	US 11,855,746 B2
	Inter-satellite link aided UE positioning in non-terrestrial network
Weimin Duan, San Diego, CA (US); Jun Ma, San Diego, CA (US); Mehmet Izzet Gurelli, San Diego, CA (US); Huilin Xu, Temecula, CA (US); and Qiang Wu, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Dec. 7, 2021, as Appl. No. 17/643,069.
Prior Publication US 2023/0179295 A1, Jun. 8, 2023
Int. Cl. H04B 7/185 (2006.01); H04L 5/00 (2006.01)

CPC H04B 7/18554 (2013.01) [H04B 7/18543 (2013.01); H04L 5/0051 (2013.01)]

30 Claims

1. An apparatus for wireless communication at a user equipment (UE), comprising:

memory;

at least one transceiver; and

at least one processor communicatively connected to the memory and the at least one transceiver, the at least one processor configured to:

receive, from a first satellite, a first positioning reference signal (PRS) at a first reception time (T__Rx__sat_₁);

receive, from a second satellite, a second PRS at a second reception time (T__Rx__sat_₂) and an indication of a transmission-reception time difference (T_{sat_2_Tx→Rx}), the transmission-reception time difference (T_{sat_2_Tx→Rx}) being a difference between a time the second satellite transmits the second PRS to the UE and a time the second satellite receives a reference signal (RS) from the first satellite; and

calculate a reference signal time difference (RSTD) for the first PRS and the second PRS based at least in part on the first reception time of the first PRS (T__Rx__sat_₁), the second reception time of the second PRS (T__Rx__sat_₂), and the transmission-reception time difference (T_{sat_2_Tx→Rx}).