Channel status information feedback method and apparatus in wireless communication system with relay station

摘要

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.

主权项

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, 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.