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:
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Gerald Chouinard, CRC
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
Gerald Chouinard, CRC
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
Gerald Chouinard, CRC
Slide 4
doc.: IEEE 802.22-08/0152r1
Submission
June 2008
Incumbent dabase query (cont’d)
• 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.
Gerald Chouinard, CRC
Slide 5
doc.: IEEE 802.22-08/0152r1
Submission
June 2008
Incumbent dabase query (cont’d)
• 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
Gerald Chouinard, CRC
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
Gerald Chouinard, CRC
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
Gerald Chouinard, CRC
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
Gerald Chouinard, CRC
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 --- ---
Gerald Chouinard, CRC
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
Gerald Chouinard, CRC
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)
Max. EIRP4 Watts31 km
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)
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
Co-channel and taboo channels consideration
DTV taboo channels for CPEs inside protected contour (ATSC A/74 )
Gerald Chouinard, CRC
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)
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
Co-channel, taboo and 3rd intermod consideration
3rd order intermod from Ch 34 into Ch
44
Gerald Chouinard, CRC
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
Gerald Chouinard, CRC
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
Gerald Chouinard, CRC
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)
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
Co-channel, taboo, 3rd intermod and direct pickup
Protection of cable-ready consumer electronic equipment
(Direct pickup interference)if present within 110 m
Gerald Chouinard, CRC
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