CSI REPORTING METHOD AND APPARATUS, PRECODING MATRIX DETERMINING METHOD AND APPARATUS, AND DEVICE

Abstract

The present application relates to the field of mobile communications, and discloses a CSI reporting method and apparatus, a precoding matrix determining method and apparatus, and a device. The method comprises: receiving downlink pilot signals sent by a network device at T consecutive moments; estimating downlink channel information at the T consecutive moments according to the downlink pilot signals at the T consecutive moments; determining, according to the downlink channel information at the T consecutive moments, CSI corresponding to the T consecutive moments; and reporting the CSI to the network device, wherein the CSI is used by the network device to calculate a precoding matrix for downlink data transmission at the moment t, and the moment t is later than the T consecutive moments. According to the present application, the network device can calculate the precoding matrixes at different moments in the future according to the CSI reported by a terminal device at a time. The terminal device is prevented from frequently reporting the CSI due to rapid movement of the terminal device while the data transmission performance is ensured, the period in which the terminal device reports the CSI is reduced, and the uplink feedback overhead of the terminal device is reduced.

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