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8/3/2019 03-WCDMA UTRAN Signaling Procedure
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Internal
www.huawei.com
WCDMA UTRAN Signaling
Procedure
Wireless Case and Training Department
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After this course, you will be able to:
Understand the definitions about UTRANnetwork elements
Understand UTRAN signaling procedure
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Chapter 1 Basic Concepts about UTRAN
Chapter 2 UTRAN Signaling Procedure
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RNL Control Plane Application Protocol
Node B
RNC
CN
UE
RANAP
NBAP
RNSAP RRC
NBAP Node B Application PartRANAP Radio Access Network Application PartRNSAP Radio Network Subsystem Application PartRRC Radio Resource Control
RNC
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RAB, RB and RL
UTRAN, RAB RB RL
RAB Qos
RB
RLNodeB
RNC CNUE
UTRAN
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UE Working Modes and States
Idle Mode
Connected Mode
CELL_DCH
CELL_FACHCELL_PCH
URA_PCH
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Idle Mode
The UE has no relation to UTRAN, only to CN. For data transfer, asignaling 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 pagingThe 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 modeThe 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-DCHIn active state
Communicating via its dedicated channels
UTRAN knows which cell UE stays in
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Connected Mode
Cell-FACHIn active state
Few data to be transmitted both in uplink and in downlink. There is noneed to allocate dedicated channel for this UE
Downlink uses FACH and uplink uses RACHUE 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 inUTRAN has to update cell information of UE when UEroams to another cell
Lower the power consumption of UE
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Connected Mode
URA-PCHNo 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
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CRNC
The CRNC owns the radio resources of a cell
Dynamical control of power for dedicated channels, within limits admitted byCRNC, is done by the SRNC.
Scheduling of data for dedicated channels is done by the SRNC, while forcommon channels it is done by the CRNC
Iub
Node B
Cell Cell Cell
Node B
...
Iu
CRNC
CN
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Chapter 1 Basic Concepts about UTRAN
Chapter 2 UTRAN Signaling Procedure
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Chapter 2 UTRAN Signaling Procedure
Section1 Call Overall Procedures
Section2 Cell Setup
Section3 System information broadcasting
Section3 UE Registration
Section4 Paging
Section5 Call Process
Section6 Handover
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Call Overall ProceduresNetwork side Start
1 Initialize equipment 2 Process system
broadcast
Step 1
Handset Power on
1 cell reselection
2 Location registration
3 Waiting for call
Step 2
Paging UE Step 3
RRC connection
Establish
Step 4
NAS signaling
connection establish
Step 5
RAB set up
1 synchronous set up
2 asynchronous set up
Step 6RAB/RB
modification
Step 6Transport channel
reconfiguration
Step 6Physical channel
reconfiguration
Step 6
Soft/hard
handover
Step 6
URA update
Step 6
Cell update
Step 6Handover with GSM
Step 7
RRC connection
release
Step 8
Waiting for call again
1 cell selection
2 wait for call
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Chapter 2 UTRAN Signaling Procedure
Section1 Call Overall Procedures
Section2 Cell Setup
Section3 System information broadcasting
Section4 UE Registration
Section5 Paging
Section6 Call Process
Section7 Handover
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Cell Setup Flow
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Cell Setup Signaling Analysis
Audit request
• The NodeB performs theresource status indicationprocedure to report its physicalresources to the Control RNC
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Cell Setup Signaling Analysis
Cell setup
The following parameters will be take to NODEB
After receiving the AUDIT RESPONSEmessage from the NodeB RNC sends
a CELL SETUP REQUEST message tothe NodeB Whether the conditions ofcell setup are fulfilled depends on thefollowing local cell information
reported by the NodeB:
Downlink power range
Minimum spreading factor
HSDPA cell capability of the NodeB
High Speed Downlink SharedChannel (HS-DSCH) resourceinformation, which is used to set up
an HSDPA cell
Common transport channel andphysical channel information
CCP and NCP information
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Cell Setup Signaling Analysis
Common transport channel setup (1) The common transport channel setup
procedure is performed to establish thenecessary resources in the NodeB,regarding the following channels:,PRACH, AICH, and RACH
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Cell Setup Signaling Analysis
Common transport channel setup (2)The common transport channel setupprocedure is performed to establish the
necessary resources in the NodeB,regarding the following channels: S-CCPCH, PICH, FACH, PCH.
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Cell Setup Signaling Analysis
System information update
The system information updateprocedure is performed for the NodeBto schedule and update the systeminformation segments, which arebroadcast on the Broadcast Channel
(BCH), according to the parameters inthe SYSTEM INFORMATION UPDATEREQUEST message.
If the system information is updated,the NodeB sends a SYSTEMINFORMATION UPDATE RESPONSE
message.
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Cell Setup Signaling Analysis
Physical shared channel reconfiguration
The physical shared channelreconfiguration procedure is performed forthe NodeB to reconfigure the physicalchannels according to the PHYSICALSHARED CHANNEL RECONFIGURATIONREQUEST message sent from the CRNC.
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Chapter 2 UTRAN Signaling Procedure
Section1 Call Overall Procedures
Section2 Cell Setup
Section3 System information broadcasting
Section4 UE Registration
Section5 PagingSection6 Call Process
Section7 Handover
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.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
System Information Broadcasting 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 UESIB2: 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 timerSIB8: 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: 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 Analysis (1)
MIB consist of PLMN ID and SB (scheduleblock)/SIB (system info block)
MIB ValueTag:
PLMN Identity : PLMN ID
SEG_COUNT
SIB_REP
SIB_POS
SIB_OFF
The MIB Scheduling information is fixedSIB-POS = 0 SIB-COUNT = 1 SIB-REP =
8
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System Information Analysis (3)
System info type 1
The NAS system information
CS domain DRX: K=6, then DRX period is2^k= 2^6= 64TTI=640 ms
PS domain DRX: K=6, then DRX period is2^k=2^6=64TTI =640 ms
Timers and counter for UEin connectionmode and timers for UE in idle mode
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System Information Analysis (5)
System info type 3 include cell selectand reselect parameters
CellIdentity
CellSelectReselectInfo information
CellAccessRestriction infromation
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Chapter 2 UTRAN Signaling Procedure
Section1 Call Overall Procedures
Section2 Cell Setup
Section3 System information broadcasting
Section4 UE Registration Flow
Section5 PagingSection6 Call Process
Section7 Handover
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The Overall Of UE Registration Flow
UE Registration Flow
Step 1UE Power on1.Camp on cell2.Read System information
Step 2RRC connection setup
Step 3
NAS signaling setup
Step 4
IU interface transport setup
Step
UE become to IdleStep5
RRC connection release
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When the SRNC receives an RRC CONNECTION REQUEST message from the UE, the RadioResource Management (RRM) module of the RNC determines whether to accept or reject theRRC connection request, based on a specific algorithm. If accepting the request, the RRM modulefurther determines whether to set up the RRC connection on a Dedicated Channel (DCH) or on aCommon Channel (CCH), based on a specific RRM algorithm. Typically, an RRC connection is set
up on the DCH.
UE SRNC RRC: RRC CONNECTION REQUEST
RRC: RRC CONNECTION SETUP
RRC: RRC CONNECTION SETUPCOMPLETE
NodeB
RL SETUP REQUEST
RL SETUP RESPONSE
ALCAP Establish
RRC CONNECTION SETUP (DCH)
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RRC CONNECTION REQUEST
The UE sends an RRCCONNECTION REQUESTmessage to the SRNC throughthe uplink CCCH, requestingthe establishment of an RRC
connection In this message consists ofIMSI or TMSI/PTMSI, LAIinformation andestablishment cause:registration or MOC or MTCand so on;
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RRC CONNECTION SETUP
This message take the RNTIIdentity to the UE
This message also take theRRC State indicator of theUE (CELL FACH)
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RRC CONNECTION SETUP COMPLETE
UE report the Capabilityinformation to RNC whichconsists of security capabilityphysical layer and L2 capabilityand so on;
ue RadioAccessCapability
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UE SRNC CN
RRC£ º INITIAL DIRECT TRANSFER
RANAP: INITIAL UE MESSAGE
RRC£ º DT
RANAP£ º DT
RANAP£ º DT
RRC£ º DT
The DT message between the UE and CN such as encryption
and identity confirm connection setup location update etc
NAS Signaling Connection Setup
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INITIAL UE MESSAGE
CN domaininformation
MM message hereare locationupdating request
UE imsi number
PLMN ID andRNC ID reportto CN ;
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DIRECT TRANSFER
The message contains theNon Access Stratum (NAS)information to be sent to the
CN by the UE
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After UE registration all of the resource will be release
include RL resource Iub interface transport bearer
resource
RRC Release Flow
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IU RELEASE COMMAND
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Chapter 2 UTRAN Signaling Procedure
Section1 Call Overall Procedure
Section2 Cell Setup
Section3 System information broadcasting
Section4 UE Registration
Section5 Paging Section6 Call Process
Section7 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
Paging type
If UE is in CELL_FACH or CELL_DCH mode UTRAN
initiated paging type is paging typ2;If UE is in CELL_PCH,URA_PCH or idle mode, UTRANinitiated paging type is paging typ1;
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The Flow of CN Initiated Paging
PS Paging Without RRC Connection for CS
SGSNUE NodeB1 RNC 1
RANAP
NodeB2 RNC 2
RANAP
MSC / VLR
RANAP
RANAPPaging
PagingRRC
RRCPaging Type 1RRC
Paging Type 1
UE RNC 1
RANAP
MSC / VLR
RANAPPaging
SGSN
PS Paging With RRC Connection for CS
RRC Connection Establish
NodeB1
RRCPaging Type 2RRC
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CN Initiated Paging Message Analysis
Paging UE IMSI
paging Cause
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Paging Type2 Message Analysis
UE in CELL_DCH orCELL_FACH The paging
information bearer on DCCH
DCCH for paging
Paging Cause andinformation of the cndomain
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UTRAN
PCCH for paging
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Chapter 2 UTRAN Signaling Procedure
Section1 Call Overall Procedures
Section2 Cell Setup
Section3 System information broadcasting
Section4 UE Registration Flow
Section5 PagingSection6 Call Process
Section7 Handover
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Call Process Flow Analysis
Call Process Flow Analysis as following annex
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Chapter 2 UTRAN Signaling Procedure
Section1 Call Overall Procedures
Section2 Cell Setup
Section3 System information broadcasting
Section4 UE Registration Flow
Section5 PagingSection6 Call Process
Section4 UE handover signaling flow
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Concepts about Soft Handover
Soft handover: the signals from different NodeBs are mergedin RNC
Softer handover: the signals from different cells, but from thesame NodeB are merged in NodeB
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Soft Handover Flow (Intra-RNC)
Before Handover After Handover
SRNC
NodeB NodeB
SRNC
NodeB NodeB
SRNC
NodeB NodeB
During Handover
CN CN CN
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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 (SRNC-DRNC)
Merged in SRNC
Node B
AirBridge
AirBridge
AirBridge
Serving RNC
Drift RNC
Core Network
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Soft Handover Flow (SRNC Relocation)
Node B
AirBridge
AirBridge
AirBridge
Serving RNC
RNC
Core Network
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Typical Soft Handover Flow (L3 Signaling)
Soft handover is triggered by 1A/1B/1C or 1D event
Measurement Report (1A/1B/1C or 1D)
Measurement Control
RRC Connection Setup Procedure
RNCUE
Active Set Update
Active Set Update Complete
Measurement Control
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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 tosetup new RL
RL Setup Rsp.
DL SynchronizationDL 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 tosetup new RL
Measurement Report (1D)
I f H d
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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)
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Inter-RAT Handover Flow (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 to
handover to GSM
Measurement Control (2D & 2F)
Relocation Required
3G MSC3G MSC
Prepare Handover
BSC
Handover Request
Handover Request ACKPrepare Handover
ResponseRelocation Command
Inter-System Handover Command
Handover Complete
Handover CompltetSend END
Signal RequestIu Release Command
Iu Release Complete
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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 RequesetPrepare Handover
Handover Request
Handover Command
Send End SignalRequest
Inter-System to UTRAN Handover Command
Clear command
Clear complete
UTRAN Capacity Info Confirm
UE Capacity Info Confirm
Relocation RequesetACK
Prepare Handover RSP
Relocation Complete
Send end signalresponseUE Capacity Info
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