doc.: ieee 802.22-07/0530r1 submission november 2007 gerald chouinard, crcslide 1 wireless...

November 2007

Gerald Chouinard, CRC

Slide 1

doc.: IEEE 802.22-07/0530r1

Submission

Wireless Microphone Sensing

IEEE P802.22 Wireless RANs Date: 2007-12-11

Name Company Address Phone email

Gerald Chouinard CRC 3701 Carling Avenue, Ottawa, Ontario, Canada K2H 8S2

(613) 998-2500 [email protected]

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].>

November 2007


Slide 2

doc.: IEEE 802.22-07/0530r1

Submission

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.

November 2007


Slide 3

doc.: IEEE 802.22-07/0530r1

Submission

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

November 2007


Slide 4

doc.: IEEE 802.22-07/0530r1

Submission

Maximum field strength allowed before interference to wireless microphones

Transmit power: 10 dBm Typical: 10-50 mWAntenna gain: -10 dBi Typical: -2 to -6 dBiCable loss: 0 dBTransmit EIRP: -30 dBWPower Flux Density at 1 m from the microphone: -41.0 dBW/m^2Typical microphone fading due to body absorption:

26.8 dB

Wireless microphone coverage range 100 mPower Flux Density at microphone receiver: -107.8 dBW/m^2Wireless microphone receiver antenna gain: 0.0 dBiWireless microphone receiver cable loss: 0.0 dBWireless microphone receiver antenna aperture: 0.02 m^2Power at microphone receiver: -95.0 dBm (for 30 dB audio SINAD)Microphone reception protection ratio (D/U): 20.0 dBAllowed maximum level of interfering power flux density at microphone receiver:

-127.8 dBW/m^2 in 200 kHz

Allowed maximum interfering field strength 15.8 dB(uV/m) in 120 kHz

Allowed maximum interfering field strength 32.7 dB(uV/m) in 6 MHz

Body absorption and multipath fade allowance: 20-30 dB (less when diversity antennas are used)

November 2007


Slide 5

doc.: IEEE 802.22-07/0530r1

Submission

WRAN coverage and co-channel operation with wireless microphones

R1

R2

Minimum WRAN field strength: 28.8 dB(uV/m)

32.7 + Δ att_1.5m/10m dB(uV/m)

Area where, if wireless microphones

are present, the BS cannot operate on the

same TV channel

Area where, if wireless microphones are present, the nearby CPEs need to

either change frequency or reduce their transmit power

Edge of coverage of the WRAN BS (e.g., 17 km for 4 W

EIRP, 31 km for 100 W EIRP)

Area where CPEs need to change

frequency

Area where CPEs need to reduce their transmit power as a function of their distance to the wireless microphone

operation

Wireless microphone operation

R1

R2

F(50, 99.9)

F(50, 10)

November 2007


Slide 6

doc.: IEEE 802.22-07/0530r1

Submission

Operational channel availability check• Co-channel validation (N)

1. 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)

2. 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?

3. Base station cannot operate co-channel if there is a wireless microphone operation within R1 from the BS

4. 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

5. 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

November 2007


Slide 7

doc.: IEEE 802.22-07/0530r1

Submission


• 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 =>

November 2007


Slide 8

doc.: IEEE 802.22-07/0530r1

Submission

WRAN RF MaskRF Emission Masks

-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

-2.5 -1.5 -0.5 0.5 1.5 2.5

Channel Spacing

Lev

el r

elat

ive

to i

n-b

and

po

wer

den

sity

(d

B)

802.22

802.22 Ext.

Part 15.209a

Center line

November 2007


Slide 9

doc.: IEEE 802.22-07/0530r1

Submission


-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

-2.5 -1.5 -0.5 0.5 1.5 2.5

Channel Spacing

Lev

el r

elat

ive

to i

n-b

and

po

wer

den

sity

(d

B)

FCC Mask

802.22

802.22 Ext.

Part 15.209a

Center line

November 2007


Slide 10

doc.: IEEE 802.22-07/0530r1

Submission


-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

-2.5 -1.5 -0.5 0.5 1.5 2.5

Channel Spacing

Lev

el r

elat

ive

to i

n-b

and

po

wer

den

sity

(d

B)

CDN Mask

FCC Mask

802.22

802.22 Ext.

Part 15.209a

Center line

November 2007


Slide 11

doc.: IEEE 802.22-07/0530r1

Submission


-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

-2.5 -1.5 -0.5 0.5 1.5 2.5

Channel Spacing

Lev

el r

elat

ive

to i

n-b

and

po

wer

den

sity

(d

B)

CDN Relaxed Mask

CDN Relaxed Mask Ext.1


CDN Mask

FCC Mask

802.22

802.22 Ext.

Part 15.209a

Center line

November 2007


Slide 12

doc.: IEEE 802.22-07/0530r1

Submission


-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

-2.5 -1.5 -0.5 0.5 1.5 2.5

Channel Spacing

Lev

el r

elat

ive

to i

n-b

and

po

wer

den

sity

(d

B)

CDN Relaxed Mask



CDN Mask

FCC Mask

802.16

802.22

802.22 Ext.

Part 15.209a

Center line

November 2007


Slide 13

doc.: IEEE 802.22-07/0530r1

Submission

WRAN coverage and adjacent-channel operation with wireless microphones

28.8 dB(uV/m)

32.7 + 33 +Δ att _1.5m/10m

dB(uV/m)

Area where, if wireless microphones are detected, the BS

cannot operate on the adjacent TV channel

Area where, if wireless microphones are detected, the nearby CPEs need to

either change frequency or reduce their transmit power

Edge of coverage edge of the WRAN BS (e.g., 17 km for 4 W

EIRP, 31 km for 100 W EIRP)

Area where CPEs need to reduce their transmit power as a function of their distance to the wireless microphone operation or change

frequency

Wireless microphone operation

Assuming 33 dB as for

the FCC Mask

R4

R3

November 2007


Slide 14

doc.: IEEE 802.22-07/0530r1

Submission


• Adjacent channel validation (N+\-1)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

2. 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?]

3. 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?

November 2007


Slide 15

doc.: IEEE 802.22-07/0530r1

Submission


• Adjacent channel validation (N+\-1)4. Base station cannot operate on N if there is wireless

microphone operation on N+/-1 within R3 from the BS

5. 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

6. For smaller distances from wireless microphone operation, CPEs cannot reduce power sufficiently to keep contact with the base station and need to change frequency

November 2007


Slide 16

doc.: IEEE 802.22-07/0530r1

Submission

Backup channels availability check

• Co-channel validation (K)1. 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)

2. 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?

3. Base station will not be able to operate co-channel if a wireless microphone operation is within R1 from the BS

4. 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

5. 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

November 2007


Slide 17

doc.: IEEE 802.22-07/0530r1

Submission

Backup channel availability check

• Adjacent channel validation (K+\-1)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

2. 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?]

3. 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?

November 2007


Slide 18

doc.: IEEE 802.22-07/0530r1

Submission

Backup channel availability check

• Adjacent channel validation (K+\-1)4. Base station will not be able to operate on K if there is

wireless microphone operation on K+/-1 within R3 from the BS

5. 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

6. 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

doc.: ieee 802.22-07/0530r1 submission november 2007 gerald chouinard, crcslide 1 wireless...

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