Patent ID: 11901995
Assignee: COMMSCOPE TECHNOLOGIES LLC
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 16:
17. A method of determining a composite precoder for transmitting to user equipment (UE) using a group of one or more of radio units of a radio access system, the radio access system comprising a distributed unit and a plurality of radio units to wirelessly transmit and receive radio frequency signals to and from the UE using a wireless interface, each of the radio units associated with a respective set of antennas and wherein the distributed unit is communicatively coupled to the plurality of radio units, the method comprising:
for each of a plurality of subsets of the radio units, transmitting separate reference signals from the different antennas of only the radio units included in that subset;
receiving subset-specific preferred precoder index reports from the UE for at least each subset that includes one or more radio units included in the group;
determining the composite precoder for the UE using at least some of the subset-specific preferred precoder index reports received from the UE; and
using the composite precoder for transmitting to the UE using the one or more radio units included in the group; and
wherein each of the subsets includes less than all of the radio units.