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

  • US 20120076236A1
  • Filed: 09/23/2011
  • Published: 03/29/2012
  • Est. Priority Date: 09/26/2010
  • Status: Active Grant
First Claim
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1. A method for transmitting channel status information (CSI) of downlink transmission via uplink in a wireless communication system, the method comprising:

  • transmitting a rank indicator (RI) at a first subframe; and

    transmitting a first precoding matrix indicator (PMI), a second PMI, and a wideband (WB) channel quality indicator (CQI) at a second subframe,wherein a user equipment (UE) preferred precoding matrix is indicated by a combination of the first PMI and the second PMI, anda subsampled codebook for each precoding codebook of ranks from Rank-1 to Rank-4 is applied to the first PMI and the second PMI, and a sum of the first PMI and the second PMI for each of Rank-1 to Rank-4 is comprised of 4 bits.

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