METHOD FOR FEEDING BACK CSI INFORMATION IN WIRELESS COMMUNICATION SYSTEM, AND APPARATUS THEREFOR
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United States of America Patent
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Jul 23, 2015
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Feb 26, 2015
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The present application provides a method for feeding back, by a terminal, CSI information in a wireless communication system to which 3D beamforming is applied. Here, the method comprises the steps of: receiving a pilot signal from a base station; and feeding back first CSI information for a horizontal direction domain and second CSI information for a vertical direction domain on the basis of the 3D beamforming. Here, when a precoding indicator is a first value, first wideband (WB) CSI information and second wideband (WB) CSI information may be fed back, and when the precoding indicator is a second value, first subband (SB) CSI information and second subband (SB) CSI information may be fed back.
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