Method and apparatus for identifying uplink signal transmission timing in wireless communication system

A method of a base station in a wireless communication system, the method comprising:

• transmitting, to a terminal, downlink control information (DCI) including information on a first transmission starting position in a subframe for an unlicensed band for an uplink signal;
• in case that a channel in the unlicensed band is accessible by the terminal, receiving the uplink signal at the first transmission starting position from the terminal, wherein, in case that the channel in the unlicensed band is not accessible by the terminal, a channel access is performed until a second transmission starting position in the subframe;
• and
• in case that the channel in the unlicensed band is accessible by the terminal before the second transmission starting position, receiving the uplink signal from the second transmission starting position from the terminal,
• wherein uplink data in resource elements before the second transmission starting position is punctured in case that the uplink signal is received from the second transmission starting position.

A terminal in a wireless communication system, the terminal comprising:

• a transceiver;
• and
• at least one processor configured to:
• receive, from a base station, downlink control information (DCI) including information on a first transmission starting position in a subframe for an unlicensed band for an uplink signal of the terminal,
• perform a channel access in the unlicensed band,
• in case that a channel in the unlicensed band is not accessible by the terminal before the first transmission starting position based on a channel access result, perform the channel access until a second transmission starting position in the subframe, and
• in case that the channel in the unlicensed band is accessible by the terminal before the second transmission starting position, transmit the uplink signal from the second transmission starting position,
• wherein uplink data in resource elements before the second transmission starting position is punctured in case that the uplink signal is transmitted from the second transmission starting position.

A base station in a wireless communication system, the base station comprising:

• a transceiver;
• and
• at least one processor configured to:
• transmit, to a terminal, downlink control information (DCI) including information on a first transmission starting position in a subframe for an unlicensed band for an uplink signal,
• in case that a channel in the unlicensed band is accessible by the terminal, receive the uplink signal at the first transmission starting position from the terminal, wherein, in case that the channel in the unlicensed band is not accessible by the terminal, a channel access is performed until a second transmission starting position in the subframe, and
• in case that the channel in the unlicensed band is accessible by the terminal before the second transmission starting position, receive the uplink signal from the second transmission starting position from the terminal,
• wherein uplink data in resource elements before the second transmission starting position is punctured in case that the uplink signal is received from the second transmission starting position.