US 12,457,638 B2
Two-step random access
Jonas Sedin, Sollentuna (SE); Zhipeng Lin, Nanjing (CN); and Johan Rune, Lidingö (SE)
Assigned to Telefonaktiebolaget LM Ericsson (Publ), Stockholm (SE)
Appl. No. 17/793,756
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Jan. 19, 2021, PCT No. PCT/EP2021/051080
§ 371(c)(1), (2) Date Jul. 19, 2022,
PCT Pub. No. WO2021/148412, PCT Pub. Date Jul. 29, 2021.
Claims priority of application No. 20152765 (EP), filed on Jan. 20, 2020.
Prior Publication US 2023/0054655 A1, Feb. 23, 2023
Int. Cl. H04W 74/04 (2009.01); H04W 74/00 (2009.01); H04W 74/0833 (2024.01); H04W 74/0836 (2024.01); H04W 74/0838 (2024.01)
CPC H04W 74/04 (2013.01) [H04W 74/004 (2013.01); H04W 74/0836 (2024.01); H04W 74/0838 (2024.01); H04W 74/0833 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method implemented by a user equipment (UE) of performing two-step, contention-free random access, the method comprising:
receiving a partial Physical Uplink Shared Channel (PUSCH) resource configuration for a Message A (msgA) transmission including a dynamic part of the PUSCH resource configuration for the msgA transmission, the partial PUSCH resource configuration being less than a complete msgA PUSCH resource configuration, the dynamic part of the PUSCH resource configuration comprising a demodulation reference signal (DMRS) configuration;
transmitting, to a base station, the preamble of msgA; and
transmitting, to the base station, the PUSCH message of msgA using PUSCH resources indicated by the dynamic part of the PUSCH resource configuration.