ECPRI测试原理和测试方法课件

eCPRIPrimerBeReadytoParticipateintheConversationRev.A October2017ECPRI测试原理和测试方法Basestationfunctionsareco-locatedwiththeradiotoweratthebaseoftheantennaorbasementofatallbuilding.Drawbacksofco-location:RFandBasebandProcessingareco-locatedatthebaseofthetower.Needstobephysicallylocatedveryclosetotheantennabecausetheyaredrivenoververylossyelectricalcables.HighpowerdissipationrequirecostlyspecialenclosureswithclimatecontrolandpowerredundancyMakesitdifficulttoinstallandfindalocationthatcanhosttheenclosureand/orincreaseleasepriceduetoadditionalspaceneededTraditionalMacro-cellElectricalCableCellSiteCabinetMobileBackhaulRFBB2ECPRI测试原理和测试方法SeparationofRFandBasebandprocessing.Simplifiedfunctionmakesitmorecompact,easiertoinstallandthereforeincreasesthenumberofpossiblesitesFiberLinkreplacesCOALesspowerrequiredatthecellsiteLessprocessingandpowerrequirementsatthecellsiteSmallerfootprint,easiertofindsitesFiberallowsgreatdistancebetweentheRRHandBBUlocation.AllBBUslocatedattheCO.

CPRI/OBSAI–FronthaulNetworkFiberMobileBackhaulRFBBMobileFronthaul:CPRI/OBSAI3ECPRI测试原理和测试方法EvolutionofMobileFronthaul:eCPRIWhyeCPRI?CPRIrequireshighdatarateThisisnotscalablefor5GtrafficeCPRIisdesignedtomeettheneedsfor5GImprovesbandwidthefficiencyIncreasescapacityeCPRIusespacket-basedtransportnetworkIPorEthernetMobileFronthaulTesting4ECPRI测试原理和测试方法eCPRIusespacketbasedtransportnetworkIPorEthernet:usingaswitchedorroutedmobilefronthaulnetworkmakesitmoreflexibleeCPRIusesexistingstandardsforTransportNetworkLayer(Ethernet/IP)Synchronization(SyncE/PTP)C&M(SNMP,EthernetOAM)eCPRIintroducesafunctionalsplitforbasebandprocessingbetweenBBUandRRH.TheFunctionalSplitdefinedintheprotocoladaptstotheapplication.ItisatradeoffbetweenlatencyrequirementsandbandwidthreductionHowdoeseCPRIachievethis?MobileFronthaulTesting5ECPRI测试原理和测试方法FrontHaulEvolutionMobileBackhaulBBUPoolCPRI/OBSAIFronthaulRFRFRFBBBBBBBBMobileBackhaulBBUPoolRFBBBBBBBBBBRFBBRFBBeCPRIFronthaul6ECPRI测试原理和测试方法eRE=eCPRIRadioEquipment(RemoteRadioHead)eREC=eCPRIRadioEquipmentControler(BasebandUnit)3dataflowsbetweenREandREC:Synchronizationtraffic(1588PTP)ControlandManagementTrafficUserPlanetraffic(I/Qsamples)eCPRIElementseREeRECBBUSynchronizationC&MDataUserPlanedata(I/Q)RRHMobileFronthaulTransportNetworkMobileFronthaulTesting7ECPRI测试原理和测试方法eCPRIProtocolStackEthernetPHYOptionalIP/UDPeCPRIProtocolI/QUserDataMobileFronthaulTesting8ECPRI测试原理和测试方法eCPRIPhysicalLayerThefollowingEthernetinterfacesareallowedinthestandard:MobileFronthaulTesting9ECPRI测试原理和测试方法HowiseCPRIdataFramed?Option1:eCPRIoverEthernetOption2:eCPRIoverIP/UDPDestinationMACSourceMACType=AEFEEthernetPayloadCRCeCPRIHeadereCPRIPayload=I/QdataorcontroldataOptionalVLANNeweCPRIEthertypeMACHeaderIPHeaderUDPHeaderEthernetPayloadCRCeCPRIHeadereCPRIPayload=I/QdataorcontroldataOptionalVLANMobileFronthaulTesting10ECPRI测试原理和测试方法StandarddefineseCPRImessagesforOne-WayDelayMeasurementbetweeneRE/eRECeCPRIOne-WayDelaymeasurementrequiresthatbothendsaretimesynchronizedtothesamesourceeCPRIOne-WayDelayusesDelayrequest/Follow-upandDelayResponsemechanismOne-WayDelayMeasurementMobileFronthaulTesting11ECPRI测试原理和测试方法eCPRISynchronizationeCPRInodearefrequencyandphasesynchronizedeRE/eRECsynchronizationpathcanbedifferentfromdatapatheRE/eRECsynchronizationfromPTP/SyncEeREsynchronizationrequirementmorestrictthaneREC,becauseeREgeneratesfrequencyforairtransmissionPTPSynchronizationperITU-TTelecomProfileMobileFronthaulTesting12ECPRI测试原理和测试方法eCPRISynchronizationTestingRequirementsSource:RequirementsfortheeCPRITransportNetworkMobileFronthaulTesting13ECPRI测试原理和测试方法DefinedintheeCPRITransportNetworkRequirementsshallmeetthefollowingthefollowingcriteria:TransportNetworkTestingRequirementsMobileFronthaulTesting14ECPRI测试原理和测试方法RoEStandard:IEEE1914.3CPRIencapsulatedintoEthernetInProcessofbeingstandardizedwithplanned2017releaseRoEtakesexistingCPRIframesandencapsulatesintoEthernetframesoralternativelytakesfrequencydomainI/QdataandencapsulatesintoEthernetRoEiscompatiblewithexistingCPRIwhereaseCPRIisacompletelynewprotocolnotbackwardcompatiblewithCPRIPossiblyRoEandeCPRIwillcohabitRoEusedforexisting4G-LTEdeploymentand