Patent ID: 8532218

Claim:
A method for feeding back channel status information by a terminal in long term evolution-advanced (LTE-A), the method comprising: quantizing the channel status information by using a codebook, and feeding back the channel status information through a physical uplink control channel; wherein, when the channel status information is fed back on the physical uplink control channel, code words contained in the used codebook C PUCCH (r) are a subset of code words contained in the codebook C PUSCH (r) in an overall codebook defined in the LTE-A, wherein the used codebook C PUCCH (r) represents codebook C PUCCH (r) with a layer number or rank being r, and the codebook C PUSCH (r) represents codebook C PUSCH (r) with a layer number or rank being r; wherein, the C PUCCH (r) is a single codebook or a single codebook equivalent to dual codebooks; and the C PUSCH (r) is a single codebook or a single codebook equivalent to dual codebooks; and the single codebook equivalent to the dual codebooks refers to an actually defined single codebook, in which 2 pre-coding matrix identifiers are required to determine a codebook of the code words therein for an established r; wherein r is a positive integer.