doc.: ieee 802.22-07/0462r1 submission nov. 2007 cheng shan, samsung electronics slide 1 aggregated...
TRANSCRIPT
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
Cheng Shan, Samsung Electronics
Slide 2
doc.: IEEE 802.22-07/0462r1
Submission
Abstract
• In this document, we illustrate the aggregated interference from CPEs through simulations
Nov. 2007
Cheng Shan, Samsung Electronics
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
Cheng Shan, Samsung Electronics
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
Cheng Shan, Samsung Electronics
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
Cheng Shan, Samsung Electronics
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
Cheng Shan, Samsung Electronics
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
Cheng Shan, Samsung Electronics
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
Cheng Shan, Samsung Electronics
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
CPE antenna misalignment deviation = 10
CPE antenna misalignment deviation = 30
Nov. 2007
Cheng Shan, Samsung Electronics
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
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 =1km
CPE antenna misalignment deviation = 0
CPE antenna misalignment deviation = 10
CPE antenna misalignment deviation = 30
Nov. 2007
Cheng Shan, Samsung Electronics
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
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 =2km
CPE antenna misalignment deviation = 0
CPE antenna misalignment deviation = 10
CPE antenna misalignment deviation = 30
Nov. 2007
Cheng Shan, Samsung Electronics
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
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 =3.108km
CPE antenna misalignment deviation = 0
CPE antenna misalignment deviation = 10
CPE antenna misalignment deviation = 30
Nov. 2007
Cheng Shan, Samsung Electronics
Slide 13
doc.: IEEE 802.22-07/0462r1
Submission
4W BS, d = 0km.
0 10 20 30 40 50 6010
-2
10-1
100
Number of CPEs in a cell
Pro
babi
lity
of c
ausi
ng a
ggre
gate
d in
terf
eren
ce4WBS, distance btw cell edge and TV protect contour =0km
CPE antenna misalignment deviation = 0
CPE antenna misalignment deviation = 10
CPE antenna misalignment deviation = 30
Nov. 2007
Cheng Shan, Samsung Electronics
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
Number of CPEs in a cell
Pro
babi
lity
of c
ausi
ng a
ggre
gate
d in
terf
eren
ce4WBS, distance btw cell edge and TV protect contour =1km
CPE antenna misalignment deviation = 0
CPE antenna misalignment deviation = 10
CPE antenna misalignment deviation = 30
Nov. 2007
Cheng Shan, Samsung Electronics
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
Number of CPEs in a cell
Pro
babi
lity
of c
ausi
ng a
ggre
gate
d in
terf
eren
ce4WBS, distance btw cell edge and TV protect contour =2km
CPE antenna misalignment deviation = 0
CPE antenna misalignment deviation = 10
CPE antenna misalignment deviation = 30
Nov. 2007
Cheng Shan, Samsung Electronics
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
Number of CPEs in a cell
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
CPE antenna misalignment deviation = 0
CPE antenna misalignment deviation = 10
CPE antenna misalignment deviation = 30
Nov. 2007
Cheng Shan, Samsung Electronics
Slide 17
doc.: IEEE 802.22-07/0462r1
Submission
probability of causing AI vs. distance btw WRAN cell edge and TV protect contour
• 100W BS
• 4W BS
Nov. 2007
Cheng Shan, Samsung Electronics
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
lity
of c
ausi
ng a
ggre
gate
d in
terf
eren
ceCPE antenna misalignment deviation =0
CPE Number = 5CPE Number = 10
CPE Number = 20
CPE Number = 30
CPE Number = 40
CPE Number = 50CPE Number = 60
Nov. 2007
Cheng Shan, Samsung Electronics
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
Distance btw cell edge and TV protect contour (km)
Pro
babi
lity
of c
ausi
ng a
ggre
gate
d in
terf
eren
ceCPE antenna misalignment deviation =10
CPE Number = 5CPE Number = 10
CPE Number = 20
CPE Number = 30
CPE Number = 40
CPE Number = 50CPE Number = 60
Nov. 2007
Cheng Shan, Samsung Electronics
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
Distance btw cell edge and TV protect contour (km)
Pro
babi
lity
of c
ausi
ng a
ggre
gate
d in
terf
eren
ceCPE antenna misalignment deviation =30
CPE Number = 5CPE Number = 10
CPE Number = 20
CPE Number = 30
CPE Number = 40
CPE Number = 50CPE Number = 60
Nov. 2007
Cheng Shan, Samsung Electronics
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
Distance btw cell edge and TV protect contour (km)
Pro
babi
lity
of c
ausi
ng a
ggre
gate
d in
terf
eren
ceCPE antenna misalignment deviation =0
CPE Number = 5CPE Number = 10
CPE Number = 20
CPE Number = 30
CPE Number = 40
CPE Number = 50CPE Number = 60
Nov. 2007
Cheng Shan, Samsung Electronics
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
Distance btw cell edge and TV protect contour (km)
Pro
babi
lity
of c
ausi
ng a
ggre
gate
d in
terf
eren
ceCPE antenna misalignment deviation =10
CPE Number = 5CPE Number = 10
CPE Number = 20
CPE Number = 30
CPE Number = 40
CPE Number = 50CPE Number = 60
Nov. 2007
Cheng Shan, Samsung Electronics
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
Distance btw cell edge and TV protect contour (km)
Pro
babi
lity
of c
ausi
ng a
ggre
gate
d in
terf
eren
ceCPE antenna misalignment deviation =30
CPE Number = 5CPE Number = 10
CPE Number = 20
CPE Number = 30
CPE Number = 40
CPE Number = 50CPE Number = 60
Nov. 2007
Cheng Shan, Samsung Electronics
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
Cheng Shan, Samsung Electronics
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.