wcdma utran interface and signaling procedure issue 11
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WCDMA UTRANInterface andSignalingProcedure
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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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Contents
1. UTRAN Network Overview
2. Basic Concepts about UTRAN
3. UTRAN Signaling Procedure
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The Position of UTRAN in WCDMANetwork
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UMTS Construction
UTRAN UMTS Terrestrial Radio Access NetworkCN Core NetworkUE User Equipment
Iu
UTRAN
UEUu
CN
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UMTS Structure
RNS
RNC
RNS
RNC
Core Network
Node B Node B Node B Node B
Iu Iu
Iur
Iub IubIub Iub
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Uu Interface
L3
contro
l
contro
l
contro
l
LogicalChannels
TransportChannels
C-plane signalling U-plane information
PHY
L2/MAC
L1
RLC
DCNtGC
L2/RLC
MAC
RLCRLCRLC
RLC
RLCRLC
RLC
Duplication avoidance
UuS boundary
BMC L2/BMC
control
PDCPPDCP L2/PDCP
DCNtGC
RadioBearers
RRC
contro
l
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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)
TransportNetwork
Layer
Physical Layer
SignallingBearer(s)
TransportUser
NetworkPlane
Control Plane User Plane
TransportUser
NetworkPlane
Transport NetworkControl Plane
RadioNetwork
Layer
SignallingBearer(s)
DataBearer(s)
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RNL Control Plane ApplicationProtocol
NBAPNode B Application PartRANAPRadio Access Network Application PartRNSAPRadio Network Subsystem Application PartRRC Radio Resource Control
Node B
RNC
CN
UE
RANAP
NBAP
RNSAPRRCRNC
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Iu-CS Interface
Q.2150.1
Q.2630.1
RANAPIu UP Protocol
Layer
TransportNetwork
Layer
Transport NetworkUser Plane
Control Plane User Plane
Transport NetworkUser Plane
Transport NetworkControl Plane
RadioNetwork
Layer
SSCOP
AAL5
SSCOP
SSCF-NNI
AAL2AAL5
MTP3bMTP3b
SCCP
SSCF-NNI
Physical Layer
ATM
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Iu-PS Interface
SSCF-NNI
SSCOP
AAL5
IP
SCTP
SCCP
SSCF-NNI
MTP3-B
M3UA
Physical Layer
Control Plane User Plane
ATM
AAL5
IP
UDP
GTP-U
Physical Layer
ATM
Transport
Network
Layer
Transport NetworkControl Plane
Radio
Network
Layer
RANAP Iu UP ProtocolLayer
Transport NetworkUser Plane
Transport NetworkUser Plane
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Iub Interface
Node BApplication Part
(NBAP)
AAL Type 2
ALCAP
TransportLayer
RadioNetwork
Layer
Radio NetworkControl Plane
TransportNetwork
Control Plane
DCHFP
RACHFP
ATM
DSCHFP
AAL Type 5
User Plane
SSCF-UNI
SSCOP
AAL Type 5
SSCF-UNI
SSCOP
Q.2630.1
Q.2150.2
FACHFP
PCHFP
USCHFP
CPCHFP
Physical Layer
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Iur Interface
SSCF-NNI
SSCOP
MTP3-B
AAL5
IP
SCTP
SCCP
AAL5
STC (Q.2150.1)
RNSAPIur Data
Stream(s)
Physical Layer
Control Plane User Plane
ATM
ALCAP(Q.2630.1)
AAL2
SSCF-NNI
SSCOP
MTP3-B
IP
SCTP
M3UAM3UA
Transport
Network
Layer
Transport NetworkControl Plane
Radio
NetworkLayer
Transport NetworkUser Plane
Transport NetworkUser Plane
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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 on a per connection basis between a UE and the
UTRAN
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
IuIur
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CRNC
The CRNC owns the radio resources of a cell
Dynamical control of power for dedicated channels, within limits admittedby CRNC, is done by the SRNC.
Scheduling of data for dedicated channels is done by the SRNC, while for
common channels it is done by the CRNC
Iub
Node B
Cell Cell Cell
Node B
...
Iu
CRNC
CN
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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, asignalling connection has to be established.
UE camps on a cell
It enables the UE to receive system information from the PLMN
When registered and if the UE wishes to establish an RRC connection, it can
do this by initially accessing the network on the control channel of the cell on
which it is camped
UE can receive "paging" message from control channels of the cell.
It enables the UE to receive cell broadcast services.
The idle mode tasks can be subdivided into three processes: PLMN selection and reselection;
Cell selection and reselection;
Location registration.
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Connected Mode
When at least one signalling connection exists, the UE is in
connected mode and there is normally an RRC connection
between UE and UTRAN. The UE position can be known on
different levels:
UTRAN Registration Area (URA) level
The UE position is known on URA level. The URA is a set of cells
Cell level
The UE position is known on cell level. Different transport channel
types can be used for data transfer:
Common transport channels (RACH / FACH, DSCH, CPCH)
Dedicated transport channels (DCH)
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Connected Mode
Cell-DCH
In active state
Communicating via its dedicated channels
UTRAN knows which cell UE is 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 need to monitor the FACH for its relative information.
UTRAN knows which cell UE is in.
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Connected Mode
Cell-PCH
No data to be transmitted or received.
Monitor PICH, to receive its paging.
lower the power consumption of UE.
UTRAN knows which cell UE is in.
UTRAN have to update cell information of UE when UE roams
to another cell
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Connected Mode
URA-PCH
No data to be transmitted or received.
Monitor PICH.
UTRAN only knows which URA (UTRAN Registration Area,
which consists of multiple cells) that UE is in.
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 States
CELL_DCH CELL_FACH
CELL_PCHURA_PCH
IDLE
DEAD - Scanning networks (PLMN)- Camp on cell
- Monitor paging channel
- cell re-selection
- Dedicated Channel- Radio bearers Transmission Services
- upper layer Signalingtrigger (CN)
- Reduce actionDTXand save power
RRC connection
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RNTI - Radio Network TemporaryIdentifier Five Types of RNTI exist
Serving RNC RNTI (S-RNTI)
Drift RNC RNTI (D-RNTI)
Cell RNTI (C-RNTI)
UTRAN RNTI (U-RNTI)
HS-DSCH RNTI (H-RNTI)
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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 Cell Setup
3.2 System Information Broadcast
3.3 Paging
3.4 Call Process
3.5 Handover
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Cell Setup
NBAP
NBAP
NBAP
NBAP
NBAP
NBAP
NBAP
NBAP
NBAP
NBAP
NCP: Resource Status Ind
NCP: Audit Req
NCP: Cell Setup Req
NCP: Cell Setup Rsp
NBAPNBAP NCP: Comm TrCh Setup Req
NBAPNBAP NCP: Comm TrCh Setup Rsp
Q.AAL2
Q.AAL2
Q.AAL2
Q.AAL2
Est Req
Est Conf
RNC NodeB
NCP: Audit Rsp
NBAPNBAP NCP: Comm TrCh Setup Req
NBAPNBAP NCP: Comm TrCh Setup Rsp
Q.AAL2
Q.AAL2
Q.AAL2
Q.AAL2
Est Req
Est Conf
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Contents
3. UTRAN Signaling Procedure
3.1 Cell Setup
3.2 System Information Broadcast
3.3 Paging
3.4 Call Process
3.5 Handover
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System Information BroadcastFlow
3.BCCH:System Information
1.System Information Update Request
UE Node B RNC CN
NBAPNBAP
RRCRRC
4.BCCH:System Information RRCRRC
5.BCCH:System Information RRCRRC
2.System Information Update Response
NBAPNBAP
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Introduction of System Information
MIBContains PLMN tag and SB (scheduling information block) or thescheduling information for SIB (system info block)
SB1Contains scheduling information for SIB
SB2Contains scheduling information for SIB
SIB1Contains the system information for NAS and the timer/counter for UE
SIB2
Contains the URA informationSIB3
Contains the parameters for cell selection and cell re-selection
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Introduction of System Information
SIB4Contains parameters for cell selection and cell re-selection while UE is inconnecting mode
SIB5Contains parameters for the common physical channels of the cell
SIB6Contains parameters for the common physical channels of the cell whileUE is in connecting mode
SIB7Contains the uplink interference level and the refreshing timer for SIB7
SIB8Contains the CPCH static information
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Introduction of System Information
SIB9Contains the CPCH dynamic information
SIB10Contains information to be used by UEs having their DCH controlled by aDRAC procedure
Used in FDD mode onlyTo be used in CELL_DCH state onlyChanges so often, its decoding is controlled by a timer
SIB11Contains measurement controlling information
SIB12Contains measurement controlling information in connecting mode
SIB13Contains ANSI-41 system information
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Introduction of System Information
SIB14:Contains the information in TDD mode
SIB15:Contains the position service information
SIB16:Contains the needed pre-configuration information for handover fromother RAT to UTRAN
SIB17:Contains the configuration information for TDD
SIB18:Contains the PLMN identities of the neighboring cellsTo 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 DRXK 6then
DRX period is 2^k = 2 ^ 6 = 64
TTI = 640 ms
PS domain DRXK 6then
DRX period is 2^k = 2 ^ 6 = 64
TTI = 640 ms
The different timers for UE inconnecting mode and idle mode.
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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 cellselection 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
PICH
AICH
PCCPCH PRACH
SCCPCH
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System Information Block Type 7and 11 System info type 7
Including the UL interference level which is used for open loop
power control:
Preamble_Initial_Power=Primary CPICH DL TX power -
CPICH_RSCP + UL interference + Constant Value
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 Cell Setup
3.2 System Information Broadcast
3.3 Paging
3.4 Call Process
3.5 Handover
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Paging Caused by CN
The paging information type which is sent by UTRAN is
decided by UE mode.
If UE is in the CELL_FACH or CELL_DCHUTRAN send
paging type 2. In other modes, the paging information istype 1 and UE can use DTX method to detecting PICH.
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Paging Caused by UTRAN
UE RNC1NodeB1
RRCPagingType1RRC
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Contents
3. UTRAN Signaling Procedure
3.1 Cell Setup
3.2 System Information Broadcast
3.3 Paging
3.4 Call Process
3.5 Handover
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Introduction of Call Process
In WCDMA system, a call process includes the following basicsignaling flows:
RRC connection flow
Iu interface signaling flow
Authentication flow (optional) Security flow (optional)
RAB establish flow
Call proceeding
NAS signaling before correlative bearer release
Correlative bearer release
RRC Connection Establishment Flow
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RRC Connection Establishment Flow(DCH)
When UE is in IDLE mode and the NAS of UE request the signaling connection, UE will send a RRC Connection
Request. Each UE only can have on RRC Connection. The main function is to configure the signaling channel of
UTRAN.
1. CCCH: RRC Connection Request
5. Downlink Synchronisation
UE
Node B
Serving RNS
Serving
RNC
DCH - FP
Allocate RNTISelect L1 and L2parameters
RRCRRC
NBAPNBAP
3. Radio Link Setup Response
NBAPNBAP2. Radio Link Setup Request
RRCRRC7. CCCH: RRC Connection Set up
Start RXdescription
Start TXdescription
4. ALCAP Iub Data Transport Bearer Setup
RRCRRC9. DCCH: RRC Connection Setup Complete
6. Uplink Synchronisation
NBAPNBAP8. Radio Link Restore Indication
DCH - FP
DCH - FP
DCH - FP
I I t f Si li C ti
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Iu Interface Signaling ConnectionEstablish
In Iu interface, radio network layer reports the
RANAP information and NAS information. NAS
information is taken as directed message in RANAP
information.
And the process of Iu signaling connection is to
establish the Iu interface connection of SCCP
between RNC and CN.
UE Node B RNC CN
RRC RRC
SCCP SCCP
SCCP SCCP
Initial DT
Initial UE message (ConnectRequest)
Connect Confirm
RANAP
Transport NetworkUser Plane
Control Plane
SSCOP
AAL5
MTP3b
SCCP
SSCF-NNI
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Authentication and Security FlowUE RNC CN
RRC Connection Setup
Initial DTInitial UE Message
DL DT (Authentication
Request)DL DT (AuthenticationRequest)
DL DT (AuthenticationRequest) DL DT (Authentication
Request)
Common ID
Security Mode CommandSecurity Mode Command
Security Mode Command
Security Mode Command
RAB Assignment
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Common ID
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RAB Establishment FlowNodeBUE CNRNC
RANAPRANAPRAB Ass Req
Q.AAL2 Q.AAL2
Q.AAL2Q.AAL2
NBAPNBAP
AAL2 Setup Req
RL Recfg Prep
AAL2 Setup Rep
NBAPNBAPRL Recfg Ready
Q.AAL2Q.AAL2AAL2 Setup Req
Q.AAL2Q.AAL2AAL2 Setup Rep
FPFPDL Sync
FPFPUL Sync
RRC RRCRB Setup
NBAPNBAPRL Recfg Commit
RRC RRCRB Setup Complete
RANAPRANAPRAB Ass Rep
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NAS Signaling (CS)
UE Terminating Call
UE MSC
CM Service Request
RRC and NAS signaling Connection Setup
Authentication Request
Authentication Response
Security Mode Command
Security Mode Command
RAB Assignment
Setup
Call Proceeding
Alerting
Connect
Connect ACKDisconnect
Release
Release Complete
UE Outgoing Call
UE MSC
Paging Response
Authentication Request
Authentication Response
Security Mode Command
Security Mode Command
RAB Assignment
Setup
Call Confirmed
Alerting
Connect
Connect ACK
Disconnect
Release
Release Complete
Paging
RRC and NAS signaling Connection Setup
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NAS Signaling (PS)UE MSC
CM Service Accept
Service Request
RRC
Activate PDP Context Req
Activate PDP Context Accept
RAB
Deactivate PDP Context Req
Deactivate PDP Context Accept
UE Outgoing Call
UE MSC
Service Request
RRC
Request PDP Context Activation
Activate PDP Context Req
RAB
UE Terminating Call
Paging
Authenticate and ciphering Req
Authenticate and ciphering Rsp Authenticate and ciphering Req
Authenticate and ciphering Rsp
Activate PDP Context Accept
Deactivate PDP Context Req
Deactivate PDP Context Accept
SGSN SGSN
RRC connection and NAS signalingconnection establishment RRC connection and NAS signaling
connection establishment
Security Mode
Security Mode
RAB establishment
RAB establishment
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UE to UE (1)Ori UE Ter UENodeB1 NodeB2RNC1 CN RNC2
1.RRC Connect Setup Req
2.RL Setup Req
3.RL Setup Rsp
4.AAL2 Setup Req
5.AAL2 Setup Rsp
6.DL Sync
7.UL Sync
8.RRC Connect Setup
9.RRC Connect Setup Cmp
10.Initial DT
11.InitUE(CM
ServiceReq)
12.DT(AuthenticaReq)
15.DT(Authentica
Rsp)
13.DL DT
14.UL DT
RANAP
RRCRRC
NBAPNBAP
NBAPNBAP
Q.AAL2Q.AAL2
Q.AAL2Q.AAL2
FPFP
FPFP
RRCRRC
RRCRRC
RRCRRC
RANAP
RANAP RANAP
RRC RRC
RRCRRC
RANAP RANAP
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UE to UE (5)Ori UE Ter UENodeB1 NodeB2RNC1 CN RNC2
RANAP RANAP64.RAB Ass Req
NBAPNBAP
70.RL Recfg
ReadyNBAPNBAP
69.RL RecfgPrep
Q.AAL2 Q.AAL2
72.AAL2
Setup RspQ.AAL2 Q.AAL2
71.AAL2
Setup Req
FPFP 73.DL Sync
FPFP 74.UL Sync
RRC RRC75.RB Setup
Q.AAL2 Q.AAL265.AAL2 Setup
Req
Q.AAL2 Q.AAL266.AAL2 Setup
ConfFPFP 67.DL Sync
FPFP 68.UL Sync
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UE to UE (6)Ori UE Ter UENodeB1 NodeB2RNC1 CN RNC2
NBAPNBAP76.RL Rcfg
Commit
RRC RRC77.RB Setup Complete
RANAP RANAP78.RAB Ass
Rsp
RRC RRC79.UL DT
RANAP RANAP80.DT(Alerti
ng)
RANAP RANAP81.DT(Alerting)
RRC RRC82.DL DT
RRC RRC83.UL DT
RANAP RANAP84.DT(Connec
t)
RANAP RANAP85.DL
DT(Connect)
RRC RRC86.DL DT
RRC RRC87.UL DT
RANAP RANAP
RANAP RANAP
RRC RRC
88.UL DT
89.DT(Connec
t Ack)
90.DL DT
Alerting
Connect
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Contents
3. UTRAN Signaling Procedure
3.1 Cell Setup
3.2 System Information Broadcast
3.3 Paging
3.4 Call Process
3.5 Handover
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Concepts about Soft Handover
Soft handover: the signals from different NodeBs are merged inRNC.
Softer handover: the signals from different cells, but from the
same NodeB are merged in NodeB.
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Node B
RNC
AirBridge
AirBridge
AirBridge
Soft Handover Flow
Core Network
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Node B
RNC
AirBridge
AirBridge
AirBridge
Merged in NodeB
Soft Handover Flow
Core Network
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Merged in RNC
Node B
RNC
AirBridge
AirBridge
AirBridge
Soft Handover Flow
Core Network
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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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Before Handover After Handover
SRNC
NodeBNodeB
SRNC
NodeBNodeB
SRNC
NodeBNodeB
During Handover
Soft Handover FlowIntra-RNC
CNCN CN
Soft Handover FlowAdd Branch
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Decision to setupnew RL
7. DCCH : Active Set Update Complete
6.DCCH: Active Set Update
UE Node B(new) SRNC
NBAP1. Radio Link Setup RequestNBAP
NBAP
2. 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 RX description
RRC
RRC
RRC
RRC
Soft Handover FlowAdd Branchin RNC
Soft Handover FlowDel Branch
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Decision to deletea RL
2. DCCH : Active Set Update Complete
1.DCCH: Active Set Update
UE Node B(old) SRNC
NBAP3. Radio Link Deletion RequestNBAP
NBAP4. Radio Link Deletion ResponseNBAP
RRC
RRC
RRC
RRC
Stop RX and Tx
5 ALCAP Iub Transport Bearer release
Soft Handover FlowDel Branchin RNC
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Before Handover After Handover
Radio Link can not exist simultaneously
SRNC
NodeBNodeB
SRNC
NodeBNodeB
Hard Handover (Intra-RNC)
CNCN
C
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UE Node B Source Node B Target SRNC
8. DCCH : Physical Channel Reconfiguration Complete
6.DCCH : Physical Channel Reconfiguration
1. Radio Link Setup Request
2. Radio Link Setup Response
9. Radio Link Deletion Request
10. Radio Link Deletion Response
3 ALCAP ub Data Transport Bearer Setup
7. Radio Link Failure IndicationRRCRRC
NBAPNBAP
NBAP
RRCRRC
NBAP
NBAP
NBAP NBAP
Decide to
handover
Start Rx
Start Tx
DCH-FP4. Downlink SynchronisationDCH-FP
DCH-FP5.Uplink SynchronisationDCH-FP
NBAP
NBAP
NBAP
11. ALCAP Iub Data Transport Bearer Release
Hard Handover (Intra-RNC)
SRNC R l i
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SRNC Relocation
SRNS
Core Network
Iu
DRNSIur
UE
RNS
Core Network
Iu
SRNS
UE
After SRNS RelocationBefore SRNS Relocation
Cells
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Inter-System Handover Flow
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Inter-System Handover Flow
UMTS->GSMUE NodeB RNC 3G MSC 2G MSC BSS
Measurement Report(2D)
RL Recfg Prep
RL Recfg Ready
Physical Channel Reconfiguration
RL Recfg Commit
Physical Channel Reconfiguration cmp
Measurement Control(InterRAT)
Measurement Report(GSM)
Relocation Required
Relocation Command
Prepare Handover
Handover Request
Handover Request ACK
Prepare Handover RSP
Handover From UTRAN CMD
Handover Complete
IU release command
IU release complete
RRC Con Release Req
RRC Con Release Cmp
RL Del Req
RL Del Rsp
Inter-System Handover Flow
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Inter-System 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
requeset
Inter System to UTRAN Ho cmd (Handover to UTRAN 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
F d H d
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Forward Handover
Forward Handover is sponsored by UE, including cellupdate and URA update. URA update is only used to make
the URA re-selection for the UE which is in URA_PCH state,
and check the RRC connection.
S
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Summary
This chapter mainly explains the basic signaling flow inUTRAN. This is very helpful for the CN signaling flow.
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