Method for transmitting and receiving data in wireless access system and apparatus for same
Disclosed are a method for transmitting and receiving data in a wireless access system supporting relay nodes, and an apparatus for same. In particular, the present invention comprises the steps of: sending a request for a retransmission to an adjacent second terminal, in case the recovery of data from a first signal received from a base station fails due to interference by the second terminal adjacent to a first terminal; the first terminal receiving a second signal from the second terminal; and the first terminal recovering data from the first signal, using the second signal, wherein the base station schedules a terminal other than the first and second terminals at the point of transmitting the second signal.
1. A method for receiving data in a wireless access system, the method comprising:
when a first user equipment fails to recover data from a first signal being received from a first base station due to an interference caused by a second signal being transmitted from a second base station to a second user equipment, requesting, by the first user equipment, retransmission to the second user equipment, wherein the second user equipment is neighboring the first user equipment and is connected to the second base station neighboring the first base station;
receiving, by the first user equipment, the second signal from the second user equipment;
receiving, by the first user equipment, a third signal from the second user equipment, wherein the third signal is the first signal being gained by the second user equipment;
recovering, by the first user equipment, first recovered data from the first signal by using the second signal;
recovering, by the first user equipment, second recovered data from the first signal by using the third signal; and
selecting one of the first and second recovered data which maximizes a target transmission rate,
wherein a plurality of user equipment other than the first user equipment and the second user equipment are scheduled by the first base station and the second base station at a time point when the second signal and the third signal are transmitted.
2. The method of claim 1 , wherein the first recovered data is recovered by subtracting an interference element from the first signal by using the second signal corresponding to the interference element of the first signal.
3. The method of claim 1 , wherein the second recovered data is recovered by combining the first signal and the third signal.
4. The method of claim 1 , wherein, when each of the first user equipment and the second user equipment is positioned in an area located at a distance equal to or greater than a threshold value from the first base station and the second base station, respectively, the plurality of user equipment other than the first user equipment and the second user equipment are positioned in areas each located at a distance lower than the threshold value from each of the first and second base stations.
5. A first user equipment that receives data in a wireless access system, the first user equipment comprising:
an RF (Radio Frequency) unit that transmits and receives radio signals; and
a processor that:
requests for retransmission to a second user equipment, when the first user equipment fails to recover data from a first signal being received from a first base station due to an interference caused by a second signal being transmitted from a second base station to the second user equipment, wherein the second user equipment is neighboring the first user equipment and is connected to the second base station neighboring the first base station,
a receives the second signal from the second user equipment,
receives a third signal from the second user equipment, wherein the third signal is the first signal being gained by the second user equipment,
recovers first recovered data from the first signal by using the second signal,
recovers second recovered data from the first signal by using the third signal, and
selects one of the first and second recovered data which maximizes a target transmission rate,
wherein a plurality of user equipment other than the first user equipment and the second user equipment are scheduled by the first base station and the second base station at a time point when the second signal and the third signal are transmitted.
6. The user equipment of claim 5 , wherein the first recovered data is recovered by subtracting an interference element from the first signal by using the second signal, corresponding to the interference element of the first signal.
7. The user equipment of claim 5 , wherein the second recovered data is recovered by combining the first signal and the third signal.
8. The user equipment of claim 5 , wherein, when each of the first user equipment and the second user equipment Drell is positioned in an area located at a distance equal to or greater than a threshold value from the first base station and the second base station, respectively, the plurality of user equipment other than the first user equipment and the second user equipment are positioned in areas each located at a distance lower than the threshold value from each of the first and second base stations.