Csi feedback with low overhead

Abstract

Example embodiments of the present disclosure relate to devices, methods, apparatuses and computer readable storage media of a Channel State Information (CSI) feedback with low overhead. The method comprises in response to receiving, from a second device, a reference signal on a channel between the first device and the second device, obtaining a first component and a second component from the reference signal, the first component and the second component being orthogonal to each other; determining a first transformed component and a second transformed component for characterizing the channel by performing a transformation on the first component and the second component; generating a set of parameters associated with characteristics of the channel by quantizing the first transformed component and the second transformed component; and transmitting the set of parameters to the second device. The proposed CSI feedback can even be flexibly combined with existing overhead reduction schemes such as the beamformed CSI-RS and CSI compression, which further reduces the CSI overhead. Furthermore, the proposed scheme ensures very fast processing at UE and reduces the latency.