LTE基本概念及信令流程分析讲述.ppt

TAC与TA-LIST之间进行TAU判断； ECM是指EPS连接性管理（EPS Connectivity Management，ECM） 第六条消息是通过原基站发送目标基站的重配置要求； 协议结构中逻辑信道和传输信道位置 LTE信道简化，主要需要处理共享信道。C-RNTI：加扰 切换：系统预留非竞争preamble码； ETWS：地震、台风等紧急消息 DRX？ RRC？ 理解：连接态测量具有针对性！！ RRC：打通无线侧UE与eNB的联接； Attach：打通UE与核心网的联接； RRC-IDLE状态可以接收寻呼消息； 附录：SRB1承载的消息（1） 消息名 消息含义 CounterCheck 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 CounterCheckResponse The CounterCheckResponse message is used by the UE to respond to a CounterCheck message. CSFBParameters RequestCDMA2000 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 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. HandoverFromEUTRA PreparationRequest (CDMA2000) 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 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 The MeasurementReport message is used for the indication of measurement results. MobilityFromEUTRA Command 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. ProximityIndication The ProximityIndication message is used to indic