An apparatus, method and computer program product comprise controlling cellular network based communication in a primary cell on a frequency band related to the cellular network and by using an uplink and downlink configuration specific to the primary cell; controlling communication in a secondary cell on a frequency band related to a television white space channel and by using an uplink and downlink configuration specific to the secondary cell; measuring radio interference on a temporarily set uplink related carrier on the secondary cell based on information on the temporarily set uplink related carrier received on a downlink related carrier on the primary cell; and reporting results of radio interference measurement via the primary cell.