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Slide titleIn CAPITALS
50 pt
Slide subtitle 32 pt
WCDMA RAN PROTOCOLS AND PROCEDURES
Chapter 6:Iub Interface - NBAP Protocol
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol2
Objectives
After this chapter the participants will be able to:
1. Explain the Iub interface and the Radio Network Layer protocols: the Node B Application Part (NBAP) signaling protocol in the control plane and the user plane protocols for common transport channel (CCH) data streams and dedicated transport channel (DCH) data streams.
2. Explain the main functions and procedures of the NBAP signaling protocol.
3. Explain the main functions and procedures of the user plane protocols for CCH and DCH data streams (Frame Protocols).
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol3
Physical Layer
NBAP
RNL
TNL TN User Plane TN Control Plane TN User Plane
Control Plane User Plane
ATM
UNI -SAAL
Q.2630.2Q.2150.2
AAL2
PCH
FP
FAC
H FP
RA
CH
FP
DC
H FP
UNI-SAAL
Iub Interface
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol4
RNC MSCIub
UNI-SAAL
AAL5
ATMPHY
UNI-SAAL
AAL5ATM
PHY
NBAP NBAPNBAP Signaling
Uu
IuCS
IuPS SGSNRNC
Iur
Lower layer signaling
NBAP Protocol stack control plane
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol5
Transport Network User Plane for Iub
RNC MSCIub
AAL2
ATMPHY
AAL2ATM
PHY
Uu
IuCS
IuPS SGSNRNC
IurD
CH
FP
PCH
FP
RA
CH
FP
FAC
H FP
DC
H FP
PCH
FP
RA
CH
FP
FAC
H FP
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol6
RNC MSCIub
UNI-SAAL
AAL5
ATMPHY
UNI-SAAL
AAL5ATM
PHY
Q.2630.2 Q.2630.2Q.2630.2 Signaling
Uu
IuCS
IuPS SGSNRNC
Iur
Q.2150.2 Q.2150.2
Lower layer signaling
Transport Network Control Plane for Iub
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol7
Iub connections between RBS and RNC
User PlaneDCH, RACH, FACH, PCH
Q.AAL2
NBAP-Common
Mub
Sync
NBAP-Dedicated
User Plane, Q.AAL2 and NBAP connections from Iub reference model
Logical Mub interface for O&M traffic Background node synchronisation on high
priority connection
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol8
DCH RACH FACH PCH
AAL2
AAL2
AAL2
AAL2
User Plane
ALCAP
NBAP-C
Mub
Sync
NBAP-D
AAL5
AAL5
AAL5
AAL0
AAL5
VC
VC
VC
VC
VC
VC
VPPhysicallayer
VP
VC
VC
VC
VC
VC
VC
Transport connectivity options RBS-RNC
AAL5
AAL5
AAL5
AAL0
AAL5
ALCAP
NBAP-Common
Mub
Sync
NBAP-Dedicated
VC cross-connect solutions allowed for connections through CPP based nodes
Layer 1 co-sharing solutions
e.g. 63*E1 on STM-1
VP cross-connect solutions used when connecting to non-
CPP based ATM networks
AAL switching solutions AAL2 switching in CPP HW -
optimises User Plane transport efficiency
AAL2 DCH AAL2 RACH AAL2 FACH AAL2 PCH
User Plane
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol9
Transport of data frames (Transport Block Set (TBS)) between the RBS and the CRNC for common transport channels.
Support of transport channel synchronization mechanism (control frame).
Support of Node Synchronization mechanism (control frame)
Common Transport Channel ServicesThe Common Transport Channel (CCH) FP provides the following services:
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol10
Header Payload: Data or Control Information
There are two types of frames: Data Frame Control Frame
General structure of a Common Transport Channel Frame
The header contains a frame type field that indicates the type of frame.
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol11
Transport of data frames (Transport Block Set (TBS)) for Dedicated Transport Channels across Iub interface.
Transport of outer loop power control information between the SRNC and the RBS.
Support of transport channel synchronization mechanisms for achieving, maintaining and restoring the synchronization of the DCH data stream in downlink direction.
Support of node synchronization mechanism.
Dedicated Transport Channel ServicesThe Dedicated Transport Channel (DCH) FP provides thefollowing services:
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol12
Uu
SRNC
”UL Data Frame”
”UL Direct Transfer”
DCH FP
AAL2
ATM
Layer 1
DCH FP
AAL2
ATM
Layer 1
Header
PayloadHeader: •CRC checksum•Frame type (DCH data frame)•Information related to the frame type
Payload, data frame:•Radio interface user data•Quality information for theTransport blocks•Quality information for the physicalchannel during the TTI (UL only)•CRC (optional)
Dedicated Transport Channel (DCH), Data Frame Structure
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol13
Control Frame Type
Control Information
Control Information (cont.)
Spare Extension
7 0
F/T Frame CRC Header
Payload
Dedicated Transport Channel, Control Frame structure
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol14
Control Frame Type CodingOuter Loop Power Control 0000 0001
Timing Adjustment 0000 0010
DL Synchronization 0000 0011
UL Synchronization 0000 0100
DSCH TFCI Signaling 0000 0101
DL Node Synchronization 0000 1101
UL Node Synchronization 0000 0111
Rx Timing Deviation 0000 1000
Radio Interface Parameter Update
0000 1001
Note that DSCH TFCI Signaling, Rx Timing Deviation and Radio Interface Parameter Update are not implemented
Control Frame Types
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol15
Uu
SRNC
”UL Data Frame”
”UL Direct Transfer”
DCH FP
AAL2
ATM
Layer 1
DCH FP
AAL2
ATM
Layer 1
”DL Data Frame”
UL/DL Data Frame
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol16
SRNC
”Outer Loop PC”
Spare Extension
UL_SIR_TARGET 10-32 Payload
Based on the CRC Indicator values, the SRNC modifies the SIR target used by the UL inner loop power control by including the absolute value of the new SIR target in the OUTER LOOP PC control frame sent to the RBSs.
At the reception of the “Outer Loop PC” control frame, the RBS updates the SIR target used for the inner loop power control with the specified value.
Outer loop Power Control Frame
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol17
SRNC
”UL Synchronization”
”DL Synchronization”CFN
ToA & CFN
The procedure is initiated by the SRNC by sending a “DL Synchronization” control frame towards the RBS . This control frame indicates the target Connection Frame Number (CFN).
When the RBS receives this message, the RBS sends a response “UL Synchronization” control frame indicating the Time of Arrival (ToA) and CFN indicated in the received control frame.
DCH Synchronization
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol18
SRNC”Timing Adjustment”
Spare extension
ToA (cont)
ToA
CFN
7 01110-32
Payload
The SRNC always includes the Connection Frame Number (CFN) to all DCH DL Data Frames.
If a DL Data Frame arrives outside the arrival window defined in the RBS, the RBS sends a Timing Adjustment control frame, containing the measured Time of Arrival (ToA) and the CFN value of the received DL Data frame.
Timing Adjustment Control Frame
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol19
SRNC
”UL Node Synchronization”
”DL Node Synchronization”
T1
T1, T2 and T3
T1: indicates when the SRNC sends the DL Node Synchronization frame. T2: indicates when the RBS received the DL Node Synchronization frame. T3: indicates when the RBS sends the UL Node Synchronization Frame
Node Synchronization
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol20
NBAP Common: Procedures that request initiation of a UE context for a specific UE in RBS or are not related to a specific UE.
Cell Configuration: – Cell Setup– Cell Reconfiguration – Cell Deletion
Common Transport Channel Handling:– Common Transport Channel Setup– Common Transport Channel Reconfiguration – Common Transport Channel Deletion
Radio Link Setup Measurements on Common Resources:
– Common Measurement Initiation– Common Measurement Reporting– Common Measurement Termination– Common Measurement Failure
NBAP Common Procedures
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol21
CRNC
”Cell setup Request”
RBS
”Cell setup Response”
Initiated by a “Cell Setup Request” message sent from the CRNC to the RBS.
When the cell is successfully configured CPICH, SCH, P-CCPCH and BCH exist and their power levels are set and the RBS sends a “Cell Setup Response” message back to the CRNC.
Cell Setup Procedure
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol22
CRNC
”Common Transport Channel Setup Request”
RBS
”Common Transport Channel Setup Response”
The procedure is initiated with a “Common Transport Channel Setup Request” message to set up the common channels (transport and physical channels) in the RBS.
S-CCPCH, FACH, PCH and PICH. PRACH, RACH and AICH. After successful procedure the RBS responds with a “Common
Transport Channel Setup Response”
Common Transport Channel Setup Procedure
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol23
Serving RNC
NBAP4. Radio Link Setup Request
5. Radio Link Setup Response
1. RRC Connection Request
NBAP
2. Power Control Algorithm, Iub and Uu Timing Scheduling Algorithm.
3. Admission Control Algorithm, Code Control Algorithm
Resource allocation
NBAP NBAP
8. Start Tx of DL DPCH, start Rx of UL DPCH, start RLS Supervision.
10. L1 Synchronization
9. RRC Connection Setup
12. RRC Connection Complete
11. Radio Link Restore Indication
RRC RRC
NBAP NBAP
6. Q.2630.2 est req/est confirm
7. Downlink/Uplink Synchronization
RRC RRC
Radio Link Setup Procedure
RRCRRC
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol24
SRNCRBS
Common to Dedicatede.g. FACH to PS Streaming, FACH to SP0
Radio Link Setup
”Radio Bearer Setup”
”Radio Bearer Setup Complete”
”Radio Bearer Reconfiguration”
”Radio Bearer Reconfiguration Complete”
Radio Link Synchronization
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol25
SRNCUu
Iub
NBAP NBAP1. ”Radio link Setup Response”
Binding ID, Transport Layer
AddressQ.2630.2 (ALL2)
2. Transport Layer Address & Binding ID
3. ”ALCAP Establish Request”
Binding ID & Transport Layer address
4. Bindning ID
Q.2630.2 (ALL2)
Usage of Binding Identity
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol26
CRNC
”Common Measurement Initiation Request”
RBS
” Common Measurement Initiation Response”
Initiated by a “Common Measurement Initiation” message sent from the CRNC to the RBS.
Measurement can be done on for example Received Total Wideband Power (RTWP) and Transmitted Carrier Power in the RBS that are used for power control and Admission control.
If the RBS was able to initiate the measurement, it sends a “Common Measurement Initiation Response” to the CRNC.
Common Measurement Initiation Procedure
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol27
CRNC
”Common Measurement Report”
RBS
To report the results of the measurements requested by the CRNC, the RBS sends a “Common Measurement Report” message to the CRNC.
Common Measurement Report Procedure
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol28
NBAP Dedicated: Procedures that are related to a specific UE context in the RBS. This UE context is identified by a specific UE context identity.
Radio Link Management: Radio Link AdditionSynchronized/Unsynchronized Radio Link Reconfiguration Radio Link Deletion
Measurements on Dedicated Resources:Dedicated Measurement InitiationDedicated Measurement ReportingDedicated Measurement TerminationDedicated Measurement Failure
Compressed Mode Control Radio Link Supervision:
Radio Link FailureRadio Link Restore
NBAP Dedicated Procedures
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol29
CRNC
”Radio Link Addition Request”
RBS
”Radio Link Addition Response”
The Radio Link Addition procedure is used for establishing the necessary resources in the RBS for one or more additional Radio Links towards a UE when there is already a Node B communication context for the UE in the RBS.
Radio Link Addition Procedure
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol30
CRNC
”Radio Link Reconfiguration Prepare”
RBS
”Radio Link Reconfiguration Ready”
”Radio Link Reconfiguration Commit”
The Synchronized Radio Link Reconfiguration procedure is used to prepare a new configuration of Radio Link(s) related to one UE connection within a RBS when synchronization is needed.
Synchronized Radio Link Reconfiguration Procedure
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol31
SRNCRBS
Dedicated to Dedicated e.g. SRB to Speech, SRB to in 64/64, SRB to 64/HS-DSCH, Int 64/64 to PS Streaming
Radio Link Reconfiguration Preparation
”Radio Bearer Setup”
”Radio Bearer Setup Complete”
”Radio Bearer Reconfiguration”
”Radio Bearer Reconfiguration Complete”
Radio Link Reconfiguration Execution
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CRNC
”Radio Link Deletion Request”
RBS
”Radio Link Deletion Response”
It is also possible to release the resources in a RBS for one or more established Radio Links towards a UE.
Radio Link Deletion Procedure
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol33
SRNCRBS
Dedicated to Common Cell_DCH to FACH
RRC: ”Physical Channel Reconfiguration” (C-RNTI, PRACH info)
RRC: ”Physical Channel Reconfiguration Complete”
NBAP: ”Radio Link Deletion Request”
NBAP: ”Radio Link Deletion Response”
Q. 2630.2 Iub Trans. Bearer Release
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol34
CRNC
”DL Power Control Request”
RBS
Is used to balance the power of the radio link(s) in the RBS. If the Power Adjustment Type IE is set to common, the RBS performs power balancing for all existing and
future radio links. If the Power Adjustment Type IE is set to individual, the ones specified in the message is power balanced.
DL Power Control
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol35
CRNC
”Dedicated Measurement Initiation Request”
RBS
” Dedicated Measurement Initiation Response”
”Dedicated Measurement Report”
”Dedicated Measurement Termination Request”
”Dedicated Measurement Failure Indication”
Measurements can be done on for example Radio Link Sets (RLS).
Dedicated Measurement Initiation, Reporting, Termination and Failure Procedures
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol36
CRNC
”Compressed Mode Command”
RBS
Is used to activate or deactivate compressed mode in the RBS for one UE context by sending a “Compressed Mode Command” message to the RBS.
Compressed Mode Command
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol37
CRNC
”Radio Link Failure Indication”
RBS
”Radio Link Restore Indication”
Is used to indicate a failure in on or more Radio Link Sets and a “Radio Link Failure Indication” message is sent to the CRNC.
When a Radio Link is restored a “Radio Link Restore Indication” is sent to the CRNC.
Radio Link Failure/Restore Procedure
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6/038 13-EN/LZU 108 5886 Uae Rev G . Figure 6- WCDMA RAN Protocols and Procedures: Iub Interface - NBAP Protocol38