METHOD AND APPARATUS FOR REPORTING CHANNEL STATE INFORMATION IN A WIRELESS COMMUNICATION SYSTEM
First Claim
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1. A method for reporting Channel State Information (CSI) in an uplink in a wireless communication system, the method comprising:
- reporting a first Precoding Matrix Indicator (PMI);
detecting that a Rank Indicator (RI) is changed before a second PMI is reported, the RI being changed within an RI group;
calculating the second PMI and a Channel Quality Indicator (CQI) using the first PMI; and
reporting the second PMI and the CQI.
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Abstract
A method and apparatus are provided for reporting Channel State Information (CSI) for operation of a network, when a Precoding Matrix Indicator (PMI) and a Channel Quality Indicator (CQI) cannot be calculated. The method includes reporting a first Precoding Matrix Indicator (PMI); detecting that a Rank Indicator (RI) is changed before a second PMI is reported, the RI being changed within an RI group; calculating the second PMI and a Channel Quality Indicator (CQI) using the first PMI; and reporting the second PMI and the CQI.
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Citations
18 Claims
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1. A method for reporting Channel State Information (CSI) in an uplink in a wireless communication system, the method comprising:
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reporting a first Precoding Matrix Indicator (PMI); detecting that a Rank Indicator (RI) is changed before a second PMI is reported, the RI being changed within an RI group; calculating the second PMI and a Channel Quality Indicator (CQI) using the first PMI; and reporting the second PMI and the CQI. - View Dependent Claims (2, 3)
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4. A method for reporting Channel State Information (CSI) in an uplink in a wireless communication system, the method comprising:
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reporting a first Precoding Matrix Indicator (PMI); detecting that a Rank Indicator (RI) is changed before a second PMI is reported; calculating the second PMI and a Channel Quality Indicator (CQI) based on a previous RI, which is reported before the RI is changed; and reporting the second PMI and the CQI. - View Dependent Claims (5)
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6. A method for reporting Channel State Information (CSI) in an uplink in a wireless communication system, the method comprising:
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reporting a first Precoding Matrix Indicator (PMI); detecting that a Rank Indicator (RI) is changed before a second PMI is reported; calculating the second PMI and a Channel Quality Indicator (CQI) using a first PMI which is predefined among a candidate first PMI set of a previous RI, which was reported before the RI is changed; and reporting the second PMI and the CQI. - View Dependent Claims (7)
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8. A method for reporting Channel State Information (CSI) in an uplink in a wireless communication system, the method comprising:
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reporting a first Precoding Matrix Indicator (PMI); detecting that a Rank Indicator (RI) is changed before a second PMI is reported; and not reporting the second PMI before the first PMI based on the changed RI is reported. - View Dependent Claims (9)
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10. A User Equipment (UE) for reporting Channel State Information (CSI) in an uplink in a wireless communication system, the UE comprising:
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a transmitter for transmitting to an evolved Node B (eNB) the CSI including at least one of a first Precoding Matrix Indicator (PMI), and second PMI and Channel Quality Indicator (CQI); and a controller for reporting to the eNB, the second PMI and CQI, which are calculated using the first PMI, if the RI is changed before the second PMI is reported, after the first PMI is reported, wherein the RI is changed within an RI group. - View Dependent Claims (11, 12)
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13. A User Equipment (UE) for reporting Channel State Information (CSI) in an uplink in a wireless communication system, the UE comprising:
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a transmitter for transmitting to an evolved Node B (eNB) the CSI including at least one of a first Precoding Matrix Indicator (PMI), and a second PMI and a Channel Quality Indicator (CQI); and a controller for reporting to the eNB, the second PMI and the CQI, which are calculated based on a previous Rank Indicator (RI), which is reported before an RI changes, if the RI is changed before the second PMI is reported, after the first PMI is reported. - View Dependent Claims (14, 16)
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15. A User Equipment (UE) for reporting Channel State Information (CSI) in an uplink in a wireless communication system, the UE comprising:
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a transmitter for transmitting to an evolved Node B (eNB) the CSI including at least one of a first Precoding Matrix Indicator (PMI), and a second PMI and a Channel Quality Indicator (CQI); and a controller for reporting to the eNB, the second PMI and the CQI, which are calculated using a first PMI, which is cyclically predefined among a candidate first PMI set of a previous Rank Indicator (RI), which is reported before the RI changes, if the RI changes before the second PMI is reported, after the first PMI is reported.
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17. A User Equipment (UE) for reporting Channel State Information (CSI) in an uplink in a wireless communication system, the UE comprising:
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a transmitter for transmitting to an evolved Node B (eNB) the CSI including at least one of a first Precoding Matrix Indicator (PMI), and a second PMI and a Channel Quality Indicator (CQI); and a controller for not reporting the second PMI before the first PMI based on a changed RI is reported, if the RI is changed before the second PMI is reported, after the first PMI is reported. - View Dependent Claims (18)
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Specification