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

  • US 8,848,597 B2
  • Filed: 09/07/2010
  • Issued: 09/30/2014
  • Est. Priority Date: 09/07/2009
  • Status: Active Grant
First Claim
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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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