US 9,813,132 B2
Method and apparatus for transmitting channel state information in wireless communication system
Hyungtae Kim, Seoul (KR); Kijun Kim, Seoul (KR); and Hyunho Lee, Seoul (KR)
Assigned to LG Electronics Inc., Seoul (KR)
Appl. No. 14/767,764
Filed by LG Electronics Inc., Seoul (KR)
PCT Filed Apr. 29, 2014, PCT No. PCT/KR2014/003796
§ 371(c)(1), (2) Date Aug. 13, 2015,
PCT Pub. No. WO2014/178616, PCT Pub. Date Nov. 6, 2014.
Claims priority of provisional application 61/817,270, filed on Apr. 29, 2013.
Claims priority of provisional application 61/821,192, filed on May 8, 2013.
Prior Publication US 2015/0381253 A1, Dec. 31, 2015
Int. Cl. H04B 7/06 (2006.01); H04W 72/04 (2009.01); H04L 1/00 (2006.01); H04B 7/04 (2017.01); H04L 5/00 (2006.01); H04L 25/03 (2006.01)
CPC H04B 7/0626 (2013.01) [H04B 7/0478 (2013.01); H04B 7/0482 (2013.01); H04B 7/0486 (2013.01); H04B 7/063 (2013.01); H04B 7/0632 (2013.01); H04B 7/0639 (2013.01); H04L 1/0026 (2013.01); H04L 1/0027 (2013.01); H04L 5/0057 (2013.01); H04L 25/03898 (2013.01); H04W 72/0413 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method for transmitting a channel state information (CSI) by a user equipment (UE) in a wireless communication system, the method comprising:
determining a Precoding Matrix Indicator (PMI) using a codebook for 4 antenna ports in consideration of a rank indicator (RI); and
reporting the CSI to a base station (BS), wherein the CSI includes the PMI, the RI and a precoding type indicator (PTI),
wherein when the RI is 3 or 4 , the PTI is set to 1 and the PMI is determined by using only 4 precoding matrices out of 16 precoding matrices in the codebook, where the 4 precoding matrices are as follows:

OG Complex Work Unit Drawing