US 11,968,720 B2
Alternative two-step RACH procedure
Mahmoud Taherzadeh Boroujeni, San Diego, CA (US); Tao Luo, San Diego, CA (US); Xiaoxia Zhang, San Diego, CA (US); and Jing Sun, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Mar. 3, 2021, as Appl. No. 17/190,723.
Claims priority of provisional application 63/005,053, filed on Apr. 3, 2020.
Prior Publication US 2021/0315016 A1, Oct. 7, 2021
Int. Cl. H04W 74/08 (2009.01); H04W 56/00 (2009.01); H04W 72/0446 (2023.01); H04W 72/0453 (2023.01); H04W 72/23 (2023.01); H04W 74/00 (2009.01); H04W 74/0833 (2024.01)
CPC H04W 74/0833 (2013.01) [H04W 56/001 (2013.01); H04W 72/0446 (2013.01); H04W 72/0453 (2013.01); H04W 72/23 (2023.01); H04W 74/008 (2013.01)] 30 Claims
OG exemplary drawing
 
1. A user equipment (UE) for wireless communication, comprising: one or more memories; and
one or more processors, coupled to the one or more memories, configured to:
perform an initial random access channel (RACH) attempt by transmitting, to a network entity, an initial request message of an initial two-step RACH procedure,
wherein to transmit the initial request message, the one or more processors are configured to transmit an initial request message preamble according to an initial transmission procedure; and
perform an additional RACH attempt, using an alternative two-step RACH procedure, based at least in part on determining that an initial response message, corresponding to the initial request message, of the two-step RACH procedure is not received during an initial random access response (RAR) window,
wherein to perform the additional RACH using the alternative two-step RACH procedure, the one or more processors are configured to transmit at least one additional request message preamble according to an additional transmission procedure that is different than the initial transmission procedure,
wherein the at least one additional request message preamble comprises a plurality of preamble sequences, and
wherein each preamble sequence of the plurality of preamble sequences is linked to each other preamble sequence of the plurality of preamble sequences.