Doc.: IEEE 802.22-07/0462r1 Submission Nov. 2007 Cheng Shan, Samsung Electronics Slide 1 Aggregated Interference from CPEs IEEE P802.22 Wireless RANs Date:

Nov. 2007

Cheng Shan, Samsung Electronics

Slide 1

doc.: IEEE 802.22-07/0462r1

Submission

Aggregated Interference from CPEsIEEE P802.22 Wireless RANs Date: 2007-08-23

Name Company Address Phone email Cheng Shan Samsung Electronics Korea +82 31 279 7557 [email protected]

Baowei Ji Samsung Telecom.

America USA +1-972-761-7167 [email protected]

Jinxia Cheng Samsung Electronics China +86 10 6439 0088

3133 [email protected]

Euntaek Lim Samsung Electronics Korea +82 31 279 5917 [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].>

Nov. 2007


Slide 2

doc.: IEEE 802.22-07/0462r1

Submission

Abstract

• In this document, we illustrate the aggregated interference from CPEs through simulations

Nov. 2007


Slide 3

doc.: IEEE 802.22-07/0462r1

Submission

Simulation Parameters (1)

• DTV– 1MW TV station with protect contour radius 134.2km

– TV receivers are equipped with directional antennas with front-to-back ratio 14dB

– The DTV antennas are pointing toward TV station with misalignment

• WRAN BS– Two kinds of BSs are investigated

• 4Watt BS with cell radius 16km

• 100Watt BS with cell radius 30km

– CPEs from ONE WRAN cell are investigated; the WRAN cell is tangent to the TV protect contour

Nov. 2007


Slide 4

doc.: IEEE 802.22-07/0462r1

Submission

Simulation Parameters (2)

• CPE– Uniformly distributed within the WRAN cell

– TV receivers are equipped with directional antennas with front-to-back ratio 16dB

– The CPE antennas (10m in height) are pointing toward WRAN BS with misalignment degrees, whose standard deviation is degrees (Gaussian distribution assumed)

– EIRP• keep-out distance: 3.1km

• 4W EIRP outside the keep-out distance

• Individual EIRP control for each CPE is applied for those CPEs dropped inside the keep-out distance

• Propagations– TV Station -> TV receiver: F(50,90)

– CPE -> TV receiver: F(50,10)

CPE

Nov. 2007


Slide 5

doc.: IEEE 802.22-07/0462r1

Submission

Simulation Methodology

• For each trial– N CPEs are randomly dropped in the cell, each with

– Minimum D/U ratio along the TV protected contour is recorded• If this minimum D/U ratio is less than 23 dB, aggregated interference occurs to the

incumbent TV system

• Multiple trials are repeated to find the probability of excessive aggregated interference from CPEs to incumbent TV system

• Assumption:– The path-loss attenuation is assumed to be deterministic, while it is statistical

in practice (referring the definition of F(50, 90) and F(50,10) models);

Nov. 2007


Slide 6

doc.: IEEE 802.22-07/0462r1

Submission

Simulation Scenario

TV Station

WRAN BS

WRAN CPE

TV Protect Contour

CPE Keep-out Range

BS Keep-out Range

CPE

DTV pointing to its TV station

CPE pointing to its BS with deviation .CPE

WRAN cell edge is d km away from TV protect contour

Nov. 2007


Slide 7

doc.: IEEE 802.22-07/0462r1

Submission

Antenna Pattern

-20dB

-10dB

0dB

30

210

60

240

90

270

120

300

150

330

180 0

CPE

DTV

Nov. 2007


Slide 8

doc.: IEEE 802.22-07/0462r1

Submission

Probability of causing AI vs. number of CPEs in a cell

• 100W BS

• 4W BS

Nov. 2007


Slide 9

doc.: IEEE 802.22-07/0462r1

Submission

100W BS, d = 0km.

0 10 20 30 40 50 6010

-4

10-3

10-2

10-1

100

Number of CPEs in a cell

Pro

babi

lity

of c

ausi

ng a

ggre

gate

d in

terf

eren

ce100WBS, distance btw cell edge and TV protect contour =0km

CPE antenna misalignment deviation = 0



Nov. 2007


Slide 10

doc.: IEEE 802.22-07/0462r1

Submission

100W BS, d = 1km.

0 10 20 30 40 50 6010

-4

10-3

10-2

10-1

100


Pro

babi

lity

of c

ausi

ng a

ggre

gate

d in

terf

eren





Nov. 2007


Slide 11

doc.: IEEE 802.22-07/0462r1

Submission

100W BS, d = 2km.

0 10 20 30 40 50 6010

-5

10-4

10-3

10-2

10-1


Pro

babi

lity

of c

ausi

ng a

ggre

gate

d in

terf

eren





Nov. 2007


Slide 12

doc.: IEEE 802.22-07/0462r1

Submission

100W BS, d = 3.1km.

0 10 20 30 40 50 6010

-4

10-3

10-2

10-1


Pro

babi

lity

of c

ausi

ng a

ggre

gate

d in

terf

eren

ce100WBS, distance btw cell edge and TV protect contour =3.108km




Nov. 2007


Slide 13

doc.: IEEE 802.22-07/0462r1

Submission

4W BS, d = 0km.

0 10 20 30 40 50 6010

-2

10-1

100


Pro

babi

lity

of c

ausi

ng a

ggre

gate

d in

terf

eren





Nov. 2007


Slide 14

doc.: IEEE 802.22-07/0462r1

Submission

4W BS, d = 1km.

0 10 20 30 40 50 6010

-3

10-2

10-1

100


Pro

babi

lity

of c

ausi

ng a

ggre

gate

d in

terf

eren





Nov. 2007


Slide 15

doc.: IEEE 802.22-07/0462r1

Submission

4W BS, d = 2km.

0 10 20 30 40 50 6010

-4

10-3

10-2

10-1

100


Pro

babi

lity

of c

ausi

ng a

ggre

gate

d in

terf

eren





Nov. 2007


Slide 16

doc.: IEEE 802.22-07/0462r1

Submission

4W BS, d = 3.1km.

0 10 20 30 40 50 6010

-5

10-4

10-3

10-2

10-1


Pro

babi

lity

of c

ausi

ng a

ggre

gate

d in

terf

eren

ce4WBS, distance btw cell edge and TV protect contour =3.108km




Nov. 2007


Slide 17

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Submission

probability of causing AI vs. distance btw WRAN cell edge and TV protect contour

• 100W BS

• 4W BS

Nov. 2007


Slide 18

doc.: IEEE 802.22-07/0462r1

Submission

100W BS, .0CPE

0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2

10-4

10-3

10-2

10-1

Distance btw cell edge and TV protect contour (km)

Pro

babi

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of c

ausi

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ggre

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d in

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ceCPE antenna misalignment deviation =0

CPE Number = 5CPE Number = 10

CPE Number = 20

CPE Number = 30

CPE Number = 40


Nov. 2007


Slide 19

doc.: IEEE 802.22-07/0462r1

Submission

100W BS, .10CPE

0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2

10-4

10-3

10-2

10-1


Pro

babi

lity

of c

ausi

ng a

ggre

gate

d in

terf

eren



CPE Number = 20

CPE Number = 30

CPE Number = 40


Nov. 2007


Slide 20

doc.: IEEE 802.22-07/0462r1

Submission

100W BS, .30CPE

0 0.5 1 1.5 2 2.5 3 3.5 410

-4

10-3

10-2

10-1

100


Pro

babi

lity

of c

ausi

ng a

ggre

gate

d in

terf

eren



CPE Number = 20

CPE Number = 30

CPE Number = 40


Nov. 2007


Slide 21

doc.: IEEE 802.22-07/0462r1

Submission

4W BS, .0CPE

0 0.5 1 1.5 2 2.5 310

-5

10-4

10-3

10-2

10-1

100


Pro

babi

lity

of c

ausi

ng a

ggre

gate

d in

terf

eren



CPE Number = 20

CPE Number = 30

CPE Number = 40


Nov. 2007


Slide 22

doc.: IEEE 802.22-07/0462r1

Submission

4W BS, .10CPE

0 0.5 1 1.5 2 2.5 310

-4

10-3

10-2

10-1

100


Pro

babi

lity

of c

ausi

ng a

ggre

gate

d in

terf

eren



CPE Number = 20

CPE Number = 30

CPE Number = 40


Nov. 2007


Slide 23

doc.: IEEE 802.22-07/0462r1

Submission

4W BS, .30CPE

0 0.5 1 1.5 2 2.5 3 3.5 410

-3

10-2

10-1

100


Pro

babi

lity

of c

ausi

ng a

ggre

gate

d in

terf

eren



CPE Number = 20

CPE Number = 30

CPE Number = 40


Nov. 2007


Slide 24

doc.: IEEE 802.22-07/0462r1

Submission

How much to expand for the TV contour?

• The probability of causing aggregated interference decreases significantly as the WRAN cell goes further away from the TV protect contour;

• Set a threshold as 2% probability of causing AI– 100W BS, expand 0.8 km from the original;

– 4W BS, expand 2.5 km from the original

Nov. 2007


Slide 25

doc.: IEEE 802.22-07/0462r1

Submission

Further Discussion

• The above conclusion is drawn by assuming a deterministic propagation model rather than a statistics one, i.e., assuming the pathloss is exactly the value in F(x,y) table; however, – by assuming TV Station -> TV receiver: F(50,90); CPE -> TV receiver:

F(50,10), each individual CPE has an outage probability causing excessive interference;

– aggregated interference from multiple CPEs is for sure more severe from an outage perspective;

• A statistical outage probability shall be defined together with the D/U ratio requirement;

• Further study on effect from statistical channel model is necessary.

Doc.: IEEE 802.22-07/0462r1 Submission Nov. 2007 Cheng Shan, Samsung Electronics Slide 1 Aggregated Interference from CPEs IEEE P802.22 Wireless RANs Date:

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