1、LTE层3信令流程概要信令流程概要和States MachineE-UTRAN 控制面协议栈RRCPDCPRLCMACPHYRRCPDCPRLCMACPHYS1APX2APSCTPL2L1IPS1APX2APSCTPL2L1IPNASNASUEeNodeB MME/eNodeB24.30136.33136.32336.32236.32136.21136.21436.41336.42336.41236.422S1-MME/X2-CLTE-UuGTP-CUDPL2L1IPPDN/S-GW29.274RRC 信令流程概要信令流程概要(Spec 36.331)5.2System information
2、Connection control5.3.2Paging5.3.3RRC connection establishment5.3.4Initial security activation5.3.5RRC connection reconfiguration5.3.6Counter check5.3.7RRC connection re-establishment5.3.8RRC connection release5.3.9RRC connection release requested by upper layers5.3.10Radio resource configuration5.3
3、.11Radio link failure related actions5.3.12UE actions upon leaving RRC_CONNECTED5.3.13UE actions upon PUCCH/SRS release request5.4Inter-RAT mobility5.5MeasurementsOther5.6.1DL information transfer5.6.2UL information transfer5.6.3UE capability transfer5.6.4CSFB to 1x Parameter transferNAS EPS MM 信令流程
4、概要信令流程概要(Spec 24.301)Common procedures5.4.1GUTI reallocation procedure5.4.2Authentication procedure5.4.3Security mode control procedure5.4.4Identification procedure5.4.5EMM information procedureSpecific procedures5.5.1Attach procedure5.5.1.2Attach procedure for EPS services5.5.1.3Combined attach pro
5、cedure for EPS services and non-EPS services 5.5.2Detach procedure5.5.2.2UE initiated detach procedure5.5.2.3Network initiated detach procedure5.5.3Tracking area updating procedure 5.5.3.2Normal and periodic tracking area updating procedure5.5.3.3Combined tracking area updating procedureConnection m
6、anagement(ECM)procedures 5.6.1Service request procedure5.6.2Paging procedure5.6.3Transport of NAS messages procedure5.6.4Generic transport of NAS messages procedureNetwork initiated ESM procedures(Procedures related to EPS bearer contexts)6.4.1Default EPS bearer context activation procedure6.4.2Dedi
7、cated EPS bearer context activation procedure6.4.3EPS bearer context modification procedure6.4.4EPS bearer context deactivation procedureUE requested ESM procedures(Transaction related procedures)6.5.1UE requested PDN connectivity procedure6.5.2UE requested PDN disconnect procedure6.5.3UE requested
8、bearer resource allocation procedure6.5.4UE requested bearer resource modification procedureMiscellaneous procedures6.6.1.2 ESM information request procedure6.6.1.3 Exchange of protocol configuration options in other messages6.6.2Notification procedureNAS EPS SM 信令流程概要信令流程概要(Spec 24.301)S1-AP 信令流程概要
9、信令流程概要 Class 1(Spec 36.413)Elementary ProcedureInitiating MessageSuccessful OutcomeUnsuccessful OutcomeResponse messageResponse messageHandover PreparationHANDOVER REQUIREDHANDOVER COMMANDHANDOVER PREPARATION FAILUREHandover Resource AllocationHANDOVER REQUESTHANDOVER REQUEST ACKNOWLEDGEHANDOVER FAI
10、LUREPath Switch RequestPATH SWITCH REQUESTPATH SWITCH REQUEST ACKNOWLEDGEPATH SWITCH REQUEST FAILUREHandover CancellationHANDOVER CANCELHANDOVER CANCEL ACKNOWLEDGEE-RAB SetupE-RAB SETUP REQUESTE-RAB SETUP RESPONSEE-RAB ModifyE-RAB MODIFY REQUESTE-RAB MODIFY RESPONSEE-RAB ReleaseE-RAB RELEASE COMMAND
11、E-RAB RELEASE RESPONSEInitial Context SetupINITIAL CONTEXT SETUP REQUESTINITIAL CONTEXT SETUP RESPONSEINITIAL CONTEXT SETUP FAILUREResetRESETRESET ACKNOWLEDGES1 SetupS1 SETUP REQUESTS1 SETUP RESPONSES1 SETUP FAILUREUE Context ReleaseUE CONTEXT RELEASE COMMANDUE CONTEXT RELEASE COMPLETEUE Context Mod
12、ificationUE CONTEXT MODIFICATION REQUESTUE CONTEXT MODIFICATION RESPONSEUE CONTEXT MODIFICATION FAILUREeNB Configuration UpdateENB CONFIGURATION UPDATEENB CONFIGURATION UPDATE ACKNOWLEDGEENB CONFIGURATION UPDATE FAILUREMME Configuration UpdateMME CONFIGURATION UPDATEMME CONFIGURAION UPDATE ACKNOWLED
13、GEMME CONFIGURATION UPDATE FAILUREWrite-Replace Warning WRITE-REPLACE WARNING REQUESTWRITE-REPLACE WARNING RESPONSEClass 1:Elementary Procedures with response(success and/or failure).S1-AP 信令流程概要信令流程概要 Class 2(Spec 36.413)Elementary ProcedureMessageHandover NotificationHANDOVER NOTIFYE-RAB Release I
14、ndicationE-RAB RELEASE INDICATIONPagingPAGINGInitial UE MessageINITIAL UE MESSAGEDownlink NAS TransportDOWNLINK NAS TRANSPORTUplink NAS TransportUPLINK NAS TRANSPORTNAS non delivery indicationNAS NON DELIVERY INDICATIONError IndicationERROR INDICATIONUE Context Release RequestUE CONTEXT RELEASE REQU
15、ESTDownlinkS1 CDMA2000 TunnelingDOWNLINK S1 CDMA2000 TUNNELINGUplink S1 CDMA2000 TunnelingUPLINK S1 CDMA2000 TUNNELINGUE Capability Info IndicationUE CAPABILITY INFO INDICATIONeNB Status TransfereNB STATUS TRANSFERMME Status TransferMME STATUS TRANSFERDeactivate TraceDEACTIVATE TRACETrace StartTRACE
16、 STARTTrace Failure IndicationTRACE FAILURE INDICATIONLocation Reporting ControlLOCATION REPORTING CONTROLLocation Reporting Failure IndicationLOCATION REPORTING FAILURE INDICATIONLocation ReportLOCATION REPORTOverload StartOVERLOAD STARTOverload StopOVERLOAD STOPeNB Direct Information TransfereNB D
17、IRECT INFORMATION TRANSFERMME Direct Information TransferMME DIRECT INFORMATION TRANSFEReNB Configuration TransfereNB CONFIGURATION TRANSFERMME Configuration TransferMME CONFIGURATION TRANSFERCell Traffic TraceCELL TRAFFIC TRACEClass 2:Elementary Procedures without response RRC 状态状态(Spec 36.331 4.2.
18、1)RRC_IDLE:A UE specific DRX may be configured by upper layers.UE controlled mobility;The UE:Monitors a Paging channel to detect incoming calls,system information change,and for ETWS capable UEs,ETWS notification;Performs neighbouring cell measurements and cell(re-)selection;Acquires system informat
19、ion.RRC_CONNECTED:Transfer of unicast data to/from UE.At lower layers,the UE may be configured with a UE specific DRX.Network controlled mobility,i.e.handover and cell change order with optional network assistance(NACC)to GERAN;The UE:Monitors a Paging channel and/or System Information Block Type 1
20、contents to detect system information change,and for ETWS capable UEs,ETWS notification;Monitors control channels associated with the shared data channel to determine if data is scheduled for it;Provides channel quality and feedback information;Performs neighbouring cell measurements and measurement
21、 reporting;Acquires system information.RRC SRB 定义定义(Spec 36.331 4.2.2)4.2.2Signalling radio bearersSignalling Radio Bearers(SRBs)are defined as Radio Bearers(RB)that are used only for the transmission of RRC and NAS messages.More specifically,the following three SRBs are defined:-SRB0 is for RRC mes
22、sages using the CCCH logical channel;-SRB1 is for RRC messages(which may include a piggybacked NAS message)as well as for NAS messages prior to the establishment of SRB2,all using DCCH logical channel;-SRB2 is for NAS messages,using DCCH logical channel.SRB2 has a lower-priority than SRB1 and is alw
23、ays configured by E-UTRAN after security activation.In downlink piggybacking of NAS messages is used only for one dependant(i.e.with joint success/failure)procedure:bearer establishment/modification/release.In uplink NAS message piggybacking is used only for transferring the initial NAS message duri
24、ng connection setup.NOTE:The NAS messages transferred via SRB2 are also contained in RRC messages,which however do not include any RRC protocol control information.Once security is activated,all RRC messages on SRB1 and SRB2,including those containing NAS or non-3GPP messages,are integrity protected
25、 and ciphered by PDCP.NAS independently applies integrity protection and ciphering to the NAS messages.Initial NAS messages are:-ATTACH REQUEST;-DETACH REQUEST;-TRACKING AREA UPDATE REQUEST;-SERVICE REQUEST;and EXTENDED SERVICE REQUEST.Spec 24.301 5.3.1.1RRC 状态状态(Spec 36.300)RRC_IDLE:-PLMN selection
26、;-DRX configured by NAS;-Broadcast of system information;-Paging;-Cell re-selection mobility;-The UE shall have been allocated an id which uniquely identifies the UE in a tracking area;-No RRC context stored in the eNB RRC_CONNECTED:-UE has an E-UTRAN-RRC connection;-UE has context in E-UTRAN;-E-UTR
27、AN knows the cell which the UE belongs to;-Network can transmit and/or receive data to/from UE;-Network controlled mobility(handover and inter-RAT cell change order to GERAN with NACC);-Neighbour cell measurements;-At PDCP/RLC/MAC level:-UE can transmit and/or receive data to/from network;-UE monito
28、rs control signalling channel for shared data channel to see if any transmission over the shared data channel has been allocated to the UE;-UE also reports channel quality information and feedback information to eNB;-DRX period can be configured according to UE activity level for UE power saving and
29、 efficient resource utilization.This is under control of the eNB.RRC Connection(Sub-)States for UEInitial statePower On System AcquisitionIdle StateCell(re-)selectionMeasurementsPagingConnected stateLimited connectivity No user planeNo HONo SecurityReady for full connectivity SecurityFully Connected
30、 User planeHOSecurityReleaseConn RequestConn FailureSecurity ActivationSecurity FailureReconfigurationConnectionRe-establishmentFailureSuccessful connection re-establishmentRe-establishment FailureEMM main states in the UE(Spec 24.301 5.1.3.2.2.7)EMM main states in the MME(Spec 24.301 5.1.3.4.4)EPS
31、Connection Management(ECM)状态状态(Spec 23.401)4.6.3.1ECM-IDLEA UE is in ECM-IDLE state when no NAS signalling connection between UE and network exists.In ECM-IDLE state,a UE performs cell selection/reselection according to TS 36.304 34 and PLMN selection according to TS 23.122 10.There exists no UE con
32、text in E-UTRAN for the UE in the ECM-IDLE state.There is no S1_MME and no S1_U connection for the UE in the ECM-IDLE state.In the EMM-REGISTERED and ECM-IDLE state,the UE shall:-perform a tracking area update if the current TA is not in the list of TAs that the UE has received from the network in o
33、rder to maintain the registration and enable the MME to page the UE;-perform the periodic tracking area updating procedure to notify the EPC that the UE is available;-perform a tracking area update if the RRC connection was released with release cause load balancing TAU required;-perform a tracking
34、area update when the UE reselects an E-UTRAN cell and the UEs TIN indicates P-TMSI;-perform a tracking area update for a change of the UEs Core Network Capability information or the UE specific DRX parameter;-perform a tracking area update when the UE manually selects a CSG cell,and the CSG ID of th
35、at cell is absent from both the UEs Allowed CSG list and the UEs Operator CSG list;-answer to paging from the MME by performing a service request procedure;-perform the service request procedure in order to establish the radio bearers when uplink user data is to be sent.The UE and the MME shall ente
36、r the ECM-CONNECTED state when the signalling connection is established between the UE and the MME.Initial NAS messages that initiate a transition from ECM-IDLE to ECM-CONNECTED state are Attach Request,Tracking Area Update Request,Service Request or Detach Request.When the UE is in ECM IDLE state,t
37、he UE and the network may be unsynchronized,i.e.the UE and the network may have different sets of established EPS bearers.When the UE and the MME enter the ECM CONNECTED state,the set of EPS Bearers is synchronized between the UE and network.4.6.3.2ECM-CONNECTEDThe UE location is known in the MME wi
38、th an accuracy of a serving eNodeB ID.The mobility of UE is handled by the handover procedure.The UE performs the tracking area update procedure when the TAI in the EMM system information is not in the list of TAs that the UE registered with the network,or when the UE handovers to an E UTRAN cell an
39、d the UEs TIN indicates P-TMSI.For a UE in the ECM-CONNECTED state,there exists a signalling connection between the UE and the MME.The signalling connection is made up of two parts:an RRC connection and an S1_MME connection.The UE shall enter the ECM-IDLE state when its signalling connection to the
40、MME has been released or broken.This release or failure is explicitly indicated by the eNodeB to the UE or detected by the UE.The S1 release procedure changes the state at both UE and MME from ECM-CONNECTED to ECM-IDLE.NOTE 1:The UE may not receive the indication for the S1 release,e.g.due to radio
41、link error or out of coverage.In this case,there can be temporal mismatch between the ECM-state in the UE and the ECM-state in the MME.After a signalling procedure,the MME may decide to release the signalling connection to the UE,after which the state at both the UE and the MME is changed to ECM-IDL
42、E.NOTE 2:There are some abnormal cases where the UE transitions to ECM-IDLE.When a UE changes to ECM CONNECTED state and if a radio bearer cannot be established,or the UE cannot maintain a bearer in the ECM-CONNECTED state during handovers,the corresponding EPS bearer is deactivated.EPS Connection Management(ECM)状态状态(Spec 23.401 4.6.4)RRC ECM EMM状态关系状态关系EPS Session Management(ESM)状态状态(Spec 24.301)
