Feedback Based on Codebook Subset
AssigneeApple Inc.
InventorsLai King Tee, Yi Song, Neng Wang
Life of this patent
Estimating the term…
Abstract
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.
Claims20
A method for operating a first communication station to facilitate communication between the first communication station and a remote communication station, wherein the first communication station includes a plurality of transmit antennas, the method comprising:
- determining a configuration of a plurality of codebook subsets of a codebook, wherein each codebook subset of the plurality of codebook subsets includes a set of codebook weighting matrices, and wherein the codebook weighting matrices define a beam-forming pattern for downlink transmissions;
- acquiring channel condition information about a channel condition between the first communication station and the remote communication station, wherein the channel condition information includes information regarding uplink transmissions that are received using a receive beam-forming pattern related to the beam-forming pattern for downlink transmissions;
- selecting, based on the channel condition information, a codebook subset from the plurality of codebook subsets of the codebook;
- selecting, from the selected codebook subset, an appropriate codebook weighting matrix for the remote communication station;
- applying the selected codebook weighting matrix to one or more layer signals to obtain transmit signals for the plurality of transmit antennas;
- and
- transmitting the transmit signals through the plurality of transmit antennas.
An apparatus for communication with a remote communication station, the apparatus comprising:
- a plurality of transmit antennas;
- and
- processor circuitry communicatively coupled to the plurality of transmit antennas, the processor circuitry configured to:
- determine a configuration of a plurality of codebook subsets of a codebook, wherein each codebook subset of the plurality of codebook subsets includes a set of codebook weighting matrices, and wherein the codebook weighting matrices define a beam-forming pattern for downlink transmissions;
- acquire channel condition information about a channel condition between the apparatus and the remote communication station, wherein the channel condition information includes information regarding uplink transmissions that are received using a receive beam-forming pattern related to the beam-forming pattern for downlink transmissions;
- select, based on the channel condition information, a codebook subset from the plurality of codebook subsets of the codebook;
- select, from the selected codebook subset, an appropriate codebook weighting matrix for the remote communication station;
- apply the selected codebook weighting matrix to one or more layer signals to obtain transmit signals for the plurality of transmit antennas;
- and
- transmit the transmit signals through the plurality of transmit antennas.
A non-transitory computer-readable memory medium storing program instructions that, when executed by a processor of a first communication station, cause the first communication station to:
- determine a configuration of a plurality of codebook subsets of a codebook, wherein each codebook subset of the plurality of codebook subsets includes a set of codebook weighting matrices, and wherein the codebook weighting matrices define a beam-forming pattern for downlink transmissions;
- acquire channel condition information about a channel condition between the first communication station and a remote communication station, wherein the channel condition information includes information regarding uplink transmissions that are received using a receive beam-forming pattern related to the beam-forming pattern for downlink transmissions;
- select, based on the channel condition information, a codebook subset from the plurality of codebook subsets of the codebook;
- select, from the selected codebook subset, an appropriate codebook weighting matrix for the remote communication station;
- apply the selected codebook weighting matrix to one or more layer signals to obtain transmit signals for a plurality of transmit antennas of the first communication station;
- and
- transmit the transmit signals through the plurality of transmit antennas.
Dependencies are inferred from the claim text.