Efficient handoff spectrum scheme using fuzzy decision making in cognitive radio system

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 spectrum handoff based on the fuzzy logic system. The proposed system consists of one Fuzzy Logic Controllers (FLC) with three input linguistic variables, namely, received power, eNB load and arrival rate of PUs and one linguistic variable (handoff probability). The proposed system provides a good platform to avoid unwanted handoff in CRNs in LTE-A system.