US 12,250,081 B2
Hybrid automatic repeat request (HARQ) mechanism for multicast in NR
Erik Stare, Sollentuna (SE); Jose Angel Leon Calvo, Aachen (DE); Jörg Huschke, Aachen (DE); Stefan Parkvall, Bromma (SE); Ratheesh Kumar Mungara, Sundbyberg (SE); and Mats Folke, Vällingby (SE)
Assigned to Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Appl. No. 17/784,779
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Dec. 18, 2020, PCT No. PCT/SE2020/051237
§ 371(c)(1), (2) Date Jun. 13, 2022,
PCT Pub. No. WO2021/133238, PCT Pub. Date Jul. 1, 2021.
Claims priority of provisional application 62/953,254, filed on Dec. 24, 2019.
Prior Publication US 2023/0019024 A1, Jan. 19, 2023
Int. Cl. H04L 1/1812 (2023.01); H04W 72/1273 (2023.01); H04W 72/23 (2023.01); H04W 72/30 (2023.01)
CPC H04L 1/1812 (2013.01) [H04W 72/1273 (2013.01); H04W 72/23 (2023.01); H04W 72/30 (2023.01)] 22 Claims
OG exemplary drawing
 
1. A method, performed by a user equipment (UE), for hybrid ARQ (HARQ) feedback in relation to multicast transmissions by a network node in a radio access network (RAN), the method comprising:
receiving, from the network node, first downlink control information (DCI) scheduling a first multicast transmission by the network node;
determining a HARQ feedback mode for the first multicast transmission by the network node, based on one or more of the following: the first DCI, and a radio resource control (RRC) message received from the network node before the first DCI;
based on the first DCI, attempting to decode the first multicast transmission by the network node; and
based on the determined HARQ feedback mode and on whether the attempt to decode is successful or unsuccessful, selectively transmitting to the network node HARQ feedback related to the first multicast transmission by the network node.