US 12,010,734 B2
2-step RACH initiated by PDCCH order
Sergey Sosnin, Zavolzhie (RU); Gang Xiong, Portland, OR (US); Alexey Khoryaev, Nizhny Novgorod (RU); and Seunghee Han, San Jose, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Appl. No. 17/420,097
Filed by Apple Inc., Cupertino, CA (US)
PCT Filed Feb. 17, 2020, PCT No. PCT/US2020/018525
§ 371(c)(1), (2) Date Jun. 30, 2021,
PCT Pub. No. WO2020/168331, PCT Pub. Date Aug. 20, 2020.
Claims priority of provisional application 62/806,203, filed on Feb. 15, 2019.
Prior Publication US 2022/0095388 A1, Mar. 24, 2022
Int. Cl. H04W 4/00 (2018.01); H04W 72/0453 (2023.01); H04W 74/00 (2009.01); H04W 74/08 (2009.01); H04W 74/0833 (2024.01)
CPC H04W 74/0841 (2013.01) [H04W 72/0453 (2013.01); H04W 74/006 (2013.01); H04W 74/0866 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of operating a base station (BS) comprising:
configuring, by the BS, a different search space configuration for a physical downlink control channel (PDCCH) ordered physical random access channel (PRACH) for an ordered 2-step random access channel (RACH) procedure compared to a PRACH of a 4-step RACH procedure,
wherein a frequency domain resource assignment field in a downlink control information (DCI) format 1_0 used to trigger the ordered 2-step RACH procedure is used to indicate a frequency domain resource allocation of a MsgA physical uplink shared channel (PUSCH) transmission associated with the PRACH for the 2-step RACH procedure, and a remaining resource configuration for the MsgA PUSCH transmission including a time domain resource allocation is indicated by one or more reserved bits in the DCI format 1_0;
transmitting, by the BS, a PDCCH signal to a user equipment (UE), wherein the PDCCH signal includes an indication of the PDCCH ordered 2-step RACH procedure; and
receiving, by the BS, a first step of the 2-step RACH procedure, wherein the first step includes a PRACH preamble and an associated MsgA PUSCH from the UE.