1. A method relating to cooperative spectrum sensing, the method comprising: Obtaining, by a sensor selector, a candidate set of sensors that are available to participate in the cooperative spectrum sensing, wherein spectrum sensing is the act of determining, by monitoring radio transmissions, whether a particular spectrum band is currently at least in part free for use, wherein the sensor selector comprises a processor and a memory unit and the step of obtaining the candidate set is performed by the processor; defining a cost formula for calculating a cost associated with using sensors from the candidate set in the cooperative spectrum sensing; and partitioning, by the processor, the candidate set into an active set containing one or more sensors of the candidate set to participate in the cooperative spectrum sensing and a passive set containing one or more sensors of the candidate set not to participate in the cooperative spectrum sensing by applying an optimization procedure which performs a constrained optimization of the cost in accordance with the defined cost formula.