Method and apparatus for uplink channel accessing wireless communication system

A user equipment (UE) in a communication system, the UE comprising:

• a transceiver;
• and
• at least one processor configured to:
• receive, from a base station, information indicating a channel access type via downlink control information (DCI), wherein the information indicates the channel access type as one of a first type to sense a channel to be idle before an uplink (UL) transmission using a random time duration, a second type to sense the channel to be idle before the UL transmission using a deterministic time duration, or a third type not to sense the channel before the UL transmission, and
• transmit, to the base station, the UL transmission according to the channel access type.

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

• a transceiver;
• and
• at least one processor configured to:
• transmit, to a user equipment (UE), information indicating a channel access type via downlink control information (DCI), wherein the information indicates the channel access type as one of a first type to sense a channel to be idle before an uplink (UL) transmission using a random time duration, a second type to sense the channel to be idle before the UL transmission using a deterministic time duration, or a third type not to sense the channel before the UL transmission, and
• receive, from the UE, the UL transmission.