Method for feeding back channel state information and an apparatus

An apparatus, comprising:

• a processor, and a non-transitory memory coupled with the processor;
• wherein the memory is configured to store instructions of a computer program which, when executed by the processor, and when the apparatus is comprised in a user equipment, cause the user equipment to:
• acquire first channel state information (CSI) based on a first CSI measurement resource configured by a base station, wherein the first CSI comprises a first type of precoding matrix indicator (PMI1) and a second type of precoding matrix indicator (PMI2) and a first rank indicator (RI1), and each of the PMI1, the PMI2, and the RI1 correspond to a first dimension of an array of transmitting antennas of the base station;
• acquire second CSI based on a second CSI measurement resource configured by the base station, and obtain a channel quality indicator (CQI) based on the first CSI and the second CSI, wherein the second CSI comprises a first type of precoding matrix indicator (PMI3) and a second type of precoding matrix indicator (PMI4) and a second rank indicator (RI2), each of the PMI3, the PMI4, and the RI2 correspond to a second dimension of the array of transmitting antennas of the base station, and the first dimension is perpendicular to the second dimension;
• obtain a channel quality indicator (CQI) based on the first CSI and the second CSI;
• and
• feed back CSI to the base station, wherein feeding back the CSI to the base station comprises:
• feeding back the first CSI to the base station according to a first feedback mode, and feeding back the second CSI to the base station according to a second feedback mode, wherein the second feedback mode is different from the first feedback mode;
• or
• feeding back third CSI according to a third feedback mode, wherein the third CSI is obtained by the processor based on the first CSI and the second CSI;
• wherein the third CSI comprises:
• the first CSI, the second CSI, and the CQI;
• or
• third precoding matrix indicator information, third rank indicator information, and the CQI, wherein the third precoding matrix indicator information is obtained based on at least three of the PMI1, the PMI2, the PMI3, and the PMI4, and the third rank indicator information is obtained based on the RI1 and the RI2;
• wherein the user equipment feeds back the CSI to the base station using a physical uplink control channel (PUCCH), and the user equipment feeds back the CSI in a CSI feedback cycle of the PUCCH, wherein the CSI feedback cycle comprises a first feedback timeslot, a second feedback timeslot, and a third feedback timeslot;
• and
• wherein the RI1, the RI2, the PMI1, and the PMI3 are fed back in the first feedback timeslot, the PMI2, the PMI4, and the CQI are fed back in the second feedback timeslot, and the PMI2, the PMI4, and the CQI are fed back in the third feedback timeslot.

A non-transitory computer-readable storage medium comprising instructions of a computer program which, when executed by a processor of a computer, cause the computer to:

• acquire first channel state information (CSI) based on a first CSI measurement resource configured by a base station, wherein the first CSI comprises a first type of precoding matrix indicator (PMI1) and a second type of precoding matrix indicator (PMI2) and a first rank indicator (RI1), and each of the PMI1, the PMI2, and the RI1 correspond to a first dimension of an array of transmitting antennas of the base station;
• acquire second CSI based on a second CSI measurement resource configured by the base station, and obtain a channel quality indicator (CQI) based on the first CSI and the second CSI, wherein the second CSI comprises a first type of precoding matrix indicator (PMI3) and a second type of precoding matrix indicator (PMI4) and a second rank indicator (RI2), each of the PMI3, the PMI4, and the RI2 correspond to a second dimension of the array of transmitting antennas of the base station, and the first dimension is perpendicular to the second dimension;
• obtain a channel quality indicator (CQI) based on the first CSI and the second CSI;
• and
• feed back CSI to the base station, wherein feeding back the CSI to the base station comprises:
• feeding back the first CSI to the base station according to a first feedback mode, and feeding back the second CSI to the base station according to a second feedback mode, wherein the second feedback mode is different from the first feedback mode;
• or
• feeding back third CSI according to a third feedback mode, wherein the third CSI is obtained by the processor based on the first CSI and the second CSI;
• wherein the third CSI comprises:
• the first CSI, the second CSI, and the CQI;
• or
• third precoding matrix indicator information, third rank indicator information, and the CQI, wherein the third precoding matrix indicator information is obtained based on at least three of the PMI1, the PMI2, the PMI3, and the PMI4, and the third rank indicator information is obtained based on the RI1 and the RI2;
• wherein the CSI further comprises a precoding matrix type indicator (PTI) indicating a type of a precoding matrix, and when the precoding matrix is of a first type, the CSI is fed back to the base station in a CSI feedback cycle of a physical uplink control channel (PUCCH), and the CSI feedback cycle comprises a first feedback timeslot, a second feedback timeslot, a third feedback timeslot, a fourth feedback timeslot, a fifth feedback timeslot, and a sixth feedback timeslot;
• and
• wherein the RI1 or the RI2 are fed back in the first feedback timeslot, the PMI1 is fed back in the second feedback timeslot, PMI3 is fed back in the third feedback timeslot, the PMI3 and the CQI are fed back in the fourth feedback timeslot, the PMI3 and the CQI are fed back in the fifth feedback timeslot, and the RI1 or the RI2 are fed back in the sixth feedback timeslot.