliminatingtheneedfortransmissionlinesandcommonmodechokes)IncludeStandardizedComplexPatternData:ComplexpatterndatafortheantennashasbeenobtainedandpublishedbySatimo,soanytechniquewhichreliesonthisdatacancomparemeasurementresultsagainstthepublisheddataInaddition,theknowncomplexpatterndatacanbeusedtocalibratethetestvolumeagainstapredeterminedspatialchannelmodelTheMOSGreferenceantennasareakeydifferentiatingaspectoftheworkproposedforthisgroupvisa’vissimilarroundrobintesteffortspreviouslyexecutedintheindustryThereferenceantennasdonotsolveallmeasurementuncertaintyproblems,howeverInfact,whiletheirusewillreducemeasurementuncertaintyfromthestandpointofcomparingresultsbetweentechniquesandorlabs,theyintroducesomemeasurementuncertaintyaspectsthatmustbeconsideredwheneachoftheproposedtechniquesisusedtomeasuretheperformanceofactualMIMOcapabledevicesForexample:a)BecausethereferenceantennasincludeashieldedboxtoisolatetheDUTfromtheantenna,theabilityofanytechniquetoassesstheimpactofUEselfinterferenceislostConsequently,thereisnowaytogaugehowaccuratelyanyoftheproposedtechniqueswillbeabletoassesstheperformanceofactualMIMOcapabledevicesinthepresenceofUEselfinterferenceb)BecausethereferenceantennaspresentanearlyidealsourceimpedancetotheDUTreceiver,anyMIMOperformancevariationduereceiversourcepulleffectswillnotbeobservedInspiteoftheseminordrawbacks,theMOSGreferenceantennasareseenasavitalaspectofourMIMOOTAperformancemeasurementassessmentInterLabInterTechniqueTestingTheMOSGhasdevelopedapreliminarytestmethodologywhichwillleveragetheMOSGreferenceantennasdevicessuchthateachoftheproposedtechniquescanbereadilycomparedThetestmethodologywillalsoallowmultiplelabsutilizingthesametechniquetocompareresultsThehypothesisunderlyingthisinterlabintertechnique(ILIT)testeffortisthattheproposedtechniquesaresufficientlymaturetoreturnresultswhichwillcorrelatewellforagivenreferenceantennadevicecombinationregardlessofthetechniqueorlabemployedInaddition,theMOSGalsobelievesthatactualtestresultsfromeachoftheproposedtechniquesshouldcorrelatewellwithsimulationsIftheresultsforthistesteffortshowthatthishypothesisgenerallyholdstrue,thentheactualuncertaintyassociatedwitheachtechniqueortheuncertaintywithinatechniquecanbemorecloselyinvestigatedandanynecessarychangescanbemadetothetestmethodologyChangestoanyofthetechniqueswillcallfortheMOSGtoexecuteasecondroundofILITtestingOncecorrelationbetweentestresultsforthevarioustechniques,labsandsimulationsisfoundtobesufficient(thegrouphasnotyetdefinedthisaspectofourwork),theMOSGwilldevelopadraftMIMOOTAtestmethodologybasedonthelessonslearnedthroughtheILITcomparisontesteffortWhiletheoriginalintentoftheCTIAMIMOreferenceantennaswastoprovideacommerciallyavailableproductthatcouldbeutilizedanylabwithminimalmeasurementuncertainty,theMOSGfeltthattheinterlabintertechniquecomparisontesteffortshouldincludeapredefinedsetofreferenceantennasandreferencedevicestofurtherreduceuncertaintyTowardsthisend,theMOSGhasprocuredasetoffivereferenceantennasforBandandasetoffivereferenceantennasforBandThesereferenceantennashavebeenassigneduniqueidentifyingnumberswhichcanbeusedtodirectlycomparetestresultsbetweenantennaswhennecessaryThereferenceantennashavealsobeenpairedwithasetofmatchingreferencedevicesLikethecorrespondingmeasurementantennas,thereferencedeviceshavebeenassigneduniqueidentificationnumbers,andthereferenceantennasdeviceswillbecirculatedamongparticipatingtestlabsasamatchedsetAtthistime,theMOSGplanstohavefourofthefiveantennadevicekitsoutinthefieldatatimeThiswillallowCTIAtopromptlyreplaceanydevicesorantennasthatfailwithouttheneedtowaitforotherlabstoreturntheirkitsIt’simportanttonotethattheCTIAMOSGisnotworkingonthisprojectinisolationSincetheMOSGwasfoundedinMarch,,thegrouphasworkedcloselywithGPPRANtoensurethatthetestmethodsproposedforusewithinCTIAareinalignmentwiththeGPPspecificationsInaddition,theMOSGhasrequestedthatSubjectMatterExperts(SMEs)withintheRANMIMOOTAprojectprovideinputtotheMOSG,furtherdistributingtheworkloadandhelpingtoensurethattheresultingtestplaniswellharmonizedwiththefutureRANMIMOOTAtestspecificationILITComparisonTestScheduleTBD(Thissectionwillbeaddedtothefinaldraft)MIMOOTAMethodologyDevelopmentScheduleCurrently,theMOSGisplanningtodeliveradraftMIMOOTAtestmethodologytoCTIAERPbyOctober,Thisdraftmethodologywillonlyaddressthetestingnecessarytodifferentiatebetweena“good”and“bad”performingMIMOcapableUEAdvancedtesting,whichincludesdetailedUEMIMOOTAperformancedatafromaspatialperspective,isconsidered“Advanced”MIMOOTAtesting,andanassociatedtestmethodologycouldbemadeavailabletoCTIAERPbymidThe“advanced”testaspectoftheprojecthasnotbeenfullyconsideredbytheMOSGandcommitmentstothisaspectofourworkshouldbeconsideredpreliminaryatthistime

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