US 12,335,004 B2
Sounding reference signal beamformer enhancement with timing correction
Raghavendra Madanahally Ramakrishna, Bangalore (IN); Ronak Bharatkumar Lalwala, Bangalore (IN); Venkatesh Hampasandra Muralidhara, Bangalore (IN); and Anurag Gupta, Bangalore (IN)
Assigned to RAKUTEN SYMPHONY, INC., Tokyo (JP)
Appl. No. 18/276,719
Filed by Rakuten Symphony, Inc., Tokyo (JP)
PCT Filed Nov. 23, 2022, PCT No. PCT/US2022/050848
§ 371(c)(1), (2) Date Aug. 10, 2023,
PCT Pub. No. WO2024/112333, PCT Pub. Date May 30, 2024.
Prior Publication US 2025/0007578 A1, Jan. 2, 2025
Int. Cl. H04B 7/06 (2006.01); H04L 5/00 (2006.01); H04L 25/02 (2006.01)
CPC H04B 7/0617 (2013.01) [H04L 5/0051 (2013.01); H04L 25/0226 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method of estimating beamforming weights, the method comprising:
receiving a Sounding Reference Signal (SRS) at an Open Radio Access Network (O-RAN) Distributed Unit (O-DU);
performing channel estimation of the SRS received;
computing a time domain response on the SRS channel estimation at a level of granularity as defined by a bandwidth of the SRS;
determining a timing offset at the defined level of granularity;
compensating for the timing offset at the defined level of granularity;
estimating the beamforming weights according to the compensated timing offset; and
transmitting the estimated beamforming weights to an O-RAN Radio Unit (O-RU) over a fronthaul interface between the O-DU and the O-RU.