Patent ID: 11949479
Assignee: NOKIA TECHNOLOGIES OY
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 16:
17. A computer program product comprising a non-transitory computer-readable medium storing computer program code thereon which when executed by a device causes the device to perform at least:
sending from a base station codebook based sweeping information to at least one user equipment;
receiving, by the base station, precoding index reports from said at least one user equipment, the precoding index reports comprising an index of a best precoder selected by the at least one user equipment in accordance with said codebook-based training information;
grouping, by the base station using at least the precoding index reports, said at least one user equipment into at least one group of multiple groups, wherein grouping comprises:
grouping user equipments with a same precoding index into one group of the multiple groups;
obtaining a set of precoding indexes of the multiple groups;
selecting at least two groups of the multiple groups to be aggregated based on a total number of indexes in the set being larger than a target number and based on distance between the at least two groups of the multiple groups, wherein the distance is based on a number of precoders of a codebook; and
aggregating said at least two groups into a single group;

sending, by the base station to the at least one group that comprises the single group, beamformed channel state information reference signals in accordance with said at least one group; and;
receiving, by the base station, channel state information reports from said at least one user equipment of said at least one group, so as to transfer data to said at least one user equipment of said at least one group accordingly.