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2006

NeXt generation/dynamic spectrum access/cognitive radio wireless networks: A survey

9 years 10 months ago
NeXt generation/dynamic spectrum access/cognitive radio wireless networks: A survey
Today's wireless networks are characterized by a fixed spectrum assignment policy. However, a large portion of the assigned spectrum is used sporadically and geographical variations in the utilization of assigned spectrum ranges from 15% to 85% with a high variance in time. The limited available spectrum and the inefficiency in the spectrum usage necessitate a new communication paradigm to exploit the existing wireless spectrum opportunistically. This new networking paradigm is referred to as NeXt Generation (xG) Networks as well as Dynamic Spectrum Access (DSA) and cognitive radio networks. The term xG networks is used throughout the paper. The novel functionalities and current research challenges of the xG networks are explained in detail. More specifically, a brief overview of the cognitive radio technology is provided and the xG network architecture is introduced. Moreover, the xG network functions such as spectrum management, spectrum mobility and spectrum sharing are explai...
Ian F. Akyildiz, Won-Yeol Lee, Mehmet C. Vuran, Sh
Added 11 Dec 2010
Updated 11 Dec 2010
Type Journal
Year 2006
Where CN
Authors Ian F. Akyildiz, Won-Yeol Lee, Mehmet C. Vuran, Shantidev Mohanty
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