ECPRI测试原理和测试方法.ppt

eCPRIPrimer,BeReadytoParticipateintheConversation,Rev.AOctober2017,Basestationfunctionsareco-locatedwiththeradiotoweratthebaseoftheantennaorbasementofatallbuilding.Drawbacksofco-location:RFandBasebandProcessingareco-locatedatthebaseofthetower.Needstobephysicallylocatedveryclosetotheantennabecausetheyaredrivenoververylossyelectricalcables.HighpowerdissipationrequirecostlyspecialenclosureswithclimatecontrolandpowerredundancyMakesitdifficulttoinstallandfindalocationthatcanhosttheenclosureand/orincreaseleasepriceduetoadditionalspaceneeded,TraditionalMacro-cell,InformationofVeEXInc.,2,ElectricalCable,CellSiteCabinet,MobileBackhaul,RF,BB,SeparationofRFandBasebandprocessing.Simplifiedfunctionmakesitmorecompact,easiertoinstallandthereforeincreasesthenumberofpossiblesitesFiberLinkreplacesCOALesspowerrequiredatthecellsiteLessprocessingandpowerrequirementsatthecellsiteSmallerfootprint,easiertofindsitesFiberallowsgreatdistancebetweentheRRHandBBUlocation.AllBBUslocatedattheCO.,CPRI/OBSAIFronthaulNetwork,InformationofVeEXInc.,3,Fiber,MobileBackhaul,RF,BB,MobileFronthaul:CPRI/OBSAI,MobileFronthaulTesting,Confidential&ProprietaryInformationofVeEXInc.,4,EvolutionofMobileFronthaul:eCPRI,WhyeCPRI?CPRIrequireshighdatarateThisisnotscalablefor5GtrafficeCPRIisdesignedtomeettheneedsfor5GImprovesbandwidthefficiencyIncreasescapacityeCPRIusespacket-basedtransportnetworkIPorEthernet,eCPRIusespacketbasedtransportnetworkIPorEthernet:usingaswitchedorroutedmobilefronthaulnetworkmakesitmoreflexibleeCPRIusesexistingstandardsforTransportNetworkLayer(Ethernet/IP)Synchronization(SyncE/PTP)C&M(SNMP,EthernetOAM)eCPRIintroducesafunctionalsplitforbasebandprocessingbetweenBBUandRRH.TheFunctionalSplitdefinedintheprotocoladaptstotheapplication.Itisatradeoffbetweenlatencyrequirementsandbandwidthreduction,MobileFronthaulTesting,Confidential&ProprietaryInformationofVeEXInc.,5,HowdoeseCPRIachievethis?,FrontHaulEvolution,InformationofVeEXInc.,6,MobileBackhaul,BBUPool,CPRI/OBSAIFronthaul,RF,RF,RF,BB,BB,BB,BB,MobileBackhaul,BBUPool,RF,BB,BB,BB,BB,BB,RF,BB,RF,BB,eCPRIFronthaul,eRE=eCPRIRadioEquipment(RemoteRadioHead)eREC=eCPRIRadioEquipmentControler(BasebandUnit)3dataflowsbetweenREandREC:Synchronizationtraffic(1588PTP)ControlandManagementTrafficUserPlanetraffic(I/Qsamples),MobileFronthaulTesting,Confidential&ProprietaryInformationofVeEXInc.,7,eCPRIElements,eRE,eREC,BBU,Synchronization,C&MData,UserPlanedata(I/Q),RRH,MobileFronthaulTransportNetwork,eCPRIProtocolStack,MobileFronthaulTesting,Confidential&ProprietaryInformationofVeEXInc.,8,EthernetPHY,OptionalIP/UDP,eCPRIProtocol,I/QUserData,eCPRIPhysicalLayer,MobileFronthaulTesting,Confidential&ProprietaryInformationofVeEXInc.,9,ThefollowingEthernetinterfacesareallowedinthestandard:,HowiseCPRIdataFramed?,MobileFronthaulTesting,Confidential&ProprietaryInformationofVeEXInc.,10,Option1:eCPRIoverEthernet,Option2:eCPRIoverIP/UDP,DestinationMAC,SourceMAC,Type=AEFE,EthernetPayload,CRC,eCPRIHeader,eCPRIPayload=I/Qdataorcontroldata,OptionalVLAN,NeweCPRIEthertype,MACHeader,IPHeader,UDPHeader,EthernetPayload,CRC,eCPRIHeader,eCPRIPayload=I/Qdataorcontroldata,OptionalVLAN,StandarddefineseCPRImessagesforOne-WayDelayMeasurementbetweeneRE/eRECeCPRIOne-WayDelaymeasurementrequiresthatbothendsaretimesynchronizedtothesamesourceeCPRIOne-WayDelayusesDelayrequest/Follow-upandDelayResponsemechanism,MobileFronthaulTesting,Confidential&ProprietaryInformationofVeEXInc.,11,One-WayDelayMeasurement,MobileFronthaulTesting,Confidential&ProprietaryInformationofVeEXInc.,12,eCPRISynchronization,eCPRInodearefrequencyandphasesynchronizedeRE/eRECsynchronizationpathcanbedifferentfromdatapatheRE/eRECsynchronizationfromPTP/SyncEeREsynchronizationrequirementmorestrictthaneREC,becauseeREgeneratesfrequencyforairtransmissionPTPSynchronizationperITU-TTelecomProfile,MobileFronthaulTesting,Confidential&ProprietaryInformationofVeEXInc.,13,eCPRISynchronizationTestingRequirements,Source:RequirementsfortheeCPRITransportNetwork,DefinedintheeCPRITransportNetworkRequirementsshallmeetthefollowingthefollowingcriteria:,MobileFronthaulTesting,Confidential&ProprietaryInformationofVeEXInc.,14,TransportNetworkTestingRequirements,RoEStandard:IEEE1914.3CPRIencapsulatedintoEthernetInProcessofbeingstandardizedwithplanned2017releaseRoEtakesexistingCPRIframesandencapsulatesintoEthernetframesoralternativelytakesfrequencydomainI/QdataandencapsulatesintoEthernetRoEiscompatiblewithexistingCPRIwhereaseCPRIisacompletelynewprotocolnotbackwardcompatiblewithCPRIPossiblyRoEandeCPRIwillcohabitRoEusedforexisting4G-L