Method and apparatus for efficient feedback in a wireless communication system supporting multiple antenna
AssigneeLG Electronics Inc.
InventorsHyunsoo KO, Sunam KIM, Dongguk LIM, Moonil LEE, Jaehoon CHUNG
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Abstract
A method for transmitting channel status information (CSI) via uplink in a wireless communication system includes transmitting a first precoding matrix indicator (PMI) and a second PMI at a subframe. A subsampled codebook for each of a precoding codebook for Rank-1 and a precoding codebook for Rank-2 is determined based on at least the first PMI or the second PMI. In case of the Rank-1 or the Rank-2, a number of elements for the first PMI is 8.
Claims20
A method for transmitting channel status information (CSI) via a physical uplink control channel (PUCCH) by a user equipment (UE) in a wireless communication system, the method comprising:
- transmitting a first PUCCH report including a rank indicator (RI);
- and
- transmitting a second PUCCH report including a channel quality indicator (CQI), a first precoding matrix indicator (PMI) and a second PMI,
- wherein when the RI corresponds to one of Rank-1 to Rank-4, a sub set of a codebook corresponding to the RI is available for selecting the first PMI and the second PMI, and a sum of the first PMI and the second PMI is comprised of 4 bits, and
- wherein when the RI corresponds to one of Rank-5 to Rank-7, a full set of a codebook corresponding to the RI is available for selecting the first PMI and the second PMI, and a sum of the first PMI and the second PMI is comprised of 2 bits.
A method for receiving channel status information (CSI) via a physical uplink control channel (PUCCH) by a base station (BS) in a wireless communication system, the method comprising:
- receiving a first PUCCH report including a rank indicator (RI);
- and
- receiving a second PUCCH report including a channel quality indicator (CQI), a first precoding matrix indicator (PMI) and a second PMI,
- wherein when the RI corresponds to one of Rank-1 to Rank-4, a sub set of a codebook corresponding to the RI is applied to the first PMI and the second PMI, and a sum of the first PMI and the second PMI is comprised of 4 bits, and
- wherein when the RI corresponds to one of Rank-5 to Rank-7, a full set of a codebook corresponding to the RI is applied to the first PMI and the second PMI, and a sum of the first PMI and the second PMI is comprised of 2 bits.
A user equipment (UE) for transmitting channel status information (CSI) via a physical uplink control channel (PUCCH) in a wireless communication system, the UE comprising:
- a transmitter;
- and
- a processor controls the transmitter to transmit a first PUCCH report including a rank indicator (RI);
- and to transmit a second PUCCH report including a channel quality indicator (CQI), a first precoding matrix indicator (PMI) and a second PMI,
- wherein when the RI corresponds to one of Rank-1 to Rank-4, a sub set of a codebook corresponding to the RI is available for selecting the first PMI and the second PMI, and a sum of the first PMI and the second PMI is comprised of 4 bits, and
- wherein when the RI corresponds to one of Rank-5 to Rank-7, a full set of a codebook corresponding to the RI is available for selecting the first PMI and the second PMI, and a sum of the first PMI and the second PMI is comprised of 2 bits.
A base station (BS) for receiving channel status information (CSI) via a physical uplink control channel (PUCCH) in a wireless communication system, the BS comprising:
- a receiver;
- and
- a processor controls the receiver to receive a first PUCCH report including a rank indicator (RI) and to receive a second PUCCH report including a channel quality indicator (CQI), a first precoding matrix indicator (PMI) and a second PMI,
- wherein when the RI corresponds to one of Rank-1 to Rank-4, a sub set of a codebook corresponding to the RI is applied to the first PMI and the second PMI, and a sum of the first PMI and the second PMI is comprised of 4 bits, and
- wherein when the RI corresponds to one of Rank-5 to Rank-7, a full set of a codebook corresponding to the RI is applied to the first PMI and the second PMI, and a sum of the first PMI and the second PMI is comprised of 2 bits.
Dependencies are inferred from the claim text.