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Spectrum Policy and Technology. Spectrum Access and the Promise of Cognitive Radio Technology. Spectrum Policy and Cognitive Radios. Spectrum Policy Task Force recognized the changes in technology and the profound impact that would have to spectrum policy

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spectrum policy and technology

Spectrum Policy and Technology

Spectrum Access and the Promise of Cognitive Radio Technology

spectrum policy and cognitive radios
Spectrum Policy and Cognitive Radios
  • Spectrum Policy Task Force recognized the changes in technology and the profound impact that would have to spectrum policy
    • Improved Spectrum Access can mitigate scarcity of the spectrum resource
    • Clearly defined interference metrics can improve utilization of the spectrum
    • Spectrum can be parceled in frequency, space, and time

Cognitive radio technology, inclusive of software and software definable radio technology, are key components for realizing this vision

Goal is to Promote Efficient Use of the Spectrum!

cognitive and software and software definable radio technology
Cognitive and Software and Software-Definable Radio Technology
  • Software and Software Definable Radio Capabilities
    • Flexible … “capable of responding or conforming to changing or new situations”
    • Agile … “marked by ready ability to move with quick easy grace”
  • Cognitive Radio Capabilities
    • Cognitive … “knowing, or apprehending by the understanding”

Webster’s New Collegiate Dictionary

improving spectrum efficiency
Improving Spectrum Efficiency


Access Limited

Throughput Limited

Discourageinefficient use

Improve accessthrough time, frequency,power, bandwidthand space


like systems

Adjust regulationsas technology develops

Permit otherusers or uses --


spectrum use in practice
Some spectrum is intensively used

Other spectrum has highly variable use in when viewed in terms of time and geography

Spectrum Use in Practice
spectrum policy reform access is key
Spectrum Policy Reform: Access is Key
  • Increased access can mitigate scarcity of spectrum resource
    • Most “prime spectrum” has already been assigned to one or more parties, and it is becoming increasingly difficult to find spectrum that can be made available either for new services or to expand existing ones.
    • Improving access to the spectrum can be achieved through permitting licensees greater flexibility and other means.
promoting access to spectrum the new model





Not-to-Interfere Basis

Easement User

Promoting Access to Spectrum The New Model

Below the Acceptable

“Interference Temperature”

Cognitive Radios

Duty Cycle




Promoting Access to SpectrumThrough Increased FlexibilityIllustration: Public Safety & Dynamic Spectrum Use


Data Services

Public Safety






Data Services


Public Safety

Use of public safety spectrum is highly variable

interference avoidance tolerance of interference
Quantify acceptable levels of interference

Can Cognitive Radios capture the Interference Temperature?

How should Cognitive Radios exploit this information ?

Interference AvoidanceTolerance of Interference

Prevent Aggregation Above Interference Temperature Limit

New Opportunities for Spectrum Access

Licensed signal

Power at Receiver

Noise Floor

Current FCC Power Limits

Distance from licensed transmitting antenna

promoting access to spectrum discouraging inefficient use
Promoting Access to SpectrumDiscouraging Inefficient Use
  • Situations where the Commission finds it necessary to promote spectrum or technical efficiency
    • Consider user fees or other steps to stimulate improvements in efficiency when marketplace is inadequate.
    • To the extent that wireline or hybrid technologies may be more efficient alternatives to existing use of radio spectrum in some instances, promote the use of such alternatives whenever appropriate.
key questions
Key Questions
  • Since Cognitive Radios span a large range of capabilities …
    • What subset of capabilities are needed?
    • What subset of capabilities are in hand? Near term? Far term?
  • Economics, Reliability, and Capability impact the viability of a technology
    • What are the impediments for a cost-effective system?
    • How do we determine the reliability constraints for different applications of Cognitive Radio technology (e.g. public safety, DoD, consumer handsets)

These Key Questions will hopefully be addressed during this workshop