Patent ID: 9014045
Filing Date: 2015-04-21
Classification: H04B,H04L,H04W

Abstract:
1. A method for transmitting channel status information (CSI) via uplink in a wireless communication system, the method comprising: transmitting a 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, wherein: if the RI is Rank-1 or Rank-2, a number of elements for the first WB PMI is 8, and the first WB PMI indicates one index of a subset having 8 indexes from among 16 indexes of the first WB PMI of a precoding codebook; and a user equipment (UE) preferred precoding matrix is indicated by a combination of the first WB PMI and the second WB PMI.