US 12,245,185 B2
Sidelink positioning in presence of clock error
Chang-Sik Choi, Hillsborough, NJ (US); Kapil Gulati, Belle Mead, NJ (US); Sudhir Kumar Baghel, Hillsborough, NJ (US); and Anantharaman Balasubramanian, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Nov. 6, 2020, as Appl. No. 17/092,003.
Prior Publication US 2022/0150863 A1, May 12, 2022
Int. Cl. H04W 64/00 (2009.01); G01S 5/10 (2006.01); H04L 12/26 (2006.01); H04L 43/0864 (2022.01)
CPC H04W 64/003 (2013.01) [G01S 5/10 (2013.01); H04L 43/0864 (2013.01)] 43 Claims
OG exemplary drawing
 
1. A method, comprising:
transmitting, by a first station, a first message including an indication of whether a clock reconfiguration event occurs at the first station, wherein the reconfiguration event is at a local clock source of the first station and changes properties of the local clock at the first station and wherein the reconfiguration event at the local clock source changes a clock error between the first station and a second station;
transmitting, by the first station, a first positioning reference signal (PRS);
receiving, by the first station and from the second station, a second PRS; and
transmitting, by the first station to the second station, a second message including a first time when the first PRS is transmitted by the first station and a second time when the second PRS is received by the first station, to enable the second station to determine a roundtrip time (RTT) between the first station and the second station based on the first time, the second time, a third time when the second station receives the first PRS, a fourth time when the second station transmits the second PRS, and the indication, wherein the indication is used by the second station to determine whether to utilize a prior estimate of clock error associated with the local clock of the first station in conjunction with a Quasi CoLocation (QCL) operation or whether to disable the QCL operation and generate a new estimate of the clock error.