主要技术介绍

LTE主要技术介COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL

通信人才网 2COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALLRIGHTS通信人才网 LTE标准演COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL

通信人才网 3GPP标准演Release9:Stage3Dec

Release10:Stage3Dec

KickoffinRANLTEworkshopNov2004

Dec2004

LTEWorkItemMarch

Release8:LTEStage3“complete”Dec4COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL

通信人才网 LTE协议标准介5COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALLRIGHTS通信人才网 Release作为第一版的LTE标准，Rel- 年月冻Rel-8的主要内容包括以下几个方IMS,OAM-6COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 ReleaseRel- 年月冻结，在LTE方面主要有以下新内容definitionofLTEPicoBSRFrequirementsforLTEPicoBSintroductionofBStransmissionandreceptionrequirements,butnonewbasebandperformanceupdateofconformancetestdual-layerBFRel-8single-layBF,和边缘用户体验，Rel-9定义了dual-layerBF。MBMS,SON7COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 Release10LTECarrierEnhancedDownlinkMultipleAntennaTransmissionforUplinkMultipleAntennaTransmissionforRelaysforEnhancedICICfornon-CAbasedLTESONHNBandHeNBMobilityFurtherEnhancementstoMBMSforMinimizationofDriveTestforE-UTRANandLocalIPInDeviceco-existenceandinterferenceNetworkImprovementsforMachine-TypeLTETDDin2600MHzforFixedWirelessCustomer-PremisesEquipment(CPE)RFAdding2GHzbandLTEforATCofMSSinNorthAddingL-BandLTEforATCofMSSinNorthExpanded1900MHzBandforUTRAandExtending850MHz(Feature)-UpperBand(814–8498COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 Release10LTECarrierTofulfiltheLTE-Advancedrequirementsasspecifiedin36.913,LTE-Advancedneedstoalsosupportwidertransmissionbandwidthsthanthecurrentlysupported20MHzspecifiedinRel.8/9whilemaintainingthebackwardscompatibilitywithRel-8/9.ThepreferredsolutiontothisiscarrieraggregationasdefinedduringtheLTE-Advancedstudyitem,wheremultiplecomponentcarriersareaggregatedtoformalargeroveralltransmissionbandwidthEnhancedDownlinkMultipleAntennaTransmissionforEnhancedmulti-antennaoperationforsupportingdownlinkSU-MIMOwithuptoeightlayerspatialmultiplexingisneededtofulfiltargetinTR36.913forLTE-Advancedonpeakratespectralefficiencyof30b/s/Hz.UplinkMultipleAntennaTransmissionforThemulti-antennaoperationforsupportingULSU-MIMOwithuptofourlayerspatialmultiplexingisneededtofulfilrequirementsinTR36.913forLTE-Advancedonpeakratespectralefficiencyof15b/s/Hz.DuringtheLTE-Advancedstudyitem,ULtransmissiondiversityforPUCCHandcodebookbasedtransmissionforPUSCHwillhelpensurethatLTE-Advancedsystemdeploymentsoffergoodcelledgeandaverageperformance.9COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 Release10LTERelaysforRelayshavebeenstudiedaspartoftheLTE-Advancedstudyitem.OneoftheprimeperceivedbenefitsofrelayingistoprovideextendedLTEcoverageintargetedareasatlowcost.ProvidingthisfeatureasearlyaspossibleisthuscrucialtoenableoperatorstomeetuserexpectationsforLTE, isetake-upofLTEFurtherenhancementstoMBMSforInRel-9acoresetofMBMSfeatureswasspecified.ThereisaneedtofurtherevolvethisfeaturesetinordertomaketheMBMSofLTEcompetitive.COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 3GPP36seriesRANRANRAN

Layer1GeneralDescriptionPhysicalchannelandmodulationMultiplexingandchannelcodingLayer1procedureLayer1EUTRANoveralldescription(stage2)ServicesprovidedbyLayer1UEprocedureinIdleModeUEcapabilitiesLayer2–MeasurementsS1generaldescriptionS1layer1S1signalingS1datatransportX2generaldescriptionX2layerX2signalingtransportX2data

RANRAN

36.521-UE36.521-UEUERRMconformance36.523-Protocol36.523-36.523-

UETxRxBSTxRepeaterTxRxBSandRepeaterEMCUERRMrequirementsBSconformancetestRepeaterconformanceUEconformance–commontestenvironmentSpecialtestfunctionsUETxRxCOPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL

通信人才网 LTE网络架COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL

通信人才网 LTE全IP扁平化网CS

4

PS5

EPS

PDNCOPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL

通信人才网 EPC架构概 PDN-AF,例如

IPCOPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL

通信人才网 LTE全IP扁平化网COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALLRIGHTS通信人才网 COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL

通信人才网 COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 WhyWhyCOPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALLRIGHTS通信人才网 为什么选择 COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 为什么选择COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 WhatWhatOFDMisBadfor?COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALLRIGHTS通信人才网 OFDM有什么缺点OFDM的另一个显著缺点是很高的峰均比（highpeaktoaverageCOPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 高复杂DFT/FFTDFT/FFTImplementation COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 DFT/FFT在每个OFDM符号之前插入循环前缀（CyclicPrefix,CP）以在多径 COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 均COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 LTE下行多址技术-COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 LTE下行多址技术-COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 LTE上行多址技术-SC集中式：占用连续的频谱，是整个带宽的一部分布式：占用离散频谱，LTE不支COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL

通信人才网 MIMO介 信道的良好抗性（CreateCOPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 MIMO介空时编码（AlamoutiCOPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 MIMO介空时编码（Alamouti

S

-S*1S 0接收端收到的四个独立副本基带信号COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 MIMO介空时编码（Alamouti单一信道发生深 时，对接收端恢复发送信号影响较有4个不同的信道副本，分集数为不能提高吞吐量上述编码分配对 载波f和f+1，则这种编码方式又称作空频编码COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 调制：QPSK16QAM,COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 层映COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 层映COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 预编单天线端口预编码，空间复用预编码OPMIMO:不需要终端上报 具体公式参考COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 MIMO的三种主要工作方发送分集(TX在发射端对数据流进行联合编码以减小由于信道和噪声所导致的符号错误率。数据的混合信号后，利用不同空间信道间独立的特性，区分出这些并行的数据波束赋形(BeamCOPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL MIMO的三种主要工作方 发送分集发送分集(TX C1

S

SFBC编CnSFBC编

SFBC S’

COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL

通信人才网 MIMO的三种主要工作方 发送分集射方式无法获取空间并行信道带来的速率红利，发送分集方案不能提高数据率。当信道间相 低COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 MIMO的三种主要工作方 空分复用空分复用(Spatial┅┅┅┅┅┅┅┅┅COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 MIMO的三种主要工作方 空分复用 CL- OL-高高COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 MIMO的三种主要工作方 波束赋形波束赋形波束成型技术又称为智能天线，通过对多根天线输出信号的相关性进行相位，使COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 DCISearchTransmissionschemeofPDSCHcorrespondingtoPDCCHModeDCISearchTransmissionschemeofPDSCHcorrespondingtoPDCCHModeDCIformatCommonUEspecificbyC-DCIformatUEspecificbyC-ModeDCIformatCommonUEspecificbyC-DCIformatUEspecificbyC-ModeDCIformatCommonUEspecificbyC-DCIformatUEspecificbyC-LargedelayCDD(seesubclause7.1.3)ModeDCIformatCommonUEspecificbyC-DCIformatUEspecificbyC-Closed-loopspatialmultiplexing(seeModeDCIformatCommonUEspecificbyC-DCIformatUEspecificbyC-ModeDCIformatCommonUEspecificbyC-DCIformatUEspecificbyC-Closed-loopspatialmultiplexing(seeModeDCIformatCommonUEspecificbyC-IfthenumberofPBCHantennaportsisone,Single-antennaport,port0isused(seesubclause7.1.1),otherwiseTransmitDCIformatUEspecificbyC-ModeDCIformatCommonUEspecificbyC-IfthenumberofPBCHantennaportsisone,Single-antennaport,port0isused(seesubclause7.1.1),otherwiseTransmitDCIformat©2011ALCA-LUCENTSHANGHAIBELL.ALLDuallayertransmission;port7and8TSRlSRD.通信人才网 LTE物理层介绍-下行物理信COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL

通信人才网 物理资源概念-资源块（Resource子子(PCFICH,PDCCH,PHICH)ResourceBlock=7OFDMSymbolsx1215Slot(0.5 Slot(0.5 Subframe(1COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 物理资源概念-带宽对应资1007550525531536COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 物理资源概念-每个REG包括4个连续可用下行控制域RE集合，用于下行控制信道资源映COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 物理资源概念--控制信道粒CCEcontrolchannel1CCE=9REG=36CCE数目的确 一个PDCCH可映射到，1,2,4,8个PDCCHNumberofNumberofPDCCH01122438COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 总1.435101520Slot0.5Sub-1.0ms(=215kHz(7.5kHzfor1.92(1/23.847.68(215.36(423.04(630.72(8FFTNumbersub-751503006009001200persubframe7(shortCP),6(long4.69sx6,5.21sx16.67COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 LTE下行信道映PCCH:pagingcontrolchannelBCCH:broadcastcontrolchannelCCCH:commoncontrolchannelDCCH:dedicatedcontrolchannelDTCH:dedicatedtrafficchannelPCH:pagingBCH:broadcastDL-SCH:DLshared

LTEmakesheavyuseofsharedchannelscommoncontrol,paging,andpartofbroadcastinformationcarriedonCOPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL

通信人才网 LTE下行链路：公共参考信号（RS）结COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 LTE下行链路：用于1,2和4天线端口的公共RS结COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALLRIGHTS通信人才网 P-SCH&S-SCH,PBCH介COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALLRIGHTS通信人才网 SSS&PSS位 COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网

501234…5

forS-SCH

0S0=(m0,m1)S1=(m1,m0)S2=(m0,m1)S3 RadioRadioframeRadioframesubframe

subframesubframe

TDD:5msperiodicityPSS->lastsymbolinslot#1subframeSSS->the3rdsymbolsubframeCOPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL

通信人才网 物理广播信道物理广播信周期40ms子帧#0，时隙#1，符号72个子载波，占据频带中间多天线时采用发射分集方式发

携带MIB消息共24带宽信PHICH置信息系统帧号 PBCHTTI=Radioframe=10ms Subframe=1ms

CodedBCHtransportCOPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 物理下行公共控制信道PDCCHCCE1,2,4,or876543210n76543210

COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL

通信人才网 物理下行公共控制信道COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALLRIGHTS通信人才网 物理控制格式指示信道

COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 物理HARQ指示信道：COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 移动通 物理下行共享信TransportblockCRCTransportblockCRC CodeblocksegmentationandcodeblockCRCatta Per-code-blockCRCallowspowersavingsindecoderwithearlytermination,alsoallowsparallelprocessingofcodeCodeblocksegmentationandcodeblockCRCatta RateChannelR=1/3turbocodefromUMTSbutwithimprovedturbointerleaver(QPP)whichRateChannelCodeblockSimplifiedcircularbufferratematchingwithsub-blockinterleaving;ratematchingispercodeblocktoallowparallelprocessingCodeblockBit-levelPer-userbitlevelscramblingintroducedforinterferenceBit-levelPDSCHsupportsQPSK,16-QAM,and64-COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 下行信道总TransportDL-

CodingTurboTurboR=1/3

Physical

QPSK,16-QAM,64-

CodingBlockcodeR=1/16RepetitionR=1/3ConvolutionR=1/3dependingonCCEaggregationlevel

Physical

COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL

通信人才网 LTE物理层介绍-上行物理信COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL

通信人才网 上行参考信号COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALLRIGHTS通信人才网 上行参考信号UEUE1UE

DM-RStransmittedonlyoverbandwidthallocatedtoUESRScanbetransmittedoverawidebandwidthtoallowchannelqualityestimationbytheeNBuplinkschedulerCyclicshiftorthogonalsequencesusedtoseparateoutdifferentUEsSRS(8possibleRepetitionfactor(RPF)=2createstwofrequencycombsforincreasedmultiplexingUEUEUE3

Slot=

Slot=

RulesforSRSSRSonlyspansPUSCHSRSisnottransmittedatthesametimeasCQIorSchedulingRequest(SR)onPUCCHShortenedACK/NACKformatisusedonPUCCHtoallowtransmissionofSRSwhilemaintainingsingle-carriertransmissionCOPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL

通信人才网 上行参考信号COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 物理上行控制信所占频率位于系统频率两PUCCH不与PUSCH一起发当存在PUSCH传输时，若需要发送ACK/NACK或者CQI，则其必须与PUSCH复与PUSCH相比，对可靠性的要求更System0.5msSystem

COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL

通信人才网 物理上行控制信COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALLRIGHTS通信人才网 物理随机接入信UE通过解调SCH获得下行同步，然后可以发送前导序eNB通过检测前导序列，发送TA命令给UE用于上行同Maxcellsize(m)=3E8*

GaptimereflectsthetiminguncertaintyduetoroundtrippropagationdelayMax1~0.10.8Max1~0.10.8~0.1~1520.8~0.52~0.21.6~0.2~3031.6~0.7~100Formats#2and#3offera2x0.8mspreamblerepetitiontoimprovedetectionperformanceinpoorchannelconditionsfRA=1/0.8ms=1.25kHz sensitivitytodopplershiftfromhighspeedUEs(greaterthan~120km/hr)Rootsequencelength=839;differentsignaturesaregeneratedbyfirstusingdifferentcyclicshiftsofasinglerootsequence(orthogonal),andthenusingadditionalrootsequencesasneeded(lowCOPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL

通信人才网 物理上行共享信TransportblockTransportblockdecoderwithearlycodeblockCRCdecoderwithearlycodeblockCRC CodeblocksegmentationRateChannelR=1/3turbocodewithimprovedturboRateChannelCodesub-blockinterleaving;ratematchingisCodecontrolBit-levelcontrolBit-level

Muxcontrolwhenneeded;dataisratematchedaroundCQI/PMI,butACK/NACKpuncturesoutdata(keptindep.fromRMtomaintainturn-around)Per-userbitlevelscramblingintroducedforinterferencerandomizationPUSCHsupportsQPSKand16-QAM;64-QAMisCOPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL

通信人才网 RNTI总COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL

通信人才网 RNTI总RNTIRadioNetworkTemporaryWhy在接收信息时，物理层根据的指示，使用特定的RNTI进行PDCCH搜索，根据RNTI根据不同的用途C-RNTICellP-RNTIPagingRA-RNTIRandomAccessSI-RNTISystemInformationTPC-PUCCH-RNTITransmitPowerControl-PhysicalUplinkControlChannel-COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 RNTI总RNTICOPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 RNTI总COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 基本信令流COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL

通信人才网 随机接入过2.1.基于竞争：适用于所有52.DLCOPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 随机接入过of6bitsofdataResponseonDL-

RandomAccess

RandomAccessPreambleInitialULTemporaryC-(foroneormultipleRandomAccessOnUL-SCHwith

ScheduledContention

OnDL-SCH&

UEHARQfeedbackwhenitsIdmatcheswithUEIdechoesinRRCContentionResolutionmessageCOPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL

Variable-sizemessageconsistingofUEId,C-RNTINASmessagecanbe通信人才网 移动通 Preamble–PreambleThereare64preamblesavailableineachIfIfUEhavelargesizeMSG3andgoodradioitwillselectGroupCOPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 RAProcedures----Initial plusthree

message-DetectPreambleIndex,-AllocateTempC--DetectPreambleIndex,-AllocateTempC-RamdonPreambleIndex,f_id,message2(PDCCHaddressonRA-PreambleIndex=SaveTempC--GenerateandsaveULCCCHSDUPDSCH:{1ornPreambleIndex=SaveTempC--GenerateandsaveULCCCHSDU-CompareUEContentionResolutionIDwithULCCCHSDU,ifequal:setC-RNTI<=TempC-RNTI;deliveryDLCCCHSDUtoRRCContentionresolved,RA

message3(PUSCH:UL-SCH:SRB0:CCCHeNBfoundthereisCCCHSDUinreceivedMAC,saveeNBfoundthereisCCCHSDUinreceivedMAC,savetheCCCHSDUforthisTempC-RNTI(s-TMSIorRandomValueisGenerateDLCCCHSDU,"UEContentionResolutionGenerateDLCCCHSDU,"UEContentionResolution=ULCCCHPDSCH:{UEContentionResolutionId,DL-SCH:SRB0:CCCHDLCCCHSDU:RRCCONNECTIONPUSCH:UL-SCH:SRB1:DCCHULDCCHSDU:RRCCONNECTIONSETUPCOPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL

通信人才网 RAProcedures----DLdataarrival

message0(PDCCHaddressonC-PDCCHOrderviaDCI1A{Preamble

-DetectPreambleIndex,-DetectPreambleIndex,-AllocateTempC-RNTIsetTempC-RNTI=C-noinfluenceonUEPreambleIndex,f_id,allocatedbyPRACH:Preambleinat/f-Compare:TempC-RNTIisdiscard,RAsuccess message2(PDCCH-Compare:TempC-RNTIisdiscard,RAsuccessPDSCH:{1ornRAPID,[BI],1ornRAR(TA,ULGrant,TempC-PDSCH:{DLCOPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 下行数据传

PUCCH/ReportedPUCCH/Reported

Scheduling

ControlInformation(PDCCH)Datatransmission(PDSCH)PUCCH/Ack-

COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL

通信人才网 上行数据传

PUCCH/SchedulingPDCCH/Scheduling

SchedulingDatarateselectionatPUCCH/Control&DataPDCCH/Ack-

COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL

通信人才网 COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL

通信人才网 LTE空口协议栈-控制平 COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 LTE空口协议栈-控制平

NASsub-layerSecurityIdlemodemobilityIdlemodepaginggPDCPsub-layergIntegrityprotection&

RRCRRCRadiobearerMobilityUEmeasurementreporting& COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 LTE空口协议栈-用户平 COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 LTE空口协议栈-用户平Physicalsub-layerDL:ODFMA,UL:SC-ULpowerMulti-streamtransmission&reception(i.e.

PDCPsub-layerHeaderRLCsub-layerTransferringupperlayerIn-sequencedeliveryofFlowMACsub-layerErrorcorrectionthroughPriorityhandlingacrossUEs&logicalIn-sequencedeliveryofRLCradiobearersinto/fromPhCHson COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 LTE空口协议总NAS（Non-AccessStratum）非接入层协议，UE与 RRC（RadioResourceControl）层主要通过信令传输来控制UE的行为COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 RRC状态和状态转LTE中RRC只有两种状态：RRC_CONNECTED和RRC_IDLE如果RRC连接已建立，UE处于RRC_CONNECTED状态，如果RRC连接未建，UE处于RRC_IDLE状态RRC_IDLE状态描述特定的DRX配系统信息广寻邻小区测量和小区选

RRC_CONNECTED状态描-特定的DRX配-邻小区测量上-信道质量反COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 DataNoActiveDataNoActiveActivateRFDeactivateRFRRCConnectedAttachtoDetachfromEstablishRRCRRCConnectionAttachedLTEDetachedActiveDetachedIdleUEisengagedinactiveIdleDormantNotnecessarilyactivelyscheduled&sendingDormantEnterExitEnterExitEmptyRRCConnectedUEhasanRRCconnectionCanbeCOPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 LTE各关键状态定COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 LTE各关键状态定,COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 NAS消息传NAS传输是S1接口过程，在UE和MME之间传递信令eNB不做任何处通过三条消息来传递NAS信INITIALUEDOWNLINKNASUPLINKNASCOPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 NAS消息传INITIALUEENB从空口收到第一条 INITIALUEMESSAGE消息。消息中包含：ENBUES1APNASEUTRANCOPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 NAS消息传DOWNLINKNASENBUES1APNASMMEUES1APCOPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 NAS消息传UPLINKNASENBUES1APNASEUTRANMMEUES1APCOPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 NAS消息传NASNONDELIVERYNASNONDELIVERYIND来向MME报告，该消息中包括：ENBUES1APNASCOPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 系统信息广 •系统信息通过系统信息块（SIB）的方式来组织，每一个SIB集合了某 COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 系统信息广COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 系统信息广SI-window在无线帧级别上连续，具有可配置的公共长COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 系统消息广COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 系统消息广LTE通过两种方式来指示系统信息发通过寻呼指示系统消息改 COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 LTE空口协议总 COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 LTE空口协议总TM（透明模式）对于PDCP层来的RLCSDU，RLC层不做任何处理，直接映射到RLCPDU，反 COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 LTE空口协议总COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 LTE空口协议总 COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL

通信人才网 LTE移动性管LTE支持LTE内的移动性，也支持3GPP和非3GPP系统间的移动LTE内的移动性包含两类切换流程，即S1切换流程和X2切换流COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 X2-basedhandoverwithoutServingGW

Downlinkanduplink

PDNForwardingof

Uplinkdata1PathSwitch3

2UserPlaneUpdateUserPlaneUpdate

End

4.EndPathSwitchRequest7.TrackingAreaUpdateCOPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 X2-basedhandoverwithoutServingGW ThetargeteNodeBsendsaPathSwitchRequestmessagetoMMEtoinformthattheUEhaschangedcell,includingtheECGIofthetargetcellandthelistofrejectedEPSbearers.TheMMEdeterminesthattheServingGWcancontinuetoservetheUE TheMMEsendsaUserPlaneUpdateRequest(eNodeBaddress(es)andTEIDsfordownlinkuserplanefortheacceptedEPSbearers)messagetotheServingGW. IncaseanyEPSbearersaretobereleasedtheMMEtriggersthebearerreleaseprocedureasspecifiedinclause. TheServingGWstartssendingdownlinkpacketstothetargeteNodeBusingthenewlyreceivedaddressandTEIDs.AUserPlaneUpdateResponsemessageissentbacktotheMME. InordertoassistthereorderingfunctioninthetargeteNB,theServingGWshallsendonemore"endmarker"packetsontheoldpath yafterswitchingthepathasdefinedTS36.300[5],clause TheMMEconfirmsthePathSwitchRequestmessagewiththePathSwitchRequestAck BysendingReleaseResourcethetargeteNodeBinformssuccessofthehandovertosourceeNodeBandtriggersthereleaseofresources.ThisstepisspecifiedinTS36.300[5]. TheUEinitiatesaTrackingAreaUpdateprocedurewhenoneoftheconditionslistedinclause"Triggersfortrackingareaupdate"applies.COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 X2-basedhandoverwithPDNPDNDownlinkanduplinkdoverdoververexecutionForwardingofd

UplinkPathSwitch4.Create4.Create3a.UpdateBearer3b.UpdateBearerrerer7a.DeletePathSwitchUplinkRelease7b.7b.Deleteerate8.TrackingAreaateCOPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 X2-basedhandoverwithServingGW ThetargeteNodeBsendsaPathSwitchRequestmessagetoMMEtoinformthattheUEhaschangedcell,includingtheECGIofthetargetcellandthelistofrejectedEPSbearers.TheMMEdeterminesthattheServingGWisrelocatedandselectsanewServingGWaccordingtoclauseon"ServingGWSelectionFunction". TheMMEsendsaCreateBearerRequest(bearercontext(s)withPDNGWaddressesandTEIDs(forGTP-basedS5/S8)orGREkeys(forPMIP-basedS5/S8)atthePDNGW(s)foruplinktraffic,eNodeBaddress(es)andTEIDsfordownlinkuserplanefortheacceptedEPSbearers,theProtocolTypeoverS5/S8)messagetothetargetServingGW.ThetargetServingGWallocatestheS-GWaddressesandTEIDsfortheuplinktrafficonS1_Ureferencepoint(oneTEIDperbearer).TheProtocolTypeoverS5/S8isprovidedtoServingGWwhichprotocolshouldbeusedoverS5/S8interface. IncaseanyEPSbearersaretobereleasedtheMMEtriggersthebearerreleaseprocedureasspecifiedinclause. ThetargetServingGWassignsaddressesandTEIDs(oneperbearer)fordownlinktrafficfromthePDNGW.ItsendsanUpdateBearerRequest(ServingGWaddressesforuserplaneandTEID(s))messagetothePDNGW(s).ThePDNGWupdatesitscontextfieldandreturnsanUpdateBearerResponse(PDNGWaddressandTEID,MSISDN,etc.)messagetotheServingGW.TheMSISDNisincludedifthePDNGWhasitstoredinitsUEcontext.ThePDNGWstartssendingdownlinkpacketstothetargetGWusingthenewlyreceivedaddressandTEIDs.ThesedownlinkpacketswillusethenewdownlinkpathviathetargetServingGWtothetargeteNodeB.AnUpdateBearerResponsemessageissentbacktothetargetservingGW. ThetargetServingGWsendsaCreateBearerResponse(ServingGWaddressesanduplinkTEID(s)foruserplane)messagebacktothetargetMME.TheMMEstartsatimer,tobeusedinstep7. TheMMEconfirmsthePathSwitchRequestmessagewiththePathSwitchRequestAck(ServingGWaddressesanduplinkTEID(s)foruserplane)message.ThetargeteNodeBstartsusingthenewServingGWaddress(es)andTEID(s)forforwardingsubsequentuplinkpackets. BysendingReleaseResourcethetargeteNodeBinformssuccessofthehandovertosourceeNodeBandtriggersthereleaseofresources.ThisstepisspecifiedinTS36.300[5]. Whenthetimerhasexpiredafterstep4,thesourceMMEreleasesthebearer(s)inthesourceServingGWbysendingaDeleteBearerRequestmessage,whichisacknowledgedbytheServingGW. TheUEinitiatesaTrackingAreaUpdateprocedurewhenoneoftheconditionslistedinclause"Triggersfortrackingareaupdate"applies.COPYRIGHT©2011ALCA-LUCENTSHANGHAIBELL.ALL 通信人才网 TheS1-basedhandoverprocedureisusedwhentheX2-basedhandovercannotbeused.ThesourceeNodeBinitiatesahandoverbysendingHandoverRequiredmessageovertheS1-MMEreferencepoint.ThisproceduremayrelocatetheMME;thisproceduremayalsorelocateboththeMMEandtheServingGW.ThesourceMMEselectsthetargetMME.TheMMEshouldnotberelocatedduringinter-eNodeBhandoverunlesstheUEleavestheMMEPoolAreawheretheUEisserved.ThetargetMMEdeterminesiftheServingGWneedstobeThesourceeNodeBdecideswhichoftheEPSbearersaresubjectforforwardingofpacketsfromthesourceeNodeBtothetargeteNodeB.TheEPCdoesnotchangethedecisionstakenbytheRANnode.PacketforwardingcantakeplaceeitherdirectlyfromthesourceeNodeBtothetargeteNodeB,orindirectlyfromthesourceeNodeBtothetargeteNodeBviathesourceandtargetServingGWsTheavailabilityofadirectforwardingpathisdeterminedinthesourceeNodeBandindicatedtothesourceMME.IfX2connectivityisavailablebetweenthesourceandtargeteNodeBs,adirectforwardingpathisavailable.Ifadirectfor