Method and apparatus for transmitting a MAC control message in wireless access system

A method for transmitting a Medium Access Control (MAC) control message for an M2M device in a wireless access system, the method comprising:

• broadcasting, by a base station, a broadcast assignment map information element (BA A-MAP IE) including a function index field and broadcast assignment information, wherein the function index field indicates that the BA A-MAP IE carries the broadcast assignment information for the M2M device and the broadcast assignment information indicates a resource region to which the MAC control message is being transmitted;
• and
• transmitting, by the base station, the MAC control message through the resource region which is indicated by the broadcast assignment information,
• wherein a cyclic redundancy check (CRC) bit masked to the BA A-MAP IE indicates that the BA A-MAP IE is for a M2M broadcast assignment,
• wherein the CRC bit being masked to the BA A-MAP IE is configured to a 1-bit masking prefix, a 3-bit type indicator, and a 12-bit masking code, and
• wherein the masking code is used to mask the BA A-MAP IE for the M2M broadcast assignment.

A M2M device for receiving a Medium Access Control (MAC) control message in a wireless access system, the M2M device comprising:

• a transmitter;
• a receiver;
• and
• a processor supporting a reception of the MAC control message,
• wherein the M2M device is configured to:
• receive a broadcast assignment map information element (BA A-MAP IE) including a function index field and broadcast assignment information by using the receiver, wherein the function index field indicates that the BA A-MAP IE carries the broadcast assignment information for the M2M device and the broadcast assignment information indicates a resource region to which the MAC control message is being transmitted;
• and
• receive the MAC control message through the resource region which is indicated by the broadcast assignment information by using the receiver, when a cyclic redundancy check (CRC) bit masked to the BA A-MAP IE indicates that the BA A-MAP IE is for a M2M broadcast assignment,
• wherein the CRC bit being masked to the BA A-MAP IE is configured to a 1-bit masking prefix, a 3-bit type indicator, and a 12-bit masking code, and
• wherein the masking code is used to mask the BA A-MAP IE for the M2M broadcast assignment.

A base station for transmitting a Medium Access Control (MAC) control message in a wireless access system, the base station comprising:

• a transmitter;
• a receiver;
• and
• a processor for supporting a transmission of the MAC control message,
• wherein the base station is configured to:
• transmit a broadcast assignment map information element (BA A-MAP IE) including a function index field and broadcast assignment information by using the transmitter, wherein the function index field indicates that the BA A-MAP IE carries the broadcast assignment information for the M2M device and the broadcast assignment information indicates a resource region to which the MAC control message is being transmitted;
• and
• transmit the MAC control message through the resource region which is indicated by the broadcast assignment information,
• wherein a cyclic redundancy check (CRC) bit masked to the BA A-MAP IE indicates that the BA A-MAP IE is for a M2M broadcast assignment,
• wherein the CRC bit being masked to the BA A-MAP IE is configured to a 1-bit masking prefix, a 3-bit type indicator, and a 12-bit masking code, and
• wherein the masking code is used to mask the BA A-MAP IE for the M2M broadcast assignment.