Patent ID: 10193609

Abstract:
A method for feeding back CIS includes: dividing a plurality of antenna ports into a plurality of groups of antenna ports; configuring for each group a same intra-group codebook set consisting of a plurality of intra-group precoding matrices, allocating for each group a plurality of different reference signals corresponding to a same reference resource, and configuring for each antenna port in each group a precoded reference signal acquired after a precoding operation using the intra-group precoding matrices, the number of the reference resources corresponding to the number of the intra-group precoding matrices in the intra-group codebook set, and the number of the reference signals corresponding to each reference resource corresponding to the number of groups of inter-group antenna ports; transmitting the precoded reference signal to a UE via each antenna port; and receiving the CSI fed back by the UE after measurement on the reference signal.