A method comprising signaling at least two resource partitions of at least one component carrier in a wireless communication system, wherein the at least one component carrier supports a legacy transmission scheme including primary resource blocks and an advanced transmission scheme including extension resource blocks, the method comprising: encoding a number of primary resource blocks of the at least one component carrier; encoding, according to a representation, a number of extension resource blocks of the at least one component carrier, wherein the representation comprises the number of extension resource blocks for a supported number of primary resource blocks and wherein said encoded number of extension resource blocks determines, for the encoded number of primary resource blocks, the available number of extension resource blocks; signaling (203, 204) said encoded numbers of primary and extension resource blocks of the at least one component carrier; and if the extension blocks are located asymmetrically around the primary resource blocks the method further encompasses: encoding additional information on the location of extension resource blocks of the at least one carrier; and signalling the encoded additional information on the location of extension resource blocks of the at least component carrier, wherein the encoding the number of extension resource blocks of the at least one component carrier either depends on the number of primary resource blocks of the at least one component carrier, or does not depend on the number of primary resource blocks of the at least one component carrier or comprises jointly encoding the number of extension resource blocks and the number of primary resource blocks of the at least one component carrier. encoding a number of primary resource blocks of the at least one component carrier; encoding, according to a representation, a number of extension resource blocks of the at least one component carrier, wherein the representation comprises the number of extension resource blocks for a supported number of primary resource blocks and wherein said encoded number of extension resource blocks determines, for the encoded number of primary resource blocks, the available number of extension resource blocks; signaling (203, 204) said encoded numbers of primary and extension resource blocks of the at least one component carrier; and if the extension blocks are located asymmetrically around the primary resource blocks the method further encompasses: encoding additional information on the location of extension resource blocks of the at least one carrier; and signalling the encoded additional information on the location of extension resource blocks of the at least component carrier, wherein the encoding the number of extension resource blocks of the at least one component carrier either depends on the number of primary resource blocks of the at least one component carrier, or does not depend on the number of primary resource blocks of the at least one component carrier or comprises jointly encoding the number of extension resource blocks and the number of primary resource blocks of the at least one component carrier. encoding additional information on the location of extension resource blocks of the at least one carrier; and signalling the encoded additional information on the location of extension resource blocks of the at least component carrier, wherein the encoding the number of extension resource blocks of the at least one component carrier either depends on the number of primary resource blocks of the at least one component carrier, or does not depend on the number of primary resource blocks of the at least one component carrier or comprises jointly encoding the number of extension resource blocks and the number of primary resource blocks of the at least one component carrier.