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WCDMA UTRANInterface and SignalingProcedure
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Objectives
Upon completion of this course, you will be able to:
Understand UTRAN interface and structure
Understand the definitions about UTRAN network elements
Understand UTRAN signaling procedure
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Contents
1. UTRAN Network Overview
2. Basic Concepts about UTRAN
3. UTRAN Signaling Procedure
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Uu Interface
L3
c o n t r o l
c
o n t r o l
c
o n t r o l
c o n t r o l
C-plane signaling U-plane information
PHY
L2/MAC
L1
RLC
DCNtGC
L2/RLC
MAC
RLCRLC
RLC
Duplication avoidance
UuS boundary
L2/BMC
control
PDCP
PDCP L2/PDCP
DCNtGC
RRC
RLC
RLC
RLC
RLC
BMC
radio bearer
logical channel
transport channel
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RNL Control Plane ApplicationProtocol
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
RNSAP RRC RNC
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Iu-CS Interface (based on ATM)
ALCAP
Control Plane
Transport Network
Control Plane
User planeRadioNetwork
Layer
Transport Network
User PlaneTransport
Network
LayerA B
RANAP
AAL2 PATH
ATM
Physical Layer
SAAL NNI
SCCP
MTP3-B
Iu UP
SAAL NNI
MTP3-B
Transport Network
User Plane
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Iu-CS Interface (based on IP)
Control Plane User planeRadioNetwork
Layer
Transport Network
User PlaneTransport
Network
Layer
RANAP
IP
Physical Layer
IP
SCTP
Iu UP
Transport Network
User Plane
DATA LINK DATA LINK
M3UA
SCCPRTP/RTCP
UDP
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Iu-PS Interface (based on ATM)
Control Plane User planeRadio
Network
Layer
Transport Network
User PlaneTransportNetwork
Layer
Transport Network
User Plane
C
RANAP
ATM
SAAL NNI
SCCP
MTP3-B
Iu UP
AAL Type 5
IP
UDP
GTP-U
Physical Layer
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Iu-PS Interface (based on IP)
Control Plane User planeRadioNetwork
Layer
Transport Network
User PlaneTransport
Network
Layer
RANAP
IP
Physical Layer
IP
SCTP
Iu UP
Transport Network
User Plane
DATA LINK DATA LINK
M3UA
SCCPGTP-U
UDP
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Iub Interface (based on ATM)
ALCAP
Control Plane
Transport Network
Control Plane
User planeRadio
Network
Layer
Transport Network
User Plane
Transport
Network
Layer
Transport Network
User Plane
NBAP
AAL2 PATH
ATM
Physical Layer
SAAL UNI
Iub FP
SAAL UNI
NCP CCP
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Iub Interface (based on IP)
Control Plane User planeRadio
Network
Layer
Transport Network
User Plane
Transport
Network
Layer
Transport Network
User Plane
NBAP
IP
DATA LINK
Physical Layer
IP
Iub FP
NCP CCP
DATA LINK
SCTP UDP
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Iur Interface (based on ATM)
ALCAP
Control Plane
Transport Network
Control Plane
User planeRadioNetwork
Layer
Transport
Network
LayerA B
RNSAP
AAL2 PATH
ATM
Physical Layer
SAAL NNI
SCCP
MTP3-B
Iur Data
Stream
SAAL NNI
MTP3-B
Transport Network
User Plane
Transport Network
User Plane
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Contents
1. UTRAN Network Overview
2. Basic Concepts about UTRAN
3. UTRAN Signaling Procedure
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RAB, RB and RL
RAB
RB
RLNodeB
RNC CNUE
UTRAN
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UE Working Modes and States
Idle Mode
Connected Mode
CELL_DCH
CELL_FACH
CELL_PCH
URA_PCH
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Idle Mode
The UE has no relation to UTRAN, only to CN. For data
transfer, a signaling connection has to be established.
UE camps on a cell
It enables the UE to receive system information from the PLMN
UE can monitor PICH of a cell for paging
The idle mode tasks can be divided into three processes:
PLMN selection and reselection
Cell selection and reselection
Location registration
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Connected Mode
When UE is in connected mode
The UE position can be known on different levels:
Cell level (CELL_DCH/CELL_FACH/CELL_PCH)
UTRAN Registration Area (URA) level (URA_PCH)
The UE can use different types of channels in connected
mode
Dedicated transport channels (CELL_DCH)
Common transport channels (CELL_FACH)
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Connected Mode
Cell-DCH
In active state
Communicating via its dedicated channels
UTRAN knows which cell UE stays in
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Connected Mode
Cell-FACH
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
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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Connected Mode
Cell-PCH
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
Lower the power consumption of UE
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Connected Mode
URA-PCH
No data to be transmitted or received
Monitor PICH, to receive its paging
UTRAN only knows which URA (which consists of multiplecells) 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
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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, DRX,and save powerRRC Conn ect ion
- Common channel- PS service with few
data to transmit
- Reduce activity further- Avoid unnecessarysignaling
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Contents
1. UTRAN Network Overview
2. Basic Concepts about UTRAN
3. UTRAN Signaling Procedure
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Contents
3. UTRAN Signaling Procedure
3.1 System Information Broadcast
3.2 Paging
3.3 Call Process
3.4 Handover
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System Information Broadcast Flow
UE RNC NodeB
1. System Information Update
Request
2. System Information Update
Response
3. System Information
4. System Information
5. System Information
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Introduction of System Information
MIB:
PLMN tag
Scheduling information for
SB (Scheduling Block)
Scheduling information for
SIB (System Information
Block)
SB1: scheduling information forSIB
SB2: scheduling information for
SIB (extended)
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Introduction of System Information
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 Information
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 2
System info type 2
URA information
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System Information Block Type 3
The references for cell selectionand re-selection
Qhyst2s
Sintrasearch
Sintersearch
Sinterratsearch
Qqualmin
Qrxlevmin
T reselection
Max Allowed UE TX power
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System Information Block Type 5
The configuration informationfor the following physical
channels and the counterpart
transport channels
PCCPCH
SCCPCH
PICH
AICH
PRACH
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System Information Block Type 7 and 11
System info type 7 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
System info type 11
The neighbor cell information for cell re-selection in IDLE mode
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Contents
3. UTRAN Signaling Procedure
3.1 System Information Broadcast
3.2 Paging
3.3 Call Process
3.4 Handover
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Paging Initiation
CN initiated paging
Establish a signaling connection
UTRAN initiated paging
Trigger the cell update procedure
Trigger reading of updated system information
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Paging Type 1
If UE is in CELL_PCH,URA_PCH or IDLE state,the paging
message will be transmitted on PCCH with paging type 1
CN RNC1 RNC2 NODEB1.1 NODEB2.1 UE
RANAPRANAP
RANAP RANAP
PCCH: PAGING TYPE 1
PAGING
PAGING
PCCH: PAGING TYPE 1
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Paging Type 2
If UE is in CELL_DCH or CELL_FACH state,the paging
message will be transmitted on DCCH with paging type 2
CN SRNC UE
RANAPRANAP
PAGING
RRCRRC
DCCH: PAGING TYPE 2
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Contents
3. UTRAN Signaling Procedure
3.1 System Information Broadcast
3.2 Paging
3.3 Call Process
3.4 Handover
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Introduction of Call Process
In WCDMA system, a call process includes the following basicsignaling flows:
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
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RRC Connection Establishment Flow(CCH)
UE SRNC NodeB
1. RRC Connection Request
2. RRC Connection Setup
3. RRC Connection Setup Complete
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RRC Connection Establishment Flow(DCH)
UE SRNC NodeB
2. Radio Link Setup Request
3. Radio Link Setup Response
1. RRC Connection Request
5. RRC Connection Setup
4. ALCAP Iub Data Transport
Bearer Setup
6. RRC Connection Setup Complete
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Direct Transfer Message Flow
In Iu interface, radio network layer reports the RANAP
information and NAS information. NAS information is
taken as directed message in RANAP information.
UE CNSRNC
2. Initial UE Message (CM
Service Request)
1. Initial Direct Transfer
3. Common ID
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Common ID
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Authentication and Security FlowUE CNSRNC
1. Direct Transfer (Authentication
Request)
2. Downlink Direct Transfer
3. Uplink Direct Transfer
4. Direct Transfer (Authentication
Response)
5. Security Mode Command
6. Security Mode Command
7. Security Mode Command
Complete8. Security Mode Command
Complete
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Call Setup FlowUE CNSRNC
2. Direct Transfer (Setup)
1. Uplink Direct Transfer
4. Downlink Direct Transfer
3. Direct Transfer (Call Proceeding)
6. Direct Transfer (Alerting)
5. RAB Establishment
7. Downlink Direct Transfer
8. Direct Transfer (Connect)
9. Downlink Direct Transfer
10. Uplink Direct Transfer 11. Direct Transfer (Connect
Acknowledge)
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RAB Establishment FlowUE SRNC NodeB
3. Radio Link
Reconfiguration Prepare
4. Radio LinkReconfiguration Ready
5. ALCAP Iub Data Transport
Bearer Setup
8. Radio Bearer Setup Complete
CN
9. RAB Assignment
Response
2. Iu-CS AAL2 Setup
1. RAB AssignmentRequest
6. Radio Bearer Setup
7. Radio LinkReconfiguration Commit
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RRC Connection Release Flow (CCH)
UE SRNC NodeB
1. RRC Connection Release
2. RRC Connection Release Complete
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RRC Connection Release Flow (DCH)
UE SRNC NodeB
1. RRC Connection Release
3. Radio Link Deletion
Request
4. Radio Link Deletion
Response
5. ALCAP Iub Data Transport
Bearer Release
2. RRC Connection Release Complete
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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
Setup
Call Proceeding
Alerting
Connect
Connect ACK
Disconnect
Release
Release 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 ACK
Disconnect
Release
Release Complete
PagingRRC and NAS signaling Connection Setup
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UE to UE CS Call Process (1)UE1 RNC1 NodeB1
RRC Connection Req
RRC Connection Setup
CN NodeB2RNC2 UE2
RL Setup ReqRL Setup Rsp
ALCAP Iub DataTransport Bearer Setup
RRC Connection Setup
Cmp
Initial DT Initial UE
Message (CM
Service Req)
DT
(Authentication
Req)DL DT
UL DT DT
(Authentication
Rsp)
Common ID
Security Mode
CmdSecurity Mode Cmd
Security Mode
Cmp
Security Mode Cmp
UL DTDT (Setup)
DT (Call
Proceeding)DL DT
RAB Ass Req
Iu-CS AAL2 Setup
RL Recfg Prep
RL Recfg
Ready
PagingPaging Type 1
RRC Connection Req
RL Setup Req
RL Setup Rsp
ALCAP Iub Data
Transport Bearer Setup
RRC Connection Setup
RRC Connection Setup Cmp
ALCAP Iub Data
Transport Bearer Setup
RB Setup
RL Recfg
CommitRB Setup Cmp
RAB Ass Rsp
RRC Connection
Setup
NAS Signaling
Setup
Authentication
and Security Flow
NAS Signaling
RAB
Establishment
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UE to UE CS Call Process (3)UE1 RNC1 NodeB1 CN NodeB2RNC2 UE2
Iu-CS AAL2 Release
DL DT
RL Rel Req
RL Rel Rsp
ALCAP Iub Data
Transport Bearer
Release
DT (Release)
DT
(Disconnect)
UL DT
DT (R elease)
DT
(Disconnect)
DT (R elease
Cm p)
RRC Connection Rel Req
RRC Connection Rel Cmp
Iu R elease
Cmp
DL DT
UL DTDT (Release
Cmp) UL DT
DL DT
Iu Release
Cmd
Iu Release
Cmp
Iu R elease
Cmd
Iu-CS AAL2 ReleaseRRC Connection Rel Req
RRC Connection Rel Cmp
RL Rel Req
RL Rel Rsp
ALCAP Iub Data
Transport Bearer
Release
NAS Signaling
(Call Release)
Iu Release
RRC Connection
Release
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PS Call ProcessUE1 RNC1 NodeB1
RRC Connection Request
RRC Connection Setup
CN
Radio Link Setup RequestRadio Link Setup Response
ALCAP Iub Data TransportBearer Setup
RRC Connection Setup Complete
Initial Direct Transfer Initial UE Message
(Service Request)
DT (Authentication
Request)DL DT
UL DTDT (Authentication
Response)
Common ID
Security Mode Command
Security Mode Command
Security Mode Complete
Security Mode Complete
UL DTDT (PDP Context
Request)
DL DT
RAB Assignment
Request
Radio Link Reconfiguration
Prepare
Radio Link Reconfiguration
Ready
ALCAP Iub Data Transport
Bearer Setup
Radio Bearer Setup
Radio Link Reconfiguration
Commit
Radio Bearer Setup CompleteRAB Assignment
Response
RRC Connection
Setup
NAS Signaling
Setup
Authentication
and Security Flow
NAS Signaling
(Call Setup)
RAB
Establishment
DT (Service Accept)
DT (PDP Context
Accept)DL DT
NAS Signaling
(Call Setup)
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Contents
3. UTRAN Signaling Procedure
3.1 System Information Broadcast
3.2 Paging
3.3 Call Process
3.4 Handover
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Concepts about Soft Handover
Soft handover: the signals from different NodeBs aremerged in RNC
Softer handover: the signals from different cells, but from
the same NodeB are merged in NodeB
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Soft Handover Flow
RNC (SRNC)
AirBridge
AirBridge
AirBridge
Core Network
Node B
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Soft Handover Flow
RNC (SRNC)
AirBridge
AirBridge
AirBridge
Merged in NodeB
Core Network
Node B
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Soft Handover Flow
Merged in RNC
RNC (SRNC)
AirBridge
AirBridge
AirBridge
Core Network
Node B
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Soft Handover Flow (SRNC-DRNC)
Merged in SRNC
Node B
AirBridge
AirBridge
AirBridge
Serving RNC
Drift RNC
Core Network
Soft Handover Flow (SRNC
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Soft Handover Flow (SRNCRelocation)
Node B
AirBridge
AirBridge
AirBridge
Serving RNC
RNC
Core Network
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Soft Handover Flow (Add Branch in AS)
Measurement Report
RNCUE
Active Set Update
Active Set Update Complete
NodeB(new)
RL Setup Req.
Decision to
setup new RL
RL Setup Rsp.
DL Synchronization
DL Synchronization
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Soft Handover Flow (Del Branch from AS)
Measurement Report
RNCUE
Active Set Update
Active Set Update Complete
NodeB (old)
RL Deletion Req.
Decision to
delete a RL
RL Deletion Rsp.
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Hard Handover
Before Handover After Handover
Radio Link can not exist simultaneously
SRNC
NodeB NodeB
SRNC
NodeB NodeB
CN CN
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Intra-Frequency Hard Handover
Intra-Frequency hard handover is triggered by 1D event
Measurement Control (Intra-freq)
RRC Connection Setup Procedure
RNCUE
Measurement Control (Intra-Freq)
Physical Channel Reconfiguration
Physical Channel Reconfiguration Complete
Decision to
setup new RL
Measurement Report (1D)
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Inter-frequency Handover
Measurement Report(2D)
Measurement Control (Intra-freq)
RRC Connection Setup Procedure
RNCUE
Measurement Control (Inter-Freq)
Decision to enter
compress mode
Physical Channel Reconfiguration
Physical Channel Reconfiguration Complete
Measurement Report
Decision to
setup new RL
Measurement Control (2D & 2F)
Physical Channel Reconfiguration
Physical Channel Reconfiguration Complete
Measurement Control (Intra-freq)
CS Domain Inter-RAT Handover Flow
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(UMTS->GSM)
Measurement Report(2D)
Measurement Control (Intra-freq)
RRC Connection Setup Procedure
RNCUE
Measurement Control (Inter-RAT)
Decision to enter
compress mode
Physical Channel Reconfiguration
Physical Channel Reconfiguration Complete
Measurement Report (GSM)
Decision tohandover to GSM
Measurement Control (2D & 2F)
Relocation Required
2G MSC3G MSC
Prepare Handover
BSC
Handover Request
Handover Request ACK
Prepare Handover
ResponseRelocation Command
Inter-System Handover Command
Handover Complete
Handover CompltetSend END
Signal RequestIu Release Command
Iu Release Complete
PS Domain Inter-RAT Handover Flow (UMTS-
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UE SGSNSRNC
3. Iu Release Command
4. Iu Release Complete
2. SRNS context transfer
1. UE triggers
inter-RAT cell
reselection
>GSM & UE in CELL_FACH, CELL_PCH orURA_PCH)
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Inter-RAT Handover Flow (GSM->UMTS)UE NodeB RNC 3G MSC 2G MSC BSS
RL setup requeset
RL setup response
RL Restore Indicaton
Handover Complete
UTRAN Capacity Info
UE Capacity Info Enquiry
Relocation Requeset
Prepare Handover
Handover Request
Handover Command
Send End Signal
Request
Inter-System to UTRAN Handover Command
Clear command
Clear complete
UTRAN Capacity Info Confirm
UE Capacity Info Confirm
Relocation Requeset
ACKPrepare Handover RSP
Relocation Complete
Send end signal
responseUE Capacity Info