Sharing RF Spectrum with Commodity Wireless Technologies

Beschreibung

This book is about the theory and practice of spectrum sharing and is aimed at a wide audience. Although it addresses basic technical issues, the emphasis is on practice rather than theory. In presenting an overall picture of spectrum sharing, this book covers the why--the regulatory aspects as well as the how--the technical aspects. The latter is supported with a theoretical taxonomy of dimensions, modes and means of spectrum sharing and a number of practical cases of spectrum sharing are discussed, using established technologies as examples.

This book should prove accessible to wireless systems designers, RF engineers and protocol developers as well as to planners for large scale wireless LAN deployments. The combination of theoretical explanation and practice based analysis is expected to prove useful for radio spectrum managers and regulators as well as standards development organizations.

Further, this book should prove useful for educators and students in that it provides practice oriented background for the more abstract material presented in textbooks dealing with radio spectrum related theory.

Much energy has been spent on the subject of spectrum scarcity that would threaten to stunt the growth of wireless technologies and services. This concern comes on the heels of the great successes of both cellular communications and consumer oriented communications like Wi-Fi and Bluetooth that have changed the way people use computers and communications and that have led to the creation of large new markets for products and services.

The response of many spectrum regulators throughout the world in addressing these concerns has been to consider releasing more spectrum for unlicensed or for shared use. An example is the spectrum that is released by the transition to digital TV: the frequencies freed up are destined, in part, to new applications that would be license exempt. A possible beneficiary of new spectrum releases would be "the smart grid", a networked application of digital sensor and control technology to the energy delivery segment of the energy utility industry. This policy has heightened the interests of all involved in spectrum sharing and many proposals are being considered or brought forward. However, theory in this area is scarce and practice proves resistive of quick solutions. A case in point is RLAN/radar spectrum sharing in the 5GHz range: six years after the ITU-R allocated this shared spectrum, the rules for sharing as well as the means to verify compliance with these rules are not fully mature.

Another recent development is the interest in spectrum pricing and trading which tend to focus on the economic aspects of spectrum sharing at the expense understanding of the limitations as well as the technical possibilities of spectrum sharing.

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Jan Kruys

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