METHOD AND APPARATUS FOR EFFICIENT FEEDBACK IN A WIRELESS COMMUNICATION SYSTEM SUPPORTING MULTIPLE ANTENNA
First Claim
1. A method for transmitting channel status information (CSI) of downlink transmission via uplink in a wireless communication system, the method comprising:
- transmitting a rank indicator (RI) at a first subframe; and
transmitting a first precoding matrix indicator (PMI), a second PMI, and a wideband (WB) channel quality indicator (CQI) at a second subframe,wherein a user equipment (UE) preferred precoding matrix is indicated by a combination of the first PMI and the second PMI, anda subsampled codebook for each precoding codebook of ranks from Rank-1 to Rank-4 is applied to the first PMI and the second PMI, and a sum of the first PMI and the second PMI for each of Rank-1 to Rank-4 is comprised of 4 bits.
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Accused Products
Abstract
A method and apparatus for transmitting effective channel status information (CSI) in a wireless communication system supporting multiple carriers are disclosed. A method for transmitting CSI of DL transmission via uplink in a wireless communication system includes transmitting a rank indicator (RI) at a first subframe, and transmitting a first precoding matrix indicator (PMI), a second PMI, and a wideband (WB) channel quality indicator (CQI) at a second subframe. UE preferred precoding matrix is indicated by a combination of the first PMI and the second PMI. A subsampled codebook for each precoding codebook of ranks from Rank-1 to Rank-4 is applied to the first PMI and the second PMI, and a sum of the first PMI and the second PMI for each of Rank-1 to Rank-4 is comprised of 4 bits.
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Citations
22 Claims
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1. A method for transmitting channel status information (CSI) of downlink transmission via uplink in a wireless communication system, the method comprising:
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transmitting a rank indicator (RI) at a first subframe; and transmitting a first precoding matrix indicator (PMI), a second PMI, and a wideband (WB) channel quality indicator (CQI) at a second subframe, wherein a user equipment (UE) preferred precoding matrix is indicated by a combination of the first PMI and the second PMI, and a subsampled codebook for each precoding codebook of ranks from Rank-1 to Rank-4 is applied to the first PMI and the second PMI, and a sum of the first PMI and the second PMI for each of Rank-1 to Rank-4 is comprised of 4 bits. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for receiving channel status information (CSI) of downlink transmission via uplink in a wireless communication system, the method comprising:
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receiving a rank indicator (RI) at a first subframe; and receiving a first precoding matrix indicator (PMI), a second PMI, and a wideband (WB) channel quality indicator (CQI) at a second subframe, wherein a user equipment (UE) preferred precoding matrix is indicated by a combination of the first PMI and the second PMI, and a subsampled codebook for each precoding codebook of ranks from Rank-1 to Rank-4 is applied to the first PMI and the second PMI, and a sum of the first PMI and the second PMI for each of Rank-1 to Rank-4 is comprised of 4 bits. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A user equipment (UE) for transmitting channel status information (CSI) of downlink transmission via uplink in a wireless communication system comprising:
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a reception module for receiving a downlink signal from a base station (BS); a transmission module for transmitting an uplink signal to the base station (BS); and a processor for controlling the user equipment (UE) including the reception module and the transmission module, wherein the processor, through the transmission module, transmits a rank indicator (RI) at a first subframe, and transmits a first precoding matrix indicator (PMI), a second PMI, and a wideband (WB) channel quality indicator (CQI) at a second subframe, a UE preferred precoding matrix is indicated by a combination of the first PMI and the second PMI, and a subsampled codebook for each precoding codebook of ranks from Rank-1 to Rank-4 is applied to the first PMI and the second PMI, and a sum of the first PMI and the second PMI for each of Rank-1 to Rank-4 is comprised of 4 bits.
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22. A base station (BS) for receiving channel status information (CSI) of downlink transmission via uplink in a wireless communication system comprising:
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a reception module for receiving an uplink signal from a user equipment (UE); a transmission module for transmitting a downlink signal to the user equipment (UE); and a processor for controlling the base station (BS) including the reception module and the transmission module, wherein the processor, through the reception module, receives a rank indicator (RI) at a first subframe, and receives a first precoding matrix indicator (PMI), a second PMI, and a wideband (WB) channel quality indicator (CQI) at a second subframe, a UE preferred precoding matrix is indicated by a combination of the first PMI and the second PMI, and a subsampled codebook for each precoding codebook of ranks from Rank-1 to Rank-4 is applied to the first PMI and the second PMI, and a sum of the first PMI and the second PMI for each of Rank-1 to Rank-4 is comprised of 4 bits.
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Specification