US 12,302,401 B2
Apparatus, system and method for performing two-step RACH
Joseph M. Murray, Schwenksville, PA (US); Pascal M. Adjakple, Great Neck, NY (US); Lakshmi R. Iyer, King of Prussia, PA (US); Mohamed Awadin, Plymouth Meeting, PA (US); Patrick Svedman, Stockholm (SE); Qing Li, Princeton Junction, NJ (US); Allan Y. Tsai, Boonton, NJ (US); Yifan Li, Conshohocken, PA (US); Rocco Di Girolamo, Laval (CA); Zhuo Chen, Claymont, DE (US); and Guodong Zhang, Woodbury, NY (US)
Assigned to InterDigital Patent Holdings, Inc., Wilmington, DE (US)
Appl. No. 17/628,748
Filed by InterDigital Patent Holdings, Inc., Wilmington, DE (US)
PCT Filed Aug. 4, 2020, PCT No. PCT/US2020/044830
§ 371(c)(1), (2) Date Jan. 20, 2022,
PCT Pub. No. WO2021/026118, PCT Pub. Date Feb. 11, 2021.
Claims priority of provisional application 62/882,565, filed on Aug. 4, 2019.
Prior Publication US 2022/0272760 A1, Aug. 25, 2022
Int. Cl. H04W 74/0833 (2024.01); H04W 74/0836 (2024.01); H04W 36/00 (2009.01); H04W 36/08 (2009.01); H04W 74/08 (2009.01); H04W 74/0838 (2024.01)
CPC H04W 74/0833 (2013.01) [H04W 74/0836 (2024.01); H04W 36/085 (2023.05); H04W 36/13 (2023.05); H04W 74/08 (2013.01); H04W 74/0838 (2024.01)] 17 Claims
OG exemplary drawing
 
1. A wireless transmit/receive unit (WTRU) comprising:
a processor and memory, wherein the processor and memory are configured to:
trigger a Random Access Channel (RACH) procedure in response to beam failure detection for a Serving Cell;
select a two-step RACH procedure from among a plurality of RACH procedures as a RACH type to be performed;
receive a first threshold from a network;
select a MsgA transmission resource, wherein the selecting of the MsgA transmission resource comprises selecting a Synchronization Signal Block (SSB) with Synchronization Signal-Reference Signal Received Power (SS-RSRP) above the first threshold, wherein a first preamble group is selected if the SS-RSRP is above a second threshold, and a second preamble group is selected if the SS-RSRP is equal to or below the second threshold;
transmit a MsgA using the MsgA transmission resource, wherein the MsgA comprises a Cell Radio-Network Temporary Identifier (C-RNTI) Media Access Control (MAC) Control Element (CE) and an indication of a selected candidate beam; and
monitor for a network response from a network for a network response addressed to the C-RNTI.