LTE信令分析

LTE信令分析一、概述：本文信令内容为2011年6月杭州LTE实验网期间，采用NSN的网络设备，数据卡终端为创毅，测试软件使用CDS吐出的信令内容。由于试验网期间网络、终端、测试软件都没有完全成熟，所以信令内容只局限于现有试验网阶段。以下是终端空闲态、RRC连接态做业务涉及到的所有信令内容。从消息看主要是无线资源控制层RRC消息和非接入层NAS消息。NAS高层消息不再多做描述，主要对RRC层消息做简单介绍。RRC:RRCConnectionRequestRRC:RRCConnectionSetupNAS:AttachRequestNAS:AuthenticationRequestNAS:AuthenticationResponseNAS:SecurityModeCommandNAS:SecurityModeCompleteRRC:UECapabilityEnquiryRRC:UECapabilityInformationNAS:AttachAcceptRRC:RRCConnectReconfigurationCompleteNAS:AttachCompleteRRC:RRCConnectionReleaseRRC:MasterInformationBlockRRC:PagingRRC:MeasurementReport二、信令流程1.切换流程：待补充2.重选信令流程重选过程是RRC空闲状态下的流程，只有2条信令：RRC:RRCConnectionRequest、RRC:MasterInformationBlock。如下图所示：3.FTP信令流程：待补充三、详细信令1.RRC层信令内容业务和功能广播和NAS相关的系统消息广播和AS相关的系统消息寻呼建立、维护和释放终端和E-UTRAN之间的RRC链接包括分配临时的终端标识，配置信令承载安全功能包括密钥的管理建立、维护和释放点对点的无线承载移动性管理功能，包括测量控制和上报、切换、小区选择和重选、切换时RRC上下文传递广播MBMS业务建立、维护和释放MBMS无线承载QoS管理功能终端测量控制和上报上下行透明传递NAS消息1)RRC:RRCConnectionRequestMessagetype:CCCH_ULDirection:UplinkComputerTimestamp:14:57:41.890uL-CCCH-Messagemessagec1rrcConnectionRequestcriticalExtensionsrrcConnectionRequest-r8ue-IdentityrandomValue:1101110111011101110111011101110111011101establishmentCause:mo-Signallingspare:05DDDDDDDDDD6主要内容：终端身份、建立原因。2)RRC:RRCConnectionSetupMessagetype:CCCH_DLDirection:DownlinkComputerTimestamp:14:57:41.937dL-CCCH-Messagemessagec1rrcConnectionSetuprrc-TransactionIdentifier:2criticalExtensionsc1rrcConnectionSetup-r8radioResourceConfigDedicatedsrb-ToAddModListSRB-ToAddModsrb-Identity:1rlc-ConfigexplicitValueamul-AM-RLCt-PollRetransmit:ms100pollPDU:pInfinitypollByte:kBinfinitymaxRetxThreshold:t16dl-AM-RLCt-Reordering:ms50t-StatusProhibit:ms0logicalChannelConfig:defaultValuemac-MainConfigRLC控制参数：t-PollRetransmit、pollPDU、pollByte、maxRetxThreshold。explicitValueul-SCH-ConfigmaxHARQ-Tx:n4periodicBSR-Timer:infinityretxBSR-Timer:sf2560ttiBundling:falsetimeAlignmentTimerDedicated:sf10240physicalConfigDedicatedpdsch-ConfigDedicatedp-a:dB0pusch-ConfigDedicatedbetaOffset-ACK-Index:10betaOffset-RI-Index:3betaOffset-CQI-Index:8uplinkPowerControlDedicatedp0-UE-PUSCH:2deltaMCS-Enabled:en0accumulationEnabled:truep0-UE-PUCCH:2pSRS-Offset:7filterCoefficient:fc4cqi-ReportConfigcqi-ReportModeAperiodic:rm30nomPDSCH-RS-EPRE-Offset:0cqi-ReportPeriodicsetupcqi-PUCCH-ResourceIndex:4cqi-pmi-ConfigIndex:8cqi-FormatIndicatorPeriodic:widebandCQIsimultaneousAckNackAndCQI:falsesoundingRS-UL-ConfigDedicatedsetupsrs-Bandwidth:bw0srs-HoppingBandwidth:hbw0freqDomainPosition:0duration:truesrs-ConfigIndex:21transmissionComb:1cyclicShift:cs4antennaInfoexplicitValuetransmissionMode:tm2ue-TransmitAntennaSelection:releaseschedulingRequestConfigMAC层控制参数：HARQ重传、BSR重发定时器等。物理层控制参数：PDSCH;PUSCH:ACK\RI\CQI；上行功控；CQI控制参数；SRS参数；天线信息：transmissionMode；。。。。。setupsr-PUCCH-ResourceIndex:32sr-ConfigIndex:13dsr-TransMax:n6470129813FD940499F3659F28E14D3ECC0100820082B8141006C0主要内容：RLC层、MAC层、PHY层各种参数配置。3)RRC:UECapabilityEnquiryMessagetype:DCCH_DLDirection:DownlinkComputerTimestamp:14:57:42.296dL-DCCH-Messagemessagec1ueCapabilityEnquiryrrc-TransactionIdentifier:2criticalExtensionsc1ueCapabilityEnquiry-r8ue-CapabilityRequest:eutra主要内容：UE能力询问4)RRC:UECapabilityInformationMessagetype:DCCH_ULDirection:UplinkComputerTimestamp:14:57:42.296uL-DCCH-Messagemessagec1ueCapabilityInformationrrc-TransactionIdentifier:2criticalExtensionsc1ueCapabilityInformation-r8ue-CapabilityRAT-ContainerListUE-CapabilityRAT-Containerrat-Type:eutraueCapabilityRAT-Container:81000019d2810381d183442000003C0100E81000019D2810381D183442000000主要内容：UE能力5)RRC:RRCConnectionReconfigurationMessagetype:DCCH_DLDirection:DownlinkComputerTimestamp:15:20:36.000dL-DCCH-Messagemessagec1rrcConnectionReconfigurationrrc-TransactionIdentifier:1criticalExtensionsc1rrcConnectionReconfiguration-r8measConfigmeasObjectToAddModListMeasObjectToAddModmeasObjectId:1measObjectmeasObjectEUTRAcarrierFreq:38050allowedMeasBandwidth:mbw100presenceAntennaPort1:trueneighCellConfig:00offsetFreq:dB0reportConfigToAddModListReportConfigToAddModreportConfigId:1reportConfigreportConfigEUTRAtriggerTypeeventeventId下发UE需测量的信息：频点、频点带宽。。。。eventA3a3-Offset:4reportOnLeave:falsehysteresis:0timeToTrigger:ms320triggerQuantity:rsrpreportQuantity:sameAsTriggerQuantitymaxReportCells:8reportInterval:ms1024reportAmount:infinityReportConfigToAddModreportConfigId:2reportConfigreportConfigEUTRAtriggerTypeeventeventIdeventA5a5-Threshold1threshold-RSRP:60a5-Threshold2threshold-RSRP:62hysteresis:0timeToTrigger:ms480triggerQuantity:rsrpreportQuantity:sameAsTriggerQuantitymaxReportCells:8reportInterval:ms240reportAmount:infinityReportConfigToAddModreportConfigId:3reportConfigreportConfigEUTRAtriggerTypeeventeventIdeventA2a2-Threshold下发UE需要上报的控制参数：A3\A2\A5事件参数，threshold-RSRP:1hysteresis:0timeToTrigger:ms256triggerQuantity:rsrpreportQuantity:sameAsTriggerQuantitymaxReportCells:8reportInterval:min60reportAmount:r1measIdToAddModListMeasIdToAddModmeasId:1measObjectId:1reportConfigId:1MeasIdToAddModmeasId:2measObjectId:1reportConfigId:2MeasIdToAddModmeasId:4measObjectId:1reportConfigId:3quantityConfigquanti