US 12,231,989 B2
High accuracy ORAN radio unit synchronization error estimation
Vitaly Lutsky, Rosh Haayin (IL)
Assigned to ASOCS Ltd., Rosh Haayin (IL)
Filed by ASOCS Ltd., Rosh Haayin (IL)
Filed on Apr. 13, 2022, as Appl. No. 17/659,051.
Claims priority of provisional application 63/174,219, filed on Apr. 13, 2021.
Prior Publication US 2022/0337973 A1, Oct. 20, 2022
Int. Cl. H04W 4/029 (2018.01); G01S 5/02 (2010.01); H04W 56/00 (2009.01)
CPC H04W 4/029 (2018.02) [G01S 5/0218 (2020.05); G01S 5/02216 (2020.05); G01S 5/0294 (2013.01); H04W 56/006 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A system for providing high-accuracy position estimation for mobile user equipment (UE) configured for use within a service area covered by a plurality of ORAN radio units (O-RUs) with known position including coordinates, the system comprising:
a memory including computer-executable instructions; and
a processor coupled to the memory and operative to execute the computer-executable instructions, the computer-executable instructions causing the processor to,
(a) derive a channel estimate for a channel between a given UE and each of a plurality of O-RUs based on a sounding reference signal (SRS) received from the UE;
(b) select a subset of the O-RUs based on a selection criterion for the respective channel estimates;
(c) calculate the shortest delay for the given UE in a multipath environment to each O-RU in the subset, forming a set of uplink-time-difference-of-arrival (UL-TDOA) measurements representing the shortest delays to the O-RUs in the subset;
(d) estimate position of the given UE in the service area based on the UL-TDOA measurements; and
(e) estimate O-RU synchronization error for each O-RU in the subset using estimated positions of the given UE and corresponding UL-TDOA measurements.