US 12,328,698 B2
Reconfigurable intelligent surface assisted sidelink ranging
Shuanshuan Wu, San Diego, CA (US); Kapil Gulati, Belle Mead, NJ (US); Junyi Li, Fairless Hills, PA (US); Sourjya Dutta, San Diego, CA (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 Aug. 23, 2021, as Appl. No. 17/409,739.
Prior Publication US 2023/0057620 A1, Feb. 23, 2023
Int. Cl. H04W 56/00 (2009.01); H04L 5/00 (2006.01); H04L 43/0864 (2022.01); H04W 76/14 (2018.01)
CPC H04W 56/004 (2013.01) [H04L 5/0048 (2013.01); H04L 43/0864 (2013.01); H04W 76/14 (2018.02)] 24 Claims
OG exemplary drawing
 
1. An apparatus for wireless communication at a first user equipment (UE), comprising:
a memory; and
at least one processor coupled to the memory and configured to:
receive information indicating at least a time in which at least one reconfigurable intelligent surface (RIS) is to be activated, wherein the at least one RIS is deactivated outside of the indicated time;
transmit a first set of reference signals to a second UE via the at least one RIS while the at least one RIS is activated based on the information;
receive a second set of reference signals from the second UE via the at least one RIS while the at least one RIS is activated based on the information;
transmit a third set of reference signals to the second UE via the at least one RIS while the at least one RIS is deactivated based on the information;
receive a fourth set of reference signals from the second UE via the at least one RIS while the at least one RIS is deactivated based on the information;
calculate a first signal round-trip time (RTT) based on the first set of reference signals and the second set of reference signals and a second signal RTT based on the third set of reference signals and the fourth set of reference signals; and
determine a range between the first UE and the second UE based on the first signal RTT or the second signal RTT whichever has a smaller RTT value.