Method and apparatus for transmitting and receiving control channels by restricting a set of the control channels in a wireless communication system

A method for receiving control information, performed by a terminal of a wireless communication system, the method comprising:

• receiving, from a base station, information associated with a resource region carrying a control channel;
• receiving, from the base station, by upper layer signaling, a plurality of values associated with control channel candidates, each of the plurality of values corresponding to each of a plurality of numbers associated with control channel elements (CCEs) constituting one control channel candidate, wherein the each of the plurality of values indicates a number of control channel candidates to be monitored by the terminal;
• determining at least one of the control channel candidates to be monitored by the terminal based on an identifier (ID) of the terminal and at least one of the plurality of values associated with the control channel candidates;
• and
• monitoring the at least one of the control channel candidates in the resource region to receive the control information.

A base station for transmitting control information in a wireless communication system, the base station comprising:

• a transceiver;
• and
• at least one processor operably connected to the transceiver and configured to:
• transmit, to a terminal, by controlling the transceiver, information associated with a resource region carrying a control channel,
• transmit, to the terminal, by controlling the transceiver, by upper layer signaling, a plurality of values associated with control channel candidates, each of the plurality of values corresponding to each of a plurality of numbers associated with control channel elements (CCEs) constituting one control channel candidate, wherein the each of the plurality of values indicates a number of control channel candidates to be monitored by the terminal, and
• transmit, by controlling the transceiver, the control information to the terminal through a first control channel candidate in the resource region,
• wherein the first control channel candidate includes one of at least one of the control channel candidates to be monitored by the terminal, the at least one control channel candidates being defined based on an identifier (ID) of the terminal and at least one of the plurality of values associated with the control channel candidates.

A terminal for receiving control information in a wireless communication system, the terminal comprising:

• a transceiver;
• and
• at least one processor operably connected to the transceiver and configured to:
• receive, from a base station, by controlling the transceiver, information associated with a resource region carrying a control channel,
• receive, from the base station, by controlling the transceiver, by upper layer signaling, a plurality of values associated with control channel candidates, each of the plurality of values corresponding to each of a plurality of numbers associated with control channel elements (CCEs) constituting one control channel candidate, wherein the each of the plurality of values indicates a number of control channel candidates to be monitored by the terminal,
• determine at least one of the control channel candidates to be monitored by the terminal at based on an identifier (ID) of the terminal and at least one of the plurality of values associated with the control channel candidates, and
• monitor the at least one of the control channel candidates in the resource region to receive the control information.