Method for avoiding inter-cell interference in a wireless access system

A method for avoiding Inter-Cell Interference (ICI) in a wireless access system, the method comprising:

• overhearing, by a Relay Node (RN) in an nth subframe, physical downlink control channels (PDCCHs) transmitted from a plurality of evolved Node Bs (eNBs), sharing the RN, to user equipments (UEs) within a coverage of each eNB, wherein each of the PDCCHs comprises an uplink (UL) grant;
• decoding, by the RN in an (n+1)th subframe to an (n+2)th subframe, the PDCCHs;
• reallocating, by the RN, resource regions allocated to the UEs for the PDCCHs if, as a result of the decoding, a collision has occurred between the resource regions;
• sending, by the RN, control information indicative of the reallocated resource region to each of the eNBs;
• overhearing, by the RN in an (n+4)th subframe, physical uplink shared channels (PUSCHs) transmitted from the UEs to the eNBs;
• decoding, by the RN, the PUSCHs;
• sending by the RN, a result of the decoding to each of the eNBs;
• overhearing, by the RN in an (n+8)th subframe, an updated PDCCH by taking a response to the PUSCHs transmitted by the eNBs and the reallocated resource regions into consideration, wherein the response to the PUSCHs transmitted by the eNBs is an acknowledgement (ACK) or a negative acknowledgement (NACK);
• sending, by the RN, to each of the eNBs, information indicating whether the updated PDCCH has been successfully overheard;
• and
• retransmitting, by the RN in an (n+12)th subframe, the PUSCH, transmitted in the (n+4)th subframe, to an eNB that has sent a NACK based on the updated PDCCH.