spectrum engineering branch industry canada march, 2002

March 2002

Rebecca Chan, Industry Canada

Slide 1

doc.: IEEE 802.11-RR-02/036

Submission

Simulation on Aggregate Interference from Wireless Access Systems including RLANs into Earth

Exploration-Satellite Service in the5250-5350 MHz Band

Spectrum Engineering Branch

Industry Canada

March, 2002

March 2002


Slide 2

doc.: IEEE 802.11-RR-02/036

Submission

BACKGROUND

March 2002


Slide 3

doc.: IEEE 802.11-RR-02/036

Submission

Current Canada/United States/CEPT provisions for RLAN applications

5725 5150 5250 54605350 56505470 5570 5850 MHz

LE-LANs permitted through

Footnote C39A

LE-LANs permitted through

Footnote C39A

UNII devices permitted

under Part 15 rules

UNII devices permitted

underPart 15

CEPT MOBILE SERVICE:RLAN devices

MOBILE SERVICE:RLAN devices

March 2002


Slide 4

doc.: IEEE 802.11-RR-02/036

Submission

Current ITU Allocation

FSS(E-s)

EESS

MARITIME RADIONAV

5725 MHz5150 5250 54605350 56505470

ARNS ARNS

RADIOLOCRadiolocationRADIOLOC

Amateur

SRS Srs(deep space)

RADIONAV

5570

Note: ALL CAPS=PRIMARY ALLOCATION

March 2002


Slide 5

doc.: IEEE 802.11-RR-02/036

Submission

WRC-03 consideration

MS/ms – RLANs MS/ms – RLANs

FS/fs – FWA (R3)

EESS

FSS(E-s)

EESS

MARITIME RADIONAV

5725 MHz5150 5250 54605350 56505470

ARNS ARNS

RADIOLOCRadiolocationRADIOLOC

Amateur

SRS Srs(deep space)

RADIONAV

5570

SRS

RADIOLOCATION

March 2002


Slide 6

doc.: IEEE 802.11-RR-02/036

Submission

5850 MHz

CEPT

5725 MHz

MS/ms – RLANs MS/ms – RLANsFS/fs – FWA

(R3)

EESS

FSS(E-s)

EESS

MARITIME RADIONAV

5150 5250 54605350 56505470

ARNS ARNS

RADIOLOCRADIOLOC

Amateur

SRSSrs

(deep space)

RADIONAV

5570

SRS

RADIOLOCATION

LE-LAN: Footnote C39ALE-LANs

Footnote C39A

UNII : Part 15 rules UNII: Part 15

MS MS

Overall Comparison of Allocations and provisions for RLANs Overall Comparison of Allocations and provisions for RLANs and other services in the 5GHz rangeand other services in the 5GHz range

March 2002


Slide 7

doc.: IEEE 802.11-RR-02/036

Submission

Current Canada/United States/CEPT technical rules for RLAN applications

5725 5150 5250 54605350 56505470 5570 5850 MHz

CEPT Indoor OnlyEIRP = 200 mW

ATPC, DFS

Indoor/OutdoorEIRP = 1WATPC, DFS

Indoor Only

EIRP = 200 mW

Indoor/OutdoorTx Power=1W

EIRP=4W

Indoor/OutdoorTx Power =250 mW

EIRP = 1W

Indoor OnlyEIRP =200 mW

Indoor/OutdoorTx Power= 1W

EIRP= 4W

Indoor/OutdoorTx Power= 250 mW

EIRP = 1W

March 2002


Slide 8

doc.: IEEE 802.11-RR-02/036

Submission

Characteristics of EESS

March 2002


Slide 9

doc.: IEEE 802.11-RR-02/036

Submission

Characteristics of EESS in the 5GHz range

• Radar scatterometers– useful for determining the roughness of large objects

such as ocean waves

• Radio altimeters– used to determine the height of the Earth's land and

ocean surfaces

• Imaging radars (synthetic aperture radars) – used to produce high resolution images of land and

ocean surfaces.

• In this analysis only one of the imaging radars (SAR 4-most sensitive) and altimeters were examinedMS/ms – RLANs

FS/fs – FWA (R3)

EES

5250 5350 MHz

RADIOLOC

SRS

March 2002


Slide 10

doc.: IEEE 802.11-RR-02/036

Submission

Characteristics of SARs in the 5 GHz rangeParameter SAR 2 SAR 3 SAR 4

Orbital Altitude 600 km (circular) 400 km (circular) 400 km (circular)

Orbital inclination 57 degrees 57 degrees 57 degrees

Frequency 5405 MHz 5405 MHz 5300 MHz

Peak Radiated Power 4800 W 1700 W 1700 W

Pulse Bandwidth 310 MHz 310 MHz 40 MHz

Antenna Orientation 20-38 deg from nadir 20-55 deg from nadir

20-55 deg from nadir

Receiver Noise Figure 4.62 dB 4.62 dB 4.62 dB

Footprint 164.3 km2 225.3 km2 76.5 km2

Receiver Bandwidth 356.5 MHz 356.5 MHz 46 MHz

Noise Power -113.84 dBW -113.84 dBW -122.73 dBW

Interference Threshold -119.84 dBW -119.84 dBW -128.73 dBW

Source: ITU-R Doc 8A-9B/98

March 2002


Slide 11

doc.: IEEE 802.11-RR-02/036

Submission

Characteristics of outdoor WAS/RLANs

March 2002


Slide 12

doc.: IEEE 802.11-RR-02/036

Submission

Outdoor WAS in the 5250-5350 MHz RangeParameter Value

Frequency 5.3 GHz

Bandwidth 20 MHz

Antenna Gain Pattern – azimuth plane Omnidirectional(for simulation purposes)

Antenna Gain pattern – elevation plane

Implicit within proposed EIRP mask to be shown later

Antenna tilt 0 degrees

Cell radius 1.5 km

Transmitter Power 250 mW

Scattering Coefficient 17 dB

Active Ratio 100%

March 2002


Slide 13

doc.: IEEE 802.11-RR-02/036

Submission

EIRP mask used in simulation

-14 dBW/MHz -14 dBW/MHz for 0° ≤ for 0° ≤ < 5 ° < 5 °-14 -0.711 (-14 -0.711 ( -5) dBW/MHz -5) dBW/MHz for 5° ≤ for 5° ≤ < 40 ° < 40 °-38.9 -1.222(-38.9 -1.222(-40) dBW/MHz-40) dBW/MHz for 40° ≤ for 40° ≤ < 45 ° < 45 °-45 dBW/MHz-45 dBW/MHz for for > 45 ° > 45 °

=elevation angle above the local horizon=elevation angle above the local horizonFor For <0, EIRP= -13 dBW/MHz <0, EIRP= -13 dBW/MHz

WAS EI RP mask above lo cal horiz on

-48

-46

-44

-42

-40

-38

-36

-34

-32

-30

-28

-26

-24

-22

-20

-18

-16

-14

-12

-10

-8

-6

-4

-2

0

0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90

elevation abo ve local h or iz on (d eg rees)

EIR

P (

dB

W/M

Hz

)

March 2002


Slide 14

doc.: IEEE 802.11-RR-02/036

Submission

Characteristics of indoor WAS/RLANs

March 2002


Slide 15

doc.: IEEE 802.11-RR-02/036

Submission

Characteristics of Indoor WAS systemsIndoor Type 1 Indoor Type 2

Parameter Value Value

Frequency 5.3 GHz 5.3 GHz

Bandwidth 20 MHz 20 MHz

Antenna Isotropic (for simulation purposes)

Isotropic (for simulation purposes)

Antenna gain 0 dBi 0 dBi

Transmitter power

250 mW 200 mW

Building loss 18 dB 18 dB

Active Ratio 100% 100%

March 2002


Slide 16

doc.: IEEE 802.11-RR-02/036

Submission

Distribution of WAS/RLANs

March 2002


Slide 17

doc.: IEEE 802.11-RR-02/036

Submission

Distribution of WAS/RLANs• Based on population data from the UN, cell radius of WAS/RLANs

and perceived deployment rate. Deployment factor of 30% was used. See ITU-R Doc. 8A-9B/83

• City A (extremely large city)– Population = 17.6 million– Include effects of stations operating in sub-urban areas surrounding the

city as well as to simulate effects of aggregate interference from stations operating in near-by cities, the radius was extended from 54 km to approximately 81 km.

• City B (medium size city) – Population = 3.7 million– Radius of this city = approximately 12 km. An actual radius of 18 km

was used to account for effects from stations operating in sub-urban areas as well as effects from near-by cities.

March 2002


Slide 18

doc.: IEEE 802.11-RR-02/036

Submission

Distribution of WAS/RLANsCase 1 Case 2 Case 3

Indoor Indoor Type 1 Indoor Type 2 Indoor Type 1

Number of active systems 440 440 440

Deployment Area (km2) 76.5 76.5 76.5

Density (number of active systems/km2)

5.75 5.75 5.75

Outdoor Large cityCity A

Large cityCity A

Medium cityCity B

Number of active systems 870 870 43

Deployment Area (km2) 13122 13122 648

Density (number of active systems/km2)

0.066 0.066 0.066

March 2002


Slide 19

doc.: IEEE 802.11-RR-02/036

Submission

Methodology• Within each cell:

– one station transmitting at all times • One-third of all transmitters has an additional scattering coefficient of 17

dB • 3dB polarization loss for outdoor systems• 0dB polarization loss for indoor systems• no atmospheric attenuation is assumed• The satellite was simulated to run for a period of 30 days, the period of

time in which the EESS would receive maximum interference was then revisited with time steps of 200 milliseconds. The results shown here represent a period of time in which the EESS would be visible by the WAS systems in a single orbit in which EESS would experience the maximum possible interference from the aggregate interference of WAS.

• Free space propagation• Building loss = 18 dB

March 2002


Slide 20

doc.: IEEE 802.11-RR-02/036

Submission

Simulation

March 2002


Slide 21

doc.: IEEE 802.11-RR-02/036

Submission

Results of simulation

March 2002


Slide 22

doc.: IEEE 802.11-RR-02/036

Submission

Aggregate interference from indoor and outdoor WAS into SAR 4 at 20 degrees from nadir

Aggregate interference from WAS into SAR 4 at 20degree from nadir

-200

-190

-180

-170

-160

-150

-140

-130

-120

-110

-100

0 60000 120000 180000 240000 300000 360000 420000 480000 540000 600000 660000 720000

milliseconds

I dB

W/M

Hz I Criteria

Case 1

Case 2

Case 3

Case 1 = -142.9 dBW/MHzCase 2 = -143.8 dBW/MHzCase 3 = -143.9 dBW/MHz

Case 1: Iaggregate exceeds Icriteria for approximately 1.6 secondsCase 2: I aggregate exceeds I criteria for approximately 1.4 secondsCase 3: I aggregate exceeds I criteria for approximately 1 second

Case 1

Case 2

Case 3

March 2002


Slide 23

doc.: IEEE 802.11-RR-02/036

Submission

Aggregate interference from indoor and outdoor WAS into SAR 4 at 55 degrees from nadir

Aggregate Interference from WAS into SAR4 operating at 55 degrees from nadir

-200

-190

-180

-170

-160

-150

-140

-130

-120

-110

-100

0 60000 120000 180000 240000 300000 360000 420000 480000 540000 600000

millisecond

I dB

W/M

Hz

criteria Case 1

Case 2 Case 3

Case 1: Imax = -138.3 dBW/MHzCase 2: Imax = -139.1 dBW/MHzCase 3: Imax =-138.7 dBW/MHz

Case 1 and Case 2: Iaggregate exceeds Icriteria for approximately 3.2 secondsCase 3: Icriteria is exceeded for approximately 2.8 seconds

Icriteria

Case 2

Case 1

Case 3

March 2002


Slide 24

doc.: IEEE 802.11-RR-02/036

Submission

Aggregate interference from indoor and outdoor WAS into an altimeter

Aggregate interference from WAS into altimeter

-200

-190

-180

-170

-160

-150

-140

-130

-120

0 600000 1200000 1800000 2400000 3000000

milliseconds

I (d

BW

/MH

z)

I criteria

Case 1

March 2002


Slide 25

doc.: IEEE 802.11-RR-02/036

Submission

Summary of ResultEESS SAR 4 @ 20deg from nadir SAR 4 @ 55deg from nadir Altimeter

WAS(see Table 7)

Case 1 Case 2 Case 3 Case 1 Case 2 Case 3 Case 1

Interference criterion(dBW/MHz)

(100% of the time)

-145.36 -145.36 -145.36 -145.36 -145.36 -145.36 -143.05

Maximum interference(dBW/MHz)

-142.9 -143.8 -143.9 -138.3 -139.1 -138.7 --

Duration of time in which Interference > Interference criterion

1.6 sec 1.4 sec 1 sec 3.2 sec 3.2 sec 2.8 sec 0

March 2002


Slide 26

doc.: IEEE 802.11-RR-02/036

Submission

Observations

• Actual deployment of WAS indoor and outdoor is expected to be less than what is assumed in this analysis.

• The result represents worst case interference for the EESS– interference is expected to be less at any other

time.

March 2002


Slide 27

doc.: IEEE 802.11-RR-02/036

Submission

EIRP mask• Based on comparison of results between City A and City B, the EIRP mask

for outdoor WAS can be increased by at least 3 dB and the interference criterion for the SAR should still be met for the vast majority of cities in the world. Hence, the EIRP mask can be modified as follows: -11 dBW/MHz 0 <5-11 - 0.711( –5) dBW/MHz 5 < 40-35.9 - 1.222 ( - 40) dBW/MHz 40 < 45-42 dBW/MHz 45where is the elevation angle above local horizon in degrees.

• However, since a maximum EIRP of 1W (-13 dBW/MHz) is allowed, the proposed EIRP mask then becomes…

March 2002


Slide 28

doc.: IEEE 802.11-RR-02/036

Submission

Proposed EIRP mask for outdoor WAS/RLANs

-13 dBW/MHz 0 <5-13 - 0.711( –5) dBW/MHz 5 < 40-35.9 - 1.222 ( - 40) dBW/MHz 40 < 45-42 dBW/MHz 45

where is the elevation angle above local horizon in degrees.

March 2002


Slide 29

doc.: IEEE 802.11-RR-02/036

Submission

Further Simulation

March 2002


Slide 30

doc.: IEEE 802.11-RR-02/036

Submission

Further simulation• Regulatory concerns on how to enforce the

proposed outdoor EIRP mask• Simulation performed for SAR 4 operating at 55

degrees from nadir• Assumed ALL of the WAS/RLANs were pointing

upward, although still using the EIRP mask as proposed.

• Pointing angles assumed: 0 to 10 and 0 to 20 degrees

March 2002


Slide 31

doc.: IEEE 802.11-RR-02/036

Submission

Further simulationFigure 2: Interference from indoor & outdoor WAS (including the

effect of scattering) into SAR 4 (55 deg from nadir)

-200

-195

-190

-185

-180

-175

-170

-165

-160

-155

-150

-145

-140

-135

-130

-125

-120

-115

-110

-105

-100

0 100 200 300 400 500 600

seconds

I dB

W/M

Hz

0 deg

0 to 10 deg

0 to 20 deg

I criterion

23 sec

29 sec

March 2002


Slide 32

doc.: IEEE 802.11-RR-02/036

Submission

Conclusion

March 2002


Slide 33

doc.: IEEE 802.11-RR-02/036

Submission

Conclusion

• With respect to sharing between EESS and WAS/RLANs in the 5250-5350 MHz– Sharing appears to be feasible given that indoor systems have a

maximum EIRP of 250 mW and that outdoor systems employ certain technical constraints such as the EIRP mask as proposed

• With respect to sharing between EESS and WAS/RLANs in the 5470-5570 MHz range– Further studies are required to examine the impact on wideband

SARs (SAR 2 and SAR 3)

• Not covered in this presentation – sharing between WAS/RLANs and Radiolocation in the 5GHz range

spectrum engineering branch industry canada march, 2002

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