Method and user equipment for transmitting precoding matrix information, and method and base station for configuring precoding matrix
AssigneeLG Electronics Inc.
InventorsMoon Il LEE, Jae Hoon CHUNG, Hyun Soo KO, Seung Hee HAN
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Abstract
An apparatus and method for a precoding matrix are disclosed. A codebook used for selecting a precoding matrix is comprised of m subgroups each including n precoding matrices. A user equipment indicates a specific precoding matrix selected from the codebook by transmitting to a base station a first codebook index indicating one of the m subgroups and a second codebook index indicating one of n precoding matrices in a subgroup. The base station configures the specific precoding matrix from the codebook based on the first and second codebook indexes.
Claims16
A method for transmitting precoding matrix information by a user equipment to a base station in a wireless communication system, comprising:
- receiving a reference signal from the base station;
- selecting a precoding matrix for the user equipment from a predefined codebook, using the reference signal;
- and
- transmitting first and second codebook indexes indicating the selected precoding matrix to the base station,
- wherein the first codebook index corresponds to a subgroup to which the selected precoding matrix belongs, among m subgroups each including n precoding matrices included in the predefined codebook, and the second codebook index corresponds to the selected precoding matrix among n precoding matrices in the subgroup to which the selected precoding matrix belongs.
A method for configuring a precoding matrix by a base station in a wireless communication system, comprising:
- receiving first and second codebook indexes from a user equipment;
- and
- configuring a precoding matrix for the user equipment from a predefined codebook based on the first and second codebook indexes,
- wherein the first codebook index corresponds to a subgroup to which the precoding matrix belongs, among m subgroups each including n precoding matrices included in the predefined codebook, and the second codebook index corresponds to the precoding matrix among n precoding matrices in the subgroup to which the precoding matrix belongs.
A user equipment for transmitting precoding matrix information to a base station in a wireless communication system, comprising:
- a transmitter;
- and
- a processor, operatively coupled to the transmitter, configured to control the transmitter,
- wherein the processor is configured to select a precoding matrix for the user equipment from a predefined codebook, using a reference signal received from the base station, and to control the transmitter to transmit first and second codebook indexes indicating the selected precoding matrix to the base station, and
- wherein the first codebook index corresponds to a subgroup to which the selected precoding matrix belongs, among m subgroups each including n precoding matrices included in the predefined codebook, and the second codebook index corresponds to the selected precoding matrix among n precoding matrices in the subgroup to which the selected precoding matrix belongs.
A base station for configuring a precoder in a wireless communication system, comprising:
- a receiver;
- and
- a processor, operatively coupled to the receiver, configured to control the receiver,
- wherein the processor is configured to select a precoding matrix for a user equipment from a predefined codebook based on first and second codebook indexes received from the user equipment and to control the receiver to configure a precoder for the user equipment according to the selected precoding matrix, and
- wherein the first codebook index corresponds to a subgroup to which the precoding matrix belongs, among m subgroups each including n precoding matrices included in the predefined codebook, and the second codebook index corresponds to the precoding matrix among n precoding matrices in the subgroup to which the precoding matrix belongs.
Dependencies are inferred from the claim text.