1. doc.: IEEE 802.22-07-0103-00-0000 Submission March 2007 Cheng Shan, Samsung ElectronicsSlide 1 Joint Transmitted EIRP Control for the Protection of TV Incumbents in co-channel and first adjacent channels operation outside the TV noise-protected contour IEEE P802.22 Wireless RANs Date: 2007-03-11 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 802.22-07-0103-00-0000 Submission March 2007 Cheng Shan, Samsung ElectronicsSlide 2 Abstract This presentation reviews the scenarios when jointly controlling the transmit EIRP cap of multiple WRAN devices; a method is proposed so that the aggregated interference would not exceeding the D/U ratios at the noise protected contour of TV stations. This presentation is intented as an overview of the proposed normative text submitted in contribution 22- 07-0016-00-0000_Proposed_text_changes_to_22-06- 0259-00-0000_v0.1_AnnexB2 associated with comment #138. This item was identified as “green, urgent”.

3. doc.: IEEE 802.22-07-0103-00-0000 Submission March 2007 Cheng Shan, Samsung ElectronicsSlide 3 Operational Scenario When multiple WRAN devices (CPEs/BSs) transmit simultaneously, the interferences thus induced at the TV protected contour aggregate The transmit power of WRAN devices must be jointly controlled to protect the incumbent users

4. doc.: IEEE 802.22-07-0103-00-0000 Submission March 2007 Cheng Shan, Samsung ElectronicsSlide 4 Joint TPC for CPE: Scenario Simultaneous CPE transmissions could occur in the following scenarios, where JTPC shall be applied: –Uplink sharing of the same TV channel but not the same subchannel –Uplink sharing of the same subchannel within the same TV channel –WRAN cells sharing the same TV channel but not the same subchannel (same WRAN or coexistence with another WRAN) –WRAN cells sharing the same subchannel within the same TV channel (same WRAN or coexistence with another WRAN) –Contention-based access to a WRAN base station. –Coexistence with other license-exempt users whose transmissions can be modelled as another CPE transmitting simultaneously with one or more CPEs of the WRAN.

5. doc.: IEEE 802.22-07-0103-00-0000 Submission March 2007 Cheng Shan, Samsung ElectronicsSlide 5 Joint TPC for CPE: Requirement There is no unique solution to define a CPE power control algorithm, which is a implementation issue A good power control algorithm shall satisfy both individual and joint transmit EIRP Cap A test module should be present after any resource allocation and power control algorithms and before actual transmission, to ensure there is no excessive interference induced at the protected contour of the incumbent TV system The maximum transmit EIRP of CPE shall be explicitly notified to each CPE by BS

6. doc.: IEEE 802.22-07-0103-00-0000 Submission March 2007 Cheng Shan, Samsung ElectronicsSlide 6 Joint TPC for CPE: Procedure BS decides if joint TPC test module shall be activated –multiple CPEs are scheduled to transmit simultaneously within channel N, –and these CPEs are within a certain constrained area BS calculates the induced joint interference at TV channel N as well as its adjacent ones N±1, by summing up the interferences from each individual CPE in concern, which is based on –Transmitting power of the CPE –Geolocation information of the CPE and the incumbent protected contour –Propagation channel model from CPE to the protected contour If the joint interference violates the D/U ratio requirement at the protected contour, all the transmit powers of those CPEs in concern shall be reduced by a predefined amount until the D/U ratio is satisfied

7. doc.: IEEE 802.22-07-0103-00-0000 Submission March 2007 Cheng Shan, Samsung ElectronicsSlide 7 Joint TPC for BS Similar to the joint TPC of CPE, when multiple BSs are operating in a same channel N, the WRAN system shall guarantee the joint interference induced at the incumbent protected contour meet the D/U ratio requirement at channel N as well as its adjacent channels