LTE入网流程分析[1]

文档名称文档密级2014-8-13华为机密，未经许可不得扩散第1页,共18页目录LTE入网流程分析............................................................................................错误！未定义书签。RevisionRecord修订记录............................................................................错误！未定义书签。1入网流程...................................................................................................................................21.1UE初始化..........................................................................................................................31.2PLMN选择.........................................................................................................................41.3扫频...................................................................................................................................41.4小区搜索...........................................................................................................................71.5解系统消息（SystemInformation）..................................................................................81.6小区选择.........................................................................................................................101.7小区驻留（CampedontheCell）：................................................................................101.8Attachrequest...................................................................................................................101.9RRCCONNECTIONRequest............................................................................................111.10随机接入.........................................................................................................................111.11RRC连接建立..................................................................................................................121.12Attachaccept/Attachcomplete.......................................................................................122搜网相关AT命令....................................................................................................................132.1AT+COPS命令.................................................................................................................132.2扩展系统配置参考设置命令AT^syscfgex命令...............................................................133UELTE网络入网log抓取与查看............................................................................................143.1LTE入网log抓取..............................................................................................................143.2UE入网log查看................................................................................................................154LTE的锁频方法......................................................................................................................165QCN的备份与导入.................................................................................................................176参考资料.................................................................................................................................18文档名称文档密级2014-8-13华为机密，未经许可不得扩散第2页,共18页1入网流程LTE入网是指UE开机上电后搜网，并注册到网络的过程。入网基本流程图如下图所示：开机上电初始化PLMN选择3GPPTS23.122SIM卡识别3GPPTS31.102搜网相关NV项扫频LTEWCDMASystemScanBandScan1)SystemScanFail2)获取UE支持Band3)从每个Band中选出最多50个候选(candidate)频点4)对每个候选频点进行Acq1)读取AcqDB中的频点nv\reg_files\modem\lte\rrc\csp\acq_db2)对每个acq_db中的频点进行Acq1)AcqDBNV007222)RawScan//粗扫3)FineScan//细扫自动搜网3GPPTS23.1224.4.3.1.1手动搜网3GPPTS23.1224.4.3.1.2小区搜索3GPPTS36.2134.1CellsearchLTEWCDMA1)时隙同步P-SCH匹配滤波器2)帧同步（S-SCH）和主扰码识别3)主扰码识别，解读小区广播消息1)PSS2)SSS解系统消息3GPPTS36.3315.2Systeminformation3GPPTS36.3316Protocoldataunits,formatsandparametersMIB:CellID/FREQ/SFN/Antennas/DLBWSIB1:PLMNID/TAC/CellID等CellAccess、Selection、Schedule相关信息SI:SIB2~SIB13SIB2:radioresourceconfigurationinformation……小区选择3GPPTS36.3045.2Cellselectionandreselection5.2.4.65.2.3.2CellSelectionCriterionS准则小区驻留(Camped)3GPPTS36.304AttachRequest3GPPTS24.3018.2.4AttachrequestRRCCONNECTIONrequest3GPPTS36.3315.3Connectioncontrol随机接入3GPPTS36.30010.1.5RandomAccessProcedure1)MSG1:RandomAccessPreamble2)MSG2:RandomAccessResponse3)MSG3:ScheduledTransmission4)MSG4:ContentionResolutionRRCCONNECTIONsetupRRCCONNECTIONsetupcompleteAttachaccept3GPPTS24.3018.2.1AttachacceptAttachComplete3GPPTS24.3018.2.2Attachcomplete图1.1入网基本流程图文档名称文档密级2014-8-13华为机密，未经许可不得扩散第3页,共18页LTE入网的详细流程分析如下：1.1UE初始化UE的初始化主要包含SIM卡识别和搜网相关NV项读取两部分内容。SIM相关信息主要包括以下几项（参考协议3GPPTS31.102）：1)EFHPLMNwAcT：HPLMNselectorwithAccessTechnology，文件类型定义如图1.2；图1.2EFHPLMNwAcT文件格式2)EFOPLMNwACT：OperatorcontrolledPLMNselectorwithAccessTechnology3)EFPLMNwAcT：UsercontrolledPLMNselectorwithAccessTechnology4)EFFPLMN：ForbiddenPLMNs5)EFEHPLMN：EquivalentHPLMN搜网相关NV项，主要有以下几项：1）NV00010：Digital/AnalogModePreference，接入技术，通常采用Auto/2G/3G/4G四个选项；2）NV00849：NetworkSelectionModePreference，搜网模式，存在Auto和Manual两个选项；3）NV00850：ServiceDomainPreference，服务域选取，可以是仅PS、仅CS或者PS+CS；4）NV00722：AcquisitionDatabase，用来存放WCDMA的历史频点信息；5）LTE的频段信息存放在nv/item_files/modem/mmode/lte_bandpref文件中，参考图1.2；关于lte_bandpref文件内容说明参考图1.3，其为E589u-12的lte_bandpref文件，说明E589u-12支持Band1，Band3，Band7，Band8和