Patent ID: 8711797

Claim:
A base station (BS), comprising: a region information generator to determine additional assignment of a second region in a frequency band different from a first region in the frequency band, a component carrier (CC) of the first region having a bandwidth narrower than a maximum assignable bandwidth of the CC, and to generate information associated with the second region; a mapping controller to generate a reference signal to be used for channel estimation in the first region and the second region, and to control the reference signal to be assigned to a frequency band including the first region and the second region; a signal generator to generate the information associated with the second region and the reference signal assigned by the mapping controller to be a wireless signal; an a transmitter to transmit the generated wireless signal wherein the BS allocates resources to the first region and the second region so as to perform transmission and reception of data with a user equipment (UE), and wherein the mapping controller comprises a first sequence generator and a second sequence generator, the first sequence generator generates a first sequence based on a value calculated from a bandwidth of the CC of the first region and a cell identifier (ID) of the CC of the first region, the second sequence generator generates a second sequence based on a value calculated from a bandwidth of the second region and a value obtained by adding a predetermined offset to the cell ID of the CC of the first region, and the mapping controller controls the reference signal to be assigned to the CC of the first region, based on the first sequence, and controls the reference signal to be assigned to the second region based on the second sequence.