Doc.: IEEE 802.11-07/2359r0 Submission September 2007 David Britz AT&T LabsSlide 1 Proposed ITU/WRC Spectrum And Usage Allocation For Terahertz Frequencies

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


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


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


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


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


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


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


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


September 2007


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


German Amateur radioAllocations444 – 453 GHz510 – 546 GHz711 – 730 GHz909 – 926 GHz945 – 951 GHzFrequencies above 956 GHz

FCC Boundary Unlicensed

September 2007


Slide 10

doc.: IEEE 802.11-07/2359r0

Submission

The colored bands are the tunable receivers that will be used on ALMA:-


ALMAAtacama Large Millimeter Array

Science Frequencies

FCC Boundary Unlicensed

September 2007


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


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


Slide 13

doc.: IEEE 802.11-07/2359r0

Submission


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?

September 2007


Slide 14

doc.: IEEE 802.11-07/2359r0

Submission

Thank you

September 2007


Slide 15

doc.: IEEE 802.11-07/2359r0

Submission

Link Performance

Link Performance BER BER 1e-6* 1e-6* 1e-6* 1e-6* 1e-6* 1e-6*

Up/Down link margin dB

Spreading Bandwidth GHz

Frequency Span GHz 25 45 20 20 50 50

Processing Gain dB

Range Meters

Interference

Documents

Doc.: IEEE 802.11-07/2359r0 Submission September 2007 David Britz AT&T LabsSlide 1 Proposed ITU/WRC Spectrum And Usage Allocation For Terahertz Frequencies