US 11,963,237 B2
Methods, apparatus, systems and procedures for distance dependent random access channel (RACH) preamble selection in non-terrestrial networks (NTNS)
Nagi Mahalingam, San Diego, CA (US); Anantharaman Balasubramanian, San Diego, CA (US); Ravikumar V. Pragada, Warrington, PA (US); Faris Alfarhan, Montreal (CA); and Yugeswar Deenoo, Chalfont, PA (US)
Assigned to InterDigital Patent Holdings, Inc., Wilmington, DE (US)
Appl. No. 17/289,143
Filed by InterDigital Patent Holdings, Inc., Wilmington, DE (US)
PCT Filed Oct. 22, 2019, PCT No. PCT/US2019/057390
§ 371(c)(1), (2) Date Apr. 27, 2021,
PCT Pub. No. WO2020/092059, PCT Pub. Date May 7, 2020.
Claims priority of provisional application 62/752,453, filed on Oct. 30, 2018.
Prior Publication US 2021/0385879 A1, Dec. 9, 2021
Int. Cl. H04W 74/08 (2009.01); H04W 72/1263 (2023.01); H04W 74/0833 (2024.01)
CPC H04W 74/0841 (2013.01) [H04W 72/1263 (2013.01); H04W 74/0866 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method implemented by Wireless Transmit/Receive Unit (WTRU), the method comprising:
receiving, by the WTRU from a Network Access Point (NAP), configuration information indicating a set of preambles and corresponding propagation-delay thresholds;
determining propagation-delay information associated with a distance between the WTRU and the NAP or a location in a coverage area of the NAP;
selecting a subset of preambles from the set of preambles based on the determined propagation-delay information;
randomly selecting a preamble from the selected subset of preambles; and
sending the randomly selected preamble to the NAP.