the present invention relates to a method or communicating between a primary station and a plurality of secondary stations , comprising the primary station providing a plurality of resource sets , the primary station configuring a secondary station to search for a control channel on at least one of a plurality of search spaces each corresponding to a resource set , wherein at least part of one of the search spaces is used to transmit a control message to a secondary station , the control message being indicative of a resource allocated to the secondary station for transmitting to the primary station or receiving from the primary station data , and wherein the secondary station deduces from the part of the search space used for transmitting the control message an indication of the resource set from the plurality of resource sets within which the allocated resource is located .