3 WCDMA UTRAN Interface and Signaling Procedure ISSUE 1.21
Transcript of 3 WCDMA UTRAN Interface and Signaling Procedure ISSUE 1.21
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Revision Record
Course Code ProductProduct
VersionCourse Version ISSUE
OWA10 WRAN ALL 1.20
Developer/Modifier Time Approver New/Update
SUNTAN 2009-2-2 LIANGJIE Add notes
GUOYANG 2009-04-15 LIANGJIE BUG correction
GUOYANG 2009-12 LIANGJIE BUG correction
Don¶t Print This Page
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WCDMA UTRAN Interface
and Signaling Procedure
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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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UMTS Network Structure
RNS
RNC
RNS
RNC
Core Network
NodeB NodeB NodeB NodeB
Iu-CS Iu-PS
Iur
Iub IubIub Iub
CN
UTRAN
UEUu
CS PS
Iu-CSIu-PS
CSPS
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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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General Protocol Mode for UTRAN
Terrestrial Interface
The structure is based on the principle that the layers and planes
are logically independent of each other.
ApplicationProtocol
DataStream(s)
ALCAP(s)
Transport
Network
Layer
Physical Layer
Signaling
Bearer(s)
Control Plane User Plane
Transport Network
User Plane
Transport Network
Control Plane
Radio
Network
Layer
Signaling
Bearer(s)
Data
Bearer(s)
Transport Network
User Plane
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General Protocol Mode for UTRAN
Terrestrial Interface
The structure is based on the principle that the layers and planes
are logically independent of each other.
ApplicationProtocol
DataStream(s)
ALCAP(s)
Transport
Network
Layer
Physical Layer
Signaling
Bearer(s)
Control Plane User Plane
Transport Network
User Plane
Transport Network
Control Plane
Radio
Network
Layer
Signaling
Bearer(s)
Data
Bearer(s)
Transport Network
User Plane
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RNL Control Plane Application Protocol
NBAP Node B Application PartRANAP 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 planeRadio
Network
Layer
Transport Network
User Plane
Transport
Network
Layer A 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 planeRadio
Network
Layer
Transport Network
User Plane
Transport
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 NetworkUser PlaneTransport
Network
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 planeRadio
Network
Layer
Transport Network
User Plane
Transport
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 planeRadio
Network
Layer
Transport
Network
Layer A 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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Iur Interface (based on IP)
Control Plane User planeRadio
Network
Layer
Transport Network
User PlaneTransport
Network
Layer
RNSAP
IP
Physical Layer
IP
SCTP
Iur Data
Stream
Transport Network
User Plane
DATA LINK DATA LINK
M3UA
SCCP
UDP
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Contents
1. UTRAN Network Overview
2. Basic Concepts about UTRAN
3. UTRAN Signaling Procedure
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SRNC / DRNC
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 DRNCs
CN
SRNC DRNC
Interface
Data
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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 power RRC Connection
- 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
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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 for
SIB
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
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 Information
SIB13: AN SI -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 1
System information type 1
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
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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 selection
and re-selection
Qhyst2s
Sintrasearch
Sintersearch
Sinterratsearch
Qqualmin
Qrxlemin
T reselection
Max Allowed UE TX power
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System Information Block Type 5
The configuration information for
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 statethe 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 statethe paging
message will be transmitted on DCCH with paging type 2
CN SRNC UE
RANAPRANAP
PAGING
RRCRRCDCCH: 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 basic
signaling 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)
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RRC Connection Establishment Flow (DCH)
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RRC Connection Establishment Flow (DCH)
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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.
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Common ID
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Authentication and Security Flow
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Authentication and Security Flow
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Call Setup Flow
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RAB Establishment Flow
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RAB Establishment Flow
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RRC Connection Release Flow (CCH)
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RRC Connection Release Flow (DCH)
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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
Paging
RRC and NAS signaling Connection Setup
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UE to UE CS Call Process (1)
RRC Con
Setu
NAS Sig
Setu
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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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PS Call Process
RR
N
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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 are
merged 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 (Intra-RNC)
Before Handover After Handover
SRNC
NodeBNodeB
SRNC
NodeBNodeB
SRNC
NodeBNodeB
During Handover
CNCN CN
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Soft Handover Flow
RNC (SRNC)
AirBridge AirBridge
AirBridge AirBridge
AirBridge AirBridge
Core NetworkCore Network
Node B
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Soft Handover Flow
RNC (SRNC)
AirBridge AirBridge
AirBridge AirBridge
AirBridge AirBridge
Merged in NodeB
Core NetworkCore Network
Node B
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Soft Handover Flow
Merged in RNC
RNC (SRNC)
AirBridge AirBridge
AirBridge AirBridge
AirBridge AirBridge
Core NetworkCore Network
Node B
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Soft Handover Flow (SRNC-DRNC)
Merged in SRNC
Node B
AirBridge AirBridge
AirBridge AirBridge
AirBridge AirBridge
Serving RNC
Drift RNC
Core NetworkCore Network
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Soft Handover Flow (SRNC Relocation)
Node B
AirBridge AirBridge
AirBridge AirBridge
AirBridge AirBridge
Serving RNC
RNC
Core NetworkCore Network
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Typical Soft Handover Flow (L3 Signaling)
Soft handover is triggered by 1A/1B/1C or 1D event
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Soft Handover Flow (Add Branch in AS)
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Soft Handover Flow (Del Branch from AS)
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Hard Handover
Before Handover After Handover
Radio Link can not exist simultaneously
SRNC
NodeBNodeB
SRNC
NodeBNodeB
CNCN
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Intra-Frequency Hard Handover
Intra-Frequency hard handover is triggered by 1D event
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Inter-frequency Handover
UE
CS Domain Inter RAT Handover Flow
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CS Domain Inter-RAT Handover Flow
(UMTS->GSM)
PS Domain Inter RAT Handover Flow (UMTS
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PS Domain Inter-RAT Handover Flow (UMTS-
>GSM & UE in CELL_FACH, CELL_PCH or
URA_PCH)
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PS Domain Inter-RAT Handover Flow
(UMTS->GSM & UE in CELL_DCH)
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Inter-RAT Handover Flow (GSM->UMTS)
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