Method and device for channel access in wireless communication system

1. A method of performing a channel access procedure of a terminal in an unlicensed band, the method comprising:

receiving, via a system information block (SIB), from a base station, information indicating a type of the channel access procedure in the unlicensed band;

receiving, from the base station, a frame-based channel access procedure configuration including a fixed frame period (FFP);

in case that the type of the channel access procedure is a frame based channel access procedure, determining, based on the FFP, a channel occupancy time (COT) and a start time of a channel occupancy, wherein the start time of the channel occupancy is determined based on a time duration and the FFP; and

transmitting, to the base station, an uplink signal based on a downlink signal from the base station within the COT.

2. The method of claim 1 , wherein the downlink signal includes at least one of a demodulation reference signal (DMRS), a physical downlink control channel (PDCCH) and a pre-set signal.

3. The method of claim 1 , wherein a maximum COT is determined by equation 2:

COT= FFP*Z/ 100, wherein Z= 95.  [equation 2]

4. The method of claim 1 , further comprising receiving, from the base station, remaining channel occupancy time (RCOT) information for the base station not to transmit the downlink signal during the COT,

wherein the transmitting of the uplink signal to the base station comprises: transmitting the uplink signal without scheduling on an uplink from the base station, based on the RCOT information.

5. The method of claim 1 , wherein, in case that the base station is not occupying the channel within the COT, the transmitting of the uplink signal is not performed.

6. A method of performing a channel access procedure of a base station in an unlicensed band, the method comprising:

determining a type of the channel access procedure in the unlicensed band;

transmitting, via a system information block (SIB), to a terminal, information about indicating the type of the channel access procedure;

transmitting, to the terminal, a frame-based channel access procedure configuration including a frame period (FFP);

in case that the type of the channel access procedure is a frame based channel access procedure, determining a channel occupancy time (COT) in the FFP; and

receiving, from the terminal, an uplink signal based on a downlink signal to the terminal within the COT,

wherein a start time of the channel occupancy is determined based on a time duration and the FFP.

7. A terminal for performing a channel access procedure in an unlicensed band, the terminal comprising:

a transceiver;

at least one memory storing a program and data for performing the channel access procedure in the unlicensed band; and

at least one processor, by executing the program stored in the at least one memory, configured to:

receive, via a system information block (SIB), from a base station, information indicating a type of the channel access procedure in the unlicensed band;

receive, from the base station, a frame-based channel access procedure configuration including a fixed frame period (FFP);

in case that the type of the channel access procedure is a frame based channel access procedure, determine, based on the FFP, a channel occupancy time (COT) and a start time of a channel occupancy time, wherein the start time of the channel occupancy is determined based on a time duration and the FFP; and

transmit, to the base station, an uplink signal based on a downlink signal from the base station within the COT.

8. The terminal of claim 7 , wherein the downlink signal includes at least one of a demodulation reference signal (DMRS), a physical downlink control channel (PDCCH) and a pre-set signal.

9. The terminal of claim 8 , wherein the at least one processor is further configured to:

receive, from the base station, remaining channel occupancy time (RCOT) information for the base station not to transmit the downlink signal during the COT; and

transmit the uplink signal without scheduling on an uplink from the base station, based on the RCOT information.

10. The terminal of claim 8 , wherein the at least one processor is further configured to, in case that the base station is not occupying the channel within the COT, not perform the transmitting of the uplink signal.

11. The terminal of claim 7 , wherein a maximum COT is determined by equation 2:

COT= FFP*Z/ 100, wherein Z= 95.  [equation 2]

12. A base station for performing a channel access procedure in an unlicensed band, the base station comprising:

a transceiver;

at least one memory storing a program and data for performing the channel access procedure in the unlicensed band; and

at least one processor configured to execute the program stored in the at least one memory to:

determine a type of the channel access procedure in the unlicensed band,

transmit, via a system information block (SIB), to a terminal, information indicating the type of the channel access procedure,

transmit, to the terminal, a frame-based channel access procedure configuration including a fixed frame period (FFP),

in case that the type of the channel access procedure is a frame based channel access procedure, determine a channel occupancy time (COT) in the FFP, and

receive, from the terminal, an uplink signal based on a downlink signal to the terminal within the COT,

wherein a start time of the channel occupancy is determined based on a time duration and the FFP.