Channel state information transmission method and equipment

Abstract

The invention discloses a channel state information transmission method and equipment, aiming at solving the problems that the accuracy of channel state information that can be provided is limited dueto the limitation of a codebook structure in the prior art and a transmission scheme that a base station adopts an advanced preprocessing algorithm is not adapted. The method includes the following steps: a terminal determines a basis matrix according to a candidate beam vector set, wherein the basis matrix is a matrix formed by N beam vectors in the candidate beam vector set, and N is a positiveinteger; the terminal determines a merging coefficient matrix according to the basis matrix and channel state parameters; and the terminal feeds back identification information of the basis matrix and the merging coefficient matrix to the base station. Thereby, the accuracy of channel state information feedback can be effectively improved, and the performance of multi-antenna transmission, especially MU-MIMO transmission can be improved.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a transmission method and equipment for channel state information. Background technique [0002] The Long Term Evolution (LTE for short) Release 8 (Rel-8) system introduces a closed-loop precoding technology to improve spectrum efficiency. The closed-loop precoding technology requires both the base station and the terminal to store the same set of precoding matrices, which is called a codebook. After estimating the channel information according to the common pilot of the cell, the terminal selects a precoding matrix from the codebook according to certain criteria. The index of the precoding matrix in the codebook is fed back to the base station through the uplink channel, and the index is recorded as (Precoding Matrix Indicator, PMI for short); the base station can determine the precoding matrix that should be used for the terminal according to the received index ...

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a channel state information transmission method and device, which are used to solve the limitation of the codebook structure in the prior art. These codebook-based feedback schemes can provide channel state information with limited accuracy, which is not suitable for Problems with transmission schemes using advanced preprocessing algorithms on the base station side

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