Codebook for full-dimension multiple input multiple output communications
AssigneeApple Inc.
InventorsYuan Zhu, Qinghua Li, Xiaogang Chen, Jong-Kae Fwu
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Abstract
Various embodiments include an apparatus to be employed by an enhanced Node B (eNB), the apparatus comprising communication circuitry to receive, from a user equipment (UE), feedback information and control circuitry, coupled with the communication circuitry, to identify a codeword from a three-dimensional codebook based on the feedback information received from the UE, wherein the communication circuitry is further to precode data to be transmitted to the UE based on the codeword. An apparatus to be employed by a UE and additional methods are described.
Claims22
A method performed by a user equipment (UE) in a communications network, the method comprising:
- receiving, from a base station, a channel state information reference signal (CSI-RS) corresponding to a plurality of communication channels associated with the base station;
- measuring, based on the CSI-RS, a plurality of channel state information (CSI) corresponding to the plurality of communications channels associated with the base station;
- upon measuring the plurality of CSI, selecting a precoding matrix from a multi-dimensional codebook that includes a plurality of codewords indicated by a corresponding plurality of precoding matrices, the precoding matrix selected for communications between the base station and the UE,
- wherein a codeword of the plurality of codewords in the codebook is based on a plurality of matrices that includes a first matrix, a second matrix and a third matrix,
- wherein the precoding matrix comprises a first element determined using a first index applied to the first matrix, a second element determined using a second index applied to the second matrix, and a third element determined using the third matrix, wherein each of the first element, second element and third element is a matrix;
- generating a feedback report for the base station, the feedback report including information about the selected precoding matrix and further including at least one of a rank indicator (RI) or a channel quality indicator (CQI);
- and
- transmitting the feedback report to the base station.
One or more non-transitory computer-readable media storing instructions that, when executed by one or more processors, cause a user equipment (UE) in a communications network to perform operations comprising:
- receiving, from a base station, a channel state information reference signal (CSI-RS) corresponding to a plurality of communication channels associated with the base station;
- measuring, based on the CSI-RS, a plurality of channel state information (CSI) corresponding to the a plurality of communications channels associated with the base station;
- upon measuring the plurality of CSI, selecting a precoding matrix from a multi-dimensional codebook that includes a plurality of codewords indicated by a corresponding plurality of precoding matrices, the precoding matrix selected for communications between the base station and the UE,
- wherein a codeword of the plurality of codewords in the codebook is based on a plurality of matrices that includes a first matrix, a second matrix and a third matrix,
- wherein the precoding matrix comprises a first element determined using a first index applied to the first matrix, a second element determined using a second index applied to the second matrix, and a third element determined using the third matrix, wherein each of the first element, second element and third element is a matrix;
- generating a feedback report for the base station, the feedback report including information about the selected precoding matrix and further including at least one of a rank indicator (RI) or a channel quality indicator (CQI);
- and
- transmitting the feedback report to the base station.
A processor for a user equipment (UE) in a communications network, the processor comprising circuitry to perform operations comprising:
- receiving, from a base station, a channel state information reference signal (CSI-RS) corresponding to a plurality of communication channels associated with the base station;
- measuring, based on the CSI-RS, a plurality of channel state information (CSI) corresponding to the plurality of communications channels associated with the base station;
- upon measuring the plurality of CSI, selecting a precoding matrix from a multi-dimensional codebook that includes a plurality of codewords indicated by a corresponding plurality of precoding matrices, the precoding matrix selected for communications between the base station and the UE,
- wherein a codeword of the plurality of codewords in the codebook is based on a plurality of matrices that includes a first matrix, a second matrix and a third matrix,
- wherein the precoding matrix comprises a first element determined using a first index applied to the first matrix, a second element determined using a second index applied to the second matrix, and a third element determined using the third matrix, wherein each of the first element, second element and third element is a matrix;
- generating a feedback report for the base station, the feedback report including information about the selected precoding matrix and further including at least one of a rank indicator (RI) or a channel quality indicator (CQI);
- and
- transmitting the feedback report to the base station.
Dependencies are inferred from the claim text.