US 12,295,037 B2
Methods and apparatus for msg-A transmission in two-step RACH
Loic Canonne-Velasquez, Dorval (CA); Afshin Haghighat, Ile-Bizard (CA); Shahrokh Nayeb Nazar, San Diego, CA (US); and J. Patrick Tooher, Montreal (CA)
Assigned to INTERDIGITAL PATENT HOLDINGS, INC., Wilmington, DE (US)
Appl. No. 17/430,885
Filed by INTERDIGITAL PATENT HOLDINGS, INC., Wilmington, DE (US)
PCT Filed Feb. 11, 2020, PCT No. PCT/US2020/017706
§ 371(c)(1), (2) Date Aug. 13, 2021,
PCT Pub. No. WO2020/167794, PCT Pub. Date Aug. 20, 2020.
Claims priority of provisional application 62/908,878, filed on Oct. 1, 2019.
Claims priority of provisional application 62/840,698, filed on Apr. 30, 2019.
Claims priority of provisional application 62/824,715, filed on Mar. 27, 2019.
Claims priority of provisional application 62/805,079, filed on Feb. 13, 2019.
Prior Publication US 2022/0086915 A1, Mar. 17, 2022
Int. Cl. H04W 74/08 (2024.01); H04W 74/00 (2009.01); H04W 74/0833 (2024.01)
CPC H04W 74/0833 (2013.01) [H04W 74/006 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A wireless transmit/receive unit (WTRU) configured to perform a 2-step random access channel (RACH) procedure, the WTRU comprising:
a transceiver; and
a processor, wherein:
the processor is configured to select a random access preamble having a preamble index;
the processor is further configured to determine a scrambling sequence for a physical uplink shared channel (PUSCH) transmission, wherein the scrambling sequence for the PUSCH transmission is initialized as a function of a random access-radio network temporary identifier (RA-RNTI) and the preamble index, wherein the RA-RNTI is based on a symbol, a slot, a frequency, and a carrier identifier (ID); and
the transceiver is configured to send a message to a network node, wherein the message comprises the selected random access preamble and the PUSCH transmission, wherein the PUSCH transmission is scrambled with the determined scrambling sequence that is based on the RA-RNTI and the preamble index.