Various physical channels may be used at a physical layer, and the physical channels (data corresponding to the physical channels) may be mapped to the radio frame and transmitted. As a downlink physical channel, PDCCH (Physical Downlink Control Channel)/EPDCCH (Enhanced PDCCH) informs a UE of a resource allocation of Paging Channel (PCH) and Downlink Shared Channel (DL-SCH) and information of Hybrid Automatic Repeat reQuest (HARQ) associated with DL-SCH. PDCCH/EPDCCH transfers an uplink grant, which informs a UE of a resource allocation of an uplink transmission. PDCCH and EPDCCH are different with respect to mapping resource regions. Physical DL-SCH is mapped to Downlink Shared Channel (PDSCH). Physical Control Format Indicator Channel (PCFICH) informs a UE of the number of OFDM symbols used for PDCCH, and is transmitted in every subframe. Physical Hybrid ARQ Indicator Channel (PHICH) is a downlink channel and transfers an HARQ ACK (Acknowledgement)/NACK (Non-acknowledgement) signal, which is a response to an uplink transmission. HARQ ACK/NACK signal may be referred to as HARQ ACK signal.

As an uplink physical channel, Physical Random Access Channel (PRACH) transfers a random access preamble. Physical Uplink Control Channel (PUCCH) transfers uplink control information, such as HARQ ACK as a response to a downlink transmission, Channel State Information (CSI) to indicate a channel state of a downlink channel, e.g., Channel Quality Indicator (CQI), Precoding Matrix Index (PMI), Precoding Type Indicator (PTI), Rank Indicator (RI), and the like. Physical Uplink Shared Channel (PUSCH) transfers Uplink Shared Channel (UL-SCH), which is a data channel associated with control information of the PUCCH.