ISSN : 1796-2021
Volume : 1    Issue : 1    Date : April 2006

IEEE 802.22: An Introduction to the First Wireless Standard based on Cognitive Radios
Carlos Cordeiro, Kiran Challapali, Dagnachew Birru and Sai Shankar N
Page(s): 38-47
Full Text:
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In November/2004, we witnessed the formation of the first worldwide effort to define a novel
wireless air interface (i.e., MAC and PHY) standard based on Cognitive Radios (CRs): the IEEE
802.22 Working Group (WG). The IEEE 802.22 WG is chartered with the development of a
CR-based Wireless Regional Area Network (WRAN) Physical (PHY) and Medium Access Control
(MAC) layers for use by license-exempt devices in the spectrum that is currently allocated to the
Television (TV) service. Since 802.22 is required to reuse the fallow TV spectrum without causing
any harmful interference to incumbents (i.e., the TV receivers), cognitive radio techniques are of
primary importance in order to sense and measure the spectrum and detect the presence/absence
of incumbent signals. On top of that, other advanced techniques that facilitate coexistence such as
dynamic spectrum management and radio environment characterization could be designed. In this
paper, we provide a detailed overview of the 802.22 draft specification, its architecture,
requirements, applications, and coexistence considerations. These not only form the basis for the
definition of this groundbreaking wireless air interface standard, but will also serve as foundation for
future research in the promising area of CRs.

Index Terms
Cognitive radio, incumbent, sensing, spectrum agility, IEEE 802.22, coexistence