US 12,237,884 B2
Enhancement to multi-user MIMO by channel state information reporting
Louay Jalloul, San Jose, CA (US); and Ghaith N. Hattab, Santa Clara, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Aug. 15, 2022, as Appl. No. 17/887,899.
Claims priority of provisional application 63/248,419, filed on Sep. 24, 2021.
Prior Publication US 2023/0098863 A1, Mar. 30, 2023
Int. Cl. H04B 7/0452 (2017.01); H04B 7/0456 (2017.01); H04L 5/00 (2006.01); H04W 72/1273 (2023.01)
CPC H04B 7/0452 (2013.01) [H04B 7/0456 (2013.01); H04L 5/0051 (2013.01); H04L 5/0057 (2013.01); H04W 72/1273 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A base station for configuring multi-user multiple-input multiple output (MU-MIMO) operation between the base station and a plurality of UEs, the base station comprising:
circuitry for sending data to and receiving data from the plurality of UEs;
one or more processing devices; and
memory storing instructions that, when executed by the one or more processing devices, cause the one or more processing devices to perform operations comprising:
requesting sounding reference signals (SRS) or channel state information (CSI) data from each UE of the plurality of UEs;
configuring, based on the SRS or CSI data from each UE, a precoder matrix, the precoder matrix allocating a plurality of precoded CSI-reference signal (CSI-RS) resources for each UE;
scheduling, for each UE in the plurality, the precoded CSI-RS resources;
receiving, from each UE in the plurality, a CQI report that is based on the precoded CSI-RS resources received by that respective UE;
generating a CQI matrix from the CQI reports of each UE in the plurality;
selecting a subset of UEs from the plurality of UEs based on the CQI matrix; and
scheduling DL resources for the subset of UEs, the DL resources including reference signals.