Method and device for transmitting control information in wireless communication system

A wireless device for transmitting control information in a wireless communication system using a subframe transmitted in unit of a transmission time interval (TTI), comprising:

• a radio frequency (RF) unit that transmits and receives a radio signal;
• and
• a processor operatively coupled to the RF unit, wherein the processor is configured for:
• setting a downlink resource block group (RBG) comprising a downlink resource block (RB) in a downlink frequency band;
• setting an uplink RBG comprising an uplink RB in an uplink frequency, wherein each of the downlink RB and the uplink RB is transmitted through a short TTI (sTTI) which is set to be shorter than the TTI;
• if the downlink frequency band is smaller than the uplink frequency band, mapping the downlink RBG to the uplink RBG, wherein the mapping comprises setting a ratio of the number of downlink RBs and the number of uplink RBs so that the number of uplink RBGs is equal to the number of downlink RBGs, and mapping the uplink RBG and the downlink RBG according to the ratio;
• and
• transmitting control information for the mapping through the downlink RBG.