Patent ID: 8654666

Claim:
A communication method in a multi-carrier system, the method comprising: determining a size of a special resource block (SRB), wherein the SRB is a resource allocation unit of a middle guard band; allocating the SRB to the middle guard band; and transmitting the signals through the SRB, wherein the middle guard band is a frequency band positioned between used bands of a plurality of carriers, respectively, within an aggregated carrier formed by aggregating the plurality of carriers; and wherein the size of the SRB is determined based on whether the bandwidths of the plurality of carriers are the same as each other, wherein the size of the SRB is 19 subcarriers in the frequency domain when the bandwidths of the plurality of carriers are the same as each other, and the size of the SRB is 9 subcarriers in the frequency domain when the bandwidths of the plurality of carriers are different from each other.