07 UMTS UTRAN Signaling Procedures

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Transcript of 07 UMTS UTRAN Signaling Procedures

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    UMTS UTRAN SignalingProcedures

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    11 UTRAN System Architecture andUTRAN System Architecture and

    Protocol StackProtocol Stack

    2 Basic Terms Related to the UTRAN2 Basic Terms Related to the UTRAN

    3 Basic Signaling Procedures3 Basic Signaling Procedures

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    UTRAN System Architecture

    RNS

    RNC

    RNS

    RNC

    Core Network

    Node B Node B Node B Node B

    Iu Iu

    Iur

    Iub IubIub Iub

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    WCDMA Protocol Architecture

    AAL5

    RANAP

    SCCP

    Relay

    RRCRLC

    MAC

    L1

    RANAPSCCP

    AAL5

    Uu IuUE RNS MSC/

    SGSN

    SignallingBearer

    RRC

    RLC

    MAC SignallingBearer

    ATM

    L1

    ATM

    SMS /GMM / MM

    SMS /GMM / MM

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    Comparison: GSM-BSS Protocol Architecture

    CM

    MM

    RR

    LAPDm

    SigL1

    L3

    L2

    L1

    MS

    RR BTSM

    LAPDm

    SigL1

    LAPD

    SigL1

    LAPD

    SigL1

    BTSM

    RR

    SCCP

    MTP

    BSSMAP

    CM

    MM

    BSSMAP

    SCCP

    MTP

    MSCBSCBTS

    Um AAbis

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    Protocol Architecture for the RNC ControlPlane

    Node B

    RNC

    CN

    UE

    RANAP

    NBAP

    RNSAPRRC

    NBAP Node B Application Part

    RANAPRadio Access Network Application PartRNSAPRadio Network Subsystem Application PartRRC Radio Resource Control

    RNC

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    Summary

    This part describes the UTRAN

    system architecture and the protocolarchitecture.

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    1 UTRAN System Architecture and1 UTRAN System Architecture and

    Protocol StackProtocol Stack

    2 Basic Terms Related to the UTRAN2 Basic Terms Related to the UTRAN

    3 Basic Signaling Procedures3 Basic Signaling Procedures

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    Basic Terms

    UTRANprovides setup, maintenance, and release of radio access

    bearer (RAB) for the Non-Access Stratum (NAS) to shield the focus of

    the NAS on the features of the radio access stratum. Other terms: UTRAN, RAB, RB, and RL

    RAB

    RB

    RLNodeB

    RNC CNUE

    UTRAN

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    Basic Terms

    RAB: The service that the access stratum provides to

    the Non-Access Stratum (NAS) for transfer of user data

    between User Equipment and CN.

    RBThe service provided by the Layer 2 for transfer of

    user data between User Equipment and SRNC.

    RL: A "radio link" is a logical association between single User

    Equipment and a single UTRAN access point. Its physical

    realisation comprises one or more radio bearer transmissions.

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    CELL_DCH CELL_FACH

    CELL_PCHURA_PCH

    IDLE

    DEAD - Searching for the network (PLMN)

    - Camp on the cell

    - Monitoring paging channel- Cell reselection

    - Dedicated channel- Radio bearers transmission servcie

    - Reducing actions, DRX, and saving power

    RRC connection

    These states are significant only forUTRAN and UE. They are transparent to

    CN.

    UE States

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    Working Modes of the UE

    The UE has two working modes: idle mode and connected mode.

    Idle mode: The UE is in the standby state and has no service for

    processing. In addition, no connection exists between the UE and

    UTRAN, and the UTRAN does not contain any information about the

    UE. The UE is identified by the NAS identifiers, such as the IMSI,

    TMSI, or P-TMSI.

    Connected mode: When the UE completes the RRC connection

    setup, the UE changes from the idle mode to the connected mode.

    In Connected mode, the UE has four states: Cell-DCH, Cell-FACH,

    Cell-PCH, and URA-PCH.

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    UE States in Connected Mode

    Cell-DCH

    The UE is in the active state. It communicates over the dedicated

    channel. The UE has a dedicated channel in both the uplink and

    downlink. The UTRAN accurately knows the cell on which the UE

    camps.

    Cell-FACH

    The UE is in the active state, but it has few data to send in both the

    uplink and downlink. It is not required to allocate a dedicated

    channel for the UE. The downlink data is transmitted over the FACH,

    and the uplink data is transmitted over the RACH. The UE needs to

    monitors the FACH in the downlink at any time for its information.

    The UTRAN accurately knows the cell on which the UE camps and

    maintains the resources for the UE and its state.

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    UE States in Connected Mode

    Cell-PCH

    The UE has no data to send in the uplink and downlink. It needs to

    monitor the PICH for receiving paging messages. Therefore, the UE

    enters the discontinuous reception, which saving the power.

    The UTRAN knows which cell that the UE camps on. Thus, after the

    UE roams to another cell, the UTRAN needs to update the cell

    information of the UE.

    URA-PCH

    The UE has no data to send in the uplink and downlink. It needs to

    monitor the PICH and enters the discontinuous reception. The

    UTRAN knows only the UTRAN registration area (URA) of the UE. AURA contains multiple cells. That is, the UTRAN updates the

    location information only after the URA where the UE is located

    changes, thus saving resources and reducing signaling.

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    Serving RNC and Drift RNC

    In the WCDMA system, the SRNC and DRNC are introduced due to the Iur interface.

    The SRNC and DRNC correspond to a specific UE.

    For connections between a UE and the CN, the RNC that is directly connected the CN

    and controls all resources of the UE is called the SRNC. The RNC that has no direct

    connection with the CN and only provides resources for the UE is called DRNC.

    A UE in connection state has at least one and only one SRNC, but can have no or

    multiple DRNCs.

    CN

    SRNC DRNC

    IuIur

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    CRNC

    The controller RNC (CRNC) corresponds to a NodeB or cell.

    The RNC that is directly connected to a NodeB and controls the

    usage of resources of the NodeB is called the CRNC.

    A NodeB corresponds to one and only one CRNC.

    The CRNC allocates the resources of all the NodeBs controlled by

    the CRNC properly.

    Iub

    Node B

    Cell Cell Cell

    Node B

    ...

    Iu

    CRNC

    CN

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    Summary

    This part describes some

    terms related to the UTRAN.

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    1 UTRAN System Architecture and1 UTRAN System Architecture and

    Protocol StackProtocol Stack

    2 Basic Terms Related to the UTRAN2 Basic Terms Related to the UTRAN

    3 Basic Signaling Procedures3 Basic Signaling Procedures

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    Basic Signaling Procedures

    System InformationSystem Information

    BroadcastingBroadcasting

    PagingPaging

    Paging ProcedurePaging Procedure

    HandoverHandover

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    System Information BroadcastingSystem Information Broadcasting

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    Overview of the System InformationOverview of the System InformationMIB: includes the PLMN identifier and the scheduling information of the schedule block (SB) and

    system block (SB).SB1: includes the scheduling information of the SIB.

    SB2 : includes the scheduling information of the SIB.

    SIB1: includes the UE timers and counters and the system information at the NAS.

    SI