Geral d Cho uinar Slide 1 doc.: IEEE 802.22-08/0152r0 Submission May 2008 Incumbent database query IEEE P802.22 Wireless RANs Date: 2008-05-20 N am e C om pany A ddress Phone em ail G erald Chouinard CRC 3701 Carling A venue, O ttaw a, O ntario, Canada K 2H 8S2 (613)998-2500 gerald.chouinard@ crc.ca 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 Chair Carl 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 [email protected].
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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 Chair Carl 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 [email protected].>
Gerald Chouinard, CRC
Slide 2
doc.: IEEE 802.22-08/0152r0
Submission
May 2008
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 (N1), taboo channels and potential intermodulation products falling in the wanted DTV channels, as well as local wireless microphone operation and local cable TV operation
Gerald Chouinard, CRC
Slide 3
doc.: IEEE 802.22-08/0152r0
Submission
May 2008
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
Gerald Chouinard, CRC
Slide 4
doc.: IEEE 802.22-08/0152r0
Submission
May 2008
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
Gerald Chouinard, CRC
Slide 5
doc.: IEEE 802.22-08/0152r0
Submission
May 2008
Noise limited contour
41 dB(uV/m)
<= DTV <= WRAN
Alternate channels interference case when CPE is inside the DTV contour
Gerald Chouinard, CRC
Slide 6
doc.: IEEE 802.22-08/0152r0
Submission
May 2008
Allowable WRAN transmit power in the UHF TV band
WRAN EIRP restriction resulting from the limited performanceof 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)