CSI MEASUREMENT AND FEEDBACK METHOD, CSI MEASUREMENT AND FEEDBACK SYSTEM, AND BASE STATION

摘要

The present invention provides a CSI measurement and feedback method and system, and a base station when an LTE system works in an unlicensed spectrum. The method comprises: when a downlink service arrives, detecting a current downlink channel state, and sending CSI measurement configuration signaling and CSI feedback configuration signaling that correspond to the current downlink channel state to a terminal according to the current downlink channel state; or when a downlink service arrives, sending CSI measurement configuration signaling and CSI feedback configuration signaling that correspond to a specified downlink channel state to a terminal, so that after the terminal learns the downlink channel state, the terminal performs CSI measurement and a CSI feedback according to the CSI measurement configuration signaling and the CSI feedback configuration signaling that correspond to the downlink channel state. By means of the technical solutions of the present invention, it can be effectively ensured that CSI measurement and a CSI feedback can be normally performed after an LTE system introduces an LBT mechanism to an unlicensed spectrum.