Uplink data may be transmitted on a PUSCH, and the uplink data may be a transport block (TB) that is a data block for a UL-SCH transmitted during a transmission time interval (TTI). The TB may include user data. Further, the uplink data may be multiplexed data. In the multiplexed data, the TB for the UL-SCH and uplink control information may be multiplexed. That is, when user data to be transmitted through an uplink is present, the UL control information may be multiplexed together with the user data and be transmitted through the PUSCH.

Recently, a method of supporting D2D communication that uses a transmission and reception technology of a wireless communication system in a frequency band of the wireless communication system or a band excluding the frequency band, and in this instance, enables user data to be directly transmitted and received between devices, for example, UEs without using an infrastructure, for example, an eNB, is in consideration. The D2D communication enables wireless communication to be available in an area outside of a limited wireless communication infrastructure and may also decrease network load of the wireless communication system. Also, the D2D communication may transmit disaster-related information to UEs even in a situation in which eNBs are not in normal operation due to, for example, a war and a disaster.