Apparatus, method and computer program product for selecting beam group and subset of beams in communication system

摘要

An apparatus and method for selecting a beam group and a subset of beams in a communication system are disclosed. The method includes: measuring channel state information (CSI) on a downlink from a base station (920); identifying a selected beam group out of a set of beam groups according to a wideband property of the CSI (930); identifying a selected subset of beams in the selected beam group according to at least one subband (940). Wherein the characteristic of the set of beam groups depends on a transmission rank and the number of beams in the selected subset of beams is equal to the transmission rank. The method further includes: generating encoded feedback information identifying the selected beam group and the selected subset of beams for each subband in a double codebook format (950), transmitting the encoded feedback information to the base station. A computer program product comprising the computer program code which is configured to cause the apparatus to implement above operations is also disclosed.

主权项

1. 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, andidentify 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.