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In cognitive radio networks, the identification of a primary user (PU) with the help of spectrum sensing is very important for a secondary user (SU), such that interference free transmission can be performed. In recent times, the cooperative spectrum sensing that improves the reliability of the decisions made about the presence of a PU and overcoming hidden terminal problem by obtaining sensing results from different sensors is gaining much attention. However, the selfish SUs are sometimes not willing to cooperate. This paper proposes a contract theory-based approach, which is an incentive design mechanism where the participants are offered appropriately designed reward to encourage cooperation. The secondary base-station (BS)-SU interaction is modeled as a labor market using contract theory. Contract theory helps in analyzing the case of incomplete information where the BS is not aware of the SU's private …