doc.: IEEE /00529r1 Submission November 2007 Gerald Chouinard, CRCSlide 1 TV Incumbent Database Access IEEE P Wireless RANs Date: Authors: Notice: This document has been prepared to assist IEEE 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 Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures 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 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at >

doc.: IEEE /00529r1 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

doc.: IEEE /00529r1 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) } Higher layer application MAC & PHY

doc.: IEEE /00529r1 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.)

doc.: IEEE /00529r1 Submission November 2007 Gerald Chouinard, CRCSlide 5 Example of a query Ch 26 Ch 44 Ch 34 Ch 16 CPE BS

doc.: IEEE /00529r1 Submission November 2007 Gerald Chouinard, CRCSlide 6 Database calculations Channels on wich TV transmitters exist within interference distance … TX Latitude (deg.) TX Longitude (deg.) TX ERP (dBW) TX Antenna height (m) 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___

doc.: IEEE /00529r1 Submission November 2007 Gerald Chouinard, CRCSlide 7 Channel availability: Co-channel protection Radioastronomy

doc.: IEEE /00529r1 Submission November 2007 Gerald Chouinard, CRCSlide 8 Channel availability: Adjacent channel CPE outside but close to protected contour

doc.: IEEE /00529r1 Submission November 2007 Gerald Chouinard, CRCSlide 9 Channel availability: Taboo channel DTV taboo channels for CPEs inside protected contour (ATSC A/74 )

doc.: IEEE /00529r1 Submission November 2007 Gerald Chouinard, CRCSlide 10 Channel availability: 3rd intermod Power limit to control 3rd order intermod from channel 34 into 44

doc.: IEEE /00529r1 Submission November 2007 Gerald Chouinard, CRCSlide 11 Quiery results per WRAN device location Channel # TX cap (dBW) Channel # TX cap (dBW) Channel # TX cap (dBW)

doc.: IEEE /00529r1 Submission November 2007 Gerald Chouinard, CRCSlide 12 Aggregation of quiery results per WRAN cell Channel … BS TX cap (dBW) … CPE 1 TX cap (dBW) … CPE 2 TX cap (dBW) CPE 3 TX cap (dBW) CPE 4 TX cap (dBW) CPE 5 TX cap (dBW) CPE 6 TX cap (dBW) CPE 7 TX cap (dBW) CPE 8 TX cap (dBW) …

doc.: IEEE /00529r1 Submission November 2007 Gerald Chouinard, CRCSlide 13 Channel classification Spectrum manager shall 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 channel sets (i.e., operating, backup and candidate channels) –The scheme used to establish priorities within the individual channel sets is beyond the scope of the standard.* –The conditions to transition between channel sets needs to be standardized (states diagram) –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 –Access to the value of the TX cap for the BS and CPEs should be provided through a standardized SNMP MIB * Note [GC] It is expected that the compiled table will first be used to prioritize the channels according to their availability. Then, other considerations, local to the base station, will be included to refine this priority list and then the first channels in the list will be classified according to the operating, backup and candidate sets.

doc.: IEEE /00529r1 Submission November 2007 Gerald Chouinard, CRCSlide 14 Information sent from the BS to the CPEs Suggested method 1 Channel number TX cap (dBW) Operating176 Backup #1156 Backup #2186 Backup #3226 Candidate #1246 Candidate #3146 CPE 1 Channel number TX cap (dBW) Operating176 Backup #1156 Backup #2186 Backup #3226 Candidate #1246 Candidate #3146 Channel number TX cap (dBW) Operating176 Backup #1156 Backup #2186 Backup #3226 Candidate #1246 Candidate #3146 CPE 2 CPE 3 Occupied channels will have to be signalled to the CPEs by a different means if it is needed to facilitate the sensing process.

doc.: IEEE /00529r1 Submission November 2007 Gerald Chouinard, CRCSlide 15 Information sent from the BS to the CPEs Suggested method 2 CPE 1 Channel number Priority TX cap (dBW) ……… CPE 2 CPE 3 Channel number Priority TX cap (dBW) ……… Channel number Priority TX cap (dBW) ……… 51126

doc.: IEEE /00529r1 Submission November 2007 Gerald Chouinard, CRCSlide 16 Information sent from the BS to the CPEs Suggested method 2 Besides the TX cap values for each channel trasmitted to the CPE, a subset of these values will be used to signal the use of the channels that are unavailable/dissallowed/occupied: –Special codes to help CPE sensing: -99: Unavailable channel (from the TV Incumbent Database) -98: Dissallowed channel at the base station -97: Channel occupied by WRAN -96: Channel occupied by Wireless Microphones -95: Channel occupied by public safety devices -94: … The number of backup channels and candidate channels that need to be kept clear, as set by the base station, needs to be signalled to the CPE by another means –Note that the number of backup and candidate channels set by the BS will depend on the variability of the potential interference situation in the area

doc.: IEEE /00529r1 Submission November 2007 Gerald Chouinard, CRCSlide 17 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 during operation. 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, backups and candidates) More information from the incumbent database would 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

doc.: IEEE /00529r1 Submission November 2007 Gerald Chouinard, CRCSlide 18 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 known from the Incumbent database, the selection of the operating and backup channels for WRAN operation can be made by various schemes that do not need to be standardized (will be part of 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 (will be part of the BS MAC) Beyond normal RF sensing, TV incumbent sensing will be needed where a reliable TV incumbent database is not available