BASE STATION DEVICE, TERMINAL DEVICE, COMMUNICATION SYSTEM AND COMMUNICATION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a base station device or the like which can use a frequency spectrum effectively.SOLUTION: Base station devices 1-1 through 1-2 include, respectively, a wireless communication unit for performing wireless communication by using an existing carrier and an additional carrier, and a carrier information transmission control unit for transmitting information specifying a region of a frequency resource, where the additional carrier possibly exist in one or both of the low frequency side or high frequency side of the existing carrier, from the wireless communication unit to terminal devices (mobile station devices 21-1 through 21-n, 31-1 through 31-m) by wireless.