LTE信令流程概要

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 informati

2、onConnection 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

4、令流程概要信令流程概要 (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 procedureAttach procedure for EPS servicesCombined attac

5、h procedure for EPS services and non-EPS services 5.5.2Detach procedureUE initiated detach procedureNetwork initiated detach procedure5.5.3Tracking area updating procedure Normal and periodic tracking area updating procedureCombined tracking area updating procedureConnect

6、ion management (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.

7、4.2Dedicated 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 req

8、uested bearer resource allocation procedure6.5.4UE requested bearer resource modification procedureMiscellaneous procedures ESM information request procedure 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-

9、AP 信令流程概要信令流程概要 Class 1 (Spec 36.413) Elementary ProcedureInitiating MessageSuccessful OutcomeUnsuccessful OutcomeResponse messageResponse messageHandover PreparationHANDOVER REQUIREDHANDOVER COMMANDHANDOVER PREPARATION FAILUREHandover Resource AllocationHANDOVER REQUESTHANDOVER REQUEST ACKNOWLEDGEH

10、ANDOVER FAILUREPath 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 RELE

11、ASE COMMANDE-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

12、Context ModificationUE CONTEXT MODIFICATION REQUESTUE CONTEXT MODIFICATION RESPONSEUE CONTEXT MODIFICATION FAILUREeNB Configuration UpdateENB CONFIGURATION UPDATEENB CONFIGURATION UPDATE ACKNOWLEDGEENB CONFIGURATION UPDATE FAILUREMME Configuration UpdateMME CONFIGURATION UPDATEMME CONFIGURAION UPDAT

13、E ACKNOWLEDGEMME 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 NOTIF

14、YE-RAB Release IndicationE-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 CONT

15、EXT RELEASE REQUESTDownlinkS1 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 TRACE

16、Trace StartTRACE STARTTrace Failure IndicationTRACE FAILURE INDICATIONLocation Reporting ControlLOCATION REPORTING CONTROLLocation Reporting Failure IndicationLOCATION REPORTING FAILURE INDICATIONLocation ReportLOCATION REPORTOverload StartOVERLOAD STARTOverload StopOVERLOAD STOPeNB Direct Informati

17、on TransfereNB DIRECT 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

18、 (Spec 36.331 4.2.1) 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;A

19、cquires system information.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 Sys

20、tem Information Block Type 1 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 ce

21、ll measurements and measurement 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

22、 SRBs are defined:-SRB0 is for RRC messages 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. SRB

23、2 has a lower-priority than SRB1 and is always 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

24、 only for transferring the initial NAS message during 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 conta

25、ining NAS or non-3GPP messages, are integrity protected 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

26、.301 RRC 状态状态 (Spec 36.300) RRC_IDLE:-PLMN selection;-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

27、an E-UTRAN-RRC connection;-UE has context in E-UTRAN;-E-UTRAN 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:-

28、UE can transmit and/or receive data to/from network;- UE monitors 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 c

29、onfigured according to UE activity level for UE power saving and 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 plane

30、No HONo SecurityReady for full connectivity SecurityFully Connected User planeHOSecurityReleaseConn RequestConn FailureSecurity ActivationSecurity FailureReconfigurationConnectionRe-establishmentFailureSuccessful connection re-establishmentRe-establishment FailureEMM main states in the UE (Spec 24.3

31、01 .2.7) EMM main states in the MME (Spec 24.301 .4) EPS Connection Management (ECM)状态状态 (Spec 23.401) ECM-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 3

32、6.304 34 and PLMN selection according to TS 23.122 10.There exists no UE context 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 curre

33、nt TA is not in the list of TAs that the UE has received from the network in order 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 wa

34、s released with release cause load balancing TAU required;-perform a tracking 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 tra

35、cking area update when the UE manually selects a CSG cell, and the CSG ID of that 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

36、radio bearers when uplink user data is to be sent.The UE and the MME shall enter 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 Up

37、date Request, Service Request or Detach Request.When the UE is in ECM IDLE state, the 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 synchronize

38、d between the UE and network.ECM-CONNECTEDThe UE location is known in the MME with 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 and the UEs TIN indicates P-TMSI.For a