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 comprising:
transmitting a rank indicator (RI) at a first subframe; and transmitting a wideband channel quality indicator (WB CQI), a first wideband precoding matrix indicator (WB PMI) and a second WB PMI at a second subframe, wherein: if the RI is Rank-1 or Rank-2, a number of elements for the first WB PMI is 8, and if the RI is Rank-3 or Rank-4, a number of elements for the second WB PMI is 8.