Method and apparatus for supporting harq operation using harq channel identifier in wireless access system

A method for supporting a Hybrid Automatic Repeat Request (HARQ) operation of Machine-to-Machine (M2M) devices using a HARQ Channel Identifier (ACID) in a wireless access system, the method comprising:

• receiving, an M2M device, a UL A-MAP IE from a base station in a subframe in which a UL burst is to be retransmitted, the UL A-MAP IE including a second ACID and second resource allocation information indicating an allocated resource region;
• and
• retransmitting, at the M2M device, the UL burst using a first ACID in the subframe, if the second ACID is different from the first ACID of the UL burst to be retransmitted,
• wherein the M2M device shares a Station Identifier (STID) with other M2M devices.

A base station for supporting a Hybrid Automatic Repeat Request (HARQ) operation of Machine-to-Machine (M2M) devices using a HARQ Channel Identifier (ACID) in a wireless access system, the base station comprising:

• a transmitter;
• a receiver;
• and
• a processor for supporting the HARQ operation,
• wherein the base station is configured to:
• transmit a second UL A-MAP IE to M2M devices sharing a Station Identifier (STID) through the transmitter in a subframe in which a second M2M device is to retransmit a UL burst, the second UL A-MAP IE including a second ACID and resource allocation information for allocating a resource region to a first M2M device,
• receive the UL burst retransmitted using a first ACID from the second M2M device in the subframe through the receiver, and
• receive a new UL burst transmitted using the second ACID from the first M2M device in the subframe,
• wherein the first and second M2M devices share the STID, and the first and second ACIDs are different from each other.

A Machine-to-Machine (M2M) device for supporting a Hybrid Automatic Repeat Request (HARQ) operation using a HARQ Channel Identifier (ACID) in a wireless access system, the M2M device comprising:

• a transmitter;
• a receiver;
• and
• a processor for supporting the HARQ operation,
• wherein the M2M device is configured to:
• receive a UL A-MAP IE from a base station through the receiver in a subframe in which a UL burst is to be retransmitted, the UL A-MAP IE including a second ACID and resource allocation information indicating an allocated resource region, and
• retransmit the UL burst using the first ACID in the subframe through the transmitter, if the second ACID is different from a first ACID of the UL burst to be retransmitted,
• wherein the M2M device shares a Station Identifier (STID) with other M2M devices.