06_iub interface - nbap protocol

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WCDMA RAN PROTOCOLS AND PROCEDURES

Chapter 6:Iub Interface - NBAP Protocol

Top right corner for field-mark, customer or partner logotypes. See Best practice for example.

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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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06_iub interface - nbap protocol

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