W(Level1) UMTS UTRAN Signaling Procedures 20050614 a 1[1].0

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Transcript of W(Level1) UMTS UTRAN Signaling Procedures 20050614 a 1[1].0

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    Wireless Curriculum Development Section

    ISSUE

    UMTS UTRAN Signaling Procedures

    1.0

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    Confidential Information of Huawei.

    No Spreading without Permission. Security Level: Internal

    Course Contents

    Chapter 1 UTRAN Network Overview

    Chapter 2 Basic Signaling Process

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    No Spreading without Permission. Security Level: Internal

    UTRAN Overview

    UE Working Mode and State

    Serving RNCDrift RNC and Control RNC

    Source RNC and Target RNC

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    Confidential Information of Huawei.

    No Spreading without Permission. Security Level: Internal

    UE Working Modes and states

    Idle Mode

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

    a signalling 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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    No Spreading without Permission. Security Level: Internal

    UE Working Modes and states

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

    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 ondifferent 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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    UE Working Modes and states

    Cell-DCH

    In active state

    Communicating via its dedicated channels

    UTRAN knows which cell UE is in.

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    No Spreading without Permission. Security Level: Internal

    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 cell

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    URA-PCH State

    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 update UE information only after UE has roamed to

    other URA.

    A better way to lower 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 Signaling

    trigger (CN)

    - Reduce actionDTXand save power

    RRC connect ion

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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 CRNC

    Drift RNSs support the Serving RNS 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 DRNCIu Iur

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    No Spreading without Permission. Security Level: Internal

    CRNC

    The CRNC owns the radio resources of a cell

    Dynamical control of power for dedicated channels, within

    limits admitted by 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

    CRNC

    Iub

    Node B

    Cell Cell Cell

    Node B

    ...

    CN

    Iu

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    No Spreading without Permission. Security Level: Internal

    Source RNC/Target RNC

    The SRNS Relocation function coordinates the activities when the

    SRNS role is to be taken over by another RNS.

    Source RNC is the SRNC before SRNs Relocation and Target

    RNC is the SRNC after SRNs Relocation

    CNCN

    Source

    RNCTarget

    RNC

    Serving

    RNC

    Iu Iu

    Iur RNC

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    No Spreading without Permission. Security Level: Internal

    Course Contents

    Chapter 1 UTRAN Network Overview

    Chapter 2 Basic Signaling Process

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    No Spreading without Permission. Security Level: Internal

    Basic Signaling Procedures

    2.1 Call overall process

    2.2 Network start process

    2.3 UE registration process

    2.4 Call process

    2.5 Connection mobility management process

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    Call overall Procedures

    Network side Start

    1Initialize equipment2Process system

    broadcast

    Step 1

    Handset Power on

    1cell reselection2

    Location registration3Waiting for call

    Step 2

    Paging UE

    Step 3

    RRC connection

    Establish

    Step 4

    NAS signaling

    connection establish

    Step 5

    RAB set up

    1synchronous set up2asynchronous set up

    Step 6

    RAB/RB modification

    Step 6

    Transport channel

    reconfiguration

    Step 6

    Physical channel

    reconfiguration

    Step 6

    Soft/hard handover

    Step 6

    URA update

    Step 6

    Cell update

    Step 6

    Handover with GSM

    Step 7

    RRC connection

    release

    Step 8

    Waiting for call again

    1cell selection2wait for call

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    No Spreading without Permission. Security Level: Internal

    Basic Signaling Procedures

    2.1 Call overall process

    2.2 Network start process

    2.3 UE registration process

    2.4 Call process

    2.5 Connection mobility management process

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    No Spreading without Permission. Security Level: Internal

    System Information Broadcast Flow

    .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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    Confidential Information of Huawei.

    No Spreading without Permission. Security Level: Internal

    Basic Signaling Procedures

    2.1 Call overall process

    2.2 Network start process

    2.3 UE registration process

    2.4 Call process

    2.5 Connection mobility management process

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