W(Level1) UMTS UTRAN Signaling Procedures 20050614 a 1[1].0
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Transcript of W(Level1) UMTS UTRAN Signaling Procedures 20050614 a 1[1].0
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Wireless Curriculum Development Section
ISSUE
UMTS UTRAN Signaling Procedures
1.0
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Confidential Information of Huawei.
No Spreading without Permission. Security Level: Internal
Course Contents
Chapter 1 UTRAN Network Overview
Chapter 2 Basic Signaling Process
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Confidential Information of Huawei.
No Spreading without Permission. Security Level: Internal
UTRAN Overview
UE Working Mode and State
Serving RNCDrift RNC and Control RNC
Source RNC and Target RNC
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No Spreading without Permission. Security Level: Internal
UE Working Modes and states
Idle Mode
The UE has no relation to UTRAN, only to CN. For data transfer,
a signalling 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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No Spreading without Permission. Security Level: Internal
UE Working Modes and states
Connected Mode (Cell-DCH, Cell-FACH, Cell-PCH, URA-PCH)
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 ondifferent 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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No Spreading without Permission. Security Level: Internal
UE Working Modes and states
Cell-DCH
In active state
Communicating via its dedicated channels
UTRAN knows which cell UE is in.
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No Spreading without Permission. Security Level: Internal
Cell-FACH and Cell-PCH State
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.
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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No Spreading without Permission. Security Level: Internal
URA-PCH State
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 update UE information only after UE has roamed to
other URA.
A better way to lower the resource occupancy and signaling
transmission
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No Spreading without Permission. Security Level: Internal
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 Signaling
trigger (CN)
- Reduce actionDTXand save power
RRC connect ion
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No Spreading without Permission. Security Level: Internal
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 CRNC
Drift RNSs support the Serving RNS 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 DRNCIu Iur
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No Spreading without Permission. Security Level: Internal
CRNC
The CRNC owns the radio resources of a cell
Dynamical control of power for dedicated channels, within
limits admitted by 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
CRNC
Iub
Node B
Cell Cell Cell
Node B
...
CN
Iu
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No Spreading without Permission. Security Level: Internal
Source RNC/Target RNC
The SRNS Relocation function coordinates the activities when the
SRNS role is to be taken over by another RNS.
Source RNC is the SRNC before SRNs Relocation and Target
RNC is the SRNC after SRNs Relocation
CNCN
Source
RNCTarget
RNC
Serving
RNC
Iu Iu
Iur RNC
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No Spreading without Permission. Security Level: Internal
Course Contents
Chapter 1 UTRAN Network Overview
Chapter 2 Basic Signaling Process
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No Spreading without Permission. Security Level: Internal
Basic Signaling Procedures
2.1 Call overall process
2.2 Network start process
2.3 UE registration process
2.4 Call process
2.5 Connection mobility management process
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No Spreading without Permission. Security Level: Internal
Call overall Procedures
Network side Start
1Initialize equipment2Process system
broadcast
Step 1
Handset Power on
1cell reselection2
Location registration3Waiting for call
Step 2
Paging UE
Step 3
RRC connection
Establish
Step 4
NAS signaling
connection establish
Step 5
RAB set up
1synchronous set up2asynchronous set up
Step 6
RAB/RB modification
Step 6
Transport channel
reconfiguration
Step 6
Physical channel
reconfiguration
Step 6
Soft/hard handover
Step 6
URA update
Step 6
Cell update
Step 6
Handover with GSM
Step 7
RRC connection
release
Step 8
Waiting for call again
1cell selection2wait for call
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No Spreading without Permission. Security Level: Internal
Basic Signaling Procedures
2.1 Call overall process
2.2 Network start process
2.3 UE registration process
2.4 Call process
2.5 Connection mobility management process
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No Spreading without Permission. Security Level: Internal
System Information Broadcast Flow
.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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No Spreading without Permission. Security Level: Internal
Basic Signaling Procedures
2.1 Call overall process
2.2 Network start process
2.3 UE registration process
2.4 Call process
2.5 Connection mobility management process
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No Spreading without Permission. Security Level: Internal
RRC Connection Establishment Flow(CCH)
UE SRNC
RRC: RRC CONNECTION REQUEST
RRC: RRC CONNECTION SETUP
RRC: RRC CONNECTION SETUP COMPLETE
NodeB
UE originate RRC connection setup for registration.
SRNC decides to establish RRC connection on common channel,
and uses pre-configured common channel resources.
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No Spreading without Permission. Security Level: Internal
NAS Signaling Establishment Flow
UE SRNC CN
RRC INITIAL DIRECT TRANSFER
RANAP: INITIAL UE MESSAGE
RRC DTRANAP DT
RANAP DT
RRC DT
UE changes DT messages with CN, such as Authentication,
connection establishment, location registration, etc.
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No Spreading without Permission. Security Level: Internal
RRC Connection Release Flow(CCH)
UE NodeB SRNC
IU RELEASE COMMAND
IU RELEASE COMPLETE
RRC RRC CONNECTION RELEASE
RRC RRC CONNECTION RELEASE COMPLETE
CN
In registration process, UE does not use dedicated user plane resources.
Instead, it release signaling link directly. Thus registration procedure ends.
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No Spreading without Permission. Security Level: Internal
Basic Signaling Procedures
2.1 Call overall process
2.2 Network start process
2.3 UE registration process
2.4 Call process
2.5 Connection mobility management process
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No Spreading without Permission. Security Level: Internal
Paging Flow (UE in Idle State or PCH State)
CNSRNCUE
RANAP PAGING
RRC PAGING TYPE 1
CN sends paging message and specifies UE and paging area.CN is
responsible for paging message re-send. SRNC sends relevant paging
message according to UE state.
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No Spreading without Permission. Security Level: Internal
Paging Flow (connection mode)
CN sends paging message and specifies UE and paging area.CN is
responsible for paging message re-send. SRNC sends relevant paging
message according to UE state.
UE Serving
RNC
CN
RRCRRC2. DCCH: Paging
RANAP RANAP1. Paging
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No Spreading without Permission. Security Level: Internal
RRC Connection Establishment Flow(DCH)
5. Downlink Synchronisation
U E N od e B
Serving RNSServing
RN C
DCH-FPD CH -F P
Allocate RNT I
Select L1 and L2
pa ra m et er s
R RCRRC1. CCCH : RRC C onnection Request
N B A PN B A P
3. Radio L ink Setup R esponse
N B A PN B A P
2. Radio L ink Setup Reques t
RRCR RC7. CCCH : RRC C onnection Setup
Start RX
Start TX
4. ALCAP Iub Data Transport Bearer Setup
R RCRRC9. D C CH : RRC Connection Setup Complete
D CH -F PD CH -F P6. Uplink Synchronisation
N B A PN B A P
8. Radio Link Restore Indication
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No Spreading without Permission. Security Level: Internal
NAS Signalling Connection Establishment
The NAS signalling connection between UE and CN can now be
used for NAS message transfer
UE ServingRNC
CN
1. RRC Connection Establishment
RRC
RRC2.DCCH: Initial Direct Transfer
RANAP RANAP3. Initial UE Message
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RAB Establish Flow(DCH-DCH, asynchronous)
UE SRNCNodeB CNRAB ASSIGNMENT REQUEST
ALCAP Establish
RL RECONFIG REQ
RL RECONFIG RESP
ALCAP Establish, synchronization
RRCRB SETUP
RRCRB SETUP COMPLETE
RAB ASSIGNMENT RESPONSE
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No Spreading without Permission. Security Level: Internal
Transport Channel Reconfig Flow(Synchronised)
UE NodeB SRNC
RL RECONFIG PREPARE
RL RECONFIG READY
RL RECONFIG COMMIT
TRANSPORT CHANNEL RECONFIG
TRANSPORT CHANNEL RECONFIG COMPLETE
ALCAP Establish, synchronization
ALCAP Release
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No Spreading without Permission. Security Level: Internal
Physical Channel Reconfig Flow
UE NodeB SRNC
RL RECONFIG PREPARE
RL RECONFIG READY
RL RECONFIG COMMIT
PHYSICAL CHANNEL RECONFIG
PHYSICAL CHANNEL RECONFIG COMPLETE
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No Spreading without Permission. Security Level: Internal
RRC Release FlowDCHUE NodeB SRNC CN
IU RELEASE COMMAND
IU RELEASE COMPLETE
ALCAP ReleaseRRCRRC CONNECTION RELEASE
RRCRRC CONNECTION RELEASE COMPLETE
RL DELETION
RL DELETION RESPONSE
ALCAP Release
Release procedure is usually originated by CN. But if UE is faulty,
SRNC can also request release.
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No Spreading without Permission. Security Level: Internal
Basic Signaling Procedures
2.1 Call overall process
2.2 Network start process
2.3 UE registration process
2.4 Call process
2.5 Connection mobility management process
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No Spreading without Permission. Security Level: Internal
Soft Handover
Macro diversity is a operation state in which a User
Equipment simultaneously has radio links with two or more
UTRAN access points. The aim is to improve quality of the
radio connection or provide seamless connection.
Active Set is a set of radio links simultaneously involved in a
specific communication service between an UE and a
UTRAN access point.
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Soft Handover Illustration (Intra RNC)
Before Soft Handover After Soft Handover
CN
SRNC
NodeBNodeB
CN
SRNC
NodeBNodeB
CN
SRNC
NodeBNodeB
During Soft Handover
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Soft Handover Illustration (Inter-RNC)
Before Soft Handover After Soft Handover
Radio Link(RL) is added and deleted simultaneously
CN
SRNC RNC
NodeB NodeBNodeB
CN
SRNC RNC
NodeB NodeBNodeB
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No Spreading without Permission. Security Level: Internal
Soft Handover - Radio Link AdditionU E N od e B
D ri ft RN S
Drift
RNC
Serving
RN C
DCH-FPDCH-FP8. D ownlink Synchronisation
RNSAP RNSAP
1. Radio Link Setup
Request
Start TX
N BA P NB AP
2. Radio Link Setup
Request
RNSAP RNSAP
4. Radio Link Setup Response
N B AP N BAP
3. Radio Link Setup
Response
Start RX
Decision to setup
new RL
RRCRRC11. D CC H : Active Set Update Com plete
RRCRRC
10. D CCH : Active Set Update
[Radio Link Add ition]
ALCAP Iur B earer Setup5. ALCAP Iub Bearer Setup
DCH-FPDCH-FP9. Uplink Synchronisation
RNSAP RNSAP
7. Radio Link Restore
Indication
N B AP NB AP
6. Radio Link Restore
Indication
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No Spreading without Permission. Security Level: Internal
Soft Handover - Radio Link Deletion
UE Node B
Drift RNS
Drift
RNC
Serving
RNC
RRCRRC2.DCCH: Active Set Update Complete
Decision to delete
old RL
RNSAP RNSAP
3. Radio Link DeletionRequest
NBAP NBAP
4. Radio Link Deletion
Request
RNSAP RNSAP6. Radio Link DeletionResponse
NBAP NBAP
5. Radio Link Deletion
Response
Stop RX and TX
RRCRRC
1.DCCH: Active Set Update
[Radio Link Deletion]
ALCAP Iur Bearer Release7. ALCAP Iub Bearer Release
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Hard Handover Illustration (Intra-RNC)
Before Har Handover 7 After Hard Handover
Radio Link(RL)cannot exist simultaneously
CN
SRNC
NodeBNodeB
CN
SRNC
NodeBNodeB
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Hard Handover Illustration (Inter-RNC)
Before Hard Handover After Hard Handover
Radio Link(RL)cant exist simultaneously
CN
SRNC RNC
NodeBNodeB
CN
SRNC RNC
NodeBNodeB
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RNSAPRNSAP1. Radio Link Setup Request
UE Node B
Source
Node B
Target
RNC
Source
RNC
Target
SRNC
RRCRRC
10. DCCH : Physical Channel Reconfiguration Complete
RRC7.DCCH : Physical Channel Reconfiguration
RRC
6. ALCAP Iur Data Transport Bearer Setup
NBAP NBAP2. Radio Link Setup Request
NBAP NBAP3. Radio Link Setup Response
NBAP NBAP
12. Radio Link Deletion Request
NBAP NBAP13. Radio Link Deletion Response
4. ALCAP ub Data Transport Bearer Setup
14. ALCAP Iub Data Transport Bearer Release
RNSAP RNSAP15. Radio Link Deletion Response
16. ALCAP Iur Data Transport Bearer Release
RNSAP
5. RL Setup Response
RNSAP
RNSAP11. Radio Link Deletion Request
RNSAP
NBAP NBAP8. Radio Link Failure Indication
RNSAPRNSAP
9. Radio Link Failure Indication
Hard Handover via Iur (DCH on Iur)
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Hard Handover FlowUMTS->GSM
MAP/E MAP/E
2. Prepare
Handover
BSSMAP BSSMAP4. Handover
Request Ack
RANAP RANAP
13. Iu Release
Complete
BSSMAP BSSMAP
3. Handover
Request
MAP/E MAP/E
5. Prepare Handover
Response
RANAP RANAP
6. Relocation
Command
BSSMAP BSSMAP
8. Handover
Detect
BSSMAP BSSMAP
10. Handover
Complete
MAP/E MAP/E
11. Send End SignalRequest
MAP/E MAP/E
14. Send End Signal
Response
RANAP RANAP1. Relocation
Required
UE Node B
RNC
Serving CN MSC BSC BTS
RRC
7. DCCH : Inter-System Handover Command
RRC
RR9. Handover Complete
RR
RANAP RANAP
12. Iu Release
Command
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Forward Handover
Forward Handover, including CELL UPDATE and URA UPDATE, is
originated by UE. URA UPDATE procedure is only used for UE underURA_PCH state to process URA reselection, and to check if RRC
connection is right.
For UE under CELL_FACH and CELL_PCH state
cell reselection needed
In specific SA(Service Area)Timer T305 timed out (this timer is defined in
system broadcast message)
For UE under CELL_PCH and URA_PCH state
transfer data on up link needed (enter CELL_FACH state) upon receiving paging message on PCCH, originate cell update
CELL UPDATE process can be used to re-establish unrecoverable errors of
RLC entitylosing connection, and to monitor RRC connection state.
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Cell Update with SRNS relocation
UE Source RNC CNTarget RNC
2. Uplink SignallingTransfer Indicatio n
[new C-RNTI, D-RNTI,UL message]
1.CCCH: Cell Update
[Cell Update Cause,U -RNTI,easured results on PRACH]
RRC-relayRRC
RNSAP RNSAP
4.DCCH: Cell Update Confirm
[S
-
RNTI, SRNC
-
ID, new S
-
RNTI,
new SRNC -ID, new C -RNTI]
RRCRRC
5.DCCH: UTRAN Mobility Information ConfirmRRCRRC
3. Serving RNC Relocation
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Cell Update via Iur without SRNS relocation
UE DRNCsource
DRNCtarget
SRNC
RNSAP RNSAP8. Common Transp. Channel Resources Release
RNSAPRNSAP
2. Uplink Signalling TransferIndication
[new C-RNTI,D-RNTI,
UL message]
RNSAP
3. Common Transp. Channel Resources
Initialization Request
RNSAP
RRC1. CCCH: Cell Update
RRC-relay
RRC6. DCCH: Cell Update Confirm
RRC
RRC7.DCCH: UTRAN Mobility Information Confirm
RRC
RNSAPRNSAP
4. Common Transp. Channel ResourcesInitialization Response
5. ALCAP Iur bearer setup
Inter-RNS URA Update via Iur without
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p
SRNS relocation
UETarget
RNC
5.CCCH: URA Update Confirm
Source
RNC
2.Uplink Signaling Transfer Indication
Serving
RNC
[new C-RNTI,D-RNTI, UL message]
1.CCCH: URA Update
[U-RNTI, URA update cause]
RRC-relayRRC
3. Decision Not to
perform SRNS
relocation
RRC RRC-relay
RNSAP
RNSAP
4. Downlink Signaling Transfer Request
RNSAP
RNSAP
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Cell Reselection FlowUMTS->GPRS
UE CN
2. UE Access GPRS system
Serving
RNC
RANAP RANAP
4. Iu Release Command
RANAP RANAP4. Iu Release Complete
GPRS
1. UE releases connection with RNC
3. Inter-system information exchange
data transfer
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Cell reselection FlowGPRS->UMTSUE Serving
RNC
1. UE Access UMTS system(RNC)
CN
2. Make signaling connection with CN
3. User plane bearers set up
GPRS
4. Inter-system information exchangedata transfer
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