CSI OBTAINING METHOD AND DEVICE

The present application relates to the technical field of communications, and provides a CSI obtaining method and device, which can improve the stability of obtained CSI, thereby improving the perception precision. The method comprises: when a first node is in a perception mode, the first node receives at least one first signal frame from a second node; the first node processes the at least one first signal frame by using the same AGC gain; and the first node obtains CSI according to the processed at least one first signal frame. In this way, the first node can process different perception messages by using the same AGC gain to obtain the CSI, such that the influence of the processing of the bottom layer of the first node can be well shielded, and the obtained CSI is more stable; moreover, when a target is precepted by using the CSI having relatively high stability, the perception precision can also be improved, for example, the state of the target such as a static state and a motion state is better distingui