02 WCDMA UTRAN Interface and Signaling Procedure
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Transcript of 02 WCDMA UTRAN Interface and Signaling Procedure
WCDMA UTRAN Interface and Signaling Procedure
www.huawei.com
Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
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Objectivesl
Upon completion of this course, you will be able to:p
Understand UTRAN interface and structure Understand the definitions about UTRAN network elements Understand UTRAN signaling procedure
p
p
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Page1
Contents1. UTRAN Network Overview 2. Basic Concepts about UTRAN 3. UTRAN Signaling Procedure
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Page2
Contents1. UTRAN Network Overview 2. Basic Concepts about UTRAN 3. UTRAN Signaling Procedure
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Page3
UMTS StructureCore Network Iu RNS Iur RNC Iub NodeB Iub NodeB Iub NodeB RNC Iub NodeB RNS Iu
UTRAN User EquipmentCopyright 2006 Huawei Technologies Co., Ltd. All rights reserved. PDF created with pdfFactory Pro trial version www.pdffactory.com Page4
Uu InterfaceGC Nt DC Duplication avoidance GC C-plane signaling Nt DC U-plane information control UuS boundary
RRC control control control control
L3 Radio Bearers PDCP PDCP BMC L2/PDCP L2/BMC
RLC
RLC
RLC
RLC RLC RLC
RLC RLC
L2/RLC
Logical Channels MAC L2/MAC Transport Channels L1
PHY
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Page5
General Protocol Mode for UTRAN Terrestrial Interfacel
The structure is based on the principle that the layers and planes are logically independent of each other.Radio Network Layer Control Plane Application ProtocolTransport Network User Plane Transport Network Control Plane
User Plane Data Stream(s)
Transport Network Layer
Transport Network User Plane
ALCAP(s) Signalling Bearer(s) Signalling Bearer(s)Physical Layer
Data Bearer(s)
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Page6
RNL Control Plane Application ProtocolCNRANAP RRC RNSAP
UE
RNCNBAP
RNC
NodeBNBAP RANAP RNSAP RRC Node B Application Part Radio Access Network Application Part Radio Network Subsystem Application Part Radio Resource ControlPage8
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Iu-CS InterfaceRadio Network LayerControl Plane RANAP User plane Iu UP
Transport Network User Plane
Transport Network Control Plane
Transport Network User Plane
Transport Network Layer
ALCAP ALCAPSCCP A MTP3-B SAAL NNI B MTP3-B SAAL NNI AAL2 PATH
ATM Physical Layer
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Page9
Iu-PS InterfaceRadio Network LayerControl Plane RANAP User plane Iu UP
Transport Network Layer
Transport Network User Plane SCCP MTP3-B
Transport Network User Plane GTP-U C UDP IP AAL Type 5
SAAL NNI
ATM Physical Layer
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Page10
Iub InterfaceRadio Network Layer Control Plane NBAP NCP CCP Transport Network Control Plane Transport Network Layer Transport Network User Plane ALCAP ALCAP Transport Network User Plane User plane Iub FP
SAAL UNI
SAAL UNI
AAL2 PATH
ATM Physical Layer
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Page11
Iur InterfaceRadio Network LayerControl Plane RANAP User plane Iur Data Stream Transport Network Control Plane
Transport Network User Plane
Transport Network User Plane
Transport Network Layer
ALCAP ALCAPSCCP A MTP3-B SAAL NNI B MTP3-B SAAL NNI AAL2 PATH
ATM Physical Layer
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Page12
Contents1. UTRAN Network Overview 2. Basic Concepts about UTRAN 3. UTRAN Signaling Procedure
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Page13
SRNC / DRNCCNIu Iur
SRNC
DRNC
l l
SRNC and DRNC are concepts for a connected UE. The SRNC handles the connection to one UE, and may borrow radio resources of a certain cell from the DRNC. Drift RNCs support the Serving RNC by providing radio resources A UE in connection state has at least one and only one SRNC, but can has 0 or multiple DRNCsPage14
l l
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CRNCCNIu
CRNC
Iub
NodeB
... ...Cell
NodeBCell Cell
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The CRNC owns the radio resources of a cell
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Page15
RAB, RB and RL
RAB RB UE RL NodeB
RNC
CN
UTRAN
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Page16
UE Working Modes and Statesl l
Idle Mode Connected Modep
Cell_DCH Cell_FACH Cell_PCH URA_PCH
p
p
p
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Page17
Idle Model
The UE has no relation to UTRAN, only to CN. For data transfer, a signalling connection has to be established. UE camps on a cellp
l
It enables the UE to receive system information from the PLMN UE can receive paging message from the PICH of a cell It enables the UE to receive cell broadcast services.
p
p
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The idle mode tasks can be divided into three processes:p
PLMN selection and reselection Cell selection and reselection Location registration
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p
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Page18
Connected Model
When UE is in connected mode, there is normally an RRC connection between UE and UTRAN.
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The UE position can be known on different levels:p
Cell level UTRAN Registration Area (URA) level Dedicated transport channels (DCH) Common transport channels (RACH / FACH, DSCH)
p
p
p
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Page19
Connected Model
Cell-DCHp
In active state Communicating via its dedicated channels UTRAN knows which cell UE stays in
p
p
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Page21
Connected Model
Cell-FACHp
In active state Few data to be transmitted both in uplink and in downlink. There is no need to allocate dedicated channel for this UE
p
p
Downlink uses FACH and uplink uses RACH UE needs to monitor the FACH for its information UTRAN knows which cell the UE stays in
p
p
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Page22
Connected Model
Cell-PCHp
No data to be transmitted or received Monitor PICH, to receive its paging UTRAN knows which cell the UE stays in UTRAN has to update cell information of UE when UE roams to another cell
p
p
p
p
Lower the power consumption of UE
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Page23
Connected Model
URA-PCHp
No data to be transmitted or received Monitor PICH, to receive its paging UTRAN only knows which URA (which consists of multiple cells) that UE stays UTRAN updates UE information only after UE has roamed to other URA A better way to reduce the resource occupancy and signaling transmission
p
p
p
p
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Page24
UE Working Modes and States- Reduce activity further - Avoid unnecessary signaling
RRC Connection
- Reduce activity, DTX, and save power
URA_PCH
CELL_PCH
CELL_DCH- Dedicated channel - Common service, such as voice
CELL_FACH- Common channel - PS service with few data to transmit
IDLE
- Monitor paging channel - Cell re-selection
DEAD
- Scan networks (PLMN) - Camp on a cell
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Page25
Contents1. UTRAN Network Overview 2. Basic Concepts about UTRAN 3. UTRAN Signaling Procedure
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Page26
Contents3. UTRAN Signaling Procedure3.1 System Information Broadcast 3.2 Paging 3.3 Call Process 3.4 Handover
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Page27
System Information Broadcast FlowUE Node BNBAP 1. System Information Update Request NBAP 2. System Information Update Response
RNC
NBAP
NBAP
RRC
3. BCCH: System Information
RRC
RRC
4. BCCH: System Information
RRC
RRC
5. BCCH: System Information
RRC
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Page28
Introduction of System Informationl
MIB:p
PLMN tag Scheduling information for SB (Scheduling Block) Scheduling information for SIB (System Information Block)
p
p
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SB1: scheduling information for SIB SB2: scheduling information for SIB (extended)
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Page29
Introduction of System Informationl l l l
SIB1: System information for NAS and the timer/counter for UE SIB2: URA information SIB3: Parameters for cell selection and cell re-selection SIB4: Parameters for cell selection and cell re-selection while UE is in connected mode SIB5: Parameters for the common physical channels of the cell SIB6: Parameters for the common physical channels of the cell while UE is in connected mode
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Introduction of System Informationl l l l
SIB7: uplink interference level and the refreshing timer SIB8: the CPCH static information SIB9: the CPCH dynamic information SIB10: information to be used by UEs having their DCH controlled by a DRAC procedure SIB11: measurement controlling information SIB12: measurement controlling information in connected mode
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Introduction of System Informationl l l l
SIB13: ANSI-41 system information SIB14: the information in TDD mode SIB15: the position service information SIB16: the needed pre-configuration information for handover from other RAT to UTRAN SIB17: the configuration information for TDD SIB18: the PLMN identities of the neighboring cells to be used in shared networks to help with the cell reselection process
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System Information Block Type 1l
System information type 1p
The NAS system information CS domain DRX: K=6, then DRX period is 2^k= 2^6= 64TTI=640 ms PS domain DRX: K=6, then DRX period is 2^k=2^6=64TTI =640 ms
p
p
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Page33
System Information Block Type 2l
System info type 2p
URA information
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System Information Block Type 3l
The references for cell selection and re-selectionp
Qhyst2s Sintrasearch Sintersearch Sinterratsearch Qqualmin Qrxlemin T reselection Max Allowed UE TX power
p
p
p
p
p
p
p
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Page35
System Information Block Type 5l
The configuration information for the following physical channels and the counterpart transport channelsp
PCCPCH SCCPCH PICH AICH PRACH
p
p
p
p
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Page36
System Information Block Type 7 and 11l
System info type 7p
Including the UL interference level which is used for open loop power control Including the Expiration Time Factor which is used for refreshing the SIB7 periodically
p
l
System info type 11p
The neighbor cell information for cell re-selection in IDLE mode
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Page37
Contents3. UTRAN Signaling Procedure3.1 System Information Broadcast 3.2 Paging 3.3 Call Process 3.4 Handover
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Page38
Paging Typesl
The paging information type which is sent by UTRAN is decided by UE mode.p
If UE is in the Idle mode, CELL_PCH or URA_PCH states, UTRAN sends paging type 1, and UE can use DRX method to monitor PICH. If UE is in the CELL_FACH or CELL_DCH statesUTRAN sends paging type 2.
p
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Page39
Paging Caused by CNUE NodeB 1 NodeB 2 RNC 1 RNC 2 RANAP RANAP RRC RRC Paging Type 1 RRC Paging RANAP Paging RANAP MSC
Paging Type 1
RRC
Paging Type1 Without RRC Connection UE NodeB 1 RNC 1 MSC
RRC Connection Establish RANAP RRC Paging Type 2 RRC Paging RANAP
PagingType2 With RRC Connection Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved. PDF created with pdfFactory Pro trial version www.pdffactory.com Page40
Paging Caused by UTRAN
UE
NodeB1
RNC1
RRC
Paging Type 1
RRC
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Page41
Contents3. UTRAN Signaling Procedure3.1 System Information Broadcast 3.2 Paging 3.3 Call Process 3.4 Handover
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Page42
Introduction of Call Processl
In WCDMA system, a call process includes the following basic signaling flows:p
RRC connection flow Direct transfer message flow Authentication flow (optional) Security flow (optional) RAB establish flow Call proceeding NAS signaling before correlative bearer release Correlative bearer release
p
p
p
p
p
p
p
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Page43
RRC Connection Establishment Flow (DCH)UERRC
Node B1. CCCH: RRC Connection Request
Serving RNCRRC Allocate RNTI Select L1 and L2 parameters
NBAP
2. Radio Link Setup Request
NBAP
Start RXNBAP
3. Radio Link Setup Response
NBAP
4. ALCAP Iub Data Transport Bearer SetupDCH - FP DCH - FP
5. Downlink Synchronization 6. Uplink Synchronization
DCH - FP DCH - FP
Start TX
RRC
7. CCCH: RRC Connection Set upNBAP
RRC NBAP RRC
8. Radio Link Restore Indication
RRC
9. DCCH: RRC Connection Setup Complete
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Page44
Direct Transfer Message FlowUERRC
NodeBInitial DT
RNCRRC SCCP SCCP RANAP RANAP Connect Request Connect Confirm Initial UE Message Common ID
CN
SCCP SCCP RANAP RANAP
l
In Iu interface, radio network layer reports the RANAP information and NAS information. NAS information is taken as directed message in RANAP information.
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Common ID
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Authentication and Security FlowUERRC Connection Setup Initial DT
RNCInitial UE Message (CM Service Request) Common ID DL DT (Authentication Request) DL DT (Authentication Response) DL DT (Authentication Response) Security Mode Command Security Mode Command DL DT (Authentication Request)
CN
Security Mode Command Complete
Security Mode Command Complete
UL Direct Transfer (Setup)
Direct Transfer (Setup) Direct Transfer (Call Proceeding)
DL Direct Transfer (Call Proceeding)
RAB Assignment
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RAB Establishment FlowUE NodeB RNCRANAP Q.AAL2 Q.AAL2 NBAP NBAP Q.AAL2 Q.AAL2 FP FP RRC NBAP RRC
CNRAB Ass Req AAL2 Setup Req AAL2 Setup RspRANAP Q.AAL2 Q.AAL2
RL Recfg Prep RL Recfg Ready AAL2 Setup Req AAL2 Setup Rsp DL Sync UL Sync RB Setup RL Recfg Commit
NBAP NBAP Q.AAL2 Q.AAL2 FP FP RRC NBAP RRC RANAP
RB Setup Complete
RAB Ass Rsp
RANAP
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Page49
NAS Signaling (CS)UE MSC MSCPaging RRC and NAS signaling Connection Setup CM Service Request Authentication Request Authentication Response Security Mode Command Security Mode Command Complete Setup Call Proceeding RAB Assignment Alerting Connect Connect ACK Disconnect Release Release Complete RRC and NAS signaling Connection Setup Paging Response Authentication Request Authentication Response Security Mode Command Security Mode Command Complete Setup Call Confirmed RAB Assignment Alerting Connect Connect ACK Disconnect Release Release Complete
UE
UE Outgoing CallCopyright 2006 Huawei Technologies Co., Ltd. All rights reserved. PDF created with pdfFactory Pro trial version www.pdffactory.com
UE Terminating CallPage50
NAS Signaling (PS)UE SGSN SGSNPaging RRC and NAS signaling Connection Setup Service Request Authenticate and Ciphering Req Authenticate and Ciphering Rsp Security Mode Command Security Mode Command Complete Request PDP Context Activation Activate PDP Context Req RAB Assignment Activate PDP Context Accept Deactivate PDP Context Req Deactivate PDP Context Accept
UE
RRC and NAS signaling Connection Setup Service Request Authenticate and Ciphering Req Authenticate and Ciphering Rsp Security Mode Command Security Mode Command Complete Service Accept Activate PDP Context Req RAB Assignment Activate PDP Context Accept Deactivate PDP Context Req Deactivate PDP Context Accept
UE Outgoing Call
UE Terminating Call
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Page51
UE to UE CS Call Process (1)
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UE to UE CS Call Process (2)
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UE to UE CS Call Process (3)
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UE to UE CS Call Process (4)
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UE to UE CS Call Process (5)
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UE to UE CS Call Process (6)
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UE to UE CS Call Process (7)
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Activate PDP Context from UE (1)
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Activate PDP Context from UE (2)
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Activate PDP Context from Network (1)
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Activate PDP Context from Network (2)
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Contents3. UTRAN Signaling Procedure3.1 System Information Broadcast 3.2 Paging 3.3 Call Process 3.4 Handover
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Page63
Concepts about Soft Handoverl
Soft handover: the signals from different NodeBs are merged in RNC
l
Softer handover: the signals from different cells, but from the same NodeB are merged in NodeB
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Soft Handover FlowCore NetworkRNC
Node BAirBridge AirBridge AirBridge
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Soft Handover FlowCore NetworkRNC
Node BAirBridge AirBridge AirBridge
Merged in NodeB
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Soft Handover FlowCore NetworkRNC
Node BAirBridge AirBridge AirBridge
Merged in RNC
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Soft Handover Flow (SRNC-DRNC)Core Network Serving RNC
Drift RNCNode BAirBridge AirBridge AirBridge
Merged in SRNC
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Soft Handover Flow (SRNC Relocation)Core Network
RNC
Serving RNCNode BAirBridge AirBridge AirBridge
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Soft Handover Flow (Intra-RNC)CN CN CN
SRNC
SRNC
SRNC
NodeB
NodeB
NodeB
NodeB
NodeB
NodeB
Before Handover
During Handover
After Handover
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Page70
Soft Handover Flow (Add Branch in RNC)UERRC
NodeB (new)DCCH: Measurement Report
SRNCRRC Decision to setup new RL
NBAP Start RX description NBAP
Radio Link Setup Request
NBAP
Radio Link Setup Response
NBAP
ALCAP Iub Data Transport Bearer Setup DCH-FP DCH-FP Downlink Synchronisation Uplink Synchronisation DCH-FP DCH-FP
RRC RRC
Start TX description DCCH: Active Set Update DCCH: Active Set Update Complete
RRC RRC
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Page71
Soft Handover Flow (Del Branch in RNC)UERRC
NodeB (old)DCCH: Measurement Report
SRNCRRC Decision to delete a RL
RRC RRC
DCCH: Active Set Update DCCH: Active Set Update Complete Radio Link Deletion Request
RRC RRC NBAP
NBAP
Stop Rx and Tx Radio Link Deletion Response
NBAP
NBAP
ALCAP Iub Transport Bearer release
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Page73
Inter-frequency Handover (Intra-RNC)CN CN
SRNC
SRNC
NodeB
NodeB
NodeB
NodeB
Before Handover
After Handover
Radio Link can not exist simultaneouslyCopyright 2006 Huawei Technologies Co., Ltd. All rights reserved. PDF created with pdfFactory Pro trial version www.pdffactory.com Page74
Inter-frequency Handover (Intra-RNC)UERRC
Source NodeB
Target NodeBDCCH: Measurement Report
SRNCRRC Decision to setup new RL
NBAP
1. Radio Link Setup Request
NBAP
Start RX description 2. Radio Link Setup Response NBAP
NBAP
3 ALCAP Iub Data Transport Bearer Setup DCH-FP DCH-FP 4. Downlink Synchronisation 5.Uplink Synchronisation DCH-FP DCH-FP
Start TX description RRC NBAP RRC NBAP NBAP 6.DCCH : Physical Channel Reconfiguration 7. Radio Link Failure Indication 8. DCCH : Physical Channel Reconfiguration Complete 9. Radio Link Deletion Request 10. Radio Link Deletion Response RRC NBAP RRC NBAP NBAP
11. ALCAP Iub Data Transport Bearer Release
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Page75
Inter-RAT Handover Flow (UMTS->GSM)
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Inter-RAT Handover Flow (GSM->UMTS)
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Page77
Thank youwww.huawei.com
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