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In this paper, the authors consider the cooperative spectrum sensing problem in a Cognitive Radio (CR) mesh network, where Secondary Users (SUs) are self-organized into a IEEE 802.16 mesh network sharing the spectrum band allocated to a Primary Users' (PUs) network. They propose two new cooperative spectrum sensing strategies, called Amplify-and-Relay (AR) and Detect-and-Relay (DR), aiming at improving the SU's detection performance with the help of other eligible SUs so as to agilely vacate the channel to the primary network when PUs stay in the active states. AR and DR strategies are implemented by two cooperative detection protocols named as AR Protocol (ARP) and DR Protocol (DRP), respectively, which are arranged to periodically execute in the spectrum sensing phase of a MAC frame.
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