Patent ID: 8923219

Claim:
A method for wireless communications, comprising: selecting, at a first apparatus, a subset of apparatuses from a plurality of apparatuses, wherein the subset is selected based at least on a metric associated with each apparatus of the plurality of apparatuses, wherein the metric comprises a rate of evolution of channel state information (CSI) of each of the plurality of apparatuses and wherein the metric is determined based at least on one of: a total number of apparatuses in the plurality of apparatuses, a modulation-coding scheme (MCS) associated with each of the plurality of apparatuses, or a transmit power associated with each of the plurality of apparatuses; transmitting a request for CSI and a training sequence to each apparatus in the subset; receiving, from each apparatus in the subset, CSI associated with that apparatus, wherein the CSI is determined in response to the request for CSI using the training sequence; and transmitting data to the plurality of apparatuses based at least on the CSI received from each apparatus in the subset.