METHOD AND APPARATUS FOR EFFICIENT FEEDBACK IN A WIRELESS COMMUNICATION SYSTEM THAT SUPPORTS MULTIPLE ANTENNAS

WIPO Patent Application WO/2012/039588

A2

The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for efficient feedback in a wireless communication system that supports multiple antennas. According to one embodiment of the present invention, a method for transmitting channel state information for downlink transmission via an uplink in a wireless communication system comprises the following steps: transmitting a rank indicator (RI) and a precoder-type indicator (PTI) in a first subframe; transmitting, in a second subframe, a first precoding matrix indicator (PMI) if the PTI has a first value, and a second PMI and a wideband CQI if the PTI has a second value; and transmitting, in a third subframe, the second PMI and the wideband CQI if the PTI has said first value, and a sub-band CQI and the second PMI if the PTI has said second value. The precoding matrix to be applied to the downlink transmission is determined by a combination of the first PMI and the second PMI, and sub-sampled codebooks of precoding codebooks for each of ranks 2, 3 and 4 may be applied to the second PMI.

KOO HYUNSOO (KR)
KIM SUNAM (KR)
LIM DONGGUK (KR)
LEE MOONIL (KR)
CHUNG JAEHOON (KR)

PCT/KR2011/007018

March 29, 2012

September 23, 2011

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LG ELECTRONICS INC (KR)
KOO HYUNSOO (KR)
KIM SUNAM (KR)
LIM DONGGUK (KR)
LEE MOONIL (KR)
CHUNG JAEHOON (KR)

H04B7/04; H04L1/06; H04L27/26

US20090190528A1	2009-07-30
US20090257423A1	2009-10-15

None
See also references of EP 2621102A4

KIM, Yong In et al. (7th Floor Hyundae Building 175-9,Jamsil-dong, Songpa-ku, Seoul 138-861, KR)

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