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Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
WCDMA UTRAN Interface and Signaling Procedure
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Page1Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Objectives
l Upon completion of this course, you will be able to:
p Understand UTRAN interface and structure
p Understand the definitions about UTRAN network elements
p Understand UTRAN signaling procedure
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Page2Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
1. UTRAN Network Overview
2. Basic Concepts about UTRAN
3. UTRAN Signaling Procedure
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Page3Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
1. UTRAN Network Overview
2. Basic Concepts about UTRAN
3. UTRAN Signaling Procedure
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Page4Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
UMTS Structure
RNS
RNCRNC
RNS
RNCRNC
Core Network
NodeBNodeB NodeBNodeB NodeBNodeB NodeBNodeB
IuIu IuIu
IurIur
IubIub IubIubIubIub IubIub
UTRAN
User Equipment
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Page5Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Uu Interface
L3co
ntro
l
cont
rol
cont
rol
cont
rol
Logical Channels
Transport Channels
C-plane signaling U-plane information
PHY
L2/MAC
L1
RLC
DCNtGC
L2/RLC
MAC
RLCRLCRLC
Duplication avoidance
UuS boundary
L2/BMC
control
PDCPPDCP L2/PDCP
DCNtGC
Radio Bearers
RRC
RLCRLCRLC
RLC
BMC
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Page6Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
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.
Application Protocol
Data Stream(s)
ALCAP(s)
Transport Network
Layer
Physical Layer
Signalling Bearer(s)
Control Plane User Plane
Transport NetworkUser Plane
Transport Network Control Plane
Radio Network
Layer
Signalling Bearer(s)
Data Bearer(s)
Transport NetworkUser Plane
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Page8Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
RNL Control Plane Application Protocol
NBAP Node B Application Part
RANAP Radio Access Network Application Part
RNSAP Radio Network Subsystem Application Part
RRC Radio Resource Control
NodeB
RNC
CN
UE
RANAP
NBAP
RNSAPRRC RNC
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Page9Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Iu-CS Interface
ALCAPALCAP
Control Plane
Transport NetworkControl Plane
User planeRadioNetworkLayer
Transport NetworkUser Plane
TransportNetworkLayer
A B
RANAP
AAL2 PATH
ATM
Physical Layer
SAAL NNI
SCCPMTP3-B
Iu UP
SAAL NNI
MTP3-B
Transport NetworkUser Plane
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Page10Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Iu-PS Interface
Control Plane User planeRadioNetworkLayer
Transport NetworkUser PlaneTransport
NetworkLayer
Transport NetworkUser Plane
C
RANAP
ATM
SAAL NNI
SCCP
MTP3-B
Iu UP
AAL Type 5IP
UDP
GTP-U
Physical Layer
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Page11Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Iub Interface
ALCAPALCAP
Control Plane
Transport NetworkControl Plane
User planeRadioNetworkLayer
Transport NetworkUser Plane
TransportNetworkLayer
Transport NetworkUser Plane
NBAP
AAL2 PATH
ATM
Physical Layer
SAAL UNI
Iub FP
SAAL UNI
NCP CCP
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Page12Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Iur Interface
ALCAPALCAP
Control Plane
Transport NetworkControl Plane
User planeRadioNetworkLayer
TransportNetworkLayer
A B
RANAP
AAL2 PATH
ATM
Physical Layer
SAAL NNI
SCCPMTP3-B
Iur Data Stream
SAAL NNI
MTP3-B
Transport NetworkUser Plane
Transport NetworkUser Plane
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Page13Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
1. UTRAN Network Overview
2. Basic Concepts about UTRAN
3. UTRAN Signaling Procedure
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Page14Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
SRNC / DRNC
l SRNC and DRNC are concepts for a connected UE.
l The SRNC handles the connection to one UE, and may borrow radio resources of a certain cell from the DRNC.
l Drift RNCs support the Serving RNC by providing radio resources
l A UE in connection state has at least one and only one SRNC, but can has 0 or multiple DRNCs
CN
SRNC DRNC
Iu Iur
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Page15Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
CRNC
l The CRNC owns the radio resources of a cell
Iub
NodeBCell Cell Cell
NodeB ... ...
Iu
CRNC
CN
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Page16Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
RAB, RB and RL
RAB
RB
RLNodeB
RNC CNUE
UTRAN
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Page17Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
UE Working Modes and States
l Idle Mode
l Connected Mode
p Cell_DCH
p Cell_FACH
p Cell_PCH
p URA_PCH
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Page18Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Idle Mode
l The UE has no relation to UTRAN, only to CN. For data transfer, a
signalling connection has to be established.
l UE camps on a cell
p It enables the UE to receive system information from the PLMN
p UE can receive paging message from the PICH of a cell
p It enables the UE to receive cell broadcast services.
l The idle mode tasks can be divided into three processes:
p PLMN selection and reselection
p Cell selection and reselection
p Location registration
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Page19Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Connected Mode
l 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
p UTRAN Registration Area (URA) level
p Dedicated transport channels (DCH)
p Common transport channels (RACH / FACH, DSCH)
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Page21Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Connected Mode
l Cell-DCH
p In active state
p Communicating via its dedicated channels
p UTRAN knows which cell UE stays in
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Page22Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Connected Mode
l Cell-FACH
p In active state
p Few data to be transmitted both in uplink and in downlink. There
is no need to allocate dedicated channel for this UE
p Downlink uses FACH and uplink uses RACH
p UE needs to monitor the FACH for its information
p UTRAN knows which cell the UE stays in
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Page23Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Connected Mode
l Cell-PCH
p No data to be transmitted or received
p Monitor PICH, to receive its paging
p UTRAN knows which cell the UE stays in
p UTRAN has to update cell information of UE when UE roams to
another cell
p Lower the power consumption of UE
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Page24Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Connected Mode
l URA-PCH
p No data to be transmitted or received
p Monitor PICH, to receive its paging
p UTRAN only knows which URA (which consists of multiple cells)
that UE stays
p UTRAN updates UE information only after UE has roamed to other
URA
p A better way to reduce the resource occupancy and signaling
transmission
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Page25Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
UE Working Modes and States
CELL_DCH CELL_FACH
CELL_PCHURA_PCH
IDLE
DEAD - Scan networks (PLMN)- Camp on a cell
- Monitor paging channel- Cell re-selection
- Dedicated channel- Common service, such as voice
- Reduce activity, DTX,and save powerRRC Connection
- Common channel- PS service with few
data to transmit
- Reduce activity further- Avoid unnecessary signaling
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Page26Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
1. UTRAN Network Overview
2. Basic Concepts about UTRAN
3. UTRAN Signaling Procedure
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Page27Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
3. UTRAN Signaling Procedure
3.1 System Information Broadcast
3.2 Paging
3.3 Call Process
3.4 Handover
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Page28Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
System Information Broadcast Flow
3. BCCH: System Information
1. System Information Update Request
UE Node B RNC
NBAPNBAP
RRCRRC
4. BCCH: System InformationRRCRRC
5. BCCH: System Information RRCRRC
2. System Information Update ResponseNBAPNBAP
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Page29Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Introduction of System Information
l MIB:
p PLMN tag
p Scheduling information for SB (Scheduling Block)
p Scheduling information for SIB (System Information Block)
l SB1: scheduling information for SIB
l SB2: scheduling information for SIB (extended)
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Page30Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Introduction of System Information
l SIB1: System information for NAS and the timer/counter for UE
l SIB2: URA information
l SIB3: Parameters for cell selection and cell re-selection
l SIB4: Parameters for cell selection and cell re-selection while UE is in
connected mode
l SIB5: Parameters for the common physical channels of the cell
l SIB6: Parameters for the common physical channels of the cell while
UE is in connected mode
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Page31Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Introduction of System Information
l SIB7: uplink interference level and the refreshing timer
l SIB8: the CPCH static information
l SIB9: the CPCH dynamic information
l SIB10: information to be used by UEs having their DCH controlled by
a DRAC procedure
l SIB11: measurement controlling information
l SIB12: measurement controlling information in connected mode
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Page32Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Introduction of System Information
l SIB13: ANSI-41 system information
l SIB14: the information in TDD mode
l SIB15: the position service information
l SIB16: the needed pre-configuration information for handover from
other RAT to UTRAN
l SIB17: the configuration information for TDD
l 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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Page33Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
System Information Block Type 1
l System information type 1
p The NAS system information
p CS domain DRX: K=6, then DRX
period is 2^k= 2^6= 64TTI=640 ms
p PS domain DRX: K=6, then DRX
period is 2^k=2^6=64TTI =640 ms
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Page34Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
System Information Block Type 2
l System info type 2
p URA information
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Page35Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
System Information Block Type 3
l The references for cell selection and
re-selection
p Qhyst2s
p Sintrasearch
p Sintersearch
p Sinterratsearch
p Qqualmin
p Qrxlemin
p T reselection
p Max Allowed UE TX power
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Page36Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
System Information Block Type 5
l The configuration information for
the following physical channels and
the counterpart transport channels
p PCCPCH
p SCCPCH
p PICH
p AICH
p PRACH
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Page37Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
System Information Block Type 7 and 11
l System info type 7
p Including the UL interference level which is used for open loop power
control
p Including the Expiration Time Factor which is used for refreshing the SIB7
periodically
l System info type 11
p The neighbor cell information for cell re-selection in IDLE mode
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Page38Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
3. UTRAN Signaling Procedure
3.1 System Information Broadcast
3.2 Paging
3.3 Call Process
3.4 Handover
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Page39Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Paging Types
l 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.
p If UE is in the CELL_FACH or CELL_DCH states,UTRAN sends
paging type 2.
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Page40Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Paging Caused by CN
Paging Type1 Without RRC Connection
UE NodeB 1 RNC 1
RANAP
NodeB 2 RNC 2
RANAP
MSC
RANAP
Paging
Paging
RRC
RRCRRC
Paging Type 1
UE RNC 1
RANAP
MSC
RANAPPaging
PagingType2 With RRC Connection
RRC Connection Establish
NodeB 1
RRCPaging Type 2
RRC
RANAP
RRC
Paging Type 1
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Page41Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Paging Caused by UTRAN
UE RNC1NodeB1
RRCPaging Type 1RRC
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Page42Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
3. UTRAN Signaling Procedure
3.1 System Information Broadcast
3.2 Paging
3.3 Call Process
3.4 Handover
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Page43Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Introduction of Call Process
l In WCDMA system, a call process includes the following basic
signaling flows:
p RRC connection flow
p Direct transfer message flow
p Authentication flow (optional)
p Security flow (optional)
p RAB establish flow
p Call proceeding
p NAS signaling before correlative bearer release
p Correlative bearer release
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Page44Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
RRC Connection Establishment Flow (DCH)
5. Downlink Synchronization
UE Node B Serving RNC
DCH - FP
Allocate RNTISelect L1 and L2parameters
RRCRRC
NBAPNBAP3. Radio Link Setup Response
NBAPNBAP2. Radio Link Setup Request
RRCRRC7. CCCH: RRC Connection Set up
Start RX
Start TX
4. ALCAP Iub Data Transport Bearer Setup
RRCRRC9. DCCH: RRC Connection Setup Complete
6. Uplink Synchronization
NBAPNBAP8. Radio Link Restore Indication
DCH - FP
DCH - FP
DCH - FP
1. CCCH: RRC Connection Request
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Page45Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Direct Transfer Message Flow
l In Iu interface, radio network layer reports the RANAP
information and NAS information. NAS information is taken
as directed message in RANAP information.
UE NodeB RNC CN
RRC RRC
SCCP SCCP
SCCP SCCP
Initial DT
Connect Request
Connect Confirm
RRC
RANAP RANAPInitial UE Message
RANAP RANAPCommon ID
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Page47Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Common ID
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Page48Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Authentication and Security Flow
UE RNC CN
RRC Connection Setup Initial DT Initial UE Message
(CM Service Request)
DL DT (Authentication Request)DL DT (Authentication Request)
DL DT (Authentication Response)DL DT (Authentication Response)
Common ID
Security Mode CommandSecurity Mode Command
Security Mode Command Complete Security Mode Command Complete
RAB Assignment
UL Direct Transfer (Setup) Direct Transfer (Setup)
Direct Transfer (Call Proceeding)DL Direct Transfer (Call Proceeding)
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Page49Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
RAB Establishment FlowNodeBUE CNRNC
RANAPRANAPRAB Ass Req
Q.AAL2 Q.AAL2
Q.AAL2Q.AAL2
NBAPNBAP
AAL2 Setup Req
RL Recfg Prep
AAL2 Setup Rsp
NBAPNBAPRL Recfg Ready
Q.AAL2Q.AAL2 AAL2 Setup Req
Q.AAL2Q.AAL2 AAL2 Setup Rsp
FPFP DL Sync
FPFPUL Sync
RRC RRCRB Setup
NBAPNBAP RL Recfg Commit
RRC RRCRB Setup Complete
RANAPRANAPRAB Ass Rsp
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Page50Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
NAS Signaling (CS)UE MSC
CM Service Request
RRC and NAS signaling Connection Setup
Authentication Request
Authentication Response
Security Mode Command
Security Mode Command Complete
RAB Assignment
SetupCall Proceeding
Alerting
Connect Connect ACKDisconnect
ReleaseRelease Complete
UE Outgoing Call UE Terminating Call
UEMSC
Paging Response
Authentication Request
Authentication Response
Security Mode Command
Security Mode Command Complete
RAB Assignment
Setup
Call Confirmed
Alerting
Connect
Connect ACKDisconnect
ReleaseRelease Complete
Paging
RRC and NAS signaling Connection Setup
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Page51Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
NAS Signaling (PS)UE SGSN
Service Request
RRC and NAS signaling Connection Setup
Authenticate and Ciphering Req
Security Mode Command
Security Mode Command Complete
RAB Assignment
Service Accept
Activate PDP Context Req
Activate PDP Context Accept
Deactivate PDP Context Req
Deactivate PDP Context Accept
UE Outgoing Call
Authenticate and Ciphering Rsp
UE Terminating Call
UE
Service Request
Authenticate and Ciphering Req
Security Mode Command
Security Mode Command Complete
RAB Assignment
Request PDP Context Activation
Activate PDP Context Req
Activate PDP Context Accept
Deactivate PDP Context Req
Deactivate PDP Context Accept
Paging
RRC and NAS signaling Connection Setup
SGSN
Authenticate and Ciphering Rsp
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Page52Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
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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Page55Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
UE to UE CS Call Process (4)
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UE to UE CS Call Process (5)
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Page57Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
UE to UE CS Call Process (6)
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UE to UE CS Call Process (7)
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Page59Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Activate PDP Context from UE (1)
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Activate PDP Context from UE (2)
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Page61Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Activate PDP Context from Network (1)
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Activate PDP Context from Network (2)
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Page63Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
3. UTRAN Signaling Procedure
3.1 System Information Broadcast
3.2 Paging
3.3 Call Process
3.4 Handover
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Page64Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Concepts about Soft Handover
l 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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Page65Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Soft Handover Flow
RNC
AirBridgeAirBridge
AirBridgeAirBridge
AirBridgeAirBridge
Core NetworkCore Network
Node B
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Page66Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Soft Handover Flow
RNC
AirBridgeAirBridge
AirBridgeAirBridge
AirBridgeAirBridge
Merged in NodeB
Core NetworkCore Network
Node B
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Page67Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Soft Handover Flow
Merged in RNC
RNC
AirBridgeAirBridge
AirBridgeAirBridge
AirBridgeAirBridge
Core NetworkCore Network
Node B
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Page68Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Soft Handover Flow (SRNC-DRNC)
Merged in SRNC
Node B
AirBridgeAirBridge
AirBridgeAirBridge
AirBridgeAirBridge
Serving RNC
Drift RNC
Core NetworkCore Network
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Page69Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Soft Handover Flow (SRNC Relocation)
Node B
AirBridgeAirBridge
AirBridgeAirBridge
AirBridgeAirBridge
Serving RNC
RNC
Core NetworkCore Network
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Page70Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Soft Handover Flow (Intra-RNC)
Before Handover After Handover
SRNC
NodeBNodeB
SRNC
NodeBNodeB
SRNC
NodeBNodeB
During Handover
CNCN CN
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Page71Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Soft Handover Flow (Add Branch in RNC)
DCCH: Active Set Update Complete
DCCH: Active Set Update
UE NodeB (new) SRNC
NBAPRadio Link Setup RequestNBAP
NBAPRadio Link Setup Response
NBAP
ALCAP Iub Data Transport Bearer Setup
Start RX description
DCH-FPDownlink Synchronisation
DCH-FP
DCH-FPUplink SynchronisationDCH-FP
Start TX description
RRC
RRC
RRC
RRC
Decision to setupnew RL
RRC RRCDCCH: Measurement Report
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Page73Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Soft Handover Flow (Del Branch in RNC)
DCCH: Active Set Update Complete
DCCH: Active Set Update
UE NodeB (old) SRNC
NBAPRadio Link Deletion Request
NBAP
NBAPRadio Link Deletion Response
NBAP
RRC
RRC
RRC
RRC
Stop Rx and Tx
Decision to deletea RL
ALCAP Iub Transport Bearer release
RRC RRCDCCH: Measurement Report
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Page74Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Inter-frequency Handover (Intra-RNC)
Before Handover After Handover
Radio Link can not exist simultaneously
SRNC
NodeBNodeB
SRNC
NodeBNodeB
CNCN
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Page75Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Inter-frequency Handover (Intra-RNC)
8. DCCH : Physical Channel Reconfiguration Complete
6.DCCH : Physical Channel Reconfiguration
9. Radio Link Deletion Request
10. Radio Link Deletion Response
7. Radio Link Failure Indication
UE Target NodeB SRNC
NBAP1. Radio Link Setup RequestNBAP
NBAP2. Radio Link Setup ResponseNBAP
3 ALCAP Iub Data Transport Bearer Setup
Start RX description
DCH-FP4. Downlink SynchronisationDCH-FP
DCH-FP5.Uplink SynchronisationDCH-FP
Start TX description
RRC
RRC
RRC
RRC
Decision to setup new RL
NBAPNBAP
Source NodeB
NBAPNBAP
NBAPNBAP
11. ALCAP Iub Data Transport Bearer Release
RRC RRCDCCH: Measurement Report
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Page76Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Inter-RAT Handover Flow (UMTS->GSM)
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Page77Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Inter-RAT Handover Flow (GSM->UMTS)
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Thank youwww.huawei.com
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