Method and apparatus for configuring search space of a downlink control channel

A terminal in a wireless communication system, the terminal comprising:

• a transceiver configured to transmit and receive a signal;
• and
• a controller configured to:
• identify a quantity of resource elements (REs) in a physical resource block (PRB) pair for an enhanced physical downlink control channel (E-PDCCH),
• identify a quantity of E-PDCCH candidates of each of aggregation levels based on the identified quantity of REs in the PRB pair and whether a downlink control information (DCI) format for the E-PDCCH is included in a predefined group of DCI format, and
• receive downlink control information by monitoring the E-PDCCH candidates in an E-PDCCH search space,
• wherein the E-PDCCH search space is determined based on the identified quantity of E-PDCCH candidates.

A method by a base station in a wireless communication system, the method comprising:

• identifying a quantity of resource elements (REs) in a physical resource block (PRB) pair for an enhanced physical downlink control channel (E-PDCCH);
• identifying a quantity of E-PDCCH candidates of each of aggregation levels based on the identified quantity of REs in the PRB pair and whether a downlink control information (DCI) format for the E-PDCCH is included in a predefined group of DCI format;
• selecting the E-PDCCH candidate in an E-PDCCH search space that is determined based on the quantity of E-PDCCH candidates;
• and
• transmitting the E-PDCCH using resources corresponding to the selected E-PDCCH candidate.

A base station in a wireless communication system, the base station comprising:

• a controller configured to transmit and receive a signal;
• and
• a controller configured to:
• identify a quantity of resource elements (REs) in a physical resource block (PRB) pair for an enhanced physical downlink control channel (E-PDCCH),
• identify a quantity of E-PDCCH candidates of each of aggregation levels based on the identified quantity of REs in the PRB pair and whether a downlink control information (DCI) format for the E-PDCCH is included in a predefined group of DCI format,
• select the E-PDCCH candidate in an E-PDCCH search space that is determined based on the quantity of E-PDCCH candidates, and
• transmit the E-PDCCH using resources corresponding to the selected E-PDCCH candidate.