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Proposed ITU/WRC Spectrum And Usage Allocation For Terahertz Frequencies. Authors:. Date: 2007-08-29. Abstract.

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Proposed ITU/WRC Spectrum And Usage Allocation For Terahertz Frequencies


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proposed itu wrc spectrum and usage allocation for terahertz frequencies
Proposed ITU/WRC Spectrum And Usage Allocation For Terahertz Frequencies

Authors:

Date: 2007-08-29

David Britz AT&T Labs

abstract
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

?

David Britz AT&T Labs

slide3

Demonstrations of microwaves refractive “optical” properties

Malcom W. P. Strandberg Professor of Physics, Emeritus MIT

Published in Life Magazine November 1945

9.6GHz 3.3cm wavelength microwave

horn, 100 watts average power ,

1 µs pulse 1000Hz

Plastic Lens

Microwave Radiation Is Focused by a Lens On

Steel Wool, Heats It to Burning Temperature

My thanks to Don Schultz, The Boeing Company

Proof of the common physics

David Britz AT&T Labs

slide4

Terahertz Link Budget – Work In Process

  • 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

David Britz AT&T Labs

slide5

Terahertz & Extreme Gigahertz frequencies can propagate like radio, but be brought to a focus like light.

  • Astronomy
  • Orbital and ground based study of cold interstellar molecular clouds of singly ionized nitrogen and carbon monoxide -contributing to early galactic formation
  • Remote Sensing
  • Atmospheric sensing of pollutants and composition
  • Medical Imaging
  • Penetrates non polar materials, skin and soft tissue
  • may be a safe X-Ray replacement
  • Materials Analysis
  • THz frequencies interact aggressively with polar molecules (water), most molecules have vibration and rotational emission and absorption spectral
  • Security
  • Terahertz detectors can now detect passive emissions from human bodies and objects hidden within clothing
  • Terahertz scanners can penetrate sealed packages
  • Return spectra can identify material composition (spectral fingerprint)
  • Indoor and Outdoor Wireless LANs
  • (10-100+ Gbps)
  • Radio tags
  • Intelligent home device interface
  • Personal Space Broadband Networks

ESA -Herschel Spacecraft

100 Gigahertz

Terahertz Imaging

David Britz AT&T Labs

slide6

My thanks to Phair Corporation for the use of their published material

Companies are beginning

to produce THz transceivers

It took many years for cost effective

spectrum and power efficient Cell -

phone transceivers to catch on

and become the vast market they

are today.

David Britz AT&T Labs

slide7

O2

O2

CO2

CO2

CO2

20”

1Atm

H2O

H2O

H2O

H2O

H2O

Infrared

Millimeter

Sub-Millimeter

Spectrum of interest to ITU/WRC/IARU

275 -1000GHz

1000

FOG (0.1gm3

Visibility 50m

100.0

Deluge

150mm/Hr

Heavy Rain

25mm/Hr

10.0

ATTENUATION dB/Km

1.0

DRIZZL 0.25mm/Hr

0.1

O3

Visible

0.01

1000 THz

0.3µm

100 THz

3 µm

1 THz

0.30 mm

10 THz

30 µm

10 GHz

30 mm

100 GHz

3 mm

FCC 300GHz

Radio Boundary

Avoiding Deep Molecular Absorption Bands

David Britz AT&T Labs

slide8

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

David Britz AT&T Labs

slide9

“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.”

Source; Interim Meeting Of The IARU Region 1 VHF/Uhf/Microwave Committee Vienna February 24 -25.2.2007

David Britz AT&T Labs

slide10

IARU and German Amateur

Radio Allocations overlaid

Spectral Data from ALMA

Atacama Large Millimeter Array

German Amateur radio

Allocations

444 – 453 GHz

510 – 546 GHz

711 – 730 GHz

909 – 926 GHz

945 – 951 GHz

Frequencies above 956 GHz

FCC Boundary

Unlicensed

Shared spectrum proposal between IARU,

Radio Astronomy and passive Earth

Exploration & Space Research Services

Source; Interim Meeting Of The IARU Region 1 VHF/Uhf/Microwave Committee Vienna February 24 -25.2.2007

David Britz AT&T Labs

slide11

Science Frequencies

ALMA

Atacama Large Millimeter Array

The colored bands are the tunable

receivers that will be used on ALMA:-

FCC Boundary

Unlicensed

Source; Interim Meeting Of The IARU Region 1 VHF/Uhf/Microwave Committee Vienna February 24 -25.2.2007

David Britz AT&T Labs

slide12

ITU/WRC/ IARU Terahertz 2000-2010 Focus

ITU – International Telecommunications Union

WRC – World Radiocommunications Conference 2000 -2010

IARU – International Amateur Radio Union Region 1: Europe, Africa, Middle East and Northern Asia

  • WRC-2000 extended the mandate of the ITU Radio Regulations from 275 - 400 GHz and then to 275 - 1000 GHzbut 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.

David Britz AT&T Labs

slide13

The recognition by the ITU of value and utility of the terahertz spectrum

is both innovative and proactive!

BUT

The give away to the IARU of this precious spectrum is unexpected, capricious

and irreconcilable with the evolution of future broadband wireless networks

How will loss of this currently

unlicensed spectrum effect near

future commercial development of

small-cell GigE+ wireless networks?

  • 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

David Britz AT&T Labs

slide14

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?

Source; Interim Meeting Of The IARU Region 1 VHF/Uhf/Microwave Committee Vienna February 24 -25.2.2007

David Britz AT&T Labs

slide15

Thank you

David Britz AT&T Labs