IP Library › Granted Patent US 12689421
Granted Patent B2
US 12689421 · App. 18/145,962 · Granted Jul 21, 2026

Reduced complexity in uplink receive beamformer calculations

Inventors: Ahmed Gamal Helmy Mohamed (San Jose, CA); Mustafa Emin Sahin (Mckinney, TX); Krishna Srikanth Gomadam (San Jose, CA)
Assignee: META PLATFORMS, INC.
H04B7/0617H04L5/0051H04L25/0242
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Quick Facts
Patent No.
US 12689421
App. No.
18/145,962
Granted
Jul 21, 2026
Kind
B2
Abstract

Methods, systems, and apparatuses for calculating and using uplink receive beamformers in wireless devices. In a demodulation reference signal (DMRS)-based beamformer calculation scheme, the computational complexity might be overwhelmingly high if a unique beamformer is calculated for each and every single resource element (RE). There may be combinations via frequency, time, or other means across resource block groups (RBGs) to consolidate the number of beamformers to be calculated.

Claims (44)

1 . An apparatus comprising:

one or more processors; and

memory coupled with the one or more processors, the memory storing executable instructions that when executed by the one or more processors cause the one or more processors to effectuate operations comprising:

receiving a demodulation reference signal (DMRS);

determining a DMRS anchor, wherein the DMRS anchor comprises a resource element, and wherein the DMRS anchor is based on an indicated availability of computational resources of the apparatus;

determining a channel estimate at the DMRS anchor based on the DMRS for user equipments (UEs) scheduled in that resource block group (RBG);

based on the channel estimate, forming a channel matrix;

determining a beamformer matrix of the DMRS anchor based on the channel matrix;

associating the DMRS anchor with an influence region, wherein the influence region comprises a plurality of resource elements; and

assigning the beamformer matrix of the DMRS anchor to the influence region.

2 . The apparatus of claim 1 , the operations further comprising determining port reduction based on the assigned beamformer matrix of the influence region.

3 . The apparatus of claim 1 , wherein the channel estimate is performed in a radio unit.

4 . The apparatus of claim 1 , wherein the DMRS anchor is based on channel coherence between DMRS resource elements.

5 . The apparatus of claim 1 , wherein the DMRS anchor is based on an amount of UEs scheduled in the RBG.

6 . The apparatus of claim 1 , wherein the apparatus is a base station.

7 . The apparatus of claim 1 , wherein the channel matrix comprises a number of receive chains divided by a number of uplink layers.

8 . An apparatus comprising:

one or more processors; and

memory coupled with the one or more processors, the memory storing executable instructions that when executed by the one or more processors cause the one or more processors to effectuate operations comprising:

receiving a demodulation reference signal (DMRS);

receiving an indication of a first DMRS anchor, wherein the first DMRS anchor comprises a first resource element;

receiving an indication of a second DMRS anchor, wherein the second DMRS anchor comprises a second resource element;

determining a channel estimate of the first DMRS anchor based on the DMRS;

determining a channel estimate of the second DMRS anchor based on the DMRS;

combining the channel estimates of the first DMRS anchor and the second DMRS anchor to create a combined DMRS anchor;

determining a beamformer matrix of the combined DMRS anchor based on the channel estimate;

associating the combined DMRS anchor with an influence region, wherein the influence region comprises a plurality of resource elements;

assigning the beamformer matrix of the combined DRMS anchor to the influence region; and

determining port reduction based on the assigned beamformer matrix of the influence region.

9 . The apparatus of claim 8 , wherein the channel estimate is performed in a radio unit.

10 . The apparatus of claim 8 , wherein the apparatus is a base station.

11 . A method comprising:

receiving a demodulation reference signal (DMRS);

determining a DMRS anchor, wherein the DMRS anchor comprises a resource element, and wherein the DMRS anchor is based on an indicated availability of computational resources of an apparatus;

determining a channel estimate at the DMRS anchor based on the DMRS for user equipments (UEs) scheduled in that resource block group (RBG);

based on the channel estimate, forming a channel matrix;

determining a beamformer matrix of the DMRS anchor based on the channel matrix;

associating the DMRS anchor with an influence region, wherein the influence region comprises a plurality of resource elements; and

assigning the beamformer matrix of the DRMS anchor to the influence region.

12 . The method of claim 11 , further comprising determining port reduction based on the assigned beamformer matrix of the influence region.

13 . The method of claim 11 , wherein the channel estimate is performed in a radio unit.

14 . The method of claim 11 , wherein the DMRS anchor is based on channel coherence between DMRS resource elements.

15 . The method of claim 11 , wherein the DMRS anchor is based on an amount of UEs scheduled in the RBG.

16 . The method of claim 11 , wherein the channel matrix comprises a number of receive chains divided by a number of uplink layers.