METHOD AND APPARATUS FOR TRANSMITTING PRECODING MARTRIX INDEX AND PERFORMING PRECODING

摘要

A method and an apparatus for sending a Precoding Matrix Index (PMI) and performing precoding are provided in the embodiments of the present invention. The method for sending the PMI comprises the following steps: a user equipment acquires the transmission channel capability of carrying the PMI; according to the transmission channel capability of carrying the PMI, the precoding matrices are selected from a locally-stored first codebook set to form a second codebook set; a first precoding matrix is selected from the second codebook set; an index corresponding to the first precoding matrix is sent to a base station over the transmission channel so as to make the base station can find out the first precoding matrix according to the index and precode the data according to the first precoding matrix. The embodiments of the present invention can realize the flexible configuration and use of the PMI.

主权项

1. A method for transmitting a precoding matrix index (PMI), comprising:
acquiring, by a user equipment (UE), a capability of a transmission channel to carry the PMI, wherein the capability of the transmission channel to carry the PMI refers to a maximum number of bits for carrying the PMI on the transmission channel; forming, by the UE, a second codebook set as a subset of a first codebook set according to the capability of a transmission channel to carry the PMI, the first codebook set being locally stored on the UE; selecting, by the UE, a first precoding matrix from the second codebook set; and transmitting, by the UE, an index item corresponding to the first precoding matrix to a base station (BS) over the transmission channel.