公开(公告)号：US20220021426A1

公开(公告)日：2022-01-20

申请号：US17378285

申请日：2021-07-16

Applicant: NOKIA TECHNOLOGIES OY

Inventor： Olli PIIRAINEN ,  Jari YLIOINAS

IPC: H04B7/0456 ,  H04W52/24 ,  H04B7/024

Abstract: According to an aspect, there is provided an apparatus for performing beamforming optimization for a MIMO architecture. The apparatus maintains, in a database, channel state information of a plurality of radio channels comprising first and second order statistics. The apparatus calculates, separately for each of two or more remote radio units using an eigenbeamforming scheme, first sets of beamforming weights based on the second order statistics. Then, the apparatus performs, for each terminal device, single-user MIMO optimization between the two or more remote radio units to maximize a pre-defined metric, being a mutual information metric or signal-to-interference-plus-noise, based on first sets of beamforming weights and the first order statistics. The result, for each terminal device, is a second set of beamforming weights. The apparatus causes transmitting data using beams formed by applying both first and second sets of optimized beamforming weights at the two or more remote radio units.