Method and device for transmitting downlink control signal in wireless communication system

A machine to machine (M2M) device in a wireless communication system, the M2M device comprising:

• a radio frequency (RF) unit for transmitting or receiving a radio signal;
• and
• a processor connected to the RF unit, and configured for:
• receiving a first downlink control signal from a base station, wherein the first downlink control signal relates to a machine to machine (M2M) group control information that is commonly assigned for all M2M devices included in a M2M group;
• and
• receiving a second downlink control signal from the base station, wherein the second downlink control signal relates to specific M2M device control information that is assigned for only a specific M2M device in the M2M group,
• wherein the first downlink control signal and the second downlink control signal are received using a group downlink control information (DCI) format,
• wherein the group DCI format comprises a field for a user equipment (UE) identification, a field for the M2M group control information, a field for the specific M2M device control information, and a field for a cyclic redundancy check (CRC),
• wherein the UE identification is used to identify the M2M device,
• wherein the CRC is used to mask an identifier (ID) of the M2M group,
• wherein the group DCI format further comprises a field for scheduling of multicast information that is commonly assigned to the M2M group, and
• wherein the multicast information relates to a message requesting a group report.

A method of receiving a downlink control signal in a wireless communication system, the method comprising:

• receiving a first downlink control signal from a base station, wherein the first downlink control signal relates to M2M group control information that is commonly assigned for all M2M devices included in the M2M group;
• and
• receiving a second downlink control signal from the base station, wherein the second downlink control signal relates to specific M2M device control information that is assigned for only a specific M2M device in the M2M group,
• wherein the first downlink control signal and the second downlink control signal are received using a group downlink control information (DCI) format,
• wherein the group DCI format comprises a field for a user equipment (UE) identification, a field for the M2M group control information, a field for the specific M2M device control information, and a field for a cyclic redundancy check (CRC),
• wherein the UE identification is used to identify the M2M device,
• wherein the CRC is used to mask an identifier (ID) of the M2M group,
• wherein the group DCI format further comprises a field for scheduling of multicast information that is commonly assigned to the M2M group, and
• wherein the multicast information relates to a message requesting a group report.