2023学年完整公开课版PhysicalChannelsof5G

PhysicalChannelsof5GMobileCommunicationTechnologyLecturer：GuYanhuaUuinterfaceprotocolstackstructureL1isusedtoprovideawirelessphysicalchannelforhigh-levelservices.L2Layerincludes:

MAC（MediumAccessControl）

RLC（RadioLinkControl）

BMC（Broadcast/MulticastControl）

PDCP（PacketDataConvergenceProtocol）L2Layerincludes:Accesslayer

RRC（RadioResourceControl)Non-Accesslayer

MM（MobilityManagement）

CC（CallControl）PhysicalLayer：PhysicalChannelBetweenPHYandMAC：TransmissionChannelBetweenMACandRLC:LogicalChannelDefinitionofvariouschannelsLogicalchannelistheserviceprovidedbyMACsub-layertotheupperlayer,indicatingwhatiscarried.Itisdividedintotwocategoriesaccordingtotheinformationcontent:controlchannelandservicechannel.LogicalChannelTransmissionChannelTransmissionchannelsindicatehowandinwhatformattheloadedcontentistransmitted.Theyaredividedintotwocategories:dedicatedtransmissionchannelsandpublictransmissionchannels.PhysicalChannelPhysicallayerprotocolsdefinedifferentphysicalchannelsbasedonthetransmittedcontentandresourceusage(suchasfrequencyandtime).Thatis,differentdataflowsofthetransmissionchannelareprocessedandtransmittedindifferentprocessingmodes.Definitionofvariouschannelslogicalchannel={allusers(includingthebasestation,terminal)puredatacollection}Forexample,someonewritesalettertoafriendtransmissionchannel={definetransmissioncharacteristicparametersandspecificprocessingafterallusersofthedatacollection}physicalchannel={definethephysicalmediacharacteristicparametersofeachuser'sdatatransferinacollectivename}logicalchannel=thecontentofthelettertransmissionchannel=ordinarymail,registeredmail,airexpress,etc.Physicalchannel=theletterwithaddressandstampPhysicalSignal=signalthatassistsinchanneldatatransmission0102UplinkPhysicalChannelDownlinkPhysicalChannelCONTENT01PhysicalUplinkChannelPARTONEPhysicalChannelof5GTheuplinkphysicalchannelisusedtocarrymessagesfromterminalstobasestations.

PUCCH（PhysicalUplinkControlChannel）PUSCH（PhysicalUplinkSharedChannel）PRACH（PhysicalRandomAccessChannel）Physicalchannel:responsibleforencoding,modulation,multi-antennaprocessingandmappingfromsignalstoappropriatephysicaltime-frequencyresources.

Basedonthemappingrelationship,ahigh-leveltransportchannelcanserveoneormorephysicalchannelsatthephysicallayer.

Downlinkphysicalchannelsareusedtocarrymessagesfromthebasestationtotheterminal.

PBCH（PhysicalBroadcastChannel）PDCCH（PhysicalDownlinkControlChannel）PDSCH（PhysicalDownlinkSharedChannel）UEgNodBuplinkdownlink图例5GUplinkPhysicalChannelComparedwithLTE,PUSCHadds256QAMmodulationmodePUSCH：PhysicalUplinkSharedChannelModulationMode:QPSK,16QAM,64QAM，256QAMCarriesuser-specificdataPRACH:PhysicalRandomAccessChannelModulationMode：QPSKcarriesrandomaccessleadandadoptsQPSKmodulationmode.

PUCCH：PhysicalUplinkControlChannelModulationMode：QPSKCarriesACK/NACK,SR(schedulingrequest),CSI-report(PMI,CQI,etc.)UplinkPhysicalChannelPRACHChannelRandomaccesssignalismainlyusedforUEtosendrandomaccesslead,soastocompleteuplinksynchronizationwithbasestationandrequest

basestationtoallocateresources.

Randomaccessisusedinvariousscenarios,suchasinitialaccess,switchover,andreconstruction.

Likeother3GPPsystems,randomaccessprovidesbothcontent-basedandnon-content-basedaccess.

ThesignaltransmittedinphysicalrandomaccesschannelistherandomaccessleadgeneratedbyZCsequence.

ThePRACHleadconsistsofthefollowingtwoparts:cyclicprefix(CP)andleadingSequence.CPlengthvarieswithSequencelength.02PhysicalDownlinkChannelPARTTWODownlinkPhysicalChannelComparedwithLTE,5GsimplifiesPCFICH,PHICHandotherchannels,whilePDSCHadds1024QAMmodulationmodetoimprovedownlinkrate.PBCH：PhysicalbroadcastchannelModulationMode:QPSKbroadcastforsystemmessageMIBPDCCH：PhysicaldownlinkcontrolchannelModulationMode:QPSKcarryschedulingandtransmissionformat,HARQinformation,etc.DownlinkPhysicalChannelPDSCH：physicaldownlinksharedchannelModulationMode:QP