Csi feedback for large antenna arrays by aggregating multiple csi-rs resources

Abstract

Systems and methods are disclosed for Channel State Information (CSI) feedback. In one embodiment, a method performed by a User Equipment (UE) comprises receiving, from a network node, a configuration for CSI feedback based on a codebook for PCSI-RS > 32 antenna ports, the configuration comprising M>1 CSI Reference Signal (CSI-RS) resources, each with N ≤ 32 CSI-RS ports, for channel measurement, wherein the PCSI-RS antenna ports comprise N1 ports in a first dimension and N2 ports in a second dimension, wherein PCSI-RS = 2N1N2 = M ∙N. The method further comprises determining a port mapping between each of the PCSI-RS antenna ports and one of the CSI-RS ports of one of the M CSI-RS resources, performing measurements on downlink channels associated to the PCSI-RS antenna ports based on the M CSI-RS resources and the determined port mapping, computing a precoding matrix based thereon, and sending, to the network node, an associated precoding matrix indicator (PMI).

Images