Resource Allocation with MAC Layer Node Cooperation in Cognitive Radio Networks

An algorithm for cooperative Dynamic Spectrum Access in Cognitive Radio networks is presented. The proposed algorithm utilizes Medium Access Control layer mechanisms for message exchange between secondary nodes that operate in license exempt spectrum bands, in order to achieve interference mitigatio...

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Bibliographic Details
Published in:International journal of digital multimedia broadcasting 2010-01, Vol.2010 (2010), p.1-11
Main Authors: Merentitis, Andreas, Triantafyllopoulou, Dionysia
Format: Article
Language:English
Subjects:
Access control
Algorithms
Delay
Interference
Licenses
Messages
Networks
Prices
Radio
Spectrum allocation
Studies
Uncertainty
Wireless networks
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Summary:An algorithm for cooperative Dynamic Spectrum Access in Cognitive Radio networks is presented. The proposed algorithm utilizes Medium Access Control layer mechanisms for message exchange between secondary nodes that operate in license exempt spectrum bands, in order to achieve interference mitigation. A fuzzy logic reasoner is utilized in order to take into account the effect of the coexistence of a large number of users in the interference as well as to cope for uncertainties in the message exchange, caused by the nodes' mobility and the large delays in the updating of the necessary information. The proposed algorithm is applied in Filter Bank Multicarrier, as well as Orthogonal Frequency Division Multiplexing systems, and its performance is evaluated through extensive simulations that cover a wide range of typical scenarios. Experimental results indicate improved behaviour compared to previous schemes, especially in the case of uncertainties that cause underestimation of the interference levels.
ISSN:1687-7578
1687-7586
DOI:10.1155/2010/458636