Cognitive Radio Communications and Networks: Principles and Practice By A. M. Wyglinski, M. Nekovee, Y. T. Hou (Elsevier, December 2009) 1 Chapter 13 Defining

“Cognitive Radio Communications and Networks: Principles and Practice”By A. M. Wyglinski, M. Nekovee, Y. T. Hou (Elsevier, December 2009)

1

Chapter 13

Defining Cognitive Radio


2

Outline

Historical perspective on the development of cognitive radio concept

Comparison of different views on cognitive radio

Definitions of concepts related to cognitive radio

Detailed overview of standardization activities on cognitive radio with an emphasis on IEEE SCC41


3

Popularity of cognitive radio

Can you find out what are these numbers now?


History Maritime communication developed in early

1920s. FCC allowed (1960) shared channels in land

mobile communication with LBT. CB: FCC allowed (1970s) shared channels

at 27MHz band. FCC Rule Part 15 (1985 approved),

described the ways of coexistence of low power wireless devices in Industrial, Scientific and Medical (ISM) band.


5

Depicting the history of cognitive radio


Future ?

Intelligent systems. Higher computational capability. More flexibility. Harvesting more and more radio

spectrum (reusing them temporally and spatially).

Digital dividend. More standards to come.


Definitions(1)

Mitola: “wireless personal digital assistants and the related networks were sufficiently computationally intelligent about radio resources, … to detect user needs as a function of use context, and to provide radio resources and wireless services most appropriate to those needs"

How a SDR can become a CR with this definition?


Definitions(2) Haykin: “inclusive of SDR, [idea] to promote

efficient use of spectrum by exploiting the existence of spectrum holes“ OR

“intelligent wireless communication system (...) that adapt(s) to statistical variations in the input stimuli … which are highly reliable communication (...); efficient utilization of radio spectrum."

An efficient (re)use of spectrum is in itself CR ?


Comparison of various terms related to CR

Aspects Mitola Haykin SDR Forum

FCC

Inf. Theory

User's needs x

Context x

Intelligence Control

x x x

Radio/Spectrum x x x x x

Spectrum Efficiency

x x x x

Primary Users x x x x

SDR x x

Cooperation x

Reliability x

Is this table complete? Are there more terms?


10

Cognitive radio: IEEE SCC41


11

Classification of definitions


Adaptable Radio devices and their characteristics

Type of Radio Platform Reconfiguration Intelligence

Hardware HW Minimal None

Software HW/SW Automatic Minimal

Adaptive HW/SW Automatic/Predefined Minimal/None

Reconfigurable

HW/SW Manual/Predefined Minimal/None

Policy-based HW/SW Manual (database)/ Minimal/None

Automatic

Cognitive HW/SW Full Artificial/ Machine

Learning

Intelligent HW/SW Full Machine Learning/

Predicting Decision


Relationship between various standards


Open issues

Regulatory Test Procedures Protocols Interoperability Coexistence and cooperation Medium Access Control Security


15

Chapter 13 Summary

Cognitive radio is a notion with multiple, very often contradictory definitions

Many independent standardization bodies are working on cognitive radio (IEEE, ITU, ETSI, …)

Documents

Cognitive Radio Communications and Networks: Principles and Practice By A. M. Wyglinski, M. Nekovee, Y. T. Hou (Elsevier, December 2009) 1 Chapter 13 Defining