US 10,368,354 B2
Channel state information feedback method in multi-antenna wireless communication system and apparatus therefor
Youngtae Kim, Seoul (KR); Kijun Kim, Seoul (KR); Jonghyun Park, Seoul (KR); Bonghoe Kim, Seoul (KR); and Hyungtae Kim, Seoul (KR)
Assigned to LG Electronics Inc., Seoul (KR)
Appl. No. 15/560,776
Filed by LG ELECTRONICS INC., Seoul (KR)
PCT Filed Mar. 24, 2016, PCT No. PCT/KR2016/002984
§ 371(c)(1), (2) Date Sep. 22, 2017,
PCT Pub. No. WO2016/153287, PCT Pub. Date Sep. 29, 2016.
Claims priority of provisional application 62/137,834, filed on Mar. 25, 2015.
Prior Publication US 2018/0063826 A1, Mar. 1, 2018
Int. Cl. H04W 72/04 (2009.01); H04B 7/0413 (2017.01); H04B 7/06 (2006.01)
CPC H04W 72/046 (2013.01) [H04B 7/0413 (2013.01); H04B 7/0626 (2013.01); H04B 7/0695 (2013.01); H04B 7/0671 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method for feeding back channel state information (CSI) by a user equipment (UE) in a wireless communication system supporting a 3-dimensional multiple-input multiple-output (3D-MIMO) antenna, the method comprising:
receiving, through radio resource control (RRC) signaling, information about N beams (where N is a natural number) precoded for specific antennas among multiple antennas constituting the 3D-MIMO antenna and information about a number M of interference beams (where M is a natural number, M≤N−1);
selecting a specific beam for generating the CSI from among the N beams;
determining M beams among the remaining beams in descending order of the difference from the index of the specific beam; and
generating the CSI for the specific beam using the interference determined based on the M beams.