WCDMA UTRAN Interface and Signaling Procedure ISSUE 11

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    Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

    WCDMA UTRANInterface andSignalingProcedure

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    Objectives

    Upon completion of this course, you will be able to:

    Understand UTRAN interface and structure

    Understand the definitions about UTRAN network elements

    Understand UTRAN signaling procedure

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    Contents

    1. UTRAN Network Overview

    2. Basic Concepts about UTRAN

    3. UTRAN Signaling Procedure

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    Contents

    1. UTRAN Network Overview

    2. Basic Concepts about UTRAN

    3. UTRAN Signaling Procedure

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    The Position of UTRAN in WCDMANetwork

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    UMTS Construction

    UTRAN UMTS Terrestrial Radio Access NetworkCN Core NetworkUE User Equipment

    Iu

    UTRAN

    UEUu

    CN

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    UMTS Structure

    RNS

    RNC

    RNS

    RNC

    Core Network

    Node B Node B Node B Node B

    Iu Iu

    Iur

    Iub IubIub Iub

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    Uu Interface

    L3

    contro

    l

    contro

    l

    contro

    l

    LogicalChannels

    TransportChannels

    C-plane signalling U-plane information

    PHY

    L2/MAC

    L1

    RLC

    DCNtGC

    L2/RLC

    MAC

    RLCRLCRLC

    RLC

    RLCRLC

    RLC

    Duplication avoidance

    UuS boundary

    BMC L2/BMC

    control

    PDCPPDCP L2/PDCP

    DCNtGC

    RadioBearers

    RRC

    contro

    l

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    General Protocol Mode for UTRAN

    Terrestrial Interface The structure is based on the principle that the layers and

    planes are logically independent of each other.

    ApplicationProtocol DataStream(s)

    ALCAP(s)

    TransportNetwork

    Layer

    Physical Layer

    SignallingBearer(s)

    TransportUser

    NetworkPlane

    Control Plane User Plane

    TransportUser

    NetworkPlane

    Transport NetworkControl Plane

    RadioNetwork

    Layer

    SignallingBearer(s)

    DataBearer(s)

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    RNL Control Plane ApplicationProtocol

    NBAPNode B Application PartRANAPRadio Access Network Application PartRNSAPRadio Network Subsystem Application PartRRC Radio Resource Control

    Node B

    RNC

    CN

    UE

    RANAP

    NBAP

    RNSAPRRCRNC

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    Iu-CS Interface

    Q.2150.1

    Q.2630.1

    RANAPIu UP Protocol

    Layer

    TransportNetwork

    Layer

    Transport NetworkUser Plane

    Control Plane User Plane

    Transport NetworkUser Plane

    Transport NetworkControl Plane

    RadioNetwork

    Layer

    SSCOP

    AAL5

    SSCOP

    SSCF-NNI

    AAL2AAL5

    MTP3bMTP3b

    SCCP

    SSCF-NNI

    Physical Layer

    ATM

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    Iu-PS Interface

    SSCF-NNI

    SSCOP

    AAL5

    IP

    SCTP

    SCCP

    SSCF-NNI

    MTP3-B

    M3UA

    Physical Layer

    Control Plane User Plane

    ATM

    AAL5

    IP

    UDP

    GTP-U

    Physical Layer

    ATM

    Transport

    Network

    Layer

    Transport NetworkControl Plane

    Radio

    Network

    Layer

    RANAP Iu UP ProtocolLayer

    Transport NetworkUser Plane

    Transport NetworkUser Plane

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    Iub Interface

    Node BApplication Part

    (NBAP)

    AAL Type 2

    ALCAP

    TransportLayer

    RadioNetwork

    Layer

    Radio NetworkControl Plane

    TransportNetwork

    Control Plane

    DCHFP

    RACHFP

    ATM

    DSCHFP

    AAL Type 5

    User Plane

    SSCF-UNI

    SSCOP

    AAL Type 5

    SSCF-UNI

    SSCOP

    Q.2630.1

    Q.2150.2

    FACHFP

    PCHFP

    USCHFP

    CPCHFP

    Physical Layer

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    Iur Interface

    SSCF-NNI

    SSCOP

    MTP3-B

    AAL5

    IP

    SCTP

    SCCP

    AAL5

    STC (Q.2150.1)

    RNSAPIur Data

    Stream(s)

    Physical Layer

    Control Plane User Plane

    ATM

    ALCAP(Q.2630.1)

    AAL2

    SSCF-NNI

    SSCOP

    MTP3-B

    IP

    SCTP

    M3UAM3UA

    Transport

    Network

    Layer

    Transport NetworkControl Plane

    Radio

    NetworkLayer

    Transport NetworkUser Plane

    Transport NetworkUser Plane

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    Contents

    1. UTRAN Network Overview

    2. Basic Concepts about UTRAN

    3. UTRAN Signaling Procedure

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    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 DRNC

    Drift RNCs support the Serving RNC 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 DRNC

    IuIur

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    CRNC

    The CRNC owns the radio resources of a cell

    Dynamical control of power for dedicated channels, within limits admittedby 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

    Iub

    Node B

    Cell Cell Cell

    Node B

    ...

    Iu

    CRNC

    CN

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    RAB, RB and RL

    RAB

    RB

    RLNodeB

    RNC CNUE

    UTRAN

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    UE Working Modes and States

    Idle mode

    Connected mode

    Cell_DCH

    Cell_FACH

    Cell_PCH

    URA_PCH

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    Idle Mode

    The UE has no relation to UTRAN, only to CN. For data transfer, asignalling 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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    Connected Mode

    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 on

    different 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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    Connected Mode

    Cell-DCH

    In active state

    Communicating via its dedicated channels

    UTRAN knows which cell UE is in.

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    Connected Mode

    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.

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    Connected Mode

    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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    Connected Mode

    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 updates UE information only after UE has roamed to

    other URA.

    A better way to reduce the resource occupancy and signaling

    transmission

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    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 Signalingtrigger (CN)

    - Reduce actionDTXand save power

    RRC connection

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    RNTI - Radio Network TemporaryIdentifier Five Types of RNTI exist

    Serving RNC RNTI (S-RNTI)

    Drift RNC RNTI (D-RNTI)

    Cell RNTI (C-RNTI)

    UTRAN RNTI (U-RNTI)

    HS-DSCH RNTI (H-RNTI)

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    Contents

    1. UTRAN Network Overview

    2. Basic Concepts about UTRAN

    3. UTRAN Signaling Procedure

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    Contents

    3. UTRAN Signaling Procedure

    3.1 Cell Setup

    3.2 System Information Broadcast

    3.3 Paging

    3.4 Call Process

    3.5 Handover

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    Cell Setup

    NBAP

    NBAP

    NBAP

    NBAP

    NBAP

    NBAP

    NBAP

    NBAP

    NBAP

    NBAP

    NCP: Resource Status Ind

    NCP: Audit Req

    NCP: Cell Setup Req

    NCP: Cell Setup Rsp

    NBAPNBAP NCP: Comm TrCh Setup Req

    NBAPNBAP NCP: Comm TrCh Setup Rsp

    Q.AAL2

    Q.AAL2

    Q.AAL2

    Q.AAL2

    Est Req

    Est Conf

    RNC NodeB

    NCP: Audit Rsp

    NBAPNBAP NCP: Comm TrCh Setup Req

    NBAPNBAP NCP: Comm TrCh Setup Rsp

    Q.AAL2

    Q.AAL2

    Q.AAL2

    Q.AAL2

    Est Req

    Est Conf

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    Contents

    3. UTRAN Signaling Procedure

    3.1 Cell Setup

    3.2 System Information Broadcast

    3.3 Paging

    3.4 Call Process

    3.5 Handover

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    System Information BroadcastFlow

    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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    Introduction of System Information

    MIBContains PLMN tag and SB (scheduling information block) or thescheduling information for SIB (system info block)

    SB1Contains scheduling information for SIB

    SB2Contains scheduling information for SIB

    SIB1Contains the system information for NAS and the timer/counter for UE

    SIB2

    Contains the URA informationSIB3

    Contains the parameters for cell selection and cell re-selection

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    Introduction of System Information

    SIB4Contains parameters for cell selection and cell re-selection while UE is inconnecting mode

    SIB5Contains parameters for the common physical channels of the cell

    SIB6Contains parameters for the common physical channels of the cell whileUE is in connecting mode

    SIB7Contains the uplink interference level and the refreshing timer for SIB7

    SIB8Contains the CPCH static information

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    Introduction of System Information

    SIB9Contains the CPCH dynamic information

    SIB10Contains information to be used by UEs having their DCH controlled by aDRAC procedure

    Used in FDD mode onlyTo be used in CELL_DCH state onlyChanges so often, its decoding is controlled by a timer

    SIB11Contains measurement controlling information

    SIB12Contains measurement controlling information in connecting mode

    SIB13Contains ANSI-41 system information

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    Introduction of System Information

    SIB14:Contains the information in TDD mode

    SIB15:Contains the position service information

    SIB16:Contains the needed pre-configuration information for handover fromother RAT to UTRAN

    SIB17:Contains the configuration information for TDD

    SIB18:Contains the PLMN identities of the neighboring cellsTo be used in shared networks to help with the cell reselection process

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    System Information Block Type 1

    System information type 1 The NAS system information

    CS domain DRXK 6then

    DRX period is 2^k = 2 ^ 6 = 64

    TTI = 640 ms

    PS domain DRXK 6then

    DRX period is 2^k = 2 ^ 6 = 64

    TTI = 640 ms

    The different timers for UE inconnecting mode and idle mode.

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    System Information Block Type 2

    System info type 2

    URA information

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    System Information Block Type 3

    The references for cellselection and re-selection

    Qhyst2s

    Sintrasearch Sintersearch

    SinterRatsearch

    Qqualmin

    Qrxlemin

    T reselection

    Max Allowed UE TX power

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    System Information Block Type 5

    The configuration

    information for the following

    physical channels and the

    counterpart transport

    channels

    PICH

    AICH

    PCCPCH PRACH

    SCCPCH

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    System Information Block Type 7and 11 System info type 7

    Including the UL interference level which is used for open loop

    power control:

    Preamble_Initial_Power=Primary CPICH DL TX power -

    CPICH_RSCP + UL interference + Constant Value

    Including the Expiration Time Factor which is used for

    refreshing the SIB7 periodically

    System info type 11 The neighbor cell information for cell re-selection in IDLE mode.

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    Contents

    3. UTRAN Signaling Procedure

    3.1 Cell Setup

    3.2 System Information Broadcast

    3.3 Paging

    3.4 Call Process

    3.5 Handover

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    Paging Caused by CN

    The paging information type which is sent by UTRAN is

    decided by UE mode.

    If UE is in the CELL_FACH or CELL_DCHUTRAN send

    paging type 2. In other modes, the paging information istype 1 and UE can use DTX method to detecting PICH.

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    Paging Caused by UTRAN

    UE RNC1NodeB1

    RRCPagingType1RRC

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    Contents

    3. UTRAN Signaling Procedure

    3.1 Cell Setup

    3.2 System Information Broadcast

    3.3 Paging

    3.4 Call Process

    3.5 Handover

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    Introduction of Call Process

    In WCDMA system, a call process includes the following basicsignaling flows:

    RRC connection flow

    Iu interface signaling flow

    Authentication flow (optional) Security flow (optional)

    RAB establish flow

    Call proceeding

    NAS signaling before correlative bearer release

    Correlative bearer release

    RRC Connection Establishment Flow

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    RRC Connection Establishment Flow(DCH)

    When UE is in IDLE mode and the NAS of UE request the signaling connection, UE will send a RRC Connection

    Request. Each UE only can have on RRC Connection. The main function is to configure the signaling channel of

    UTRAN.

    1. CCCH: RRC Connection Request

    5. Downlink Synchronisation

    UE

    Node B

    Serving RNS

    Serving

    RNC

    DCH - FP

    Allocate RNTISelect L1 and L2parameters

    RRCRRC

    NBAPNBAP

    3. Radio Link Setup Response

    NBAPNBAP2. Radio Link Setup Request

    RRCRRC7. CCCH: RRC Connection Set up

    Start RXdescription

    Start TXdescription

    4. ALCAP Iub Data Transport Bearer Setup

    RRCRRC9. DCCH: RRC Connection Setup Complete

    6. Uplink Synchronisation

    NBAPNBAP8. Radio Link Restore Indication

    DCH - FP

    DCH - FP

    DCH - FP

    I I t f Si li C ti

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    Iu Interface Signaling ConnectionEstablish

    In Iu interface, radio network layer reports the

    RANAP information and NAS information. NAS

    information is taken as directed message in RANAP

    information.

    And the process of Iu signaling connection is to

    establish the Iu interface connection of SCCP

    between RNC and CN.

    UE Node B RNC CN

    RRC RRC

    SCCP SCCP

    SCCP SCCP

    Initial DT

    Initial UE message (ConnectRequest)

    Connect Confirm

    RANAP

    Transport NetworkUser Plane

    Control Plane

    SSCOP

    AAL5

    MTP3b

    SCCP

    SSCF-NNI

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    Authentication and Security FlowUE RNC CN

    RRC Connection Setup

    Initial DTInitial UE Message

    DL DT (Authentication

    Request)DL DT (AuthenticationRequest)

    DL DT (AuthenticationRequest) DL DT (Authentication

    Request)

    Common ID

    Security Mode CommandSecurity Mode Command

    Security Mode Command

    Security Mode Command

    RAB Assignment

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    Common ID

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    RAB Establishment FlowNodeBUE CNRNC

    RANAPRANAPRAB Ass Req

    Q.AAL2 Q.AAL2

    Q.AAL2Q.AAL2

    NBAPNBAP

    AAL2 Setup Req

    RL Recfg Prep

    AAL2 Setup Rep

    NBAPNBAPRL Recfg Ready

    Q.AAL2Q.AAL2AAL2 Setup Req

    Q.AAL2Q.AAL2AAL2 Setup Rep

    FPFPDL Sync

    FPFPUL Sync

    RRC RRCRB Setup

    NBAPNBAPRL Recfg Commit

    RRC RRCRB Setup Complete

    RANAPRANAPRAB Ass Rep

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    NAS Signaling (CS)

    UE Terminating Call

    UE MSC

    CM Service Request

    RRC and NAS signaling Connection Setup

    Authentication Request

    Authentication Response

    Security Mode Command

    Security Mode Command

    RAB Assignment

    Setup

    Call Proceeding

    Alerting

    Connect

    Connect ACKDisconnect

    Release

    Release Complete

    UE Outgoing Call

    UE MSC

    Paging Response

    Authentication Request

    Authentication Response

    Security Mode Command

    Security Mode Command

    RAB Assignment

    Setup

    Call Confirmed

    Alerting

    Connect

    Connect ACK

    Disconnect

    Release

    Release Complete

    Paging

    RRC and NAS signaling Connection Setup

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    NAS Signaling (PS)UE MSC

    CM Service Accept

    Service Request

    RRC

    Activate PDP Context Req

    Activate PDP Context Accept

    RAB

    Deactivate PDP Context Req

    Deactivate PDP Context Accept

    UE Outgoing Call

    UE MSC

    Service Request

    RRC

    Request PDP Context Activation

    Activate PDP Context Req

    RAB

    UE Terminating Call

    Paging

    Authenticate and ciphering Req

    Authenticate and ciphering Rsp Authenticate and ciphering Req

    Authenticate and ciphering Rsp

    Activate PDP Context Accept

    Deactivate PDP Context Req

    Deactivate PDP Context Accept

    SGSN SGSN

    RRC connection and NAS signalingconnection establishment RRC connection and NAS signaling

    connection establishment

    Security Mode

    Security Mode

    RAB establishment

    RAB establishment

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    UE to UE (1)Ori UE Ter UENodeB1 NodeB2RNC1 CN RNC2

    1.RRC Connect Setup Req

    2.RL Setup Req

    3.RL Setup Rsp

    4.AAL2 Setup Req

    5.AAL2 Setup Rsp

    6.DL Sync

    7.UL Sync

    8.RRC Connect Setup

    9.RRC Connect Setup Cmp

    10.Initial DT

    11.InitUE(CM

    ServiceReq)

    12.DT(AuthenticaReq)

    15.DT(Authentica

    Rsp)

    13.DL DT

    14.UL DT

    RANAP

    RRCRRC

    NBAPNBAP

    NBAPNBAP

    Q.AAL2Q.AAL2

    Q.AAL2Q.AAL2

    FPFP

    FPFP

    RRCRRC

    RRCRRC

    RRCRRC

    RANAP

    RANAP RANAP

    RRC RRC

    RRCRRC

    RANAP RANAP

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    UE to UE (5)Ori UE Ter UENodeB1 NodeB2RNC1 CN RNC2

    RANAP RANAP64.RAB Ass Req

    NBAPNBAP

    70.RL Recfg

    ReadyNBAPNBAP

    69.RL RecfgPrep

    Q.AAL2 Q.AAL2

    72.AAL2

    Setup RspQ.AAL2 Q.AAL2

    71.AAL2

    Setup Req

    FPFP 73.DL Sync

    FPFP 74.UL Sync

    RRC RRC75.RB Setup

    Q.AAL2 Q.AAL265.AAL2 Setup

    Req

    Q.AAL2 Q.AAL266.AAL2 Setup

    ConfFPFP 67.DL Sync

    FPFP 68.UL Sync

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    UE to UE (6)Ori UE Ter UENodeB1 NodeB2RNC1 CN RNC2

    NBAPNBAP76.RL Rcfg

    Commit

    RRC RRC77.RB Setup Complete

    RANAP RANAP78.RAB Ass

    Rsp

    RRC RRC79.UL DT

    RANAP RANAP80.DT(Alerti

    ng)

    RANAP RANAP81.DT(Alerting)

    RRC RRC82.DL DT

    RRC RRC83.UL DT

    RANAP RANAP84.DT(Connec

    t)

    RANAP RANAP85.DL

    DT(Connect)

    RRC RRC86.DL DT

    RRC RRC87.UL DT

    RANAP RANAP

    RANAP RANAP

    RRC RRC

    88.UL DT

    89.DT(Connec

    t Ack)

    90.DL DT

    Alerting

    Connect

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    Contents

    3. UTRAN Signaling Procedure

    3.1 Cell Setup

    3.2 System Information Broadcast

    3.3 Paging

    3.4 Call Process

    3.5 Handover

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    Concepts about Soft Handover

    Soft handover: the signals from different NodeBs are merged inRNC.

    Softer handover: the signals from different cells, but from the

    same NodeB are merged in NodeB.

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    Node B

    RNC

    AirBridge

    AirBridge

    AirBridge

    Soft Handover Flow

    Core Network

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    Node B

    RNC

    AirBridge

    AirBridge

    AirBridge

    Merged in NodeB

    Soft Handover Flow

    Core Network

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    Merged in RNC

    Node B

    RNC

    AirBridge

    AirBridge

    AirBridge

    Soft Handover Flow

    Core Network

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    Soft Handover Flow (SRNC-DRNC)

    Merged in SRNC

    Node B

    AirBridge

    AirBridge

    AirBridge

    Serving RNC

    Drift RNC

    Core Network

    Soft Handover Flow (SRNC

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    Soft Handover Flow (SRNCRelocation)

    Node B

    AirBridge

    AirBridge

    AirBridge

    Serving RNC

    RNC

    Core Network

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    Before Handover After Handover

    SRNC

    NodeBNodeB

    SRNC

    NodeBNodeB

    SRNC

    NodeBNodeB

    During Handover

    Soft Handover FlowIntra-RNC

    CNCN CN

    Soft Handover FlowAdd Branch

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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

    NBAP

    2. 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 RX description

    RRC

    RRC

    RRC

    RRC

    Soft Handover FlowAdd Branchin RNC

    Soft Handover FlowDel 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

    Soft Handover FlowDel Branchin RNC

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    Before Handover After Handover

    Radio Link can not exist simultaneously

    SRNC

    NodeBNodeB

    SRNC

    NodeBNodeB

    Hard Handover (Intra-RNC)

    CNCN

    C

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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 ub Data Transport Bearer Setup

    7. Radio Link Failure IndicationRRCRRC

    NBAPNBAP

    NBAP

    RRCRRC

    NBAP

    NBAP

    NBAP NBAP

    Decide to

    handover

    Start Rx

    Start Tx

    DCH-FP4. Downlink SynchronisationDCH-FP

    DCH-FP5.Uplink SynchronisationDCH-FP

    NBAP

    NBAP

    NBAP

    11. ALCAP Iub Data Transport Bearer Release

    Hard Handover (Intra-RNC)

    SRNC R l i

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    SRNC Relocation

    SRNS

    Core Network

    Iu

    DRNSIur

    UE

    RNS

    Core Network

    Iu

    SRNS

    UE

    After SRNS RelocationBefore SRNS Relocation

    Cells

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    Inter-System Handover Flow

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    Inter-System Handover Flow

    UMTS->GSMUE NodeB RNC 3G MSC 2G MSC BSS

    Measurement Report(2D)

    RL Recfg Prep

    RL Recfg Ready

    Physical Channel Reconfiguration

    RL Recfg Commit

    Physical Channel Reconfiguration cmp

    Measurement Control(InterRAT)

    Measurement Report(GSM)

    Relocation Required

    Relocation Command

    Prepare Handover

    Handover Request

    Handover Request ACK

    Prepare Handover RSP

    Handover From UTRAN CMD

    Handover Complete

    IU release command

    IU release complete

    RRC Con Release Req

    RRC Con Release Cmp

    RL Del Req

    RL Del Rsp

    Inter-System Handover Flow

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    Inter-System Handover Flow(GSM-UMTS)

    UE NodeB RNC 3G MSC 2G MSC BSS

    RL setup requeset

    RL setup response

    RL Restore Indicaton

    Handover Complete

    UTRAN Capacity Info

    UE Capacity Info Enquiry

    Relocation Requeset

    Prepare Handover

    Handover Request

    Handover Command

    Send end signal

    requeset

    Inter System to UTRAN Ho cmd (Handover to UTRAN Command)

    Clear command

    Clear complete

    UTRAN Capacity Info Confirm

    UE Capacity Info Confirm

    Relocation Requeset

    ACKPrepare Handover RSP

    Relocation Complete

    Send end signal

    responseUE Capacity Info

    F d H d

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    Forward Handover

    Forward Handover is sponsored by UE, including cellupdate and URA update. URA update is only used to make

    the URA re-selection for the UE which is in URA_PCH state,

    and check the RRC connection.

    S

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    Summary

    This chapter mainly explains the basic signaling flow inUTRAN. This is very helpful for the CN signaling flow.

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