UMTS-UTRAN-Signaling-Procedures
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Transcript of UMTS-UTRAN-Signaling-Procedures
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UMTS UTRAN Signaling Procedures
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1 1 UTRAN System Architecture and UTRAN System Architecture and
Protocol StackProtocol Stack
2 Basic Terms Related to the UTRAN2 Basic Terms Related to the UTRAN
3 Basic Signaling Procedures3 Basic Signaling Procedures
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UTRAN System Architecture
RNS
RNC
RNS
RNC
Core Network
Node B Node B Node B Node B
Iu Iu
Iur
Iub IubIub Iub
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WCDMA Protocol Architecture
AAL5
RANAPSCCP
Relay
RRCRLC
MAC
L1
RANAPSCCP
AAL5
Uu IuUE RNS MSC/
SGSNN
SignallingBearer
RRCRLC
MACSignalling
Bearer
ATM
L1
ATM
SMS /GMM / MM
SMS /GMM / MM
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Comparison: GSM-BSS Protocol Architecture
CM
MM
RR
LAPDm
SigL1
L3
L2
L1
MS
RR BTSM
LAPDm
SigL1
LAPD
SigL1
LAPD
SigL1
BTSM
RR
SCCP
MTP
BSSMAP
CM
MM
BSSMAP
SCCP
MTP
MSCBSCBTS
Um接接 A接接Abis接接
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Protocol Architecture for the RNC Control Plane
Node B
RNC
CN
UE
RANAP
NBAP
RNSAPRRC
NBAP :Node B Application PartRANAP:Radio Access Network Application PartRNSAP:Radio Network Subsystem Application PartRRC :Radio Resource Control
RNC
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Summary
� This part describes the UTRAN
system architecture and the protocol
architecture.
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1 UTRAN System Architecture and 1 UTRAN System Architecture and
Protocol StackProtocol Stack
2 Basic Terms Related to the UTRAN2 Basic Terms Related to the UTRAN
3 Basic Signaling Procedures3 Basic Signaling Procedures
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Basic Terms� UTRAN:provides setup, maintenance, and release of radio access
bearer (RAB) for the Non-Access Stratum (NAS) to shield the focus of
the NAS on the features of the radio access stratum.
� Other terms: UTRAN, RAB, RB, and RL
RAB
RB
RLNodeB
RNC CNUE
UTRAN
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Basic Terms
� RAB: The service that the access stratum provides to
the Non-Access Stratum (NAS) for transfer of user data
between User Equipment and CN.
� RB:The service provided by the Layer 2 for transfer of
user data between User Equipment and SRNC.
� RL: A "radio link" is a logical association between single User
Equipment and a single UTRAN access point. Its physical
realisation comprises one or more radio bearer transmissions.
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CELL_DCH CELL_FACH
CELL_PCHURA_PCH
IDLE
DEAD - Searching for the network (PLMN)- Camp on the cell
- Monitoring paging channel- Cell reselection
- Dedicated channel - Radio bearers transmission servcie
- Reducing actions, DRX, and saving power
RRC connection
These states are significant only for UTRAN and UE. They are transparent to
CN.
UE States
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Working Modes of the UE
� The UE has two working modes: idle mode and connected mode.
� Idle mode: The UE is in the standby state and has no service for
processing. In addition, no connection exists between the UE and
UTRAN, and the UTRAN does not contain any information about the UE. The UE is identified by the NAS identifiers, such as the IMSI,
TMSI, or P-TMSI.
� Connected mode: When the UE completes the RRC connection setup, the UE changes from the idle mode to the connected mode.
In Connected mode, the UE has four states: Cell-DCH, Cell-FACH,
Cell-PCH, and URA-PCH.
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UE States in Connected Mode
� Cell-DCH:The UE is in the active state. It communicates over the dedicated
channel. The UE has a dedicated channel in both the uplink and
downlink. The UTRAN accurately knows the cell on which the UE
camps.
� Cell-FACH
The UE is in the active state, but it has few data to send in both the uplink and downlink. It is not required to allocate a dedicated
channel for the UE. The downlink data is transmitted over the FACH,
and the uplink data is transmitted over the RACH. The UE needs to monitors the FACH in the downlink at any time for its information.
The UTRAN accurately knows the cell on which the UE camps and
maintains the resources for the UE and its state.
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UE States in Connected Mode
� Cell-PCH
The UE has no data to send in the uplink and downlink. It needs to monitor the PICH for receiving paging messages. Therefore, the UE
enters the discontinuous reception, which saving the power.
The UTRAN knows which cell that the UE camps on. Thus, after theUE roams to another cell, the UTRAN needs to update the cell
information of the UE.
� URA-PCHThe UE has no data to send in the uplink and downlink. It needs to
monitor the PICH and enters the discontinuous reception. The
UTRAN knows only the UTRAN registration area (URA) of the UE. A URA contains multiple cells. That is, the UTRAN updates the
location information only after the URA where the UE is located
changes, thus saving resources and reducing signaling.
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Serving RNC and Drift RNC
� In the WCDMA system, the SRNC and DRNC are introduced due to the Iur interface.
� The SRNC and DRNC correspond to a specific UE.
� For connections between a UE and the CN, the RNC that is directly connected the CN and controls all resources of the UE is called the SRNC. The RNC that has no direct connection with the CN and only provides resources for the UE is called DRNC.
� A UE in connection state has at least one and only one SRNC, but can have no or
multiple DRNCs.
CN
SRNC DRNC
IuIur
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CRNC
� The controller RNC (CRNC) corresponds to a NodeB or cell.
� The RNC that is directly connected to a NodeB and controls the usage of resources of the NodeB is called the CRNC.
� A NodeB corresponds to one and only one CRNC.
� The CRNC allocates the resources of all the NodeBs controlled bythe CRNC properly.
Iub
Node B
Cell Cell Cell
Node B
...
Iu
CRNC
CN
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Summary
� This part describes some terms related to the UTRAN.
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1 UTRAN System Architecture and 1 UTRAN System Architecture and
Protocol StackProtocol Stack
2 Basic Terms Related to the UTRAN2 Basic Terms Related to the UTRAN
3 Basic Signaling Procedures3 Basic Signaling Procedures
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Basic Signaling Procedures
�� System Information System Information
BroadcastingBroadcasting
�� PagingPaging
�� Paging ProcedurePaging Procedure
�� HandoverHandover
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System Information BroadcastingSystem Information Broadcasting
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Overview of the System InformationOverview of the System InformationMIB: includes the PLMN identifier and the scheduling information of the schedule block (SB) and system block (SB).SB1: includes the scheduling information of the SIB.SB2 : includes the scheduling information of the SIB.SIB1: includes the UE timers and counters and the system information at the NAS. SIB2: includes the URA information.SIB3: includes the parameters for cell selection and reselection. SIB4: includes the parameters for cell selection and cell reselection in connected mode. SIB5: includes the parameters for the configuration of the common physical channel in a cell. SIB6: includes the parameters for the configuration of the common physical channel in a cell in connected mode. SIB7: includes the information about the uplink interface and dynamic persistence level. SIB8: includes the static information about the CPCH in the cell. SIB9: includes the dynamic information about the CPCH in the cell. SIB10: includes the information of dynamic resource assignment control (DRAC).SIB11: includes the measurement control information. SIB12: includes the measurement control information in connected mode. SIB13: includes the ANSI-41 system information. SIB14: includes the information in TDD mode. SIB15: includes the information for LCS.SIB16: includes the reconfiguration information about the handover from another system to the UTRAN.SIB17: includes the configuration information of the shared physical channel in connected mode (TDD).SIB18: includes the information of the neighboring PLMN.Note: The network planning engineers should pay more attention to the system information in blue.
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SI1SI1
The SIB1 includes the following information:�System information at the NAS, such as LAC, RAC, and T3212�DRX period coefficient of the CS domain: K = 6, that is, DRX period 2^k = 2 ^ 6 = 64 TTI = 640 ms.�DRX period coefficient of the PS domain K = 6, that is, DRX period 2^k = 2 ^ 6 = 64 TTI = 640 ms.�Timers and counters of the UE in connected mode or timers of the UE in idle mode
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SI3SI3
The System info type 3 includes the parameters for cell selection and reselection. �Qhyst2s: indicates the cell reselection hysteresis of Ec/Io measurement. �Sintrasearch: indicates the intra-frequency reselection start threshold.�Sintersearch: indicates the inter-frequency reselection start threshold.�SinterRatsearch: includes the inter-system reselection start threshold.�Qqualmin: indicates the minimum quality standard for cell selection. �Qrxlemin: indicates the minimum access level for cell selection. �T reselection: indicates the reselection hysteresis time. �Max Allowed UE TX power: indicates the maximum transmit power allowed by the UE.
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SI5SI5
The System info type 5 includes the feature parameters of the following common physical channels and the configuration information of the corresponding common transport channels:�PICH�AICH�PCCPCH�PRACH�SCCPCH
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SI7 and SI11SI7 and SI11
System info type 7
� UL interference: The open-loop power control uses the
Preamble_Initial_Power=Primary CPICH DL TX power - CPICH_RSCP + UL
interference + Constant Value.
�Expiration Time Factor: indicates the update period for the SIB7 by the UE. The
value can be : (2, 4, 8, 16, 32, 64, 128, 256)times. The existing value is 16 times, that
is, the period is “4096 / 16 = 32 TTI = 320 ms”.
System info type 11
�The intra-frequency neighbor list, inter-frequency neighbor list, and inter-
RAT frequency list and the measurement configuration information of the
UE in Idle state are used for cell resection of the UE in the idle state.
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Basic Signaling Procedures
�� System Information System Information
BroadcastingBroadcasting
�� PagingPaging
�� Paging ProcedurePaging Procedure
�� HandoverHandover
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CN-Initiated Paging
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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CN-Initiated Paging� Paging type 2
If the UE is in the CELL_DCH or CELL_FACH state, the UTRAN sends the paging type 2 message to
the paged UE over the DCCH.
CN SRNC UE
RANAPRANAP
PAGING
RRCRRC
DCCH: PAGING TYPE 2
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UTRAN-Initiated Paging
UE RNC1NodeB1
RRCPaging Type 1RRC
�When the system information changes, the UTRAN triggers the paging procedure to notify the UE in the idle mode, CELL_PCH state, andURA_PCH state to update the system information, so that the UE can obtain the updated system information. �To trigger the state change (for example, the state changes to the CELL_FACH) of the UE in the CELL_PCH and URA_PCH states, the UTRAN initiates the paging procedure. As an acknowledgment for the paging, the UE initiates the cell update or URA update.
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Basic Signaling Procedures
�� System Information System Information
BroadcastingBroadcasting
�� PagingPaging
�� Paging ProcedurePaging Procedure
�� HandoverHandover
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3 Call Procedure3 Call Procedure
3.1 Call Overall Procedure3.1 Call Overall Procedure
3.2 RRC Setup Procedure3.2 RRC Setup Procedure
3.3 NAS Signaling Setup Procedure3.3 NAS Signaling Setup Procedure
3.4 RAB Setup Procedure3.4 RAB Setup Procedure
3.5 RAB Release Procedure3.5 RAB Release Procedure
3.6 RRC Connection Release Procedure3.6 RRC Connection Release Procedure
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Call Overall Procedure—UE as Calling Party
Process of signaling connection setup between the UE and UTRAN
Signaling exchange between the UE and CN
Process of service connection between the UE and
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3 Call Procedure3 Call Procedure
3.1 Call Overall Procedure3.1 Call Overall Procedure
3.2 RRC Setup Procedure3.2 RRC Setup Procedure
3.3 NAS Signaling Setup Procedure3.3 NAS Signaling Setup Procedure
3.4 RAB Setup Procedure3.4 RAB Setup Procedure
3.5 RAB Release Procedure3.5 RAB Release Procedure
3.6 RRC Connection Release Procedure3.6 RRC Connection Release Procedure
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When the NAS of the UE in idle mode requests for signaling connection setup,
the UE initiates the RRC connection setup procedure. Each UE has a maximum of one RRC connection.
The RRC connection setup is used to configure the signaling channel at the UTRAN side.
RRC Connection Setup Procedure
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RRC CONNECTION REQUEST
UE identifier
RRC connection setup cause
RACH measurement report
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RRC CONNECTION SETUP
Configure the dedicated transport channel format.
Configure the message bearer format over the DCCH.
Configure the ID of the UE in the RNC.
Configure the physical channel format.
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RRC CONNECTION SETUP COMPLETE
Authentication parameters of the CS and PS domains
UE capability parameters
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3 Call Procedure3 Call Procedure
3.1 Call Overall Procedure3.1 Call Overall Procedure
3.2 RRC Setup Procedure3.2 RRC Setup Procedure
3.3 NAS Signaling Setup Procedure3.3 NAS Signaling Setup Procedure
3.4 RAB Setup Procedure3.4 RAB Setup Procedure
3.5 RAB Release Procedure3.5 RAB Release Procedure
3.6 RRC Connection Release Procedure3.6 RRC Connection Release Procedure
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SETUP
Voice service
Called number
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3 Call Procedure3 Call Procedure
3.1 Call Overall Procedure3.1 Call Overall Procedure
3.2 RRC Setup Procedure3.2 RRC Setup Procedure
3.3 NAS Signaling Setup Procedure3.3 NAS Signaling Setup Procedure
3.4 RAB Setup Procedure3.4 RAB Setup Procedure
3.5 RAB Release Procedure3.5 RAB Release Procedure
3.6 RRC Connection Release Procedure3.6 RRC Connection Release Procedure
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There are more than one ALCAP setup procedures on Iu Interface, and more than one user plane RABs can be established simultaneously. After the user plane is established, the UE enters the call connection.In the protocols, the RAB is defined as the bearer for the NAS by the access stratum. The RAB refers to the bearer of the user plane and is used to transmit voice services, data services, and multimedia services between the UE and CN.The RAB setup consists of the setup of the service bearer AAL2 PATH of the Iu interface and Iub interface and the reconfiguration of radio resources of the RAN and UE.
QAAl2QAAl2QAAl2QAAl2QAAl2QAAl2QAAl2QAAl2
QAAl2QAAl2QAAl2QAAl2 QAAl2QAAl2QAAl2QAAl2
RAB Setup Procedure
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RAB Assignment Request
If there are multiple types of services, each type of service establishes an RAB respectively.
Service type
Service bearer rate
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RB Setup
Mapping information of the RAB, including three RB sub-flows
Configure both uplink and downlink transport channels, reconfigure the DCH, and add three DCHs to carry services.
Configuration process of the physical channel
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3 Call Procedure3 Call Procedure
3.1 Call Overall Procedure3.1 Call Overall Procedure
3.2 RRC Setup Procedure3.2 RRC Setup Procedure
3.3 NAS Signaling Setup Procedure3.3 NAS Signaling Setup Procedure
3.4 RAB Setup Procedure3.4 RAB Setup Procedure
3.5 RAB Release Procedure3.5 RAB Release Procedure
3.6 RRC Connection Release Procedure3.6 RRC Connection Release Procedure
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The RAB release is initiated by the CN. When the UE is exceptional, the SRNC also requests for RAB release.
RAB Release Procedure
For multiple RABs For a single RAB, the RAB release is initiated by the RNC.
The contents of the RAB assignment request message are different from that of the RAB setup message. The message contains Release.
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3 Call Procedure3 Call Procedure
3.1 Call Overall Procedure3.1 Call Overall Procedure
3.2 RRC Setup Procedure3.2 RRC Setup Procedure
3.3 NAS Signaling Setup Procedure3.3 NAS Signaling Setup Procedure
3.4 RAB Setup Procedure3.4 RAB Setup Procedure
3.5 RAB Release Procedure3.5 RAB Release Procedure
3.6 RRC Connection Release Procedure3.6 RRC Connection Release Procedure
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The RRC connection release is initiated by the CN. When the UE is exceptional, the SRNC also requests for RRC connection release.The connection to the UE is released first, and then the connection to the NodeB is released. The RRC connection release means the termination of a call.
UE NodeB SRNC
RRC CONNECTION RELEASE
RRC CONNECTION RELEASE COMPLETE
RL DELETION
RL DELETION RESPONSE
ALCAP :Iub Date Bearer Release
RRC Connection Release Procedure
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Basic Signaling Procedures
�� System Information System Information
BroadcastingBroadcasting
�� PagingPaging
�� Paging ProcedurePaging Procedure
�� HandoverHandover
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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
NBAP2. 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 TX description
RRC
RRC
RRC
RRC
Intra-RNC Soft Handover Procedure (Adding a 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
Intra-RNC Soft Handover Procedure (Deleting a Branch)Intra-RNC Soft Handover Procedure (Deleting a Branch)
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Before soft handover After soft handover
When a radio link between the RNC and another NodeB is added,
the original radio link between the SRNC and a NodeB is deleted.
CN
SRNC RNC
NodeB NodeBNodeB
CN
SRNC RNC
NodeB NodeBNodeB
Inter-RNC Soft HandoverInter-RNC Soft Handover
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7. Uplink Synchronisation
RNSAP RNSAP
1. Radio Link Setup Request
Start TX description
RNSAP RNSAP
4. Radio Link SetupResponse
NBAP NBAP2. Radio Link Setup Request
NBAP NBAP3. Radio Link Setup Response
Start RX description
Decision to setupnew RL and
release old RL
NBAP10. Radio Link Deletion Request
NBAP NBAP11. Radio Link Release Response
Stop RX and TX
12. ALCAP Iub Data Transport Bearer Release
RRCRRC9. DCCH : Active Set Update Complete
RRCRRC8. DCCH: Active Set Update
[Radio Link Addition & Deletion]
NBAP
UE Node BDrift RNS
Node BServing RNS
Drift RNC Serving RNC
ALCAP Iur Bearer Setup5. ALCAP Iub Data Transport Bearer Setup
DCH-FPDCH-FP
DCH-FPDCH-FP
6. Downlink Synchronisation
Inter-RNC Soft Handover Procedure (Replacing a Radio Link)Inter-RNC Soft Handover Procedure (Replacing a Radio Link)
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Before hard handover After hard handover
The SRNC cannot maintain two radio links with two NodeBs at the same time.
CN
SRNC
NodeBNodeB
CN
SRNC
NodeBNodeB
Intra-RNC Hard Handover Intra-RNC Hard Handover
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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 Iub Data Transport Bearer Setup
7. Radio Link Failure IndicationRRCRRC
NBAPNBAP
NBAP
RRCRRC
NBAP
NBAP
NBAP NBAP
Decide tohandover
Start Rx
Start Tx
DCH-FP4. Downlink SynchronisationDCH-FP
DCH-FP5.Uplink SynchronisationDCH-FP
NBAP
NBAP
NBAP
11. ALCAP Iub Data Transport Bearer Release
Intra-RNC Hard Handover Procedure Intra-RNC Hard Handover Procedure
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Before hard handover After hard handoverThe radio link between the SRNC and a NodeB and the radio link between the RNC
and another NodeB cannot exist at the same time.
CN
SRNC RNC
NodeBNodeB
CN
SRNC RNC
NodeBNodeB
Inter-RNC Hard HandoverInter-RNC Hard Handover
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RNSAPRNSAP1. Radio Link Setup Request
UE Node B Source
Node BTarget
RNCSource
RNCTarget
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 NBAP12. Radio Link Deletion Request
NBAP NBAP13. Radio Link Deletion Response
4. ALCAP Iub Data Transport Bearer Setup
14. ALCAP Iub Data Transport Bearer Release
RNSAP RNSAP15. Radio Link Deletion Response
16. ALCAP Iur Data Transport Bearer Release
RNSAP5. RL Setup Response
RNSAP
RNSAP11. Radio Link Deletion Request
RNSAP
NBAP NBAP8. Radio Link Failure Indication
RNSAPRNSAP
9. Radio Link Failure Indication
Inter-RNC Hard Handover Procedure (over the Iur Interface)Inter-RNC Hard Handover Procedure (over the Iur Interface)
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SRNC RelocationSRNC Relocation
SRNS
Core Network
Iu
DRNS Iur
UE
RNS
Core Network
Iu
SRNS
UE
After SRNS Relocation Before SRNS Relocation
Cells
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Types of SRNS RelocationTypes of SRNS Relocation
According to existing realization modes of the RNC, the SRNS relocation can be classified into the following types:
� Static relocation
� Relocation after the DRL is established when the UE is in the CELL_DCH state. It is called the static state.
� Relocation after the IUR CCH is established when the UE is in the CELL_FACH state. It is called the FACH static relocation.
� Relocation with hard handover: indicates the relocation triggered by inter-RNC handover when the UE is in the CELL_DCH state.
� Relocation with forward handover: indicates the relocation triggered by the cell update or URA update when the UE is in the CELL_FACH, CELL_PCH, or URA_PCH state.
� Inter-RAT handover: The handover procedure between WCDMA and GSM is basically the same as the relocation with hard handover.
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Static RelocationStatic Relocation
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Relocation with Hard Handover (CS)Relocation with Hard Handover (CS)
SourceRNC TargetRNCCN
Relocation Reqired
Reloc Req
RANAP RANAP
RANAP RANAP
RANAP RANAPReloc Req Ack
RANAP RANAPRelocation Cmd
RANAP
RANAPIU Rel Complete
RNSAP RNSAPReloc Detect
UE
RRC Physical Channel Recfg Req
NodeB
RNSAP RNSAPRL Restore Ind
RRC
RRCRRC Physical Channel Recfg Complete
NodeB
RANAP RANAPRL Del Req
RANAP RANAPRL Del Rsp
RANAP
RANAP IU Rel Cmd
RL Setup ReqNBAP NBAP
NBAP NBAPRL Setup Rsp
Est Req
Est Conf
DL Sync
UL Sync
Q.AAL2
Q.AAL2
Q.AAL2
Q.AAL2
DCH-FP
DCH-FP
DCH-FP
DCH-FP
The handover procedure is similar to the inter-BSC handover
procedure in the GSM system.
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Relocation with Hard Handover (PS)Relocation with Hard Handover (PS)
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Inter-RAT Handover Procedure (from UMTS to GSM)Inter-RAT Handover Procedure (from UMTS to GSM)
谢谢
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