Patent ID: 8774290

Claim:
A base station apparatus configuring a first cell and communicating with a terminal apparatus, the base station apparatus comprising: a notifying unit configured to notify the terminal apparatus of first information and second information, the first information specifying a first subframe including a first resource element in which a first reference signal of the first cell is placed, the first resource element being used to transmit a first signal of a second cell other than the first cell, the second information specifying a second subframe including a second resource element in which a second reference signal of the first cell is placed, and the second resource element not being used to transmit a signal of the second cell other than the first cell; and a transmitting unit configured to transmit the first and second reference signals by the first and second subframes respectively, wherein the first cell is different from the second cell, the first information is different from the second information, and the first subframe is different from the second subframe.