Abstract
Cognitive Radio Network (CRN) is a new technique that utilizes available unlicensed spectrum bands due to limited numbers of fixed licensed spectrum bands. It consists of four main functions, namely, spectrum sensing, spectrum decision, spectrum sharing and spectrum mobility. We focus on the spectrum mobility (also known as spectrum handoff) which manages the movements of secondary users to occupy the vacant unlicensed spectrum without interrupting the transmission of primary users. In this paper, we introduce fuzzy logic based negotiation approach based for spectrum handoff in CRN. It contains two Fuzzy Logic Controllers (FLCs), namely, price negotiation and duration negotiation. The proposed system provides a good solution to avoid the communication interruption caused by the mobility of SU. It will reduce the handoff delay by 46 ∼ 62% if the SU correctly selects the best PU.
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