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OC Mobility Strategy OML

Jun 01, 2018

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Daud Qureshi
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    Orange MaliMobility Strategy

    April, 2010

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    Agenda

    1. 3G to 3G Cell reselection

    2. 3G to 2G Cell reselection

    3. 2G to 3G Cell reselection

    4. 3G to 2G Handover

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    3G3G Cell reselection

    All Rights Reserved © Alcatel-Lucent 2010, XXXXX

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    3G3G Cell reselection - Measurements

    3G3G Measurements will start when:

    Ec/No

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    3G3G Cell reselection – 1st Ranking

    1st ranking is performed according to following formulas:

    Rs (UMTS Serving Cell) = Ec/No (Serving Cell) +qHyst1 (Serving Cell)

    Rn (UMTS Neighbour Cell) = Ec/No (Neighbour Cell) – Qoffset1sn (Neighbour

    Cell)Gn (GSM Neighbour Cell) = RxLev – qOffset1sn (GSM Neighbour) if sSearchRatcondition is met

    All Rights Reserved © Alcatel-Lucent 2010, XXXXX

    qHyst1 (UMTS Cell parameter) = 0 dB

    qOffset1sn (UMTS Neighbour Cell parameter) = 0 dB

    qOffset1sn (GSM Neighbour Cell parameter) = 50 dB

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    3G3G Cell reselection – 2 nd Ranking

    As cell parameter QualMeas is set to qualMeasEc/No, there is a second rankingfor the UMTS cells (if no GSM cell is elected as best cell or if sSearchRatcondition is not met):

    Rs (UMTS Serving Cell) = Ec/No (Serving Cell) +qHyst2 (Serving Cell)

    Rn (UMTS Neighbour Cell) = Ec/No (Neighbour Cell) – Qoffset2sn (NeighbourCell)

    All Rights Reserved © Alcatel-Lucent 2010, XXXXX

    qHyst2 (UMTS Cell parameter) = 0 dB

    qOffset2sn (UMTS Neighbour Cell parameter) = 0 dB

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    3G2G Cell reselection

    All Rights Reserved © Alcatel-Lucent 2010, XXXXX

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    3G2G Cell reselection2G Measurements Start

    3G Parameters involved:

    sSearchRatGsm

    qQualMin

    GSM measurements will start if:

    Squal

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    3G2G Cell reselection2G Measurements Strategy

    2G Measurements will start when:

    Ec/No

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    3G2G Cell reselection2G Reselection Algorithm

    3G parameters involved:

    qRxLevMin (GSM Neighbor)

    qOffset1sn (GSM Neighbor)

    qHyst1 (UMTS Cell)

    tReselection (UMTS Cell)

    Criteria S (GSM Cell eligibility):

    RxLev (GSM) > qRxLevMin (GSM Neighbor)

    The GSM cell is reselected if the criteria S is verifiedAND the following relation is verified duringtReselection:

    RxLev (GSM) – CPICH_RSCP (UMTS) > qOffset1sn + qHyst1

    All Rights Reserved © Alcatel-Lucent 2010, XXXXX

    Orange Mali current setting:

    qRxLevMin (GSM neighbor) = -115 dBm (900MHz),

    qOffset1sn (GSM neighbor) = 50 dB

    qHyst1 (UMTS Cell) = 0 dB , tReselection (UMTS Cell) = 1 s

    => RxLev > CPICH_RSCP + 50 dB during 1 s

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    2G3G Cell reselection

    All Rights Reserved © Alcatel-Lucent 2010, XXXXX

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    2G3G Cell reselection3G Reselection Algorithm

    2G parameters involved:

    Qsearch_I

    FDD_Qmin

    FDD_QoffsetStart measuring 3G cells when the 2G cell satisfies Qsearch_I

    GSM to UMTS reselection algorithm:

    All Rights Reserved © Alcatel-Lucent 2010, XXXXX

    Ec/No (UMTS) > FDD_Qmin and

    CPICH_RSCP (UMTS) > GSMRxlev (GSM) + FDD_Qoffset during 5 seconds

    Exemple :Orange Caraïbe current setting

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    UMTS Idle

    Start measuring GSM cells if:

    In coverage: Ec/No -12 dB

    and

    3G RSCP > 2G RxLev – 4 (2G only)

    Cell reselection Algorithms

    All Rights Reserved © Alcatel-Lucent 2010, XXXXX

    GSM IdleRanking:Serving 3G RSCP + 2 dB

    Neighbour 2G RxLev - 50 dB

    - 111 dBm (900Mhz)

    Start measuring UMTS cells if:

    “Always”

    > x ev –

    coloc)

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    3G to 2G Handover

    All Rights Reserved © Alcatel-Lucent 2010, XXXXX

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    3G2G HandoverHandover Strategy

    Compress Mode is needed to measure the 2G neighbors in connected mode

    Event 2d is used to start the compress mode (3G quality becomes worst than apredefined threshold):

    cpichEcNoThresholdUsedFreq2D, cpichRscpThresholdUsedFreq2D, Timetotrigger2D

    Event 2f is used to stop the compress mode (3G quality becomes better than aredefined threshold :

    All Rights Reserved © Alcatel-Lucent 2010, XXXXX

    cpichEcNoThresholdUsedFreq2F, cpichRscpThresholdUsedFreq2F, Timetotrigger2F

    While in compress mode, the 3G 2G handover is triggered if the 2G cell has been

    measured, the BSIC has been verified and the quality of the 2G cell is betterthan a threshold:

    minimumGsmRssiValueForHO

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    3G2G HandoverCompress Mode Activation / Deactivation Mechanism

    0&22

    = f d H H

    Measurementquantity

    P CPICH 1 On this graph, forsimplification :

    f Used T 2

    TimeToTrigger2d

    Alarm criteria not hit Alarm criteria hit

    Event 2d

    All Rights Reserved © Alcatel-Lucent 2010, XXXXX

    d Used T 2

    Event 2D triggering condition:

    Time2D criteriaP CPICH 2

    2 / 22 f f Used Used H T Q +≥

    Event 2F triggering condition:

    2F criteria 2D criteria

    If 2D triggering condition is filled duringTimeToTrigger2d, the Compress Mode isactivated

    If 2F triggering condition is filled duringTimeToTrigger2f, the Compress Mode isdeactivated (if previously activated)

    2 / 22 d d Used Used H T Q −≤

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    3G2G HandoverHandover Strategy

    Orange Caraïbe current setting:

    Timetotrigger2D: 1280 ms

    TimeToTrigger2F: 1280 ms

    minimumGsmRssiValueForHO: -101 dBm

    All Rights Reserved © Alcatel-Lucent 2010, XXXXX

    3G2G is used mainly for voice services

    PS R99 traffic is very low and the HSDPA Calls remain in 3G till the drop

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    www.alcatel-lucent.com-

    All Rights Reserved © Alcatel-Lucent 2010, XXXXX

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