Data relay method and device in communication system

An operation method of a relay (R) node in a communication system, the operation method comprising:

• receiving a reference signal from a first communication node;
• transmitting first feedback information for the reference signal to the first communication node;
• receiving first data from the first communication node;
• receiving third data from a second communication node;
• performing an XOR operation on the first data and the third data;
• and
• transmitting second data resulting from the XOR operation to the first communication node and the second communication node,
• wherein the R node is a candidate R node satisfying a condition that a first power value is equal to or less than a second power value, the first power value means a transmit power difference between the first communication node and the second communication node, and the second power value means a maximum received power difference in which a signal distortion does not occur due to a power imbalance between signals received by the candidate R node from the first communication node and the second communication node.

A first communication node in a communication system, the first communication node comprising:

• a processor;
• a memory electronically communicating with the processor;
• and
• instructions stored in the memory,
• wherein when executed by the processor, the instructions cause the first communication node to:
• transmit a reference signal to one or more candidate relay (R) nodes;
• receive first feedback information including a minimum value of a first reference signal received power (RSRP) from a first candidate R node belonging to the one or more candidate R nodes;
• receive second feedback information including a minimum value of a second RSRP from a second candidate R node belonging to the one or more candidate R nodes;
• compare a first value based on the first feedback information with a second value based on the second feedback information;
• select the first candidate R node as an R node to perform a relay operation when the first value is greater than the second value;
• and
• communicate with a second communication node through the R node,
• wherein the first candidate R node satisfies a condition that a first power value is equal to or less than a second power value, the first power value means a transmit power difference between the first communication node and the second communication node, and the second power value means a maximum received power difference in which a signal distortion does not occur due to a power imbalance between signals received by the first candidate R node from the first communication node and the second communication node.