Granted Patent B2

US 12,273,839 · App. 18/770,114 · Granted Apr 8, 2025

Inventors: Nagi Mahalingam (San Diego, CA); Anantharaman Balasubramanian (San Diego, CA); Mihaela Beluri (Jericho, NY); Ravikumar V. Pragada (Warrington, PA); Mahmoud Taherzadeh Boroujeni (San Diego, CA); Shahrokh Nayeb Nazar (San Diego, CA); Seyed Mohsen Hosseinian (San Diego, CA); Frank La Sita (Long Beach, NY)

Assignee: InterDigital Patent Holdings, Inc.

H04W56/0045H04B7/18513H04W56/0005H04W74/0833

Abstract

Claims (29)

1. A method performed by a wireless transmit and receive unit (WTRU), the method comprising:

receiving, from a spaceborne satellite, system information that includes a position of, and trajectory parameters about, the spaceborne satellite;

determining a position of the WTRU using a global navigation satellite system (GNSS);

determining a timing advance (TA) based on the determined WTRU position and the system information wherein the determined TA provides for compensation for a round trip time (RTT) between the WTRU and the spaceborne satellite; and

transmitting a signal using the TA.

2. The method of claim 1 , wherein the system information indicates one or more physical-random-access-channel (PRACH) resources.

3. The method of claim 2 , further comprising:

receiving a random-access response (RAR)

wherein the RAR includes a TA command;

determining an adjusted TA based on the TA command and the estimated propagation delay; and

transmitting a message using the adjusted TA.

4. The method of claim 3 , wherein the RAR further includes at least one of a power correction, an uplink grant, or a temporary identifier.

5. The method of claim 3 , wherein the RAR includes a two-part bitfield, wherein a first part of the two-part bitfield has a high-resolution TA and a second part of the two-part bitfield has a low-resolution TA.

6. The method of claim 1 , wherein the transmitting the signal occurs at a random-access-channel (RACH) opportunity indicated in the system information.

7. A wireless transmit-and-receive unit (WTRU), the WTRU comprising:

a processor; and

a transceiver, wherein the processor and transceiver are configured to:

receive, from a spaceborne satellite, system information that includes a position of, and trajectory parameters about, the spaceborne satellite;

determine a position of the WTRU using a global navigation satellite system (GNSS);

determine a timing advance (TA) based on the determined position of the WTRU and the system information wherein the determined TA provides for compensation for a round trip time (RTT) between the WTRU and the spaceborne satellite; and

transmit a signal using the TA.

8. The WTRU of claim 7 , wherein the system information indicates one or more physical-random-access-channel (PRACH) resources.

9. The WTRU of claim 8 , wherein the processor and transceiver are further configured to:

receive a random-access response (RAR), wherein the RAR includes a TA command;

determine an adjusted TA based on the TA command and the estimated propagation delay; and

transmit a message using the adjusted TA.

10. The WTRU of claim 9 , wherein the RAR further includes at least one of a power correction, an uplink grant, or a temporary identifier.

11. The WTRU of claim 9 , wherein the RAR includes a two-part bitfield, wherein a first part of the two-part bitfield has a high-resolution TA and a second part of the two-part bitfield has a low-resolution TA.

12. The WTRU of claim 7 , wherein the processor and transceiver are further configured to transmit the signal at a random-access-channel (RACH) opportunity indicated in the system information.

Continuity (4)

References Cited (103)