US 11,706,820 B2
User equipment, network node and methods therein for handling a two-step random access procedure in a wireless communications network
Min Wang, Luleå (SE); and Jan Christoffersson, Luleå (SE)
Assigned to Telefonaktiebolaget LM Ericsson (Publ), Stockholm (SE)
Appl. No. 17/268,734
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Sep. 6, 2019, PCT No. PCT/SE2019/050839
§ 371(c)(1), (2) Date Feb. 16, 2021,
PCT Pub. No. WO2020/060466, PCT Pub. Date Mar. 26, 2021.
Claims priority of provisional application 62/732,045, filed on Sep. 17, 2018.
Prior Publication US 2021/0307082 A1, Sep. 30, 2021
Int. Cl. H04W 74/08 (2009.01); H04W 72/0453 (2023.01); H04W 72/1263 (2023.01); H04W 72/23 (2023.01); H04L 1/1812 (2023.01); H04L 1/00 (2006.01); H04W 74/00 (2009.01)
CPC H04W 74/0841 (2013.01) [H04L 1/0003 (2013.01); H04L 1/1819 (2013.01); H04W 72/0453 (2013.01); H04W 72/1263 (2013.01); H04W 72/23 (2023.01); H04W 74/008 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method, performed by a user equipment, UE, for handling a two-step Random Access Channel, RACH, procedure, in a wireless communications network, the method comprising:
obtaining a Physical Uplink Shared Channel, PUSCH, resource table comprising a plurality of PUSCH resources, each PUSCH resource out of the plurality of PUSCH resources corresponds to a preamble assigned for the two-step RACH procedure, obtaining the PUSCH resource table comprises receiving a Physical Downlink Control Channel, PDCCH, order and a Radio Resource Control, RRC, signaling comprising the PUSCH resource table from the network node;
when a Random Access, RA, event is triggered:
obtaining a Physical Random Access Channel, PRACH, preamble corresponding to the RA event and a desired grant size, by randomly selecting a preamble mapping to an entry of the PUSCH resource table, providing a required size of a PUSCH resource for the triggered RA event, the preamble being selected from a group of preambles corresponding to the RA event; and
obtaining a grant from the PUSCH resource table based on the obtained PRACH preamble, which grant comprises an indication of a PUSCH resource to use for a Msg 3 transmission in Uplink, UL, in the table, each PUSCH resource entry in the table being associated with the following characteristics:
indices for Bandwidth Parts (BWPs); and
a time period that the grant is valid since the PUSCH transmission starts.