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    Ericsson Irat HO - Details

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    aneggaday kum
    1) Inter-system handover (IRAT HO) allows integration of GSM and WCDMA networks to provide seamless service as users move between coverage areas. 2) The IRAT HO process involves connection monitoring, compressed mode events for neighbor measurements, IRAT events to trigger the handover, and requesting the actual handover to GSM. 3) Failures can occur in the preparation, execution, or confirmation phases of IRAT HO and common causes include issues with target cell configuration, physical channel failures, or not receiving confirmations.

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    Ericsson Irat HO - Details

    Uploaded by

    aneggaday kum
    119 views14 pages
    1) Inter-system handover (IRAT HO) allows integration of GSM and WCDMA networks to provide seamless service as users move between coverage areas. 2) The IRAT HO process involves connection monitoring, compressed mode events for neighbor measurements, IRAT events to trigger the handover, and requesting the actual handover to GSM. 3) Failures can occur in the preparation, execution, or confirmation phases of IRAT HO and common causes include issues with target cell configuration, physical channel failures, or not receiving confirmations.

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    1) Inter-system handover (IRAT HO) allows integration of GSM and WCDMA networks to provide seamless service as users move between coverage areas. 2) The IRAT HO process involves connection monitoring, compressed mode events for neighbor measurements, IRAT events to trigger the handover, and requesting the actual handover to GSM. 3) Failures can occur in the preparation, execution, or confirmation phases of IRAT HO and common causes include issues with target cell configuration, physical channel failures, or not receiving confirmations.

    Copyright:

    © All Rights Reserved
    Download as PPT, PDF, TXT or read online from Scribd
    Download as ppt, pdf, or txt
    119 views14 pages

    Ericsson Irat HO - Details

    Uploaded by

    aneggaday kum
    1) Inter-system handover (IRAT HO) allows integration of GSM and WCDMA networks to provide seamless service as users move between coverage areas. 2) The IRAT HO process involves connection monitoring, compressed mode events for neighbor measurements, IRAT events to trigger the handover, and requesting the actual handover to GSM. 3) Failures can occur in the preparation, execution, or confirmation phases of IRAT HO and common causes include issues with target cell configuration, physical channel failures, or not receiving confirmations.

    Copyright:

    © All Rights Reserved
    Download as PPT, PDF, TXT or read online from Scribd
    Download as ppt, pdf, or txt
    of 14

    IRAT HO

    Definition , Why use Irat ?

    Definition:
    Inter-system handover is a Ho between GSM and WCDMA
    networks and vice versa.

    Why:
    Integrate both systems as one network and guarantee that the
    services will not be disrupted when a customer moves in the coverage
    area. The used GSM and WCDMA radio access layers need to
    integrate and operate as one seamless cellular network.

    Page 2
    Definition , Why use Irat ?
    Strategy - Example

    UTRAN

    Conected mode Idle mode GSM

    GSM_p GSM_p
    None None None None None
    referred referred

    GSM GSM GSM GSM GSM GSM GSM GSM GSM

    Page 3
    Definition , Why use Irat ?
    Irat Process

    Page 4
    Definition , Why use Irat ?
    Connection Monitoring
    - Check if current DL and UL coverage is good.

    How : Monitoring the Connection in DL and UL

    DL : CPICH Ec/No and CPICH RSCP : 2d and 2f

    UL : UE TX power : 6d and 6b

    Page 5
    Events
    Compressed Mode events
    2d event trigger:
    usedFreqThresh2dEcno+ serviceOffset2dEcno
    Or
    usedFreqThresh2dRscp+ serviceOffset2dRscp.

    2f event trigger:
    usedFreqThresh2dEcno+ serviceOffset2dEcno+ usedFreqRelThresh2fEcno
    and
    usedFreqThresh2dRscp+serviceOffset2dRscp+usedFreqRelThresh2fRscp

    6d event trigger:
    UE Tx Power reaches maximum during timeToTrigger6d
    6b event trigger:
    ueTxPowerThresh6b

    Page 6
    Events
    Compressed Mode
    Action1: UE enters
    Compressed Mode and
    starts measuring IRAT/
    IFHO neighbors

    Action2: UE exits
    Compressed Mode
    and stops measuring
    IRAT/IFHO neighbors

    1 2

    Page 7
    Events
    Irat Events

    3a event trigger:
    usedFreqThresh2dEcno+ serviceOffset2dEcno+ utranRelThresh3aEcno
    or
    usedFreqThresh2dRscp+ serviceOffset2dRscp+ utranRelThresh3aRscp

    and gsmThresh3a

    Page 8
    Events
    Irat

    Action: UE asks to perform IRAT HO on a selected GSM cell

    Page 9
    Events
    Parameters
    usedFreqThresh2dEcno-Utrancell
    serviceOffset2dEcno-UeRc
    usedFreqThresh2dRscp-Utrancell
    serviceOffset2dRscp-UeRc
    usedFreqRelThresh2fEcno-UeMeasControl
    usedFreqRelThresh2fRscp-UeMeasControl
    timeToTrigger6d-UeMeasControl
    ueTxPowerThresh6b-UeMeasControl
    timeTrigg6b-UeMeasControl
    utranRelThresh3aEcno-UeMeasControl
    gsmThresh3a-UeMeasControl

    Page 10
    Parameters
    Troubleshoot

    Phases
    - Preparation Phase

    - Execution Phase

    - Confirmation Phase

    Page 11
    Troubleshoot
    Troubleshoot

    Page 12
    Troubleshoot
    Troubleshoot
    Failures in the Preparation Phase
    Once the RNC determines that a handover to 2G is necessary, it contacts
    the 2G Network via the 3G MSC and starts a timer. If the 3G MSC comes
    back with a negative response or if the timer expires before the 3G MSC
    comes back with a response, then the handover is considered unsuccessful

    Failures in the Execution Phase


    If after receiving the handover command from the RNC the UE cannot
    make it on the 2G network, it will try come back to the 3G network and will
    advise the RNC that the handover was unsuccessful

    Failures in the Confirmation Phase


    If the RNC does not receive confirmation from the 2G network that the
    handover was successful and it does not hear back from the UE, the
    handover is considered unsuccessful (IRAT drop)

    Page 13
    Troubleshoot
    Troubleshoot
    Failures in the Preparation Phase
     Majority of Problems due to “Relocation Failure in Target CN/RNC or
    Target System”.
     Typically indicates incorrect data in external GSM table (i.e. 3G MSC
    sends a cell ID that the 2G MSC does not know about).
     For this failure, an audit of the UTRAN target GSM cell information is
    recommended.

    Failures in the Execution Phase


     Majority of the problems may be associated “Physical Channel Failures”
    and these failures could be related to:
    • Co-BCCH/BSIC ambiguity
    • Missing GSM neighbor
    • GSM NL too long (NL selection truncates important GSM neighbors)
    • GSM target cell quality degradation (degrades significantly so that
    IRAT handover was not able to complete)
    Page 14
    Troubleshoot

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