Layer alignment method and apparatus for multilayer three-dimensional beamforming in wireless communication system
A method for transmitting feedback information for fractional beamforming using a massive antenna array from a User Equipment (UE) to a Base Station (BS) in a wireless communication system is disclosed. The method includes receiving information about a plurality of Reference Signal (RS) resources from the BS; selecting at least one of a sub-precoder for at least one RS resources, and one linking precoder for linking the RS resources, based on a preset codebook; and reporting information about the selected precoder to the BS. The selected precoder is one precoding matrix of precoding matrices included in the codebook or a permuted form of the one precoding matrix, and the information about the selected precoder includes an index and permutation information of the one precoding matrix.
1. A method for transmitting feedback information for fractional beamforming using a massive antenna array from a User Equipment (UE) to a Base Station (BS) in a wireless communication system, the method comprising:
receiving information about a plurality of Reference Signal (RS) resources from the BS;
selecting a sub-precoder for one RS resource among the plurality of RS resources and a linking precoder for linking the plurality of RS resources, based on a preset codebook; and
reporting information about the selected sub-precoder and the selected linking precoder to the BS,
wherein the selected sub-precoder is one precoding matrix of precoding matrices comprised in the codebook or a permuted form of the one precoding matrix, and
wherein the information about the selected sub-precoder comprises an index and permutation information of the one precoding matrix.
2. The method of claim 1 , wherein, if the RS resources respectively correspond to columns of the massive antenna array, the sub-precoder is used for vertical beamforming and the linking precoder is used for horizontal beamforming.
3. The method of claim 1 , wherein, if the RS resources respectively correspond to rows of the massive antenna array, the sub-precoder is used for horizontal beamforming and the linking precoder is used for vertical beamforming.
4. The method of claim 1 , wherein the permutation information is permutation matrix information for defining a precoding matrix permuted from the one precoding matrix.
5. The method of claim 1 , wherein the information about the selected sub-precoder comprises matching information between the sub-precoder and the linking precoder.
6. The method of claim 1 , wherein the massive antenna array is partitioned in units of rows or columns, and
wherein the RS resources correspond to the partitions.
7. A reception apparatus in a wireless communication system, the reception apparatus comprising:
a transceiver configured to receive information about a plurality of Reference Signal (RS) resources from a transmission apparatus for fractional beamforming using a massive antenna array, and reporting information about a selected sub-precoder and a selected linking precoder to the transmission apparatus using the RS resources; and
a processor configured to select a sub-precoder for one RS resource among the plurality of RS resources, and a linking precoder for linking the plurality of RS resources, based on a preset codebook,
wherein the selected sub-precoder is one precoding matrix of precoding matrices comprised in the codebook or a permuted form of the one precoding matrix, and
wherein the information about the selected sub-precoder comprises an index and permutation information of the one precoding matrix.
8. The reception apparatus of claim 7 , wherein, if the RS resources respectively correspond to columns of the massive antenna array, the sub-precoder is used for vertical beamforming and the linking precoder is used for horizontal beamforming.
9. The reception apparatus of claim 7 , wherein, if the RS resources respectively correspond to rows of the massive antenna array, the sub-precoder is used for horizontal beamforming and the linking precoder is used for vertical beamforming.
10. The reception apparatus of claim 7 , wherein the permutation information is permutation matrix information for defining a precoding matrix permuted from the one precoding matrix.
11. The reception apparatus of claim 7 , wherein the information about the selected sub-precoder comprises matching information between the sub-precoder and the linking precoder.
12. The reception apparatus of claim 7 , wherein the massive antenna array is partitioned in units of rows or columns, and
wherein the RS resources correspond to the partitions.