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Sharing of spectrum has been identified as a key requirement in Cognitive Radio Networks (CRNs). The authors address the problem of spectrum sharing with spectrum pricing where the primary user wants to sell the spectrum to the secondary users. By equilibrium pricing scheme, each of the players in the spectrum sharing game aims to take the strategy which maximize its own profit under sojourn-time constraint for secondary users. In condition of spectrum sojourn-time is limited because of primary user's channel usage pattern each of spectrum providers will choose different strategy to increase profit more.
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