C19 WCDMA RAN Interface and Procedure

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Transcript of C19 WCDMA RAN Interface and Procedure

WCDMA RAN Interface and Procedure1

Course Contents

Chapter 1 UTRAN Network Architecture Chapter 2 UTRAN Interface Protocol and Functions Chapter 3 Basic Signaling Process

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UMTS System ArchitectureCNIu

UTRANUu

UE

UTRAN CN UE

UMTS Terrestrial Radio Access Network Core Network User Equipment3

UTRAN System ArchitectureCore Network Iu RNS Iur RNC RNC Iub Node B Iub Node B Iub Node B RNS Iu

IubNode B

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Common Protocol Model of UTRAN InterfacesThe principle of interface protocol architecture is the logical mutual-independence between layers and planes. Protocol layers of a specified protocol version, or even all layers in a plane can be modified if required in the future.

Radio Network Layer

Control Plane Application Protocol

User Plane Data Stream(s)

Transport Network Layer

Transport Network User Plane

Transport Network Control Plane

Transport Network User Plane

ALCAP(s) Signalling Bearer(s) Signalling Bearer(s) Data Bearer(s)

Physical Layer

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Basic Notions

UE Working Mode and State

Serving RNCDrift RNC and Control RNCSource RNC and Target RNC

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UE Working Modes and states

Idle Mode

In standby state with no service conducted

No connection to UTRANThere is no information related to this UE in UTRAN

Connected Mode (Cell-DCH, Cell-FACH, Cell-PCH, URA-

PCH)

Cell-DCH In active state Communicating via its dedicated channels UTRAN knows which cell UE is in.

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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 cell8

URA-PCH State

URA-PCH No data to be transmitted or received. Monitor PICH. to enter the non-consecutive state. 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 toother URA. A better way to lower the resource occupancy and signaling transmission

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UE states- Reduce actionDTXand save power RRC connectionURA_PCH CELL_PCH

CELL_DCH

CELL_FACH

- Dedicated Channel - Radio bearers Transmission ServicesIDLE

- upper layer Signaling trigger (CN) - Monitor paging channel - cell re-selection

DEAD

- Scanning networks (PLMN) - Camp on cell10

SRNC/DRNCCN Iu SRNC Iur DRNC

In WCDMA system notion of SRNC/DRNC is introduced because the existence of Iur Interface SRNC and DRNC are related to a specific UE. They can be regarded as logical notions In brief, the RNC directly connected to CN and controlling all the UEs

resources is called SRNC(serving RNC) of this UE

The RNC with no connection to CN but only providing resources for UE is called DRNC(Drift RNC) of this UE A UE in connection state has at least and only one SRNC, but can has 11 0

or multiple DRNCs

CRNCCN Iu CRNC Iub Node BCell Cell Cell

...Node B

CRNC is related to a specific NodeB (or Cell) The RNC connected directly to a NodeB and controlling the usage of its resources is called the CRNC of this NodeB

There is and only one Controlling RNC for any NodeB CRNC is in charge of the allocation and usage of NodeBs resources12

Source RNC/Target RNCCN CN Iur Target RNC RNC

Iu Source RNC

Iu Serving RNC

SRNC Relocation is the process of switching the SRNC of a specific UE.

Source RNC is the SRNC before SRNC Relocation and Target RNC is the SRNC after SRNC Relocation

Source RNC and Target RNC refer to different RNCs during aSRNC Relocation process13

Course Contents

Chapter 1 UTRAN Network Architecture Chapter 2 UTRAN Interface Protocol and Functions Chapter 3 Basic Signaling Process

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UTRAN Interface Protocols and Functions

Iu Interface

Iur InterfaceIub Interface Uu Interface

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Iu Interface System Structure

UTRANNode B RNC Node B

Core Network (CN)CS Domain Iu-CS PS Domain Iu-PS RNC

Node B

Node B

Iu Interface16

Iu-CS Interface Protocol Stack StructureRadio Network Layer Control Plane RANAP User Plane Iu UP Protocol Layer

Transport Network Layer

Transport Network User Plane

Transport Network Control PlaneQ.2630.1

Transport Network User Plane

SCCP MTP3b SSCF-NNI SSCOP AAL5

Q.2150.1 MTP3b SSCF-NNI SSCOP AAL5 AAL2

ATM Physical Layer

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Iu-PS Interface Protocol Stack StructureRadio Network Layer Control Plane RANAP User Plane Iu UP Protocol Layer

Transport Network Layer

Transport Network User PlaneSCCP M3UA MTP3-B SCTP SSCF-NNI SSCF-NNI SSCOP AAL5 IP

Transport Network Control Plane

Transport Network User Plane

GTP-U UDP IP AAL5

ATM Physical Layer

ATM Physical Layer

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Iu Interface Functions(1)

Mobility Management

Location Area Report

SRNS RelocationHard handover between RNCs and inter-system handover

Radio Access BearerRABManagement

Establishment, Modification and Release of RAB

Iu data transmission

normal data transmission abnormal data transmission Transparent transmission of UE-CN connection information

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Iu Interface Functions(2)

Paging Iu Release Security Mode Control Overload Control Common UE IDIMSIManagement Iu Signaling Trace Management Iu Interface Abnormality Management CBS(Cell Broadcast Service) Control

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UTRAN Interfaces Protocols and FunctionsIu Interface

Iur InterfaceIub Interface Uu Interface

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Iur Interface Protocol Stack StructureRadio Network Layer Control Plane RNSAP User Plane Iur Data Stream(s)

Transport Network Layer

Transport Network User Plane

Transport Network Control PlaneALCAP(Q.2630.1)

Transport Network User Plane

SCCP MTP3-B SSCF-NNI SSCF-NNI SSCOP AAL5 M3UA SCTP IP

STC (Q.2150.1)

MTP3-B SSCF-NNI SSCF-NNI SSCOP AAL5

M3UA SCTP IP AAL2

ATM Physical Layer

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Iur Interface Functions(1)

Support Basic Mobility Functions between RNCs

Support SRNC relocation

Cell Update and URA Update between RNCsPaging between RNCs Protocol Error Report

Dedicated Channel Functions

Establish, Modify or Release Dedicated Channels in DRNC during handover

Transmission of DCH TB(Transmission Block) on Iur Management of RL(Radio Link) in DRNS by Dedicated Measurement Procedure and Filter Control

RL ManagementCompressed Mode Management23

Iur Interface Functions(2)

Common Channel Functions

Establishment, Deletion of Common transport Channels on IurCommon Transport Channels are used to Transmit UE information which is in Common Channel state in DRNC

Separate MAC-d From MAC-c Traffic Control Between MAC-d and MAC-c

Global Resource Management

Common Measurement Between RNCs Transmission of Node B Timing Information between RNCs

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UTRAN Interfaces Protocols and Functions

Iu Interface

Iur InterfaceIub Interface Uu Interface

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Iub Interface Protocol StackRadio Network Control Plane Transport Network Control Plane User Plane

PCH FP

RACH FP

FACH FP

DSCH FP

USCH FP

Radio Network Layer

Node B Application Part (NBAP)

CPCH FP

DCH FP

ALCAP Q.2630.1 Q.2150.2

Transport Layer

SSCF-UNI SSCOP AAL Type 5

SSCF-UNI SSCOP AAL Type 5 ATM Physical Layer AAL Type 2

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Iub Interface Functions(1)

Common Functions

Common Transport Channel Management Iub Common Channel Data Transmission

Logical O&M of Node Bmaintenance functions such as cellconfiguration Management Fault Management Block Management, etc.

System Information Management Common Measurement Resource Verification Abnormality Management

Timing and Synchronization Management27

Iub Interface Functions(2)

Dedicated Functions

Dedicated Transport Channel ManagementRadio Link(RL) Monitoring Dedicated Measurement Management Timing and Synchronization Management Up-link outer loop Power Control Iub Dedicated Data transmission Balance on down-link power drifting Compressed Mode Control

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UTRAN Interfaces Protocols and Functions

Iu Interface

Iur InterfaceIub Interface Uu Interface

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Uu Interface Protocol Stack StructureC-plane signalling GC Nt DC U-plane information

Duplication avoidance GC Nt DC

L3control RRC PDCP

UuS boundary

PDCP

L2/PDCPBMC

control

control

control control

L2/BMC

RLC RLC RLC RLC RLC RLC RLC

RLC

L2/RLC

Logical Channels MAC

L2/MACTransport Channels

PHY

L1

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Uu Interface L1 Functions(1)

Multiplexing of transport channels and de-multiplexing of encoded composite channels

Mapping of encoded composite transport channels on physicalchannels

Macro-diversity distribution/combining and soft handover execution Error detection on transport