Radio communication systems, devices and methods for enabling variable subband configuration of one or more search spaces. In a first time interval, a UE attempts to decode one or more control channels on downlink or sidelink resources of a first subband configuration. In a second time interval, the UE attempts to decode one or more control channels on downlink or sidelink resources of a second subband configuration. The first subband configuration spans a first frequency range and the second subband configuration spans a second frequency range different from the first frequency range.