US 12,308,965 B2
Codebook based zero-forced MU-MIMO beamforming
Israfil Bahceci, Kanata (CA)
Assigned to Telefonaktiebolaget LM Ericsson (Publ), Stockholm (SE)
Appl. No. 17/910,872
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Apr. 7, 2020, PCT No. PCT/IB2020/053328
§ 371(c)(1), (2) Date Sep. 12, 2022,
PCT Pub. No. WO2021/205206, PCT Pub. Date Oct. 14, 2021.
Prior Publication US 2023/0119746 A1, Apr. 20, 2023
Int. Cl. H04L 1/06 (2006.01); H04B 7/0452 (2017.01); H04B 7/06 (2006.01)
CPC H04L 1/0693 (2013.01) [H04B 7/0452 (2013.01); H04B 7/0639 (2013.01); H04B 7/0658 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A network node configured to communicate with a plurality of wireless devices, the network node comprising:
processing circuitry configured to:
receive partial Channel State Information, CSI, from each of the plurality of wireless devices;
determine a first plurality of precoders based at least in part on the partial CSI received from each of the plurality of wireless devices, each precoder of the first plurality of precoders being associated with a respective one of the plurality of wireless devices;
determine a second plurality of precoders based at least in part on the first plurality of precoders;
one or both of:
perform a first rank reduction on the first plurality of precoders; and
perform a second rank reduction on the second plurality of precoders; and
cause multiple-user multiple-input multiple-output, MU-MIMO, transmission to the plurality of wireless devices based at least in part on the plurality of second precoders, the MU-MIMO transmission being based at least in part on one or both of the first rank reduction and the second rank reduction.