Method for channel sensing in wireless communication system and apparatus therefor

A transmitting node configured to perform channel sensing in an unlicensed band in a wireless communication system, the transmitting node comprising:

• an radio frequency (RF) transceiver;
• and
• a processor that controls the RF transceiver to:
• receive a control signal indicating a data transmission from a control node, on a plurality of scheduling units from a control node, wherein each of the plurality of scheduling units comprises a time resource for a known signal,
• receive information on a length of section in which the channel sensing for the data transmission is performed from the control node, wherein the information on the length of section k configured to a K bits field indicating one of 2K length candidates,
• perform the channel sensing during the length of section just before the data transmission, and
• transmit the data transmission and the known signal on the plurality of scheduling units,
• wherein the time resources for the known signal are configured during a predetermined time section per each of the plurality of scheduling units, and
• wherein the known signal is designed in a form of a sequence including a cell identifier (ID), an operator ID, and a subframe index.