Interference Cancellation for Spectral Efficiency Enhancement in Mobile Networks

1. Interference Cancellation as a Mobile Enhancement to Improve Spectral EfficiencyIEEE ComSoc Denver ChapterJanuary 16, 2007

2. 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

3. 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

4. Interference is the Key Limiter ofCode-Based Network Performance 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 • As reported by Morgan Stanley • 3G Test conducted in London.

5. 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

6. 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.

7. 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

8. 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

9. Interference Cancellation will allow Devices to Draw Less Power from the Base Station. Fwd TCH Power (dbm) *Measured from base station logs

10. ICT Delivers a Superior Data Experience ICT off ICT on In lab demonstrations, recorded significant decrease in the time required to transfer a data file when ICT is enabled.

11. Leaving Performance on the Table SINR gain with ICT on an HSDPA network Increase in throughput with ICT on an HSDPA network bps/Hertz bps/Hertz Throughput increase of over 60% readily available.

12. ICT Provides Dramatic Financial Benefits to Operators • 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 • 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

13. 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