IMEISV IMEI and Software Version Number SAE Temporary Mobile Station Identifier 终端 MME产生并维护 携带软件版本号的国际移动台设备标识，用16个数字表示 SAE临时移动标识，由MME分配。与UMTS的P-TMSI格式类似，用于NAS交互中保护用户的IMSI 全球唯一临时标识，在网络中唯一标识UE，可以减少IMSI，IMEI等用户私有参数暴露在网络传输中.第一次attach时UES-TMSI GUTI Globally Unique Temporary Identifier MME产生并维护 携带IMSI，而之后MME会将IMSI和GUTI进行一个对应，以后就一直用GUTI，通过attachaccept带给UE；GUTI由两部分构成，一部分标识分配GUTI的MME，另一部分则标识被分配GUTI的UE(TMSI) UE RRC各状态说明
状态
PLMN选择
NAS配置的DRX过程 系统信息广播和寻呼
RRC_IDLE
邻小区测量 小区重选的移动性
UE获取1个TA区内的唯一标识 eNodeB内无终端上下文 网络侧有UE的上下文信息 网络侧知道UE所处小区 网络和终端可以传输数据 网络控制终端的移动性
RRC_CONNECTED
邻小区测量
存在RRC连接:
UE可以从网络侧收发数据
监听共享信道上指示控制授权的控制信令 UE可以上报信道质量给网络侧 UE可以根据网络配置进行DRX
行为
RRC信令消息简化
业务承载结构
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无线承载（Radio bearer）在UE和eNB之间传送EPS数据包，这是EPS承载和无线承载之间的一一映射
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S1承载(S1 bearer)用来传送eNodeB和Serving GW之间的EPS数据包 eNodeB存储无线承载和S1接口之间的一一映射关系，从而在上行链路和下行链路中绑定无线承载和S1承载接口
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无线承载分类 根据承载内容分类
? 数据承载为DRB，通过eNB为其分配的PDSCH来承载 ? 信令承载通过SRB，LTE中有三类SRB SRB0：承载RRC消息，映射到CCCH信道 SRB0承载的消息 消息名 RRC Connection Reestablishment 消息含义 The RRCConnectionReestablishment message is used to resolve contention and to re-establish SRB1. The RRCConnectionReestablishmentReject message is used to RRC Connection Reestablishment Reject indicate the rejection of an RRC connection reestablishment request. RRC Connection Reestablishment Request The RRCConnectionReestablishmentRequest message is used to request the reestablishment of an RRC connection. The RRCConnectionReject message is used to reject the RRC connection establishment. The RRCConnectionRequest message is used to request the establishment of an RRC connection. The RRCConnectionSetup message is used to establish SRB1. RRC Connection Reject RRC Connection Request RRC Connection Setup
SRB1：承载RRC消息，也可承载NAS消息，映射到DCCH信道
消息名 消息含义 The CounterCheck message is used by the E-UTRAN to indicate the current COUNT MSB values associated to each DRB and to request the UE to compare these to its COUNT MSB values and to report the comparison results to E-UTRAN CounterCheck CounterCheckResponse CSFBParameters RequestCDMA2000 The CounterCheckResponse message is used by the UE to respond to a CounterCheck message. The CSFBParametersRequestCDMA2000 message is used by the UE to obtain the CDMA2000 1xRTT Parameters from the network. The UE needs these parameters to generate the CDMA2000 1xRTT Registration message used to register with the CDMA2000 1xRTT Network which is required to support CSFB to CDMA2000 1xRTT. CSFBParameters ResponseCDMA2000 HandoverFromEUTRA The CSFBParametersResponseCDMA2000 message is used to provide the CDMA2000 1xRTT Parameters to the UE so the UE can register with the CDMA2000 1xRTT Network to support CSFB to CDMA2000 1xRTT. The HandoverFromEUTRAPreparationRequest message is used to trigger the handover preparation procedure with a CDMA2000 RAT. This message is also used to trigger a tunneled preparation procedure with a PreparationRequest (CDMA2000) CDMA2000 1xRTT RAT to obtain traffic channel resources for the enhanced CS fallback to CDMA2000 1xRTT, which may also involve a concurrent preparation for handover to CDMA2000 HRPD. MeasurementReport MobilityFromEUTRA Command The MeasurementReport message is used for the indication of measurement results. The MobilityFromEUTRACommand message is used to command handover or a cell change from E-UTRA to another RAT (3GPP or non-3GPP), or enhanced CS fallback to CDMA2000 1xRTT. The ProximityIndication message is used to indicate that the UE is ProximityIndication entering or leaving the proximity of one or more cells whose CSG IDs are in the UEs CSG whitelist. RRCConnection The RRCConnectionReconfiguration message is the command to modify an RRC connection. It may convey information for measurement configuration, mobility control, radio resource configuration (including Reconfiguration RBs, MAC main configuration and physical channel configuration) including any associated dedicated NAS information and security configuration. RRCConnectionReconfigurationComplete RRCConnection ReestablishmentComplete RRCConnectionRelease RRCConnectionSetup Complete SecurityModeCommand The RRCConnectionReconfigurationComplete message is used to confirm the successful completion of an RRC connection reconfiguration The RRCConnectionReestablishmentComplete message is used to confirm the successful completion of an RRC connection reestablishment. The RRCConnectionRelease message is used to command the release of an RRC connection. The RRCConnectionSetupComplete message is used to confirm the successful completion of an RRC connection establishment. The SecurityModeCommand message is used to command the activation of AS security. The SecurityModeComplete message is used to confirm the successful completion of a security mode command. The SecurityModeFailure message is used to indicate an unsuccessful completion of a security mode command. SecurityModeComplete SecurityModeFailure