3GPP规范-R15-TS38系列NR38321-f00

3G ppt 关于艾滋病ppt课件精益管理ppt下载地图下载ppt可编辑假如ppt教学课件下载triz基础知识ppt S38.321V15.0.0(2017-12)TechnicalSpecification3rdGenerationPartnershipProject;TechnicalSpecificationGroupRadioAccessNetwork;NR;MediumAccessControl(MAC)protocolspecification(Release15)Thepresentdocumenthasbeendevelopedwithinthe3rdGenerationPartnershipProject(3GPPTM)andmaybefurtherelaboratedforthepurposesof3GPP.Thepresentdocumenthasnotbeensubjecttoanyapprovalprocessbythe3GPPOrganizationalPartnersandshallnotbeimplemented.ThisSpecificationisprovidedforfuturedevelopmentworkwithin3GPPonly.TheOrganizationalPartnersacceptnoliabilityforanyuseofthisSpecification.SpecificationsandReportsforimplementationofthe3GPPTMsystemshouldbeobtainedviathe3GPPOrganizationalPartners'PublicationsOffices.3GPPPostaladdress3GPPsupportofficeaddress650RoutedesLucioles-SophiaAntipolisValbonne-FRANCETel.:+33492944200Fax:+33493654716Internethttp://www.3gpp.orgCopyrightNotificationNopartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©2017,3GPPOrganizationalPartners(ARIB,ATIS,CCSA,ETSI,TSDSI,TTA,TTC).Allrightsreserved.UMTS™isaTradeMarkofETSIregisteredforthebenefitofitsmembers3GPP™isaTradeMarkofETSIregisteredforthebenefitofitsMembersandofthe3GPPOrganizationalPartnersLTE™isaTradeMarkofETSIregisteredforthebenefitofitsMembersandofthe3GPPOrganizationalPartnersGSM®andtheGSMlogoareregisteredandownedbytheGSMAssociationContents5Foreword1Scope62References63Definitions,symbolsandabbreviations63.1Definitions63.2Abbreviations74General74.1Introduction74.2MACarchitecture74.2.1General74.2.2MACEntities84.3Services94.3.1Servicesprovidedtoupperlayers94.3.2Servicesexpectedfromphysicallayer94.4Functions94.5Channelstructure104.5.1General104.5.2TransportChannels104.5.3LogicalChannels104.5.4MappingofTransportChannelstoLogicalChannels104.5.4.1General104.5.4.2Uplinkmapping114.5.4.3Downlinkmapping115MACprocedures115.1RandomAccessprocedure115.1.1RandomAccessprocedureinitialization115.1.2RandomAccessResourceselection135.1.3RandomAccessPreambletransmission145.1.4RandomAccessResponsereception155.1.5ContentionResolution175.1.6CompletionoftheRandomAccessprocedure185.2MaintenanceofUplinkTimeAlignment185.3DL-SCHdatatransfer195.3.1DLAssignmentreception195.3.2HARQoperation215.3.2.1HARQEntity215.3.2.2HARQprocess215.3.3Disassemblyanddemultiplexing225.4UL-SCHdatatransfer225.4.1ULGrantreception225.4.2HARQoperation235.4.2.1HARQEntity235.4.2.2HARQprocess255.4.3Multiplexingandassembly255.4.3.1Logicalchannelprioritization255.4.3.1.1General255.4.3.1.2Selectionoflogicalchannels265.4.3.1.3Allocationofresources265.4.3.2MultiplexingofMACControlElementsandMACSDUs275.4.4SchedulingRequest275.4.5BufferStatusReporting285.4.6PowerHeadroomReporting305.5PCHreception315.6BCHreception325.7DiscontinuousReception(DRX)325.8Transmissionandreceptionwithoutdynamicscheduling345.8.1Downlink345.8.2Uplink345.9Activation/DeactivationofSCells355.10Activation/DeactivationofPDCPduplication365.11MACreconfiguration375.12MACReset375.13Handlingofunknown,unforeseenanderroneousprotocoldata375.14Handlingofmeasurementgaps385.15BandwidthPart(BWP)operation385.16SULoperation395.17BeamFailureRecoveryRequestprocedure396ProtocolDataUnits,formatsandparameters406.1ProtocolDataUnits406.1.1General406.1.2MACPDU(DL-SCHandUL-SCHexcepttransparentMACandRandomAccessResponse)406.1.3MACControlElements(CEs)416.1.3.1BufferStatusReportMACCEs416.1.3.2C-RNTIMACCE456.1.3.3UEContentionResolutionIdentityMACCE456.1.3.4TimingAdvanceCommandMACCE456.1.3.5DRXCommandMACCE466.1.3.6LongDRXCommandMACCE466.1.3.7ConfiguredGrantConfirmationMACCE466.1.3.8SingleEntryPHRMACCE466.1.3.9MultipleEntryPHRMACCE476.1.3.10SCellActivation/DeactivationMACCEs496.1.3.11DuplicationActivation/DeactivationMACCE506.1.4MACPDU(transparentMAC)506.1.5MACPDU(RandomAccessResponse)516.2Formatsandparameters516.2.1MACsubheaderforDL-SCHandUL-SCH516.2.2MACsubheaderforRandomAccessResponse526.2.3MACpayloadforRandomAccessResponse537Variablesandconstants537.1RNTIvalues537.2BackoffParametervalues53AnnexA(informative):Changehistory55ForewordThisTechnicalSpecificationhasbeenproducedbythe3rdGenerationPartnershipProject(3GPP).ThecontentsofthepresentdocumentaresubjecttocontinuingworkwithintheTSGandmaychangefollowingformalTSGapproval.ShouldtheTSGmodifythecontentsofthepresentdocument,itwillbere-releasedbytheTSGwithanidentifyingchangeofreleasedateandanincreaseinversionnumberasfollows:Versionx.y.zwhere:xthefirstdigit:1presentedtoTSGforinformation;2presentedtoTSGforapproval;3orgreaterindicatesTSGapproveddocumentunderchangecontrol.ytheseconddigitisincrementedforallchangesofsubstance,i.e.technicalenhancements,corrections,updates,etc.zthethirddigitisincrementedwheneditorialonlychangeshavebeenincorporatedinthedocument.1ScopeThepresentdocumentspecifiestheNRMACprotocol.2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.-Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon‑specific.-Foraspecificreference,subsequentrevisionsdonotapply.-Foranon-specificreference,thelatestversionapplies.Inthecaseofareferencetoa3GPPdocument(includingaGSMdocument),anon-specificreferenceimplicitlyreferstothelatestversionofthatdocumentinthesameReleaseasthepresentdocument.[1]3GPP TR 21.905:"Vocabularyfor3GPPSpecifications".[2]3GPPTS38.300:"NR;Overalldescription;Stage2".[3]3GPPTS38.322:"NR;RadioLinkControl(RLC)protocolspecification".[4]3GPPTS38.323:"NR;PacketDataConvergenceProtocol(PDCP)protocolspecification".[5]3GPPTS38.331:"NR;RadioResourceControl(RRC);Protocolspecification".[6]3GPPTS38.213:"NR;PhysicalLayerProceduresforcontrol".[7]3GPPTS38.214:"NR;PhysicalLayerProceduresfordata".[8]3GPPTS38.211:"NR;Physicalchannelsandmodulation".[9]3GPPTS38.212:"NR;Multiplexingandchannelcoding".[10]3GPPTS38.101:"NR;UserEquipment(UE)radiotransmissionandreception".[11]3GPPTS38.133:"NR;Requirementsforsupportofradioresourcemanagement".[12]3GPPTS36.133:"EvolvedUniversalTerrestrialRadioAccess(E-UTRA);Requirementsforsupportofradioresourcemanagement".3Definitions,symbolsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thetermsanddefinitionsgivenin3GPPTR 21.905 [1]andthefollowingapply.Atermdefinedinthepresentdocumenttakesprecedenceoverthedefinitionofthesameterm,ifany,in3GPPTR 21.905 [1].HARQinformation:HARQinformationforDL-SCHorforUL-SCHtransmissionsconsistsofNewDataIndicator(NDI),TransportBlocksize(TBS),RedundancyVersion(RV),andHARQprocessID.Msg3:MessagetransmittedonUL-SCHcontainingaC-RNTIMACCEorCCCHSDU,submittedfromupperlayerandassociatedwiththeUEContentionResolutionIdentity,aspartofarandomaccessprocedure.PDCCHoccasion:Atimeduration(i.e.oneoraconsecutivenumberofsymbols)duringwhichtheMACentityisconfiguredtomonitorthePDCCH.ServingCell:APrimaryoraSecondaryCellinTS38.331[5].SpecialCell:ForDualConnectivityoperationthetermSpecialCellreferstothePCelloftheMCGorthePSCelloftheSCGdependingoniftheMACentityisassociatedtotheMCGortheSCG,respectively.OtherwisethetermSpecialCellreferstothePCell.ASpecialCellsupportsPUCCHtransmissionandcontentionbasedRandomAccess.TimingAdvanceGroup:AgroupofServingCellsthatisconfiguredbyRRCandthat,forthecellswithanULconfigured,usingthesametimingreferencecellandthesameTimingAdvancevalue.ATimingAdvanceGroupcontainingtheSpCellofaMACentityisreferredtoasPTAG,whereasthetermSTAGreferstootherTAGs.3.2AbbreviationsForthepurposesofthepresentdocument,theabbreviationsgivenin3GPPTR 21.905[1]andthefollowingapply.Anabbreviationdefinedinthepresentdocumenttakesprecedenceoverthedefinitionofthesameabbreviation,ifany,in3GPPTR 21.905 [1].BSRBufferStatusReportBWPBandwidthPartCEControlElementCS-RNTIConfiguredSchedulingRNTILCGLogicalChannelGroupMCGMasterCellGroupPHRPowerHeadroomReportPTAGPrimaryTimingAdvanceGroupSCGSecondaryCellGroupSISystemInformationSpCellSpecialCellSPSSemi-PersistentSchedulingSRSchedulingRequestSSSynchronizationSignalsSSBSynchronizationSignalBlockSTAGSecondaryTimingAdvanceGroupSULSupplementaryUplinkTAGTimingAdvanceGroupTPC-CS-RNTITransmitPowerControl-ConfiguredScheduling-RNTITPC-PUCCH-RNTITransmitPowerControl-PhysicalUplinkControlChannel-RNTITPC-PUSCH-RNTITransmitPowerControl-PhysicalUplinkSharedChannel-RNTITPC-SRS-RNTITransmitPowerControl-SoundingReferenceSymbols-RNTI4General4.1IntroductionTheobjectiveofthissectionistodescribetheMACarchitectureandtheMACentityoftheUEfromafunctionalpointofview.4.2MACarchitecture4.2.1GeneralThissubclausedescribesamodeloftheMACi.e.itdoesnotspecifyorrestrictimplementations.RRCisincontroloftheMACconfiguration.4.2.2MACEntitiesTheMACentityoftheUEhandlesthefollowingtransportchannels:-BroadcastChannel(BCH);-DownlinkSharedChannel(s)(DL-SCH);-PagingChannel(PCH);-UplinkSharedChannel(s)(UL-SCH);-RandomAccessChannel(s)(RACH).InDualConnectivity,twoMACentitiesareconfiguredtotheUE:onefortheMCGandonefortheSCG.IftheMACentityisconfiguredwithoneormoreSCells,therearemultipleDL-SCHandtheremaybemultipleUL-SCHaswellasmultipleRACHperMACentity;oneDL-SCHandUL-SCHontheSpCell,oneDL-SCH,zerooroneUL-SCHandzerooroneRACHforeachSCell.Figure4.2.2-1illustratesonepossiblestructureoftheMACentitywhenSCGisnotconfigured.Figure4.2.2-1:MACstructureoverviewFigure4.2.2-2illustratesonepossiblestructurefortheMACentitieswhenMCGandSCGareconfigured.Figure4.2.2-2:MACstructureoverviewwithtwoMACentities4.3Services4.3.1ServicesprovidedtoupperlayersTheMACsublayerprovidesthefollowingservicestoupperlayers:-datatransfer;-radioresourceallocation.4.3.2ServicesexpectedfromphysicallayerTheMACsublayerexpectsthefollowingservicesfromthephysicallayer:-datatransferservices;-signallingofHARQfeedback;-signallingofSchedulingRequest;-measurements(e.g.ChannelQualityIndication(CQI)).ADL-SCHmaysupportreceptionsusingdifferentnumerologiesand/orTTIdurationwithintheMACentity.AUL-SCHmayalsosupporttransmissionsusingdifferentnumerologiesand/orTTIdurationwithintheMACentity.4.4FunctionsTheMACsublayersupportsthefollowingfunctions:-mappingbetweenlogicalchannelsandtransportchannels;-multiplexingofMACSDUsfromoneordifferentlogicalchannelsontotransportblocks(TB)tobedeliveredtothephysicallayerontransportchannels;-demultiplexingofMACSDUsfromoneordifferentlogicalchannelsfromtransportblocks(TB)deliveredfromthephysicallayerontransportchannels;-schedulinginformationreporting;-errorcorrectionthroughHARQ;-logicalchannelprioritisation.TherelevanceofMACfunctionsforuplinkanddownlinkisindicatedinTable4.4-1.Table4.4-1:ThelinkdirectionassociationofMACfunctions. MACfunction Downlink Uplink Mappingbetweenlogicalchannelsandtransportchannels X X Multiplexing X Demultiplexing X Schedulinginformationreporting X ErrorcorrectionthroughHARQ X X LogicalChannelprioritisation X4.5Channelstructure4.5.1GeneralTheMACsublayeroperatesonthechannelsdefinedbelow;transportchannelsareSAPsbetweenMACandLayer1,logicalchannelsareSAPsbetweenMACandRLC.4.5.2TransportChannelsTheMACsublayerusesthetransportchannelslistedinTable4.5.2-1below.Table4.5.2-1:TransportchannelsusedbyMAC Transportchannelname Acronym Downlink Uplink BroadcastChannel BCH X DownlinkSharedChannel DL-SCH X PagingChannel PCH X UplinkSharedChannel UL-SCH X RandomAccessChannel RACH X4.5.3LogicalChannelsTheMACsublayerprovidesdatatransferservicesonlogicalchannels.Toaccommodatedifferentkindsofdatatransferservices,multipletypesoflogicalchannelsaredefinedi.e.eachsupportingtransferofaparticulartypeofinformation.Eachlogicalchanneltypeisdefinedbywhattypeofinformationistransferred.TheMACsublayerprovidesthecontrolandtrafficchannelslistedinTable4.5.3-1below.Table4.5.3-1:LogicalchannelsprovidedbyMAC. Logicalchannelname Acronym Controlchannel Trafficchannel BroadcastControlChannel BCCH X PagingControlChannel PCCH X CommonControlChannel CCCH X DedicatedControlChannel DCCH X DedicatedTrafficChannel DTCH X4.5.4MappingofTransportChannelstoLogicalChannels4.5.4.1GeneralBothforuplinkanddownlink,theMACentityisresponsibleformappinglogicalchannelsontotransportchannels.ThismappingdependsonthemultiplexingthatisconfiguredbyRRC.4.5.4.2UplinkmappingTheuplinklogicalchannelscanbemappedasdescribedinTable4.5.4.2-1.Table4.5.4.2-1:Uplinkchannelmapping. TransportchannelLogicalchannel UL-SCH RACH CCCH X DCCH X DTCH X 4.5.4.3DownlinkmappingThedownlinklogicalchannelscanbemappedasdescribedinTable4.5.4.3-1.Table4.5.4.3-1:Downlinkchannelmapping. TransportchannelLogicalchannel BCH PCH DL-SCH BCCH X X PCCH X CCCH X DCCH X DTCH X5MACprocedures5.1RandomAccessprocedure5.1.1RandomAccessprocedureinitializationTheRandomAccessproceduredescribedinthissubclauseisinitiatedbyaPDCCHorder,bytheMACentityitself,bybeamfailureindicationfromlowerlayer,orbyRRCfortheeventsinaccordancewithTS38.300[2].ThereisonlyoneRandomAccessprocedureongoingatanypointintimeinaMACentity.TheRandomAccessprocedureonanSCellotherthanPSCellshallonlybeinitiatedbyaPDCCHorderwithra-PreambleIndexdifferentfrom0b000000.NOTE1:IftheMACentityreceivesarequestforanewRandomAccessprocedurewhileanotherisalreadyongoingintheMACentity,itisuptoUEimplementationwhethertocontinuewiththeongoingprocedureorstartwiththenewprocedure(e.g.forSIrequest).RRCconfiguresthefollowingparametersfortheRandomAccessprocedure:-prach-ConfigIndex:theavailablesetofPRACHresourcesforthetransmissionoftheRandomAccessPreamble;-ra-PreambleInitialReceivedTargetPower:initialpreamblepower;-rsrp-ThresholdSSB,csirs-dedicatedRACH-Threshold,andsul-RSRP-Threshold:anRSRPthresholdfortheselectionoftheSSblockandcorrespondingPRACHresource;-ra-PreamblePowerRampingStep:thepower-rampingfactor;-ra-PreambleIndex:RandomAccessPreamble;-ra-PreambleTx-Max:themaximumnumberofpreambletransmission;-ifSSBsaremappedtopreambles:-startIndexRA-PreambleGroupA,numberOfRA-Preambles,andnumberOfRA-PreamblesGroupAforeachSSBineachgroup(SpCellonly).-else:-startIndexRA-PreambleGroupA,numberOfRA-Preambles,andnumberOfRA-PreamblesGroupAineachgroup(SpCellonly).-IfnumberOfRA-PreamblesGroupAisequaltonumberOfRA-Preambles,thereisnoRandomAccessPreamblesgroupB.-ThepreamblesinRandomAccessPreamblegroupAarethepreamblesstartIndexRA-PreambleGroupAtostartIndexRA-PreambleGroupA+numberOfRA-PreamblesGroupA–1;-ThepreamblesinRandomAccessPreamblegroupB,ifexists,arethepreamblesstartIndexRA-PreambleGroupA+numberOfRA-PreamblesGroupAtostartIndexRA-PreambleGroupA+numberOfRA-Preambles–1.NOTE2:ifrandomAccessPreamblesgroupBissupportedbythecellandSSBsaremappedtopreambles,randomaccesspreamblesgroupBisincludedineachSSB.-ifRandomAccessPreamblesgroupBexists:-ra-Msg3SizeGroupA(percell):thethresholdtodeterminethegroupsofRandomAccessPreambles.-thesetofRandomAccessPreamblesforSIrequestandcorrespondingPRACHresource(s),ifany;-thesetofRandomAccessPreamblesforbeamfailurerecoveryrequestandcorrespondingPRACHresource(s),ifany;-ra-ResponseWindow:thetimewindowtomonitorRAresponse(s);-bfr-ResponseWindow:thetimewindowtomonitorresponse(s)onbeamfailurerecoveryrequest;-ra-ContentionResolutionTimer:theContentionResolutionTimer(SpCellonly).Inaddition,thefollowinginformationforrelatedServingCellisassumedtobeavailableforUEs:-ifRandomAccessPreamblesgroupBexists:-iftheMACEntityisconfiguredwithsupplementaryUplink,andSULcarrierisselectedforperformingRandomAccessProcedure:-PCMAX,c_SUL:theconfiguredUEtransmittedpoweroftheSULcarrier.-else:-PCMAX,c:theconfiguredUEtransmittedpoweroftheServingCellperformingtheRandomAccessProcedure.ThefollowingUEvariablesareusedfortheRandomAccessprocedure:-PREAMBLE_INDEX;-PREAMBLE_TRANSMISSION_COUNTER;-PREAMBLE_POWER_RAMPING_COUNTER;-PREAMBLE_RECEIVED_TARGET_POWER;-PREAMBLE_BACKOFF;-PCMAX;-TEMPORARY_C-RNTI.WhentheRandomAccessprocedureisinitiated,theMACentityshall:1>flushtheMsg3buffer;1>setthePREAMBLE_TRANSMISSION_COUNTERto1;1>setthePREAMBLE_POWER_RAMPING_COUNTERto1;1>setthePREAMBLE_BACKOFFto0ms;1>ifthecarriertousefortheRandomAccessprocedureisexplicitlysignalled:2>selectthesignalledcarrierforperformingRandomAccessprocedure.1>elseifthecarriertousefortheRandomAccessprocedureisnotexplicitlysignalled;and1>ifthecellfortheRandomAccessprocedureisconfiguredwithsupplementaryUplink;and1>iftheRSRPofthedownlinkpathlossreferenceislessthansul-RSRP-Threshold:2>selecttheSULcarrierforperformingRandomAccessprocedure;2>setthePCMAXtoPCMAX,c_SUL.1>else:2>selectthenormalcarrierforperformingRandomAccessprocedure;2>setthePCMAXtoPCMAX,c.1>performtheRandomAccessResourceselectionprocedure(seesubclause5.1.2).5.1.2RandomAccessResourceselectionTheMACentityshall:1>iftheRandomAccessprocedurewasinitiatedbyabeamfailureindicationfromlowerlayer;and1>ifthecontentionfreePRACHresourcesforbeamfailurerecoveryrequestassociatedwithanyoftheSSblocksand/orCSI-RSshavebeenexplicitlyprovidedbyRRC;and1>ifatleastoneoftheSSblockswithSS-RSRPaboversrp-ThresholdSSBamongsttheassociatedSSblocksortheCSI-RSswithCSI-RSRPabovecsirs-dedicatedRACH-ThresholdamongsttheassociatedCSI-RSsisavailable:2>selectanSSblockwithSS-RSRPaboversrp-ThresholdSSBamongsttheassociatedSSblocksoraCSI-RSwithCSI-RSRPabovecsirs-dedicatedRACH-ThresholdamongsttheassociatedCSI-RSs;2>setthePREAMBLE_INDEXtoara-PreambleIndexcorrespondingtotheselectedSSblockorCSI-RSfromthesetofRandomAccessPreamblesforbeamfailurerecoveryrequest.1>elseifthera-PreambleIndexhasbeenexplicitlyprovidedbyeitherPDCCHorRRC;and1>ifthera-PreambleIndexisnot0b000000;and1>ifcontentionfreePRACHresourceassociatedwithSSblocksorCSI-RShavenotbeenexplicitlyprovidedbyRRC:2>setthePREAMBLE_INDEXtothesignalledra-PreambleIndex.1>elseifthecontentionfreePRACHresourcesassociatedwithSSblockshavebeenexplicitlyprovidedbyRRCandatleastoneSSblockwithSS-RSRPaboversrp-ThresholdSSBamongsttheassociatedSSblocksisavailable:2>selectanSSblockwithSS-RSRPaboversrp-ThresholdSSBamongsttheassociatedSSblocks;2>setthePREAMBLE_INDEXtoara-PreambleIndexcorrespondingtotheselectedSSblock.1>elseifthecontentionfreePRACHresourcesassociatedwithCSI-RSshavebeenexplicitlyprovidedbyRRCandatleastoneCSI-RSwithCSI-RSRPabovecsirs-dedicatedRACH-ThresholdamongsttheassociatedCSI-RSsisavailable:2>selectaCSI-RSwithCSI-RSRPabovecsirs-dedicatedRACH-ThresholdamongsttheassociatedCSI-RSs;2>setthePREAMBLE_INDEXtoara-PreambleIndexcorrespondingtotheselectedCSI-RS.1>else:2>selectaSSblockwithSS-RSRPaboversrp-ThresholdSSB;2>ifMsg3hasnotyetbeentransmitted:3>ifRandomAccessPreamblesgroupBexists;and3>ifthepotentialMsg3size(ULdataavailablefortransmissionplusMACheaderand,whererequired,MACCEs)isgreaterthanra-Msg3SizeGroupAandthepathlossislessthanPCMAX(oftheServingCellperformingtheRandomAccessProcedure)–ra-PreambleInitialReceivedTargetPower:4>selecttheRandomAccessPreamblesgroupB.3>else:4>selecttheRandomAccessPreamblesgroupA.2>else(i.e.Msg3isbeingretransmitted):3>selectthesamegroupofRandomAccessPreamblesaswasusedforthepreambletransmissionattemptcorrespondingtothefirsttransmissionofMsg3.2>iftheassociationbetweenRandomAccessPreamblesandSSblocksisconfigured:3>selectara-PreambleIndexrandomlywithequalprobabilityfromtherandomaccesspreamblesassociatedwiththeselectedSSblockandtheselectedgroup.2>else:3>selectara-PreambleIndexrandomlywithequalprobabilityfromtherandomaccesspreambleswithintheselectedgroup.2>setthePREAMBLE_INDEXtotheselectedra-PreambleIndex.1>ifanSSblockisselectedaboveandanassociationbetweenPRACHoccasionsandSSblocksisconfigured:2>determinethenextavailablePRACHoccasionfromthePRACHoccasionscorrespondingtotheselectedSSblock.1>elseifaCSI-RSisselectedaboveandanassociationbetweenPRACHoccasionsandCSI-RSsisconfigured:2>determinethenextavailablePRACHoccasionfromthePRACHoccasionscorrespondingtotheselectedCSI-RS.1>else:2>determinethenextavailablePRACHoccasion.1>performtheRandomAccessPreambletransmissionprocedure(seesubclause5.1.3).5.1.3RandomAccessPreambletransmissionTheMACentityshall,foreachpreamble:1>ifPREAMBLE_TRANSMISSION_COUNTERisgreaterthanone;and1>ifthenotificationofsuspendingpowerrampingcounterhasnotbeenreceivedfromlowerlayers;and1>ifSSblockselectedisnotchanged(i.e.sameasthepreviousrandomacces