Wireless Microphone Sensing March 2007 doc.: IEEE 802.22-07/0zzzr0 November 2007 IEEE P802.22 Wireless RANs Date: 2007-11-11 Wireless Microphone Sensing 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 patcom@iee.org. > Gerald Chouinard, CRC Gerald Chouinard

Time to validate Operational channel: 2 s Backup channels: 6 s March 2007 doc.: IEEE 802.22-07/0zzzr0 November 2007 Time to validate Operational channel: 2 s Backup channels: 6 s Channel availability Check Time: A candidate channel needs to have been available for 30 seconds before becoming a backup channel Detection and confirmation of incumbent If presence of incumbent is detected by BS or CPEs and confirmed by the BS, the entire cell moves to the first backup channel or the CPEs where it was detected are dissallowed from the network In the case of a backup channel, this channel is returned to the “null” set unless the CPEs where incumbents were detected are to be dissallowed from the use of this channel when it becomes the operating channel. Gerald Chouinard, CRC Gerald Chouinard

Operational channel availability check March 2007 doc.: IEEE 802.22-07/0zzzr0 November 2007 Operational channel availability check Co-channel validation (N) Wireless microphone protection level: Functional Requirement Document: 20 dB(uV/m) (equivalent to the field strength produced by a CPE at 10 m with an emission level of 4.8 uV/m at 3 m in 120 kHz) Calculations: 32.7 dB(uV/m) (see next slide) Functional Requirement Document is too restrictive by 12.7 dB Gerald Chouinard, CRC Gerald Chouinard

November 2007 Maximum field strength allowed before interference to wireless microphones Gerald Chouinard, CRC

WRAN coverage and co-channel operation with wireless microphones November 2007 WRAN coverage and co-channel operation with wireless microphones Edge of coverage of the WRAN BS (e.g., 17 km for 4 W EIRP, 31 km for 100 W EIRP) 28.8 dB(uV/m) 32.7 + Δ att_1.5m/10m dB(uV/m) Wireless microphone operation Area where, if wireless microphones are detected, the BS cannot operate on the same TV channel Area where CPEs need to change frequency R2 Area where CPEs need to reduce their transmit power as a function of their distance to the wireless microphone operation R1 Area where, if wireless microphones are detected, the nearby CPEs need to either change frequency or reduce their transmit power Gerald Chouinard, CRC

Operational channel availability check March 2007 doc.: IEEE 802.22-07/0zzzr0 November 2007 Operational channel availability check Co-channel validation (N) Co-channel sensing needs to be done during quiet periods on channel N, and possibly on channels N+/-1 if WRAN operation exists (see leakage from WRAN out-of-band emission on adjacent channels in next slides) Where do we consider the effect of poor channel selectivity on the RF sensing path that would mask incumbent on channel N because of IF filter leakage from N+\-1? Base station cannot operate co-channel if there is a wireless microphone operation within R1 from the BS For distance larger than R1 from the base station, CPEs need to reduce power or change frequency if they are within R2 from a wireless microphone operation to protect it For smaller distances from a wireless microphone operation, CPEs cannot reduce power sufficiently to keep contact with the base station and need to change frequency Gerald Chouinard, CRC Gerald Chouinard

Operational channel availability check March 2007 doc.: IEEE 802.22-07/0zzzr0 November 2007 Operational channel availability check Adjacent channel validation (N+\-1) Interference can be generated from WRAN signal emission in the adjacent channels Extent of interference will depend on the allowed WRAN out-of-band emission in the adjacent channels WRAN RF Mask considerations => Gerald Chouinard, CRC Gerald Chouinard

November 2007 WRAN RF Mask Gerald Chouinard, CRC

November 2007 WRAN RF Mask Gerald Chouinard, CRC

November 2007 WRAN RF Mask Gerald Chouinard, CRC

November 2007 WRAN RF Mask Gerald Chouinard, CRC

November 2007 WRAN RF Mask Gerald Chouinard, CRC

WRAN coverage and adjacent-channel operation with wireless microphones November 2007 WRAN coverage and adjacent-channel operation with wireless microphones Assuming 33 dB as for the FCC Mask Edge of coverage edge of the WRAN BS (e.g., 17 km for 4 W EIRP, 31 km for 100 W EIRP) 28.8 dB(uV/m) 32.7 + 33 + Δ att _1.5m/10m dB(uV/m) Wireless microphone operation Area where, if wireless microphones are detected, the BS cannot operate on the same TV channel R4 Area where CPEs need to change frequency R3 Area where CPEs need to reduce their transmit power as a function of their distance to the wireless microphone operation Area where, if wireless microphones are detected, the nearby CPEs need to either change frequency or reduce their transmit power Gerald Chouinard, CRC

Operational channel availability check March 2007 doc.: IEEE 802.22-07/0zzzr0 November 2007 Operational channel availability check Adjacent channel validation (N+\-1) Adjacent channel sensing for TG1 beacon and wireless microphone is needed to protect incumbent operation from WRAN out-of-band emission in adjacent channels Sensing needs to be done during quiet periods on channel N, and possibly on channels N+/-2 if WRAN operation exists to avoid incumbents being masked by WRAN signal spill-over from either side [Is there a place where N+2 can still operate without interfering with incumbent on N+1but would mask this operation where the CPE on N is located?] Where do we consider the effect of poor channel selectivity on the RF sensing path that would mask incumbent on channel K because of IF filter leakage from signal on K+\-1? Gerald Chouinard, CRC Gerald Chouinard

Operational channel availability check March 2007 doc.: IEEE 802.22-07/0zzzr0 November 2007 Operational channel availability check Adjacent channel validation (N+\-1) Base station cannot operate on N if there is wireless microphone operation on N+/-1 within R3 from the BS For distances larger than R3 from the BS, CPEs need to reduce power or change frequency if it is within R4 from wireless microphone operation to protect it from CPE spill-over For smaller distances from wireless microphone operation, CPEs cannot reduce power sufficiently to keep contact with the base station and need to change frequency Gerald Chouinard, CRC Gerald Chouinard

Backup channels availability check March 2007 doc.: IEEE 802.22-07/0zzzr0 November 2007 Backup channels availability check Co-channel validation (K) Co-channel sensing needs to be done during quiet periods on channel K, and possibly on channels K+/-1 if WRAN operation exists (see leakage from WRAN out-of-band emission on adjacent channels in previous slides) Where do we consider the effect of poor channel selectivity on the RF sensing path that would mask incumbent on channel K because of IF filter leakage from K+\-1? Base station will not be able to operate co-channel if a wireless microphone operation is within R1 from the BS For distances larger than R1 from the base station, CPEs will need to reduce power or change frequency if they are within R2 from wireless microphone operation to protect it For smaller distance from wireless microphone operation, CPE cannot reduce power sufficiently to keep contact with the base station and will need to change frequency Gerald Chouinard, CRC Gerald Chouinard

Backup channel availability check March 2007 doc.: IEEE 802.22-07/0zzzr0 November 2007 Backup channel availability check Adjacent channel validation (K+\-1) Adjacent channel sensing for TG1 beacon and wireless microphone is needed to protect incumbent operation from eventual WRAN out-of-band emission in adjacent channels Sensing needs to be done during quiet periods on channel K, and possibly on channels K+/-2 if WRAN operation exists to avoid incumbents being masked by WRAN signal spill-over from either side [Is there a place where K+2 can still operate without interfering with incumbent on K+1but would mask this operation where the CPE on K is located?] Where do we consider the effect of poor channel selectivity on the RF sensing path that would mask incumbent on channel K because of IF filter leakage from signal on K+\-1? Gerald Chouinard, CRC Gerald Chouinard

Backup channel availability check March 2007 doc.: IEEE 802.22-07/0zzzr0 November 2007 Backup channel availability check Adjacent channel validation (K+\-1) Base station will not be able to operate on K if there is wireless microphone operation on K+/-1 within R3 from the BS For distances larger than R3 from the BS, CPEs will need to reduce power or change frequency if they are within R4 from a wireless microphone operation to protect it from CPE spill-over For smaller distances from wireless microphone operation, CPEs cannot reduce power sufficiently to keep contact with the base station and will need to change frequency Gerald Chouinard, CRC Gerald Chouinard