Adding a sensing command to scheduling information in a carrier aggregation system

The present invention proposes methods, apparatus and computer readable memories in relation to a communication module configured for communication in a carrier aggregation mode aggregating a primary and at least one secondary carrier. Scheduling information is carried in a control channel of one of the carriers, the scheduling information being associated with a respective one of said aggregated carriers and designating search spaces for payload in a payload channel of said respective aggregated carrier. Sensing is performed responsive to a sensing command added to the scheduling information associated with said at least one secondary carrier, which sensing command commands sensing to be performed on said at least one secondary carrier.