doc.: IEEE /0152r0 Submission May 2008 Gerald Chouinard, CRCSlide 1 Incumbent database query 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 /0152r0 Submission May 2008 Gerald Chouinard, CRCSlide 2 Incumbent dabase query For each CPE location, the WRAN base station will need to query the incumbent database to identify the restrictions in the use of the TV channels by this CPE due to presence of local incumbent operation –the location coordinates of the CPE will be provided to the incumbent database server –the database server will calculate the restrictions for each possible TV channel that the CPE can be tuned to based on co-channel (N), adjacent channels (N  1), taboo channels and potential intermodulation products falling in the wanted DTV channels, as well as local wireless microphone operation and local cable TV operation

doc.: IEEE /0152r0 Submission May 2008 Gerald Chouinard, CRCSlide 3 Incumbent dabase query (cont’d) The results of the query from the incumbent database server could be in terms of available and non-available channels at the CPE but will be more useful to the WRAN base station if it is in terms of the maximum EIRP that can be transmitted by the CPE in each TV channel (EIRP cap) –If the CPE needs an EIRP lower than the specified EIRP cap to establish a link with the base station, the CPE operation should be allowed in the channel –The base station should have the flexibility of trading off the transmit capacity from a CPE with the possibility of using a TV channel by allowing the use of a more robust modulation level (e.g., QPSK rate: 1/2) resulting in a lower needed EIRP in order to meet the EIRP cap. Note that the incumbent database server could reside, as a proxy, at the base station to allow local calculations

doc.: IEEE /0152r0 Submission May 2008 Gerald Chouinard, CRCSlide 4 Incumbent dabase query (cont’d) The following slides present an example of an incumbent database query where all the considerations regarding the protection of local DTV broadcasting are taken into account. Note that the regulators in various administrations may decide that protecting the DTV broadcasting service may not need to include all the aspects considered here: –Co-channel interference (N) –Adjacent channel interference (N  1) –Taboo channels –Intermodulation products generated in the DTV receivers –Direct pick-up by local cable TV set-top boxes In such case, the calculation of the maximum allowed EIRP in each channel would be consequently simplified

doc.: IEEE /0152r0 Submission May 2008 Gerald Chouinard, CRCSlide 5 Noise limited contour 41 dB(uV/m) <= DTV <= WRAN Alternate channels interference case when CPE is inside the DTV contour

doc.: IEEE /0152r0 Submission May 2008 Gerald Chouinard, CRCSlide 6 Allowable WRAN transmit power in the UHF TV band WRAN EIRP restriction resulting from the limited performance of the DTV receiver RF front-end (assuming 14 dB CPE antenna discrimination). (Linear extrapolation of the ATSC A-74 D/U values for the -84 dBm level at the noise-limited contour) 1st adjacent channel inside contour 1st adjacent channel outside contour

doc.: IEEE /0152r0 Submission May 2008 Gerald Chouinard, CRCSlide 7 Example of a CPE surrounded by DTV stations Ch 26 Ch 44 Ch 34 Ch 16 CPE-1 BS Example of a query to a centralized incumbent database

doc.: IEEE /0152r0 Submission May 2008 Gerald Chouinard, CRCSlide 8 DTV incumbent environment at CPE-1 Channels on wich TV transmitters exist within interference distance … TX Latitude (deg.) TX Longitude (deg.) TX ERP (dBW) TX Antenna height (m) Distance to closest DTV TX 210 km140 km5 km132 km Field strength level produced at device 30 dBuV/m 40 dBuV/m 123 dBuV/m 45 dBuV/m Inside protected contour? No Yes Distance to contour if outside 15 km1 km---

doc.: IEEE /0152r0 Submission May 2008 Gerald Chouinard, CRCSlide 9 Maximum allowed EIRP at CPE-1 in various UHF channels (4 watt EIRP limit and co-channel consideration) Radioastronomy

doc.: IEEE /0152r0 Submission May 2008 Gerald Chouinard, CRCSlide 10 Maximum allowed EIRP at CPE-1 in various UHF channels Co-channel and taboo channels consideration DTV taboo channels for CPEs inside protected contour (ATSC A/74 )

doc.: IEEE /0152r0 Submission May 2008 Gerald Chouinard, CRCSlide 11 Maximum allowed EIRP at CPE-1 in various UHF channels Co-channel, taboo and 3rd intermod consideration 3rd order intermod from Ch 34 into Ch 44

doc.: IEEE /0152r0 Submission May 2008 Gerald Chouinard, CRCSlide 12 Maximum allowed EIRP at CPE-1 in various UHF channels Co-channel, taboo, 3rd intermod and direct pickup Protection of cable-ready consumer electronic equipment (Direct pickup interference) if present

doc.: IEEE /0152r0 Submission May 2008 Gerald Chouinard, CRCSlide 13 Quiery results per WRAN device location (at CPE-1) Channel # TX cap (dBm) Channel # TX cap (dBm) Channel # TX cap (dBm) This EIRP array will be used at the base station to determine which channels can be used for operation and to control the maximum EIRP of the CPE through the closed-loop TPC

doc.: IEEE /0152r0 Submission May 2008 Gerald Chouinard, CRCSlide 14 Aggregation of quiery results per WRAN cell at BS Channel … BS TX cap (dBm) … CPE 1 TX cap (dBm) … CPE 2 TX cap (dBm) CPE 3 TX cap (dBm) CPE 4 TX cap (dBm) CPE 5 TX cap (dBm) CPE 6 TX cap (dBm) CPE 7 TX cap (dBm) CPE 8 TX cap (dBm) … Result of data fusion: - prioritization of the TV channels to be used: - operating channel - backup channel list - candidate channel list

doc.: IEEE /0152r0 Submission May 2008 Gerald Chouinard, CRCSlide 15 WRAN CPE EIRP Profile to protect NTSC receivers Note that the taboo channel situation is more difficult with analog television such as NTSC 1st adjacent channel inside contour 1st adjacent channel outside contour