Interference Cancellation as a Mobile Enhancement to Improve Spectral Efficiency

IEEE ComSoc Denver ChapterJanuary 16, 2007

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Introduction

Privately held, wireless technology company focused solely on spectral efficiency

Core competency in interference cancellation for wireless systems

• CDMA, WCDMA (Release 99), HSDPA, GPS, S-DMB, T-DMB

Products• ICAT – Interference Cancellation Analysis Tool• ICT440 – HSDPA Interference Cancellation Technology• ICT220 – Voice systems – CDMA1x, WCDMA (Rel99)

Industry leader in interference cancellation • Over 85 patents issued/filed

Located in Denver, Colorado

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Discussion Points

How is Interference a Limitation of Network Performance• Explanation of the impact interference has on a network• How interference cancellation improves network efficiency • Tools to analyze interference on a commercial network• How much interference exists on 2G and 3G networks

What can be done to Eliminate Interference• Overview of TensorComm’s Interference Cancellation Technology (ICT™)

What is the Impact of Interference Cancellation on Network Performance and Economics

• Capacity improvement results as measured on a CDMA commercial network

• Throughput gains derived from WCDMA/HSDPA commercial networks• Economic benefits to the Operator as calculated from validated models

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Interference is the Key Limiter ofCode-Based Network Performance

•As reported by Morgan Stanley 3G Test conducted in London.

Data rate increase

Capacity Impact• Interference causes base stations to broadcast more power to each terminal• The number of terminals that can be supported simultaneously is reduced

Quality of Service degradation• Increase in coverage holes leads to more frequent dropped calls

Data Rate reduction• Degraded reception leads to lower data transfer rates• For increased data rates, only users near cell center have sufficient power, thus

majority of users effectively at edge of cell

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Interference Cancellation Delivers Performance Improvements

Interference is prevalent on all coded networks; which limits capacity and performance

• Traditional option is to add base stations or acquire more spectrum to overcome interference

Historically, interference cancellation was considered too complex to implement in a mobile device

• Technology advancements now make it practical

Operators looking for solutions to maximize spectrum efficiency

TensorComm’s technology is a breakthrough innovation to address the industry’s interference problem

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Network Analyses Conducted with WCDMA Operators

TensorComm collected data from multiple commercial networks which identified a high level of interference on CDMA and WCDMA networks.

More than 50% of the time a mobile device is in a condition nearing the edge of cell where performance and data rates significantly degrade.

10 20 30 40 50 60 70 80 90 100 -3 dB

0 dB

3 dB

5 dB

10 dB

0

2

4

6

8

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Probability of Occurrence (%)

% Interference Identified

Geometry (dB)

Probability of Occurrence for Geometry and % Interference Identified(as measured on a commercial network)

-3 dB

0 dB

3 dB

5 dB

10 dB

Network collects indicate that the most probable condition is at the edge of cell (0 dB geometry) with more than 90% of the interference identifiable and cancelable by ICT.

Percentage of Identified Interference is:

This percent of the time:

0 - 10 0.00%

11 - 20 0.00%

21 - 30 0.04%

31 - 40 0.55%

41 - 50 1.65%

51 - 60 4.78%

61- 70 8.98%

71 - 80 13.47%

81 - 90 16.46%

91 - 100 54.07%

Across all geometries

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ICT: Low Cost, High Performance Solution for Canceling Interference

Typical Handset Architecture

ICT delivers a seamless integration with existing mobile device and baseband designs, without requiring form factor changes

or radio frequency (RF) redesign

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Extensive Testing Validates ICT Gains

Completed extensive simulation, lab, field & commercial testing

Core technology validated on CDMA commercial networks using an integrated FPGA platform

ICT provides gains of up to 6dB as observed on base station logs

Provides greatest gains when and where the network needs it most

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Forward Traffic Channel Power vs. Time75% OCNS

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Canceller Off Canceller On Canceller Off Canceller On

Fw

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er (

dbm

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Interference Cancellation will allow Devices to Draw Less Power from the Base Station.

*Measured from base station logs

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ICT Delivers a Superior Data Experience

In lab demonstrations, recorded significant decrease in the time required to transfer a data file when ICT is enabled.

ICT on ICT off

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Leaving Performance on the Table

Throughput increase of over 60% readily available.

bps/

Her

tz

bps/Hertz

Increase in throughput with ICT on an HSDPA network SINR gain with ICT on an HSDPA network

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ICT Provides Dramatic Financial Benefits to Operators

With the deployment of ICT, each cell site can handle higher volumes of voice and data traffic.

ICT gain translates into a delay of infrastructure deployment, reducing CAPEX and OPEX.

Makes all network capacity expenditures 60% more efficient.

Example of Economic Model Output for one Mid Size CDMA Market

• Model developed and validated with multiple Operators

• Results from field test input to calculate increase in users/sector

• Model loaded with network stats to represent mid size market (200K users)

• Each sector loaded with unique traffic distribution to simulate operational network

CAPEX ($)

Savings with ICT within 5 year periodC

APEX ($)

Savings with ICT within 5 year period

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The Benefits of Interference Cancellation to Wireless Operators

Improves network voice capacity and data throughput

Extends the life of existing deployed infrastructure

Can increase Operator cash flows by significant levels:• Additional spectrum expansion delayed or eliminated

• Each incremental ICT-enabled terminal provides a benefit to the consumer and operator.

Improves network performance significantly, leading to higher satisfaction:• Improves call quality and reduces dropped calls

• Provides superior data streaming experience

• Extends coverage at network edge

Operators deploying Interference Cancellation will derive operational and economic benefits