Feedback Based on Designated Subset of Codebook

摘要

The present invention provides for an improved application of signal strength weightings in a SDMA sectorized cellular network. The improved signal strength weightings application is conducted through the improved selection of weightings from a new codebook subset or by the selection of weightings from a larger codebook subset. In a further embodiment, an antenna beam index or bit map can be used to select the best beam(s) in a SDMA sectorized cellular network. In another embodiment, a field or factor in an uplink or downlink transmission packet can designate which directional transmission beam is best suited for the transmission or when the directional transmission beam should be activated.

主权项

1. A user equipment (UE) device for communication with a base station, the UE device comprising:
transmitting a codeword index to the base station, wherein the codeword index identifies a first codebook weighting matrix from within a designated subset of a codebook, wherein the codebook includes at least six codebook weighting matrices, wherein each of the codebook weighting matrices includes one or more layer-related columns, wherein each of the layer-related columns includes a plurality of complex weight values having absolute value less than or equal to one; receiving signals from a channel, wherein the signals have been generated by a precoding operation based on a particular codebook weighting matrix from the designated subset; recovering information from the received signals.