Method and apparatus for generating a channel state information report

A user equipment for generating a channel state information report having information corresponding to a set of layers, the user equipment comprising:

• a transceiver that receives a set of reference signals transmitted from a network including at least one base station;
• and
• a controller that identifies a set of beams based on the set of reference signals, obtains a pair of amplitude and phase coefficient vectors, which includes an amplitude coefficient vector and a phase coefficient vector, by transforming the received set of reference signals, wherein each pair of the amplitude and phase coefficient vectors corresponds to a beam in the set of beams in each layer of the set of layers, partitions the layers from the set of layers into a set of layer-groups, generates a beam bitmap vector for each layer-group indicating a subset corresponding to a selected set of beams within the layer-group, which excludes from the selected set of beams any beams having no non-zero coefficient values in the corresponding obtained amplitude coefficient vector, and generates a coefficient bitmap vector for each of the selected set of beams in each layer indicating particular coefficients of each of the respective beams from the selected set identified in the beam bitmap vector that have non-zero amplitude values;
• wherein the transceiver further transmits the channel state information report to the network, the channel state information report comprising at least the beam bitmap vector and the coefficient bitmap vector.