Method and device for transmitting channel state information in a wireless communication system
AssigneeLG Electronics Inc.
InventorsHyungtae Kim, Hanbyul Seo, Daewon Lee
Life of this patent
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Abstract
The present invention relates to a wireless communication system. A method for a terminal to transmit channel state information (CSI) comprises the steps of: determining a precoding matrix by selecting a first precoding matrix and a second precoding matrix; and transmitting the CSI including an index of the said first precoding matrix and an index of the said second precoding matrix. The said first precoding matrix relates to a method for transmitting CSI in which a revision factor according to a relationship between the said terminal and a transmission point is applied.
Claims12
A method for transmitting channel state information (CSI) at a user equipment (UE) served by two or more transmission points (TPs) in a wireless communication system, the method comprising:
- determining a precoding matrix by selecting a first precoding matrix having a revision factor for revising a difference between channel states of the two or more TPs and a second precoding matrix;
- and
- transmitting the CSI including an index of the first precoding matrix and an index of the second precoding matrix.
A method for transmitting a downlink signal at a transmission point (TP) in a wireless communication system, the method comprising:
- determining a precoding matrix by selecting a first precoding matrix havig a revision factor for revising a difference between a channel state of the TP and a channel state of another TP performing cooperative transmission with the TP for a user equipment (UE) and a second precoding matrix;
- and
- precoding a downlink signal using the precoding matrix.
A user equipment (UE) served by two or more transmission points (TPs) in a wireless communication system, the UE comprising:
- a reception module;
- and
- a processor,
- wherein the processor is configured to:
- determine a precoding matrix by selecting a first precoding matrix having a revision factor for revising a difference between channel states of the two or more TPs and a second precoding matrix, and
- transmit channel state information (CSI) including an index of the first precoding matrix and an index of the second precoding matrix.
A transmission point (TP) in a wireless communication system, the TP comprising:
- a transmission module;
- and
- a processor,
- wherein the processor is configured to:
- determine a precoding matrix by selecting a first precoding matrix having a revision factor for revising a difference between a channel state of the TP and a channel state of another TP performing cooperative transmission with the TP for a user equipment (UE) and a second precoding matrix, and
- precode a downlink signal using the precoding matrix.
Dependencies are inferred from the claim text.