doc.: ieee 802.22-08/0152r1 submission june 2008 gerald chouinard, crcslide 1 incumbent database...

Gerald Chouinard, CRC

Slide 1

doc.: IEEE 802.22-08/0152r1

Submission

June 2008

Incumbent database query

IEEE P802.22 Wireless RANs Date: 2008-06-04

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].>


Slide 2

doc.: IEEE 802.22-08/0152r1

Submission

June 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, the antenna height

(AGL), the antenna azimuth and horizontal pattern 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


Slide 3

doc.: IEEE 802.22-08/0152r1

Submission

June 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 still 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


Slide 4

doc.: IEEE 802.22-08/0152r1

Submission

June 2008


• A similar incumbent database query will need to be made for the WRAN base station as part of its planning process to enquire about the possible EIRP caps that would exist for the base station in various channels given its location, antenna height (AGL), azimuth and pattern.

• This query for the BS would be similar to a query for a CPE except that the antenna parameters would be different.

• Such query for the BS will need to be repeated to keep apace of any change in the incumbent environment that may result in a change in EIRP cap in various channels. This could be covered by the “push” technology proposed by Samsung

• The BS will have to abide by the EIRP cap if it wants to continue operating in the given channel: reduce its coverage, change its modulation, etc. … or change channel.


Slide 5

doc.: IEEE 802.22-08/0152r1

Submission

June 2008


• The following slides present an example of incumbent database query for a CPE 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


Slide 6

doc.: IEEE 802.22-08/0152r1

Submission

June 2008

Noise limited contour

41 dB(uV/m)

<= DTV <= WRAN

Alternate channels interference case when CPE is inside the DTV contour


Slide 7

doc.: IEEE 802.22-08/0152r1

Submission

June 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)

Max

imu

m a

llo

wed

CP

E E

IRP

(d

BW

)

24 km

15 km

8.6 km

4.6 km

UHF TV channels

-30

-25

-20

-15

-10

-5

0

5

10

15

20

14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50

DTV RXSaturation- 8 dBm

Max. EIRP

4 Watts31 km

1st adjacent channel inside contour

1st adjacent channel outside contour


Slide 8

doc.: IEEE 802.22-08/0152r1

Submission

June 2008

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


Slide 9

doc.: IEEE 802.22-08/0152r1

Submission

June 2008

DTV incumbent environment at CPE-1

Channels on wich TV transmitters exist within interference distance

16 26 34 44 …

TX Latitude (deg.) 44.2 44.2 45.7 47.1

TX Longitude (deg.) -78.1 -82.2 -80.4 -82.1

TX ERP (dBW) 60 50 55 60

TX Antenna height (m) 300 275 250 280

Distance to closest DTV TX 210 km 140 km 5 km 132 km

Field strength level produced at device

30 dBuV/m

40 dBuV/m

123 dBuV/m

45 dBuV/m

Inside protected contour? No No Yes Yes

Distance to contour if outside 15 km 1 km --- ---


Slide 10

doc.: IEEE 802.22-08/0152r1

Submission

June 2008

-30

-20

-10

0

10

20

30

40

50

14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50

UHF TV channels

Ma

xim

um

allo

we

d C

PE

EIR

P (

dB

m)

Max. EIRP4 Watts31 km

DTV RXSaturation

- 8 dBm

24 km

15 km

8.6 km

4.6 km

Maximum allowed EIRP at CPE-1in various UHF channels

(4 watt EIRP limit and co-channel consideration)

Radioastronomy

Reduced reach of the CPE resulting

from its lower EIRP


Slide 11

doc.: IEEE 802.22-08/0152r1

Submission

June 2008

-30

-20

-10

0

10

20

30

40

50

14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50

UHF TV channels

Ma

xim

um

allo

we

d C

PE

EIR

P (

dB

m)


DTV RXSaturation

- 8 dBm

24 km

15 km

8.6 km

4.6 km

-30

-20

-10

0

10

20

30

40

50

14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50

UHF TV channels

Ma

xim

um

allo

we

d C

PE

EIR

P (

dB

m)


DTV RXSaturation

- 8 dBm

24 km

15 km

8.6 km

4.6 km


Co-channel and taboo channels consideration

DTV taboo channels for CPEs inside protected contour (ATSC A/74 )


Slide 12

doc.: IEEE 802.22-08/0152r1

Submission

June 2008

-30

-20

-10

0

10

20

30

40

50

14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50

UHF TV channels

Ma

xim

um

allo

we

d C

PE

EIR

P (

dB

m)


DTV RXSaturation

- 8 dBm

24 km

15 km

8.6 km

4.6 km


Co-channel, taboo and 3rd intermod consideration

3rd order intermod from Ch 34 into Ch

44


Slide 13

doc.: IEEE 802.22-08/0152r1

Submission

June 2008

Quiery results per WRAN device location (at CPE-1)

Channel # 14 15 16 17 18 19 20 21 22 23 24 25 26

TX cap (dBm) 36 36 36 36 36 26 26 36 36 36 36 36 2

Channel # 27 28 29 30 31 32 33 34 35 36 37 38 39

TX cap (dBm) 36 36 26 26 27 18 4 -99 4 18 -99 34 10

Channel # 40 41 42 43 44 45 46 47 48 49 50 51

TX cap (dBm) 34 27 18 4 -99 4 18 27 26 26 36 36

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


Slide 14

doc.: IEEE 802.22-08/0152r1

Submission

June 2008

Aggregation of quiery results per WRAN cell at BS

Channel 14 15 16 17 18 19 20 21 22 23 24 25 26 …

BS TX cap (dBm) 50 50 -99 50 50 50 50 50 50 50 50 50 40 …

CPE 1 TX cap (dBm) 36 36 -99 36 36 26 26 36 36 36 36 36 2 …

CPE 2 TX cap (dBm) 36 36 -99 36 36 24 36 36 36 19 36 21 -99

CPE 3 TX cap (dBm) 36 36 -99 36 36 25 36 27 26 19 36 26 3

CPE 4 TX cap (dBm) 36 36 -99 36 36 36 36 36 15

CPE 5 TX cap (dBm) 36 36 -99 36 36 36 -99

CPE 6 TX cap (dBm) 36 36 -99 36 36 5

CPE 7 TX cap (dBm) 36 36 -99 36 -99

CPE 8 TX cap (dBm) 36 36 -99 36 -99

…

Result of data fusion:- prioritization of the TV channels to be used:

- operating channel- backup channel list- candidate channel list


Slide 15

doc.: IEEE 802.22-08/0152r1

Submission

June 2008

-30

-20

-10

0

10

20

30

40

50

14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50

UHF TV channels

Ma

xim

um

allo

we

d C

PE

EIR

P (

dB

m)


DTV RXSaturation

- 8 dBm

24 km

15 km

8.6 km

4.6 km


Co-channel, taboo, 3rd intermod and direct pickup

Protection of cable-ready consumer electronic equipment

(Direct pickup interference)if present within 110 m


Slide 16

doc.: IEEE 802.22-08/0152r1

Submission

June 2008

WRAN CPE EIRP Profile to protect NTSC receivers

Note that the taboo channel situation is more difficult with analog television such as NTSC

Max

imu

m a

llo

wed

CP

E E

IRP

(d

BW

)

24 km

15 km

8.6 km

4.6 km

UHF TV channels

-30

-25

-20

-15

-10

-5

0

5

10

15

20

14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50

DTV RXSaturation- 8 dBm

Max. EIRP

4 Watts31 km

1st adjacent channel inside contour

1st adjacent channel outside contour

doc.: ieee 802.22-08/0152r1 submission june 2008 gerald chouinard, crcslide 1 incumbent database...

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