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Issue No. 02 - February (2011 vol. 10)
ISSN: 1536-1233
pp: 161-174
Won-Yeol Lee , Georgia Institute of Technology, Atlanta
Ian F. Akyildiz , Georgia Institute of Technology, Atlanta
Cognitive radio networks have been proposed as a solution to both spectrum inefficiency and spectrum scarcity problems. However, they face to a unique challenge based on the fluctuating nature of heterogeneous spectrum bands as well as the diverse service requirements of various applications. In this paper, a spectrum decision framework is proposed to determine a set of spectrum bands by considering the application requirements as well as the dynamic nature of spectrum bands. To this end, first, each spectrum is characterized by jointly considering primary user activity and spectrum sensing operations. Based on this, a minimum variance-based spectrum decision is proposed for real-time applications, which minimizes the capacity variance of the decided spectrum bands subject to the capacity constraints. For best-effort applications, a maximum capacity-based spectrum decision is proposed where spectrum bands are decided to maximize the total network capacity. Moreover, a dynamic resource management scheme is developed to coordinate the spectrum decision adaptively dependent on the time-varying cognitive radio network capacity. Simulation results show that the proposed methods provide efficient bandwidth utilization while satisfying service requirements.
Cognitive radio networks, spectrum decision, spectrum characterization, real-time application, best-effort application, minimum variance-based spectrum decision, maximum capacity-based spectrum decision, resource management.

W. Lee and I. F. Akyildiz, "A Spectrum Decision Framework for Cognitive Radio Networks," in IEEE Transactions on Mobile Computing, vol. 10, no. , pp. 161-174, 2010.
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