1. doc.: IEEE 802.22-07/0462r1 Submission Nov. 2007 Cheng Shan, Samsung Electronics Slide 1 Aggregated Interference from CPEs IEEE P802.22 Wireless RANs Date: 2007-08-23 Authors: Notice: This document has been prepared to assist IEEE 802.22. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.22. Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures http://standards.ieee.org/guides/bylaws/sb-bylaws.pdf including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chairhttp://standards.ieee.org/guides/bylaws/sb-bylaws.pdf Carl R. StevensonCarl R. Stevenson as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE 802.22 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at patcom@iee.org.patcom@iee.org >

2. doc.: IEEE 802.22-07/0462r1 Submission Nov. 2007 Cheng Shan, Samsung Electronics Slide 2 Abstract In this document, we illustrate the aggregated interference from CPEs through simulations

3. doc.: IEEE 802.22-07/0462r1 Submission Nov. 2007 Cheng Shan, Samsung Electronics Slide 3 Simulation Parameters (1) DTV –1MW TV station with protect contour radius 134.2km –TV receivers are equipped with directional antennas with front-to-back ratio 14dB –The DTV antennas are pointing toward TV station with misalignment WRAN BS –Two kinds of BSs are investigated 4Watt BS with cell radius 16km 100Watt BS with cell radius 30km –CPEs from ONE WRAN cell are investigated; the WRAN cell is tangent to the TV protect contour

4. doc.: IEEE 802.22-07/0462r1 Submission Nov. 2007 Cheng Shan, Samsung Electronics Slide 4 Simulation Parameters (2) CPE –Uniformly distributed within the WRAN cell –TV receivers are equipped with directional antennas with front-to-back ratio 16dB –The CPE antennas (10m in height) are pointing toward WRAN BS with misalignment degrees, whose standard deviation is degrees (Gaussian distribution assumed) –EIRP keep-out distance: 3.1km 4W EIRP outside the keep-out distance Individual EIRP control for each CPE is applied for those CPEs dropped inside the keep-out distance Propagations –TV Station -> TV receiver: F(50,90) –CPE -> TV receiver: F(50,10)

5. doc.: IEEE 802.22-07/0462r1 Submission Nov. 2007 Cheng Shan, Samsung Electronics Slide 5 Simulation Methodology For each trial – N CPEs are randomly dropped in the cell, each with –Minimum D/U ratio along the TV protected contour is recorded If this minimum D/U ratio is less than 23 dB, aggregated interference occurs to the incumbent TV system Multiple trials are repeated to find the probability of excessive aggregated interference from CPEs to incumbent TV system Assumption: –The path-loss attenuation is assumed to be deterministic, while it is statistical in practice (referring the definition of F(50, 90) and F(50,10) models);

6. doc.: IEEE 802.22-07/0462r1 Submission Nov. 2007 Cheng Shan, Samsung Electronics Slide 6 Simulation Scenario

7. doc.: IEEE 802.22-07/0462r1 Submission Nov. 2007 Cheng Shan, Samsung Electronics Slide 7 Antenna Pattern

8. doc.: IEEE 802.22-07/0462r1 Submission Nov. 2007 Cheng Shan, Samsung Electronics Slide 8 Probability of causing AI vs. number of CPEs in a cell 100W BS 4W BS

9. doc.: IEEE 802.22-07/0462r1 Submission Nov. 2007 Cheng Shan, Samsung Electronics Slide 9 100W BS, d = 0km.

10. doc.: IEEE 802.22-07/0462r1 Submission Nov. 2007 Cheng Shan, Samsung Electronics Slide 10 100W BS, d = 1km.

11. doc.: IEEE 802.22-07/0462r1 Submission Nov. 2007 Cheng Shan, Samsung Electronics Slide 11 100W BS, d = 2km.

12. doc.: IEEE 802.22-07/0462r1 Submission Nov. 2007 Cheng Shan, Samsung Electronics Slide 12 100W BS, d = 3.1km.

13. doc.: IEEE 802.22-07/0462r1 Submission Nov. 2007 Cheng Shan, Samsung Electronics Slide 13 4W BS, d = 0km.

14. doc.: IEEE 802.22-07/0462r1 Submission Nov. 2007 Cheng Shan, Samsung Electronics Slide 14 4W BS, d = 1km.

15. doc.: IEEE 802.22-07/0462r1 Submission Nov. 2007 Cheng Shan, Samsung Electronics Slide 15 4W BS, d = 2km.

16. doc.: IEEE 802.22-07/0462r1 Submission Nov. 2007 Cheng Shan, Samsung Electronics Slide 16 4W BS, d = 3.1km.

17. doc.: IEEE 802.22-07/0462r1 Submission Nov. 2007 Cheng Shan, Samsung Electronics Slide 17 probability of causing AI vs. distance btw WRAN cell edge and TV protect contour 100W BS 4W BS

18. doc.: IEEE 802.22-07/0462r1 Submission Nov. 2007 Cheng Shan, Samsung Electronics Slide 18 100W BS,.

19. doc.: IEEE 802.22-07/0462r1 Submission Nov. 2007 Cheng Shan, Samsung Electronics Slide 19 100W BS,.

20. doc.: IEEE 802.22-07/0462r1 Submission Nov. 2007 Cheng Shan, Samsung Electronics Slide 20 100W BS,.

21. doc.: IEEE 802.22-07/0462r1 Submission Nov. 2007 Cheng Shan, Samsung Electronics Slide 21 4W BS,.

22. doc.: IEEE 802.22-07/0462r1 Submission Nov. 2007 Cheng Shan, Samsung Electronics Slide 22 4W BS,.

23. doc.: IEEE 802.22-07/0462r1 Submission Nov. 2007 Cheng Shan, Samsung Electronics Slide 23 4W BS,.

24. doc.: IEEE 802.22-07/0462r1 Submission Nov. 2007 Cheng Shan, Samsung Electronics Slide 24 How much to expand for the TV contour? The probability of causing aggregated interference decreases significantly as the WRAN cell goes further away from the TV protect contour; Set a threshold as 2% probability of causing AI –100W BS, expand 0.8 km from the original; –4W BS, expand 2.5 km from the original

25. doc.: IEEE 802.22-07/0462r1 Submission Nov. 2007 Cheng Shan, Samsung Electronics Slide 25 Further Discussion The above conclusion is drawn by assuming a deterministic propagation model rather than a statistics one, i.e., assuming the pathloss is exactly the value in F(x,y) table; however, –by assuming TV Station -> TV receiver: F(50,90); CPE -> TV receiver: F(50,10), each individual CPE has an outage probability causing excessive interference; –aggregated interference from multiple CPEs is for sure more severe from an outage perspective; A statistical outage probability shall be defined together with the D/U ratio requirement; Further study on effect from statistical channel model is necessary.