layering strategy and mobility handling

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Layering Strategy and Mobility Handling

NSN NPO team

2nd August 2011

Prepared By: Mohab Alaa



2 © Nokia Siemens Networks

CONTENTS

Mobility with DC-HSDPA layer

Layering strategy and traffic balancing




Mobility and Handover Strategy

U2100 – F2

U2100 – F1

U900

U900

SITE A

U2100 – F2

U2100 – F1

U900

U2100 – F2

U2100 – F1

U900

U2100 – F2

U2100 – F1SITE B

U2100 – F2

U2100 – F1

U900

CELL 1

CELL 3 CELL 2

CELL 1

CELL 3 CELL 2

U2100-U2100

U900-U900

U900-U2100

U2100-U900

Not Allowed

GSM (SITE A) GSM (SITE A) GSM (SITE B)

GSM-GSM

GSM-U900

GSM-U2100




Mobility and Handover Strategy

• U900 from Site B not to be defined as Neighbors to U2100 F1 & U2100 F2 of Site

A. Only Intra Site U900 to U2100 to be defined.

• U2100 are defined to the GSM only for Intra Site only.

• GSM Neighbors (900 & 1800) are defined to U2100 but for 1st tier only.

• U2100 From Site B to be defined as Neighbours to U2100 of Site A, Only if Site B

is in the 1st tier of Site A.




CONTENTS

Mobility with DC-HSDPA layer

Layering strategy and traffic balancing




Layering strategy (I)

Qqualmin= -18dB

Qrxvlevmin= -93dBm

Sintersearch = -8 dB

SsearchRAT= -12 dB

HHoEcNoThreshold/Cancel = -12/-9

HHoRSCPThreshold/Cancel = -93/-89

IFHO Triggering causes: RSCP, DL Tx Pwr, UL Tx Pwr

Qqualmin= -18 dB

Qrxvlevmin= -115 dBm


SsearchRAT= -14 dB

HHoEcNoThreshold/Cancel = -12/-9 RT, -16/-12 NRT

HHoRSCPThreshold/Cancel = -105/-99 RT, -112/-109 NRT

IFHO Triggering causes: None

f2(DC HSDPA/HSUPA/F-DPCH)

f1(R99/HSDPA/HSUPA)

DirectedRRCEnabled : Enabled

DRRC for HSDPA Layer : Enabled

DirectedRRCForHSDPALayerEnhanc : Enabled

HSDPALayeringCommonChEnabled: Enabled

DRRCForHSDPALayerServices : Interactive, Background,Inter-RAT, Registration, High Priority Sig.

f3 (DC HSDPA/HSUPA/F-DPCH)

f1(R99/HSDPA/HSUPA) f1(R99/HSDPA/HSUPA)

UEs is Freely camping,and can move from F1to F2 or F3 using the

DRRC Features

U900_F1

U2100_F2

U2100_F3

2Cells of:

- Adj UARFCN.

– The same sector id.

– The same Tcell.

- DCellHSDPAEnabled=1

Dual Cell


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Layering strategy (II)

Qqualmin= -18dB

Qrxvlevmin= -93dBm


SsearchRAT= -12 dB

HHoEcNoThreshold/Cancel = -12/-9

HHoRSCPThreshold/Cancel = -93/-89

IFHO Triggering causes: RSCP, DL Tx Pwr, UL Tx Pwr

Qqualmin= -18 dB

Qrxvlevmin= -115 dBm


SsearchRAT= -14 dB

HHoEcNoThreshold/Cancel = -12/-9 RT, -16/-12 NRT

HHoRSCPThreshold/Cancel = -105/-99 RT, -112/-109 NRT

IFHO Triggering causes: None

f2(R99/HSDPA/HSUPA/)

f1(R99/HSDPA/HSUPA)

DirectedRRCEnabled : Enabled

DRRC for HSDPA Layer : Enabled

DirectedRRCForHSDPALayerEnhanc : Enabled

HSDPALayeringCommonChEnabled: Enabled

DRRCForHSDPALayerServices : Interactive, Background,Inter-RAT, Registration, High Priority Sig.

f1(R99/HSDPA/HSUPA) f1(R99/HSDPA/HSUPA)U900_F1

U2100_F2

GSM GSM GSMGSM_F0

FddQMin= -10 dB

FddRscpMin= -100 dBm

MinEcNoThr= -15 dB

QSearchI= 7

QSearchP= 7

ISHO Triggering causes: EcNo, RSCP



Layering strategy & Load Balancing

• 3G is having higher priority than 2G, so the UE in 2G is always searching for a good 3Gcandidate to reselect (QSearchI & QSearchP =7) according to the EcNo and RSCPthresholds defined.

•

U900 Neighbors are defined to the 2G cells for the reselection and ISHO, and U2100Neighbors are only defined to the Intra site 2G cells.

• ISHO from 2G to 3G is according to the EcNo & RSCP(License).

• UE in 3G is Freely camping, and can move from F1 to F2 or F3 using the DRRC Features.

• If there are several possible target cells, the load balancing between the target cells is basedon existing HSDPA load balancing approach.

• (HSDPALayerLoadShareThreshold) is the RNC Parameter used to define the threshold(number of HSDPA users) for load sharing between HSDPA layers.

• Before the threshold is reached in any of the cells in the same sector, the HSDPA UEs thatare establishing the RRC connection and changing the state from Cell_FACH to Cell_DCHare directed to same layer. This is done by comparing the cell weights. UEs is directed to thecell that has the greatest cell weight. If the cell weights are equal, the UEs are directed to thecell that has the Least number of HSDPA users.

• When the threshold is reached in any of the cells in the same sector, the HSDPA loadsharing between layers is done. The load sharing decision making is based on the weight

(CellWeightForHSDPALayering ) or Based on weight and power, but we disabled the power (DisablePowerInHSDPALayeringDecision).



THANK YOU

layering strategy and mobility handling

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