Patent ID: 9258048
Filing Date: 2016-02-09
CPC Classification: H04B,H04L

Claim Text:
1. A method for feeding back channel state information, comprising: a piece of User Equipment (UE) determining channel state information which comprises a first-type Precoding Matrix Index (PMI) and a second-type PMI according to indication information, wherein the first-type PMI is used for indicating an index of one first precoding matrix in a first precoding codebook, and each first precoding matrix is used for mapping channel information of one wideband and/or long-term channel; and the second-type PMI is used for indicating an index of one second precoding matrix in a second precoding codebook, and each second precoding matrix is used for mapping channel information of one subband and/or short-term channel; and the UE feeding back the first-type PMI in a Physical Uplink Control Channel (PUCCH) periodically and feeding back the second-type PMI in a Physical Uplink Shared Channel (PUSCH) periodically or non-periodically; or, feeding back the first-type PMI and the second-type PMI in the PUCCH; wherein the step of the UE feeding back the first-type PMI in the PUCCH periodically and feeding back the second-type PMI in the PUSCH, or the UE feeding back the first-type PMI and the second-type PMI in the PUCCH comprises: wherein the step of the UE feeding back the second-type PMI in the PUCCH in the mode of single UE-selected subband PMI comprises: wherein the step of the UE selecting one subband from each BP in the multiple BPs comprises: wherein the step of the UE feeding back the second-type PMI in the PUCCH in the mode of single UE-selected subband CQI and single UE-selected subband PMI comprises: wherein the step of the UE selecting one subband from each BP in the multiple BPs comprises: wherein the step of the UE feeding back the second-type PMI in the PUCCH in the mode of CQI and PMI of the single BP comprises: wherein the step of the UE selecting one subband from each BP in the multiple BPs comprises: