Patent ID: 8897254

Claim:
An apparatus, comprising: a processor; and memory including computer program code; said memory and said computer program code configured to, with said processor, cause said apparatus to perform at least the following: measure channel state information on a downlink from a base station, identify a selected beam group out of a set of beam groups according to a wideband property of said channel state information, wherein a characteristic of said set of beam groups depends on a transmission rank, and identify a selected subset of beams in said selected beam group according to at least one subband, wherein a number of beams in said selected subset of beams is equal to said transmission rank; wherein an angular range from a direction of maximum array gain of a first beam to a direction of maximum array gain of a last beam in said selected beam group overlaps in angular domain with an angular range from a direction of maximum array gain of a first beam to a direction of maximum array gain of a last beam in an adjacent beam group.