ECPRI测试原理和测试方法ppt课件

eCPRIPrimer,BeReadytoParticipateintheConversation,Rev.AOctober2017,.,2,Basestationfunctionsareco-locatedwiththeradiotoweratthebaseoftheantennaorbasementofatallbuilding.Drawbacksofco-location:RFandBasebandProcessingareco-locatedatthebaseofthetower.Needstobephysicallylocatedveryclosetotheantennabecausetheyaredrivenoververylossyelectricalcables.HighpowerdissipationrequirecostlyspecialenclosureswithclimatecontrolandpowerredundancyMakesitdifficulttoinstallandfindalocationthatcanhosttheenclosureand/orincreaseleasepriceduetoadditionalspaceneeded,TraditionalMacro-cell,ElectricalCable,CellSiteCabinet,MobileBackhaul,RF,BB,.,3,SeparationofRFandBasebandprocessing.Simplifiedfunctionmakesitmorecompact,easiertoinstallandthereforeincreasesthenumberofpossiblesitesFiberLinkreplacesCOALesspowerrequiredatthecellsiteLessprocessingandpowerrequirementsatthecellsiteSmallerfootprint,easiertofindsitesFiberallowsgreatdistancebetweentheRRHandBBUlocation.AllBBUslocatedattheCO.,CPRI/OBSAIFronthaulNetwork,Fiber,MobileBackhaul,RF,BB,MobileFronthaul:CPRI/OBSAI,MobileFronthaulTesting,.,4,EvolutionofMobileFronthaul:eCPRI,WhyeCPRI?CPRIrequireshighdatarateThisisnotscalablefor5GtrafficeCPRIisdesignedtomeettheneedsfor5GImprovesbandwidthefficiencyIncreasescapacityeCPRIusespacket-basedtransportnetworkIPorEthernet,MobileFronthaulTesting,.,5,eCPRIusespacketbasedtransportnetworkIPorEthernet:usingaswitchedorroutedmobilefronthaulnetworkmakesitmoreflexibleeCPRIusesexistingstandardsforTransportNetworkLayer(Ethernet/IP)Synchronization(SyncE/PTP)C&M(SNMP,EthernetOAM)eCPRIintroducesafunctionalsplitforbasebandprocessingbetweenBBUandRRH.TheFunctionalSplitdefinedintheprotocoladaptstotheapplication.Itisatradeoffbetweenlatencyrequirementsandbandwidthreduction,HowdoeseCPRIachievethis?,.,6,FrontHaulEvolution,MobileBackhaul,BBUPool,CPRI/OBSAIFronthaul,RF,RF,RF,BB,BB,BB,BB,MobileBackhaul,BBUPool,RF,BB,BB,BB,BB,BB,RF,BB,RF,BB,eCPRIFronthaul,MobileFronthaulTesting,.,7,eRE=eCPRIRadioEquipment(RemoteRadioHead)eREC=eCPRIRadioEquipmentControler(BasebandUnit)3dataflowsbetweenREandREC:Synchronizationtraffic(1588PTP)ControlandManagementTrafficUserPlanetraffic(I/Qsamples),eCPRIElements,eRE,eREC,BBU,Synchronization,C&MData,UserPlanedata(I/Q),RRH,MobileFronthaulTransportNetwork,MobileFronthaulTesting,.,8,eCPRIProtocolStack,EthernetPHY,OptionalIP/UDP,eCPRIProtocol,I/QUserData,MobileFronthaulTesting,.,9,eCPRIPhysicalLayer,ThefollowingEthernetinterfacesareallowedinthestandard:,MobileFronthaulTesting,.,10,HowiseCPRIdataFramed?,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,MobileFronthaulTesting,.,11,StandarddefineseCPRImessagesforOne-WayDelayMeasurementbetweeneRE/eRECeCPRIOne-WayDelaymeasurementrequiresthatbothendsaretimesynchronizedtothesamesourceeCPRIOne-WayDelayusesDelayrequest/Follow-upandDelayResponsemechanism,One-WayDelayMeasurement,MobileFronthaulTesting,.,12,eCPRISynchronization,eCPRInodearefrequencyandphasesynchronizedeRE/eRECsynchronizationpathcanbedifferentfromdatapatheRE/eRECsynchronizationfromPTP/SyncEeREsynchronizationrequirementmorestrictthaneREC,becauseeREgeneratesfrequencyforairtransmissionPTPSynchronizationperITU-TTelecomProfile,MobileFronthaulTesting,.,13,eCPRISynchronizationTestingRequirements,Source:RequirementsfortheeCPRITransportNetwork,MobileFronthaulTesting,.,14,DefinedintheeCPRITransportNetworkRequirementsshallmeetthefollowingthefollowingcriteria:,TransportNetworkTestingRequirements,MobileFronthaulTesting,.,15,RoEStandard:IEEE1914.3CPRIencapsulatedintoEthernetInProcessofbeingstandardizedwithplanned2017releaseRoEtakesexistingCPRIframesandencapsulatesintoEthernetframesoralternativelytakesfrequencydomainI/QdataandencapsulatesintoEthernetRoEiscompatiblewithexistingCPRIwhereaseCPRIisacompletelynewprotocolnotbackwardcompatiblewithCPRIPossiblyR