A method for processing a signal by a user equipment, UE, in a wireless communication system, the method comprising: calculating a recommended transmit, Tx, beamforming vector V a1 of a serving cell and a pre-receive filtering vector U a 1 H, on the basis of a channel H a related to the serving cell; calculating an effective channel H̃ b related to a contiguous cell by applying the pre-receive filtering vector U a 1 H to a signal received from the contiguous cell; calculating a restricted beamforming vector Ṽ b0 of the contiguous cell on the basis of the effective channel H̃ b; transmitting information of the Tx beamforming vector V a1 and the restricted beamforming vector Ṽ b0 to the serving cell; receiving a response signal indicating whether the Tx beamforming vector V a1 is used by the serving cell and whether not to use the restricted beamforming vector Ṽ b0 by the contiguous cell is approved, from the serving cell; when the response signal indicates that the Tx beamforming vector V a1 is used by the serving cell and that not to use the restricted beamforming vector Ṽ b0 is approved: receiving from the serving cell, a demodulation reference signal for a data signal by applying the pre-receive filtering vector U a 1 H, performing channel estimation based on the demodulation reference signal received by applying the pre-receive filtering vector U a 1 H, and receiving and decoding the data signal based on a result of the channel estimation with applying the pre-receive filtering vector U a 1 H; and when the response signal does not indicate that the Tx beamforming vector V a1 is used by the serving cell and that not to use the restricted beamforming vector Ṽ b0 is approved: receiving from the serving cell, a demodulation reference signal for a data signal without applying the pre-receive filtering vector U a 1 H, performing channel estimation based on the demodulation reference signal received without applying the pre-receive filtering vector U a 1 H, and receiving and decoding the data signal based on a result of the channel estimation without applying the pre-receive filtering vector U a 1 H. calculating a recommended transmit, Tx, beamforming vector V a1 of a serving cell and a pre-receive filtering vector U a 1 H, on the basis of a channel H a related to the serving cell; calculating an effective channel H̃ b related to a contiguous cell by applying the pre-receive filtering vector U a 1 H to a signal received from the contiguous cell; calculating a restricted beamforming vector Ṽ b0 of the contiguous cell on the basis of the effective channel H̃ b; transmitting information of the Tx beamforming vector V a1 and the restricted beamforming vector Ṽ b0 to the serving cell; receiving a response signal indicating whether the Tx beamforming vector V a1 is used by the serving cell and whether not to use the restricted beamforming vector Ṽ b0 by the contiguous cell is approved, from the serving cell; when the response signal indicates that the Tx beamforming vector V a1 is used by the serving cell and that not to use the restricted beamforming vector Ṽ b0 is approved: receiving from the serving cell, a demodulation reference signal for a data signal by applying the pre-receive filtering vector U a 1 H, performing channel estimation based on the demodulation reference signal received by applying the pre-receive filtering vector U a 1 H, and receiving and decoding the data signal based on a result of the channel estimation with applying the pre-receive filtering vector U a 1 H; and when the response signal does not indicate that the Tx beamforming vector V a1 is used by the serving cell and that not to use the restricted beamforming vector Ṽ b0 is approved: receiving from the serving cell, a demodulation reference signal for a data signal without applying the pre-receive filtering vector U a 1 H, performing channel estimation based on the demodulation reference signal received without applying the pre-receive filtering vector U a 1 H, and receiving and decoding the data signal based on a result of the channel estimation without applying the pre-receive filtering vector U a 1 H. receiving from the serving cell, a demodulation reference signal for a data signal by applying the pre-receive filtering vector U a 1 H, performing channel estimation based on the demodulation reference signal received by applying the pre-receive filtering vector U a 1 H, and receiving and decoding the data signal based on a result of the channel estimation with applying the pre-receive filtering vector U a 1 H; and when the response signal does not indicate that the Tx beamforming vector V a1 is used by the serving cell and that not to use the restricted beamforming vector Ṽ b0 is approved: receiving from the serving cell, a demodulation reference signal for a data signal without applying the pre-receive filtering vector U a 1 H, performing channel estimation based on the demodulation reference signal received without applying the pre-receive filtering vector U a 1 H, and receiving and decoding the data signal based on a result of the channel estimation without applying the pre-receive filtering vector U a 1 H. receiving from the serving cell, a demodulation reference signal for a data signal without applying the pre-receive filtering vector U a 1 H, performing channel estimation based on the demodulation reference signal received without applying the pre-receive filtering vector U a 1 H, and receiving and decoding the data signal based on a result of the channel estimation without applying the pre-receive filtering vector U a 1 H.