June 2008 By MWG/AWG

1. A Comparative Analysis of Spectrum Alternatives for WiMAX Networks with Deployment Scenarios Based on the U.S. 700 MHz Band June 2008 By MWG/AWG

2. Outline • Introduction • The “700 MHz Band” in the United States • Path Loss Comparison • High Mobility Support Based on Doppler Spread • Coverage and Capacity Simulations • Metropolitan Area Deployment Comparisons • Conclusion

3. Introduction • Mobile WiMAX Release 1.0 Profiles • 2300 MHz to 3800 MHz • 2500MHz and 3500MHz • Radio and TV broadcasting • 470 MHz to 862 MHz • Comparison of WiMAX Deployments at 700 MHz and 2500 MHz • Range, coverage, capacity , and performance

4. The “700 MHz Band” in the United States • “Lower” 700 MHz Band in the US

5. The “700 MHz Band” in the United States • “Upper” 700 MHz Band in the US

6. Possible BS Configurations for US 700 MHz Band Plan

7. Path Loss Comparison • Channel Models • Building and Vehicular Penetration Loss • Other Parameter Differences • System Path Loss Model

8. Parameters for Path Loss Comparison

9. Suburban Outdoor Path Loss Comparison

10. Building and Vehicular Penetration Loss • Outdoor measurements were taken on both sides of the street and averaged • Indoor measurements were acquired in the rooms in an ‘X’ manner. • Attenuation for types of buildings, rooms and floors were measured and correlated

11. Building Penetration Loss in the 900 MHz Band • Buildings were grouped as follows: • High Integrated (HIn) : > 6 floors, sharing walls • High Isolated (HIs) : > 6 floors, non-sharing walls • Low Integrated (LIn) :< 6 floors, sharing walls • Low Isolated (LIs) :< 6 floors, non-sharing walls • Rooms were classified as follows: • Indoor Light (IL) : room with windows to outdoors • Indoor (I) : room without windows, one wall separation • Deep Indoor (DI): Multiple walls • Attenuation increased as you go deeper into the building (IL ~5dB, I~6dB, DI~9dB) • Attenuation penetration decrease for higher floors(~0.8 dB/floor)

12. Other Parameter Differences • Cable Losses • In 2500MHz band: cable losses from 2dB to 6dB • In 700MHz band: cable losses from 1dB to 3dB

13. System Path Loss Model

14. High Mobility Support Based on Doppler Spread • PICI: inter-carrier interference power relative to received signal power • fd: Doppler frequency • Ts: symbol period

15. : depend on the particular Doppler spectrum value

16. Doppler Spreading Impact on SINR

17. Coverage and Capacity Simulations • Compare coverage, interference, and channel capacity performance between 700 MHz and 2500 MHz WiMAX Systems • Simulation time is about 100 seconds, which contain 20,000 5 ms frames

20. Average Interference Margin

21. 90% of MSs have a DL data subcarrier CINR greater than -4dB in a 2500 MHz system 90%of MSs have a DL data subcarrier CINR greater than 0 dB in the 700 MHz system 700 MHz system achieve greater coverage Coverage Comparison Based on Data CDF Curves

22. DL MCS (Modulation and coding scheme) usage from QPSK ½ to 64QAM 3/4 Modulation & Coding Scheme Utilization Comparison

23. User Throughput Distribution 700 MHz system has both higher user throughput and better area coverage

24. Metropolitan Area Deployment Comparisons

25. Metropolitan Area Deployment Comparisons

29. Other Mobile WiMAX™ Usage Models

30. Conclusion • Compared to WiMAX solution in the 2500 MHz frequency band, 700 MHz deployment provide a considerable rage benefit

31. Comment • Spectrum is limited, and low frequency spectrum is valuable • How to reuse the spectrum is an important issues