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A Three-Step Approach toCDMA2000 Network Capacity

Enhancement

Dr. Joseph ShapiraCEO

Celletra Ltd.

Presentation atCDG Technology Forum

San Francisco, October 1, 2002

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Contents

• Capacity limits and the optimization process

• Transmit Diversity

• CellShaper

• The “Smart cluster”

• 3 steps migration

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CDMA linksare not symmetrical

Expands when loadedShrinks when loadedCell boundary

Limited dynamic rangeHigh dynamic rangePower control

BTS powerUser’s powerCoverage limit

Power. Coveragematching to up link

Interference.System instability

Capacity limit

Forward linkReverse Link

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Network Optimization/Capacity Maximization Process

Improve the channel – reducerequired Eb/Io margin

– Receive diversities– Transmit diversities

Reduce SHO overhead

– beam shape and tilt– back off pilot

Balance the loads/ manage sectorresources

– Intersector balance– Intercell balance

Smart Antenna

– Optimize the channelper user

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Transmit Diversity

Rx Diversity

MS

ΣΣΣΣ TDU

Tx Diversity

MS

Transmit Diversity in IS95, and in CDMA2000, is “blind”

There is no feedback from the MS on the optimal signals’ conditioning forcombining

Tx power is split between two spaced antennas, and “colored” soas to be differentiated and optimally combined at the MS

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Transmit Diversity Techniques cdmaOne and CDMA2000

TDTD (Time Delay TD)PSTD (Phase Sweeping TD)

STTD is the preferred diversity technique for CDMA2000The diversity gain of TDTD falls short of STTD by 1.2 to 2 dB

CDMA2000 STTD (Space-Time TD) or STSOTD (Orthogonal TD)

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Celletra TDAAdd-On Transmit Diversity

! Provides Transmit Diversity to Installed BTS – IS95 /CDMA2000

! Add-On, overnight installation and commissioning! Multicarrier! No change to the antennas

Live markets proven capacity increase of 15 to 50%(environment and traffic dependent)

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Network Optimization/Capacity Maximization Process

Improve the channel – reducerequired Eb/Io margin

– Receive diversities– Transmit diversities

Reduce SHO overhead

– beam shape and tilt– Back-off pilot

Balance the loads/ manage sectorresources

– Intersector balance– Intercell balance

Smart Antenna

– Optimize the channelper user

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CellShaperTMCell Resource Optimizer

TransmitDiversitycoveragebridge

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CellShaper add-on•Add-on to operating BTS

•Multicarrier

•A simple upgrade from TDA

•Antennas form-fit to legacyantennas

•Full remote control on-the-fly

Features•Sector width control

•Sector orientation control

•Beam tilt

•Transmit and receive spacediversity

•Capacity improvement 30%- 100% (environment andtraffic distribution dependent)

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CellShaper comparison withMultibeam Rosette Shaper

Advantage

NoneAdvantageTilt control

Performance comparisonDensity peak <400

Wider peakInter-cell balancing

No Tx diversityAngle Rx diversity

Space Tx diversitySpace Rx diversity

Diversities

ComplexOvernightInstallation

Large footprint in cabinetSplit BTS PA, or add ½PA. One-drawer interfaceand control.

Hardware

4 column multibeamForm-fit to legacyantennas

Antennas

MB ShaperCellShaperFeature

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Smart ClusterTM

IntegratedMeasurementand Control

System(IMC)

C-S

C-S

C-S

C-S

C-S - Cell-Shaper system

NMS / DBS

Dynamically Optimized Cluster ofCellShapers

Capacity increase 60% to 150%

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The Migration Path

IntegratedMeasurementand Control

System(IMC)

BTS

Existing cell site

Step 1Add-On Transmit Diversity

TD - Transmit Diversity

Step 2Add-On Cell-Shaper

Beam Width , BeamOrientation and Tilt Control

Step 3Smart Cluster

C-S

C-S

C-S

C-S

C-S - Cell-Shaper system

NMS / DBS

BTS

BTS

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Capacity Steps

Existing Cell Site

Transmit Diversity Add-On

Add-OnCell - Shaper

Smart Cluster

Step 1 >>> Step 2 >>> Step 3

Performance Improvement Capacity or Coverage

15% - 50%+ Capacity

30% - 100%+ Capacity

60% - 150%+ Capacity

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Thank You