Patent ID: 8705482

Claim:
A method of reporting channel state information is characterized in that which comprises: User terminal selects the codebook used during PMI (precoding matrix indication) reporting from a second-stage codebook, and selects PMI from this codebook; said double-stage codebook includes the codebook reflecting long-termlbroadband information and the codebook reflecting short-term/ selective channel frequency information; Said user terminal determines the parameter used during CQI (channel quality indication) calculation and calculates CQI based on this parameter; the determined parameter used during CQI calculation through PUCCH reporting involves PMI reported by said user terminal through PUSCH; during reporting through PUSCH, the determined parameter used for CQI calculation includes PMI reported by said user terminal through PUCCH; Said user terminal reports rank indication (RI), the selected PMI and calculated CQI according to the specified reporting mode.