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用户附着网络信令流程图 初始上下文建立（默认承载）安全激活（ AS）ue能力查询（ Optional ）NAS安全模式 (NAS)鉴权(NAS：optional)Rrc连接建立（ srb1）UERRCConnectionRequestRRCConnectionSetupComplete ( attach request( PDN connectivity request) )SeccurityModeCompleteRRCConnectionSetupSecurityCommandRRCConnectionReconfiguration( attach accep t(activate default EPS bearer context request))Initial UE message( attach reques t(PDN connectivity request ))Initial Context setup request ( attach accept (activate default EPS bearer context request))RRCConnectionReconfigurationCompleteInitail context setup reponseUL Information Transfer( attach complete (activate default EPS bearer context accept))Uplink Nas transport ( attach complete (activate default EPS bearer context accept))eNBMMEDownlink NAS transport( authentication request )DL information transfer( authentication request)UL information transfer ( authentication response)Uplink NAS transport( authentication response)UE capability info indicationUECapabilityEnquiryUECapabilityInformationDownlink NAS transport( Security mode command )DL information transfer ( Security mode command)UL information transfer ( Security mode completeUplink NAS transport( Security mode complete )开机->srb0 建立PLMN 搜索小区搜索读广播小区驻留建立rb0身份认证 (NAS：optional)Downlink NAS transport( identificaition Request )DL information transfer( identificaition Reques t)UL information transfer ( identificaition response)Uplink NAS transport( identificaition response )小区建立Rb0建立专用承载建立（ rdb4）RRCConnectionReconfiguration( activateDedicatedEpsBearerContextRequest)E-RABSetupRequest ( activateDedicatedEpsBearerContextRequest)RRCConnectionReconfigurationCompleteInitail context setup reponseUL Information Transfer( Activate dedicated EPS bearer context accept)Uplink Nas transport ( Activate dedi...