| abstract |
Disclosed is a method for reporting channel state, for achieving channel state reporting based on CSI-RS. The method includes: detecting by the UE configuration information about a CSI reference signal (CSI-RS), determining the number of ports required by channel state reporting based on CSI-RS, and determining that the eNB will map the data of the physical downlink shared channel (PDSCH) onto P CSI-RS ports in the manner of codebook-based pre-coding and transmitting the same when it is confirmed that the eNB employs the PMI transmission strategy based on CSI-RS according to the correlation between the pre-configured number of ports and the transmission strategy, wherein the codebook-based pre-coding method is the method indicated by formula [Formula I], with W indicating a codebook composed of a pre-coding matrix, S indicating the PDSCH data composed of a number (rank indicator (RI)) of data layers, and [Formula II] indicating a vector composed of the data of P CSI-RS ports; and computing and reporting by the UE the channel state information according to the determined result. Also disclosed is a device for achieving the method. |