OBTAINING METHOD AND DEVICE FOR CHANNEL INFORMATION

摘要

An obtaining method and device for channel information are provided in the present invention, which resolve the technical problem in the prior art that the channel information cannot be fed back flexibly according to the requirement. Wherein the obtaining method includes: for a sub-band, a User Equipment (UE) obtains Rank Indicator (RI) information of the current channel, in which the RI information indicates the rank (?) of the current channel, ? is a positive integer not more than 8; said user equipment determines the quantity of the Pre-coding Matrix Indicator (PMI) information needed to be fed back to a base station according to ?, and transmits the PMI information of said quantity and said RI information to the base station; the base station obtains the channel information of said sub-band according to the PMI information of said quantity and said RI information. The present invention is able to provide multiple feedback precisions, deploy feedback with different precisions according to specific requirement flexibly, and make use of the feedback overhead effectively.