METHOD FOR PROVIDING FEEDBACK OF CHANNEL STATE INFORMATION IN WIRELESS COMMUNICATION SYSTEM AND APPARATUS FOR SAME
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Abstract
Disclosed is a wireless communication system. A method for transmitting channel state information (CSI) in a wireless communication system includes receiving information about reference CSI configuration and following CSI configuration configured to have the same rank indicator (RI) as RI of the reference CSI configuration, determining a wideband precoding matrix index (PMI) according to the following CSI configuration to be the same as a wideband PMI according to the reference CSI configuration when reports of the wideband PMI and the RI according to the reference CSI configuration and reports of the wideband PMI and the RI according to the following CSI configuration collide in one subframe, and transmitting the RI and the wideband PMI according to any one selected from the reference CSI configuration and the following CSI configuration.
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Citations
28 Claims
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1-14. -14. (canceled)
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15. A method for transmitting Channel State Information (CSI) in a wireless access system, the method performed by a user equipment and comprising:
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providing a first report for a first CSI process and a second report for a second CSI process, wherein the first report and the second report are type 5 report which reports a Rank Indicator (RI) and a wideband Precoding Matrix Indicator (PMI); dropping the second report of the second CSI process having a higher CSI process index than the first CSI process in case of collision of the first report with the second report; and configuring a second wideband PMI of the second report same as a first wideband PMI of the first report, wherein a second RI of the second report is configured same as a first RI of the first report. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A method for receiving Channel State Information (CSI) in a wireless access system, the method performed by a base station and comprising:
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receiving a first report for a first CSI process and a second report for a second CSI process, wherein the first report and the second report are type 5 report which reports a Rank Indicator (RI) and a wideband Precoding Matrix Indicator (PMI); and receiving the first report of the first CSI process having a lower CSI process index than the second CSI process in case of collision of the first report with the second report, wherein a second RI of the second report is configured same as a first RI of the first report, and wherein a second wideband PMI of the second report is configured same as a first wideband PMI of the first report. - View Dependent Claims (22, 23, 24, 25, 26)
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27. A user equipment for transmitting Channel State Information (CSI) in a wireless access system, the user equipment comprising:
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a radio frequency (RF) unit; and a processor configured to; provide a first report for a first CSI process and a second report for a second CSI process, wherein the first report and the second report are type 5 report which reports a Rank Indicator (RI) and a wideband Precoding Matrix Indicator (PMI); drop the second report of the second CSI process having a higher CSI process index than the first CSI process in case of collision of the first report with the second report; and configure a second wideband PMI of the second report same as a first wideband PMI of the first report, wherein a second RI of the second report is configured same as a first RI of the first report.
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28. A base station for receiving Channel State Information (CSI) in a wireless access system, the base station comprising:
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a radio frequency (RF) unit; and a processor configured to; receive a first report for a first CSI process and a second report for a second CSI process, wherein the first report and the second report are type 5 report which reports a Rank Indicator (RI) and a wideband Precoding Matrix Indicator (PMI); and receive the first report of the first CSI process having a lower CSI process index than the second CSI process in case of collision of the first report with the second report, wherein a second RI of the second report is configured same as a first RI of the first report, and wherein a second wideband PMI of the second report is configured same as a first wideband PMI of the first report.
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Specification