Channel status information feedback method and apparatus in wireless communication system with relay station
First Claim
1. A method for transmitting channel status information at a relay node, the method comprising:
- receiving, by the relay node from a base station, a Backhaul downlink signal including a pilot signal;
performing, by the relay node, a channel estimation for a Backhaul downlink channel based upon the pilot signal included in the Backhaul downlink signal;
generating, by the relay node, channel status information based upon the channel estimation,wherein the channel status information includes at least one of rank information, precoding information, or channel quality information; and
transmitting, by the relay node, the channel status information through a Backhaul uplink subframe,wherein the Backhaul uplink subframe through which the channel status information is transmitted is decided based upon a subframe index to which a Backhaul downlink subframe is not designated and a Backhaul uplink transmission timing relation,wherein the channel status information is periodically transmitted from a channel status information periodic transmission starting point, andwherein the Backhaul uplink transmission timing relation corresponds to at least one of a timing relation between a Backhaul uplink grant and a Backhaul uplink data transmission or a timing relation between the Backhaul uplink data transmission and a Backhaul downlink acknowledgement response.
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Abstract
The present invention relates to a wireless communication system, and more particularly, to a channel status information feedback method and apparatus in a wireless communication system with a relay station. The method for transmitting channel status information according to one embodiment of the present invention comprises: receiving a backhaul downlink signal from a base station; generating channel status information based on the backhaul downlink signal; and transmitting the channel status information via a backhaul uplink subframe, wherein the backhaul uplink subframe to which the channel status information is transmitted can be determined based on a subframe index without a designated backhaul downlink subframe and a backhaul uplink transmission timing relation.
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Citations
12 Claims
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1. A method for transmitting channel status information at a relay node, the method comprising:
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receiving, by the relay node from a base station, a Backhaul downlink signal including a pilot signal; performing, by the relay node, a channel estimation for a Backhaul downlink channel based upon the pilot signal included in the Backhaul downlink signal; generating, by the relay node, channel status information based upon the channel estimation, wherein the channel status information includes at least one of rank information, precoding information, or channel quality information; and transmitting, by the relay node, the channel status information through a Backhaul uplink subframe, wherein the Backhaul uplink subframe through which the channel status information is transmitted is decided based upon a subframe index to which a Backhaul downlink subframe is not designated and a Backhaul uplink transmission timing relation, wherein the channel status information is periodically transmitted from a channel status information periodic transmission starting point, and wherein the Backhaul uplink transmission timing relation corresponds to at least one of a timing relation between a Backhaul uplink grant and a Backhaul uplink data transmission or a timing relation between the Backhaul uplink data transmission and a Backhaul downlink acknowledgement response. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A relay node configured to transmit channel status information and comprising:
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a receiving circuit configured to receive a Backhaul downlink signal from a base station and to receive an Access uplink signal from a user equipment; a transmitting circuit configured to transmit a Backhaul uplink signal to the base station and to transmit an Access downlink signal to the user equipment; and a processor configured to control the receiving circuit and the transmitting circuit, wherein the Backhaul downlink signal includes a pilot signal, wherein the processor is configured to; perform a channel estimation for a Backhaul downlink channel based upon the pilot signal included in the Backhaul downlink signal, generate channel status information based upon the channel estimation, wherein the channel status information includes at least one of rank information, precoding information, or channel quality information, and transmit the channel status information through a Backhaul uplink subframe through the transmitting circuit, and wherein a Backhaul uplink subframe through which the channel status information is transmitted is decided based upon a timing relation between a subframe index to which a Backhaul downlink subframe is not designated and Backhaul uplink transmission, wherein the channel status information is periodically transmitted from a channel status information periodic transmission starting point, and wherein the Backhaul uplink transmission timing relation corresponds to at least one of a timing relation between a Backhaul uplink grant and a Backhaul uplink data transmission or a timing relation between the Backhaul uplink data transmission and a Backhaul downlink acknowledgement response.
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Specification