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

Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved. PDF created with pdfFactory Pro trial version www.pdffactory.com

Page1

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


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)


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


Iu-CS InterfaceRadio Network LayerControl Plane RANAP User plane Iu UP


Transport Network Control Plane



ALCAP ALCAPSCCP A MTP3-B SAAL NNI B MTP3-B SAAL NNI AAL2 PATH

ATM Physical Layer


Page9

Iu-PS InterfaceRadio Network LayerControl Plane RANAP User plane Iu UP


Transport Network User Plane SCCP MTP3-B

Transport Network User Plane GTP-U C UDP IP AAL Type 5

SAAL NNI

ATM Physical Layer


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


Page11

Iur InterfaceRadio Network LayerControl Plane RANAP User plane Iur Data Stream Transport Network Control Plane




ALCAP ALCAPSCCP A MTP3-B SAAL NNI B MTP3-B SAAL NNI AAL2 PATH

ATM Physical Layer


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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


CRNCCNIu

CRNC

Iub

NodeB

... ...Cell

NodeBCell Cell

l

The CRNC owns the radio resources of a cell


Page15

RAB, RB and RL

RAB RB UE RL NodeB

RNC

CN

UTRAN


Page16

UE Working Modes and Statesl l

Idle Mode Connected Modep

Cell_DCH Cell_FACH Cell_PCH URA_PCH

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p

p


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

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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

l

The idle mode tasks can be divided into three processes:p

PLMN selection and reselection Cell selection and reselection Location registration

p

p


Page18

Connected Model

When UE is in connected mode, there is normally an RRC connection between UE and UTRAN.

l

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


Page19

Connected Model

Cell-DCHp

In active state Communicating via its dedicated channels UTRAN knows which cell UE stays in

p

p


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

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p


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


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


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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Page26

Contents3. UTRAN Signaling Procedure3.1 System Information Broadcast 3.2 Paging 3.3 Call Process 3.4 Handover


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


RRC

RRC


RRC


Page28

Introduction of System Informationl

MIB:p

PLMN tag Scheduling information for SB (Scheduling Block) Scheduling information for SIB (System Information Block)

p

p

l l

SB1: scheduling information for SIB SB2: scheduling information for SIB (extended)


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

l l


Page30


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

l l


Page31


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

l l


Page32

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


Page33


System info type 2p

URA information


Page34


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


Page35


The configuration information for the following physical channels and the counterpart transport channelsp

PCCPCH SCCPCH PICH AICH PRACH

p

p

p

p


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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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


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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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


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


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.


Page45

Common ID


Page47

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


Page48

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


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


Page51

UE to UE CS Call Process (1)


Page52



Page53



Page54



Page55



Page56



Page57



Page58

Activate PDP Context from UE (1)


Page59

Activate PDP Context from UE (2)


Page60

Activate PDP Context from Network (1)


Page61

Activate PDP Context from Network (2)


Page62



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


Page64

Soft Handover FlowCore NetworkRNC

Node BAirBridge AirBridge AirBridge


Page65



Merged in NodeB


Page66



Merged in RNC


Page67

Soft Handover Flow (SRNC-DRNC)Core Network Serving RNC

Drift RNCNode BAirBridge AirBridge AirBridge

Merged in SRNC


Page68

Soft Handover Flow (SRNC Relocation)Core Network

RNC

Serving RNCNode BAirBridge AirBridge AirBridge


Page69

Soft Handover Flow (Intra-RNC)CN CN CN

SRNC

SRNC

SRNC

NodeB

NodeB

NodeB

NodeB

NodeB

NodeB

Before Handover

During Handover

After Handover


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


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


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


Page75

Inter-RAT Handover Flow (UMTS->GSM)


Page76

Inter-RAT Handover Flow (GSM->UMTS)


Page77

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