US 11,706,819 B2
Method and apparatus for supporting two-step random access channel usage in a wireless communication system
Gustav Gerald Vos, Surrey (CA); Recep Serkan Dost, Richmond (CA); and Steven John Bennett, Coquitlam (CA)
Assigned to SEMTECH CORPORATION, Camarillo, CA (US)
Filed by SEMTECH CORPORATION, Camarillo, CA (US)
Filed on Jun. 16, 2022, as Appl. No. 17/842,558.
Application 17/842,558 is a continuation of application No. 16/791,956, filed on Feb. 14, 2020, granted, now 11,395,343.
Claims priority of provisional application 62/805,581, filed on Feb. 14, 2019.
Prior Publication US 2022/0312497 A1, Sep. 29, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 74/08 (2009.01); H04L 1/1829 (2023.01); H04L 5/00 (2006.01)
CPC H04W 74/0833 (2013.01) [H04L 1/1861 (2013.01); H04L 5/0048 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A method for channel estimation by a radio access network (RAN) infrastructure node, the method comprising:
receiving, as part of a two-step random access channel (RACH) access procedure, a combination of a message 1 plus a message 3 from a UE; and
estimating channel conditions using characteristics of the message 1;
wherein the message 1 includes a physical RACH (PRACH) preamble in a PRACH slot within a first time range spanning a first frequency range, the PRACH preamble selected from a set of PRACH preambles;
wherein the message 3 is a physical uplink shared channel (PUSCH) message in one or more PUSCH slots within a second time range spanning a second frequency, the PUSCH message including a demodulation reference signal (DMRS) symbol pattern selected from a set of DMRS symbol patterns;
wherein one or more of the first frequency range, the first time range, the second time range and the second frequency range are signaled in a parameter set; and
wherein the parameter set includes one or more of PRACH preamble sequences, PRACH formats, power offset, a receive target power of the PRACH preamble and a power ramp step for PRACH preambles.