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

摘要

A method and apparatus for performing effective feedback in a wireless communication system supporting multiple antennas. A method for transmitting CSI of downlink transmission via uplink in a wireless communication system includes transmitting a joint-coded rank indicator (RI) and a first wideband (WB) precoding matrix indicator (PMI) at a first subframe, and transmitting a wideband channel quality indicator (WB CQI) and a second WB PMI at a second subframe. A user equipment (UE) preferred precoding matrix is indicated by a combination of the first PMI and the second PMI. If the RI is Rank-1 or Rank-2, the first PMI indicates one of subsets each having 8 indexes from among 16 indexes of the first PMI of a precoding codebook.

主权项

1. A method for transmitting channel status information (CSI) via uplink in a wireless communication system, the method performed by a user equipment (UE) comprising:
transmitting, in a first subframe, a rank indicator (RI); and transmitting, in a second subframe, a wideband channel quality indicator (WB CQI), a first wideband precoding matrix indicator (WB PMI), and a second WB PMI, wherein, the first WB PMI and the second WB PMI are transmitted by using 4 bits when the RI indicates rank-1, rank-2, rank-3 or rank-4, and wherein, the first WB PMI and the second WB PMI are transmitted by using 2 bits when the RI indicates rank-5, rank-6 or rank-7.