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Page 1: OC Mobility Strategy OML

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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

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3G3G Cell reselection - Measurements

3G3G Measurements will start when:

Ec/No <= sIntraSearch + qQualMin

Orange Mali current setting

3G3G measurement starts when:

= = -

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i.e. Ec/No <= -8 dB

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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

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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)

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qHyst2 (UMTS Cell parameter) = 0 dB

qOffset2sn (UMTS Neighbour Cell parameter) = 0 dB

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3G2G Cell reselection

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3G2G Cell reselection2G Measurements Start

3G Parameters involved:

sSearchRatGsm

qQualMin

GSM measurements will start if:

Squal <= sSearchRatGsm

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with Squal = qQualMeas (Ec/No measured) – qQualMin (min Ec/No target)

SIntraSearch

SInterSearch

SInterRAT

SQual

sSearchRatGSM

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3G2G Cell reselection2G Measurements Strategy

2G Measurements will start when:

Ec/No <= sSearchRatGsm + qQualMin

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qQualMin = -16 dB and sSearchRATGsm = 4 dB , i.e. Ec/No <= -12 dB

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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

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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

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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:

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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 <= -14 dB

Eligibility:

Reselection if:Ec/No > -12 dB

and

3G RSCP > 2G RxLev – 4 (2G only)

Cell reselection Algorithms

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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

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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 :

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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

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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

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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-

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