Patent ID: 8472539

Claim:
A method of transmitting power information in a wireless communication system, the method comprising: determining energy per resource element (RE) to which a reference signal or data is mapped for downlink transmission; and transmitting power information of the reference signal and the data, wherein the reference signal comprises a channel state indication-reference signal (CSI-RS) for channel state measurement, power information of the CSI-RS is denoted by P Data-NRS /P CSI-RS or P CSI-RS /P CRS , and the power information of the data included in an orthogonal frequency division multiplexing (OFDM) symbol including the CSI-RS is denoted by P DATA-NRS /P CRS , wherein P DATA-NRS is a power for a data resource element (data RE) for an OFDM symbol on which only data is transmitted, P CSI-RS is a power for a CSI-RS resource element (CSI-RS RE), and P CRS is a power for a cell-specific reference signal resource element (CRS RE) used for channel state measurement and data demodulation.