US 12,445,174 B2
Methods, UE and APU for handling data transmissions in a distributed MIMO system
Pål Frenger, Linköping (SE); Erik G. Larsson, Linköping (SE); Emil Björnson, Hägersten (SE); and Martin Hessler, Linköping (SE)
Assigned to Telefonaktiebolaget LM Ericsson (Publ), Stockholm (SE)
Appl. No. 17/766,765
Filed by Telefonaktiebolaget LM Ericsson (PUBL), Stockholm (SE)
PCT Filed Oct. 8, 2019, PCT No. PCT/SE2019/050981
§ 371(c)(1), (2) Date Apr. 6, 2022,
PCT Pub. No. WO2021/071398, PCT Pub. Date Apr. 15, 2021.
Prior Publication US 2023/0318667 A1, Oct. 5, 2023
Int. Cl. H04B 7/0456 (2017.01); H04L 5/00 (2006.01)
CPC H04B 7/0456 (2013.01) [H04L 5/0048 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method performed by an Antenna Processing Unit, APU for handling data transmissions in a distributed massive Multiple Input Multiple Output, MIMO, communication system, wherein the APU is comprised in one of at least two non-co-located groups of APUs in the system, the method comprising:
determining a first pre-coding configuration and a Downlink, DL, reference signal;
transmitting, to a User Equipment, UE, the DL reference signal pre-coded with the first pre-coding configuration;
receiving information indicating a value of at least one phase adjustment parameter from the UE;
determining a second pre-coding configuration based on the first precoding configuration adjusted with the at least one phase adjustment parameter;
transmitting data pre-coded with the second pre-coding configuration to the UE; and
each of the at least two non-co-located groups of APUs being comprised in a respective radio stripe or cable.