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Spectrum handoff (HO) is one of the main issues in cognitive radio networks. Spectrum handoff occurs when the owner of the spectrum or the primary user (PU) reclaims a channel already used opportunistically by a secondary user (SU). In this case, the SU has to vacate this channel and select another free one. This process has a negative impact on the performance of SU transmission in terms of delay...
This paper investigates the issue of determining an appropriate utility function to model the Secondary User (SU) preference toward spectrum holes on the basis of their duration. A Sigmoid shaped utility function is proposed and a proper tuning is discussed to improve the representation of SU preference and to involve the radio quality on the access decision process. The performance and the suitability...
The specificity of overlay spectrum sharing in cognitive radio network, is that the secondary user has to handoff and vacate immediately the channel once the Primary User appears and reclaims it. Such handoff becomes more frequent specially in case of multichannel access since that in a wider band, a PU is likely to reclaim a part of the band more quickly, and the SU has to switch to a different set...
In this paper, we investigate a channel selection algorithm based on temporal characterization of spectrum holes. This algorithm is conceived to be implemented within a decentralized Radio Resources Management operation where decision making processes are executed at the mobile terminal side. Different scenarios are considered to test the effectiveness of this algorithm in improving the spectrum efficiency.
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