1. doc.: IEEE 802.22-07/0529r0 Submission November 2007 Gerald Chouinard, CRCSlide 1 TV Incumbent Database Access IEEE P802.22 Wireless RANs Date: 2007-11-10 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 802.22-07/0529r0 Submission November 2007 Gerald Chouinard, CRCSlide 2 TV Incumbent Database Access Base stations will access an Incumbent Database to verify the potential interference situation The Incumbent database will need to be established and agreed upon among broadcasters, potential WRAN operators and regulators Access will be on a location basis (Lat, Long) The Incumbent Database will really be a data service similar to various “Web-2” services where calculations specific to the query will be done based on the query input Various levels of pre-calculated data can be considered based on a trade-off between calculation time and size of the data base

3. doc.: IEEE 802.22-07/0529r0 Submission November 2007 Gerald Chouinard, CRCSlide 3 Quiery input per WRAN device location Base station or CPE parameters to be provided –Location of the transmitting device: (Lat, Long) –Antenna height: (x meters above local ground level) –On-axis maximum EIRP –Azimuth of maximum antenna gain –Type of antenna gain pattern (azimuthal)

4. doc.: IEEE 802.22-07/0529r0 Submission November 2007 Gerald Chouinard, CRCSlide 4 Incumbent Database functionality Database will contain list of TV broadcast stations in region –Transmitter location (Lat, Long) –Station ERP, antenna height (HAAT) –Transmit antenna gain pattern Database will include verified topographic data and land cover data for the region Database will include agreed propagation model Location of a WRAN device inside or outside TV interference contour will be based on 1 dB TV receiver desensitization on protected contour (41 dBuV/m) for F(50,10) Location of a WRAN device inside or outside a protected contour will be based on: –Available field strength at the device location (> 41 dBuV/m) –Absence of TV interference (D/U > 15 dB) –Confirmation of a non-excessive distance from a TV station (extra considerations such as DMA, etc.)

5. doc.: IEEE 802.22-07/0529r0 Submission November 2007 Gerald Chouinard, CRCSlide 5 Example of a query Ch 26 Ch 44 Ch 34 Ch 16 CPE BS

6. doc.: IEEE 802.22-07/0529r0 Submission November 2007 Gerald Chouinard, CRCSlide 6 Database calculations Channels on wich TV transmitters exist within interference distance 16263445 … TX Latitude (deg.) 44.2 45.747.1 TX Longitude (deg.) -78.1-82.2-80.4-82.1 TX ERP (dBW) 60505560 TX Antenna height (m) 300275250280 Field strength level produced at device 43 dBuV/m 50 dBuV/m 137 dBuV/m 70 dBuV/m Inside protected contour? No Yes Distance to contour if outside 15 km2 km___

7. doc.: IEEE 802.22-07/0529r0 Submission November 2007 Gerald Chouinard, CRCSlide 7 Channel availability: Co-channel protection Radioastronomy

8. doc.: IEEE 802.22-07/0529r0 Submission November 2007 Gerald Chouinard, CRCSlide 8 Channel availability: Adjacent channel CPE outside but close to protected contour

9. doc.: IEEE 802.22-07/0529r0 Submission November 2007 Gerald Chouinard, CRCSlide 9 Channel availability: Taboo channel DTV taboo channels for CPEs inside protected contour (ATSC A/74 )

10. doc.: IEEE 802.22-07/0529r0 Submission November 2007 Gerald Chouinard, CRCSlide 10 Channel availability: 3rd intermod Power limit to control 3rd order intermod from channel 34 into 44

11. doc.: IEEE 802.22-07/0529r0 Submission November 2007 Gerald Chouinard, CRCSlide 11 Quiery results per WRAN device location Channel #14151617181920212223242526 TX cap (dBW)66-9966-4 6666-9-99 Channel #27282930313233343536373839 TX cap (dBW)-96-4 -3-12-11-99-11-12-994-23 Channel #404142434445464748495051 TX cap (dBW)4-3-12-11-99-11-12-3-4 66

12. doc.: IEEE 802.22-07/0529r0 Submission November 2007 Gerald Chouinard, CRCSlide 12 Aggregation of quiery results per WRAN cell Channel14151617181920212223242526… BS TX cap20 -9920 10… CPE 1 TX cap66-9966-4 6666-9-99… CPE 2 TX cap66-9966-4666-116-9-99 CPE 3 TX cap66-996666-36-116-4-99 CPE 4 TX cap-46-9966666 CPE 5 TX cap-46-99666 CPE 5 TX cap-46-9966 CPE 5 TX cap66-996 CPE 5 TX cap66-996 …

13. doc.: IEEE 802.22-07/0529r0 Submission November 2007 Gerald Chouinard, CRCSlide 13 Channel classification Spectrum manager will use the compiled table of allowed EIRP levels at the base station and at all CPEs in each TV channel to establish and maintain its prioritized list of channels (i.e., operating, backup and candidate channels) –The scheme used to establish and maintain this list in the base station does not need to be standardized (prioritization would be based on channels that allow the highest TX cap for all or the largest number of CPEs to allow proper service, i.e., smallest number of CPEs needing to be disallowed if number of free channels gets limited) –The mechanism to implement the signalling of the operating and backup channels from the BS to the CPEs needs to be standardized –The mechanism to execute the channel change at the BS and at the CPEs needs to be standardized

14. doc.: IEEE 802.22-07/0529r0 Submission November 2007 Gerald Chouinard, CRCSlide 14 Securing non-interference to TV broadcast Whatever the resulting choice of channels to be used by the WRAN cell, the TX cap assigned to the BS and each CPE should be in accord with the values provided by the incumbent database service for the selected channel. Access to the value of the TX cap for the BS and CPEs will be provided through standardized interfaces to allow compliance testing and also verification during operation

15. doc.: IEEE 802.22-07/0529r0 Submission November 2007 Gerald Chouinard, CRCSlide 15 Added value from RF sensing If the incumbent database can be quieried as explained, there is little added value to be gained by RF sensing of TV incumbents at the BS and CPEs. If TV sensing is needed, more intelligence will be needed at the base station to confirm the RF sensing measurements (identify false alarms) and prioritize the channels to be used (operating, backup and candidate) More information from the incumbent database will be needed at the BS to allow local calculations to confirm sensing results: –Location of the TV broadcast stations, ERP, antenna height, antenna pattern –Propagation models –Means to locate contours within which TV reception needs protection

16. doc.: IEEE 802.22-07/0529r0 Submission November 2007 Gerald Chouinard, CRCSlide 16 Conclusions Access to TV Incumbent Database should be the prime method to select the operating channel of WRAN systems and limit the transmit power of WRAN devices according to their potential local interference situation Once the maximum power limit for WRAN devices are know from the Incumbent database, the selection of the operating and backup channels for WRAN operation can be made by various schemes that don’t need to be standardized (fits under the SME) The process to operate on the designated channel and switch to the proper backup channels along with the required signalling between the BS and CPEs needs to be standardized (fits under the BS MAC) TV RF sensing would be needed where a reliable TV incumbent database is not available