Method and apparatus for acquiring diversity gain according to distributed resource allocation for downlink control channel in wireless communication system

A base station (BS) device for use in a wireless communication system, the BS device comprising:

• a processor configured to:
• compose each of resource elements (REs) contained in each of resource blocks (RBs) into a plurality of RE groups each having a predetermined number of REs,
• allocate antenna ports to each of the REs by allocating antenna port indexes, cyclically increased or reduced within a predetermined range, to the RBs contained in each of the plurality of RE groups, and
• allocate the plurality of RE groups in each of the RBs to transmission (Tx) resources for a downlink control channel, and
• map the plurality of RE groups into a plurality of RE group sets according to a predetermined condition;
• and
• a wireless communication module to transmit the downlink control channel to a user equipment (UE) using the Tx resources,
• wherein indexes of RE groups included in each of the plurality of RE group sets are allocated differently from each other, and
• wherein starting antenna port indexes of each of the plurality of RE group sets are different from each other.