According to an example embodiment of the present invention there is provided an apparatus comprising at least one processing core, at least one memory including computer program code, the at least one memory and the computer program code being configured to, with the at least one processing core, cause the apparatus at least to cause a first parameter value set comprising at least one first parameter value to be provided to a first set of devices, obtain a fitness value associated with the first parameter value set in the first set of devices, determine, based at least in part on the fitness value and an optimization algorithm, at least one second parameter value set comprising at least one second parameter value, and cause the at least one second parameter value set to be provided to the first set or a second set of devices.