Doc.: IEEE 802.11-07/2359r0 Submission September 2007 David Britz AT&T LabsSlide 1 Proposed ITU/WRC...
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Transcript of Doc.: IEEE 802.11-07/2359r0 Submission September 2007 David Britz AT&T LabsSlide 1 Proposed ITU/WRC...
September 2007
David Britz AT&T Labs
Slide 1
doc.: IEEE 802.11-07/2359r0
Submission
Proposed ITU/WRC Spectrum And Usage Allocation For Terahertz Frequencies
Date: 2007-08-29
Name Affiliations Address Phone email David Britz AT&T 180 Park Ave
Florham Park 973 236 6913 [email protected]
Authors:
September 2007
David Britz AT&T Labs
Slide 2
doc.: IEEE 802.11-07/2359r0
Submission
Abstract
With out much fanfare the ITU/WRC organization have proposed and allocated broad spans of the most usable
Terahertz spectrum for exclusive scientific/satellite and amateur radio usage, and surprisingly to the apparent exclusion of commercial radio market
opportunities! How will loss of this currently unlicensed spectrum effect near future
development of small-cell GigE wireless networks
?
September 2007
David Britz AT&T Labs
Slide 3
doc.: IEEE 802.11-07/2359r0
Submission
Microwave Radiation Is Focused by a Lens On Steel Wool, Heats It to Burning Temperature
My thanks to Don Schultz, The Boeing Company
Demonstrations of microwaves refractive “optical” propertiesMalcom W. P. Strandberg Professor of Physics, Emeritus MITPublished in Life Magazine November 1945
Plastic Lens
9.6GHz 3.3cm wavelength microwave horn, 100 watts average power ,1 µs pulse 1000Hz
Proof of the common physics
September 2007
David Britz AT&T Labs
Slide 4
doc.: IEEE 802.11-07/2359r0
Submission
Terahertz Link Budget – Work In ProcessTransmitter Units Channels Channels Channels Channels Channels Channels
Transmission Band GHz 275-300 355-400 490-510 690 -710 800-850 900-950
Wavelength (mm) MM 1.09 – 0.999 0.900- 0.749 0.611-0.587 0.434-0.422 0.374-0.352 0.333-0.315
Power (transmitted) Watts 10mW* 10mW* 10mW* 10mW* 10mW* 10mW*
Antenna Gain dB
Gain amp dB
Pointing Loss dB
Atmospheric
Path loss (Clear) dB/Km 1 1 1 1 1 1
Rain Loss (25mm/hr) dB/Km 13 12 11 9.5 9.5 9.5
Rain Loss (150mm/hr) dB/Km 50 50 45 40 39 37
Fog Loss dB/Km 2 3 4 5 5 5.2
Molecular Loss dB/km 6 10 10 50 50 75
Receiver
Antenna gain dB
Coupling Losses dB
Receiver sensitivity dBW
Receiver NF dB
•Note; Suggested near term realistic power output for room temperature transmitter, Ref. Trevor Bird CSIRO•2 Antenna diameter assumed to be symmetrical and 10mm for all channels
September 2007
David Britz AT&T Labs
Slide 5
doc.: IEEE 802.11-07/2359r0
Submission
Companies are beginning to produce THz transceivers
It took many years for cost effectivespectrum and power efficient Cell - phone transceivers to catch on and become the vast market theyare today.
My thanks to Phair Corporation for the use of their published material
September 2007
David Britz AT&T Labs
Slide 6
doc.: IEEE 802.11-07/2359r0
Submission
100 THz3 µm
10 THz
30 µm
1 THz
0.30 mm
100 GHz3 mm
10 GHz30 mm
0.1
100.0
1000
1.0
10.0
ATTEN
UA
TIO
N
dB
/Km
DRIZZL 0.25mm/Hr
Heavy Rain 25mm/Hr
Deluge 150mm/Hr
FOG (0.1gm3
Visibility 50m
20”
1Atm
H2O
H2O
H2O
H2O
CO2
CO2
CO2
O2
O2
H2O
1000 THz0.3µm
Visible MillimeterSub-MillimeterInfrared 0.01
O3
Avoiding Deep Molecular Absorption Bands FCC 300GHzRadio Boundary
Spectrum of interest to ITU/WRC/IARU275 -1000GHz
September 2007
David Britz AT&T Labs
Slide 7
doc.: IEEE 802.11-07/2359r0
Submission
Water Vapor (6g/m³) and Oxygen Molecular and atmospheric Attenuation Plot
Source; Interim Meeting Of The IARU Region 1 VHF/Uhf/Microwave Committee Vienna February 24 -25.2.2007
September 2007
David Britz AT&T Labs
Slide 8
doc.: IEEE 802.11-07/2359r0
Submission
“The following are the bands preferred for the IARU Amateur and Amateur-Satellite Services, they are within the “better bands” identified and are free of other radio-frequency interference and bands that are of the greatest importance to radio astronomy service. Primary allocations within these bands appears feasible, and the bands from 510 GHz and below are the most ideal for the amateur services, based on atmospheric attenuation, and where the bulk of the allocations within these bands is preferred.”
Better bands Attenuation
(GHz) (dB/km)
275 - 300 6
355 - 400 10
490 - 510 10
690 - 710 50
800 - 850 50
Preferred bandsfor the amateur services (GHz)
Available bandwidth(GHz)
280 - 294 14
358 - 363 5
365 - 371 6
389 - 400 11
493 - 496 3
506 - 510 4
692 - 710 18
810 - 850 40
Source; Interim Meeting Of The IARU Region 1 VHF/Uhf/Microwave Committee Vienna February 24 -25.2.2007
September 2007
David Britz AT&T Labs
Slide 9
doc.: IEEE 802.11-07/2359r0
Submission
Shared spectrum proposal between IARU, Radio Astronomy and passive Earth
Exploration & Space Research Services
IARU and German Amateur Radio Allocations overlaid
Spectral Data from ALMAAtacama Large Millimeter Array
Source; Interim Meeting Of The IARU Region 1 VHF/Uhf/Microwave Committee Vienna February 24 -25.2.2007
German Amateur radioAllocations444 – 453 GHz510 – 546 GHz711 – 730 GHz909 – 926 GHz945 – 951 GHzFrequencies above 956 GHz
FCC Boundary Unlicensed
September 2007
David Britz AT&T Labs
Slide 10
doc.: IEEE 802.11-07/2359r0
Submission
The colored bands are the tunable receivers that will be used on ALMA:-
Source; Interim Meeting Of The IARU Region 1 VHF/Uhf/Microwave Committee Vienna February 24 -25.2.2007
ALMAAtacama Large Millimeter Array
Science Frequencies
FCC Boundary Unlicensed
September 2007
David Britz AT&T Labs
Slide 11
doc.: IEEE 802.11-07/2359r0
Submission
•WRC-2000 extended the mandate of the ITU Radio Regulations from 275 - 400 GHz and then to 275 - 1000 GHz but did not make any specific allocations to “radio-communication services”.
•The WRC-2000 conference revised a footnote listing bands above 275 GHz used by passive services that should be avoided by “active” radio-communication services.
•Amateur Services will require allocations of sufficient bandwidth to permit experimentation spaced throughout the range 275 - 1000 GHz. Studies of Amateur Services' requirements in this range should be completed in preparation for WRC-10.
•The radio astronomy service has indicated a desire to share spectrum with the Amateur Services in this range.
•The Amateur Services seek to obtain not less than 75 GHz of spectrum in the band 275 - 1000 GHz in
order to provide for future development of the Amateur Services utilizing new technologies.
•The ITU (2007) has begun studies of frequency bands above 3000 GHz (3 THz), considered the
beginning of the optical spectrum.
ITU/WRC/ IARU Terahertz 2000-2010 FocusITU – International Telecommunications UnionWRC – World Radiocommunications Conference 2000 -2010IARU – International Amateur Radio Union Region 1: Europe, Africa, Middle East and Northern Asia
September 2007
David Britz AT&T Labs
Slide 12
doc.: IEEE 802.11-07/2359r0
Submission
How will loss of this currently unlicensed spectrum effect near
future commercial development of small-cell GigE+ wireless networks?
The recognition by the ITU of value and utility of the terahertz spectrum is both innovative and proactive!
The give away to the IARU of this precious spectrum is unexpected, capricious and irreconcilable with the evolution of future broadband wireless networks
BUT
•Terahertz Market potential?•R&D for non-available international spectrum?•Transceiver development/Vendor engagement?•ITU policy ignores spectrum sharing advantages of small-cell THz networks
September 2007
David Britz AT&T Labs
Slide 13
doc.: IEEE 802.11-07/2359r0
Submission
Source; Interim Meeting Of The IARU Region 1 VHF/Uhf/Microwave Committee Vienna February 24 -25.2.2007
Conclusions•Move to define and dominate Terahertz spectrum is already well underway – outside of the USA.
•The best Terahertz spectrum is being carved up among science, satellite and amateur radio interests.
•Commercial interests in Terahertz spectrum utilization appear to be actively and intentionally excluded by ITU/WRC decision policies.
• Does the 802/802.11 VHT community need to pay attention, actively engage and or push back via FCC on these proposed exclusive ITU spectrum allocations?
•What will happen if we don’t?