Method and apparatus for operating a base station and a terminal in a wireless communication system using unlicensed frequency band

A method for operating a terminal in a wireless communication system, the method comprising:

• receiving a signal for occupying a channel or data according to a mode regarding a listen before talk (LBT) from the base station,
• wherein the mode regarding the LBT is determined as a first mode or a second mode based on at least one of first information for an occupancy rate of the channel and second information for maximum allowable latency of transmission of the data,
• wherein the first mode is a mode that an end point of the LBT is earlier than a start point of a first subframe, and
• wherein the second mode is a mode that the end point of the LBT is identical to the start point of the first subframe.

An apparatus of a base station in a wireless communication system, the apparatus comprising:

• a transceiver;
• and
• at least one processor operatively coupled with the transceiver,
• wherein the at least one processor configured to control to:
• determine whether a mode regarding a listen before talk (LBT) is a first mode or a second mode based on at least one of first information for an occupancy rate of a channel and second information for maximum allowable latency of transmission of rate, and
• transmit a signal for occupying the channel or the data according to the determined mode regarding the LBT,
• wherein the first mode is a mode that an end point of the LBT is earlier than a start point of a first subframe, and
• wherein the second mode is a mode that the end point of the LBT is identical to the start point of the first subframe.

An apparatus of a terminal in a wireless communication system, the apparatus comprising:

• transceiver;
• and
• at least one processor operatively coupled with the transceiver,
• wherein the at least one processor configured to control to receive a signal for occupying a channel or data according to a mode regarding a listen before talk (LBT) from the base station,
• wherein the mode regarding the LBT is determined as a first mode or a second mode based on at least one of first information for an occupancy rate of the channel and second information for maximum allowable latency of transmission of the data,
• wherein the first mode is a mode that an end point of the LBT is earlier than a start point of a first subframe, and
• wherein the second mode is a mode that the end point of the LBT is identical to the start point of the first subframe.