Device, method, and computer-readable storage medium for transmitting and receiving information for performing communication in unlicensed band

1 . A first user equipment (UE) comprising:

a transceiver to transmit and receive a wireless signal; and

a processor connected to the transceiver, wherein the processor is configured to:

receive, from a base station, a radio resource control (RRC) message including a parameter indicating that information on a channel occupancy time (COT) duration is allowed to be transmitted by a physical sidelink control channel (PSCCH);

receive first sidelink control information (SCI) from a second UE through a physical sidelink control channel (PSCCH) configured in shared spectrum, wherein the first SCI includes 1-bit indicator associated with channel access, and

wherein the 1-bit indicator is included in the first SCI in case that the parameter, indicating that information on the COT duration is allowed to be transmitted by the PSCCH, is received through the RRC message;

receive a second SCI used for sidelink scheduling from the second UE through a physical sidelink shared channel (PSSCH) determined based on the first SCI, wherein the first SCI and the second SCI are configured in different formats, and wherein the second SCI includes information on the COT duration for the second UE;

based on the second SCI, identify the information on the COT duration for the second UE in the shared spectrum; and

perform, based on the information on the COT duration for the second UE, a sidelink communication with the second UE in the shared spectrum.

2 . The first UE according to claim 1 , wherein the at least one of the first SCI and the second SCI includes information on channel access, or information on feedback request.

3 . The first UE according to claim 2 , wherein size of the information on channel access is set based on another parameter being configured by the RRC signaling.

4 . The first UE according to claim 2 , wherein the information on feedback request is to set a first value for indicating that feedback is requested or a second value for indicating that the feedback is not requested.

5 . The first UE according to claim 1 , wherein the processor is further configured to:

receive downlink control information (DCI) related to the shared spectrum, wherein the DCI includes information on channel in the shared spectrum for performing the sidelink communication with the second UE; and

determine a channel for performing the sidelink communication with the second UE.

6 . The first UE according to claim 1 , wherein the processor is further configured to transmit capability information on the sidelink communication in the shared spectrum to the second UE.

7 . The first UE according to claim 6 , wherein the processor is further configured to:

identify that reliability of communication with the second UE in licensed band is less than or equal to a designated value while performing the sidelink communication with the second UE; and

based on identifying that the reliability of communication with the second UE in the licensed band is less than or equal to the designated value, request the communication in the shared spectrum.

8 . The first UE according to claim 1 , wherein the 1-bit indicator is not included in the first SCI in case that the parameter, indicating that information on the COT duration is allowed to be transmitted by the PSCCH, is not received through the RRC message.

9 . A method for operating a first user equipment (UE) comprising:

receiving, from a base station, a radio resource control (RRC) message including a parameter indicating that information on a channel occupancy time (COT) duration is allowed to be transmitted by a physical sidelink control channel (PSCCH);

receiving first sidelink control information (SCI) from a second UE through a physical sidelink control channel (PSCCH) configured in shared spectrum, wherein the first SCI includes 1-bit indicator associated with channel access, and

wherein the 1-bit indicator is included in the first SCI in case that the parameter, indicating that information on the COT duration is allowed to be transmitted by the PSCCH, is received through the RRC message;

receiving a second SCI used for sidelink scheduling from the second UE through a physical sidelink shared channel (PSSCH) determined based on the first SCI, wherein the first SCI and the second SCI are configured in different formats, and wherein the second SCI includes information on the COT duration for the second UE;

based on the second SCI, identifying the information on the COT duration for the second UE in the shared spectrum; and

performing, based on the information on the COT duration for the second UE, a sidelink communication with the second UE in the shared spectrum.

10 . The method according to claim 9 , wherein the at least one of the first SCI and the second SCI includes information on channel access, or information on feedback request.

11 . The method according to claim 10 , wherein size of the information on channel access is set based on another parameter being configured by the RRC signaling.

12 . The method according to claim 10 , wherein the information on feedback request is set to a first value for indicating that feedback is requested or a second value for indicating that the feedback is not requested.

13 . The method according to claim 9 , further comprising:

receiving downlink control information (DCI) related to the shared spectrum, wherein the DCI includes information on channel in the shared spectrum for performing the sidelink communication; and

determining a channel for performing the sidelink communication with the second UE.

14 . The method according to claim 9 , further comprising:

transmitting capability information on the sidelink communication in the shared spectrum.

15 . The method according to claim 14 , further comprising:

identifying that reliability of communication with the second UE in licensed band is less than or equal to a designated value while performing the sidelink communication with the second UE; and

based on identifying that the reliability of communication with the second UE in the licensed band is less than or equal to the designated value, requesting the communication in the shared spectrum.

16 . The method according to claim 9 , wherein the 1-bit indicator is not included in the first SCI in case that the parameter, indicating that information on the COT duration is allowed to be transmitted by the PSCCH, is not received through the RRC message.

17 . A second user equipment (UE) comprising:

a transceiver to transmit and receive a wireless signal; and

a processor connected to the transceiver, wherein the processor is configured to:

receive, from a base station, a radio resource control (RRC) message including a parameter indicating that information on a channel occupancy time (COT) duration is allowed to be transmitted by a physical sidelink control channel (PSCCH);

transmit first sidelink control information (SCI) to the first UE through a physical sidelink control channel (PSCCH) configured in shared spectrum, wherein the first SCI includes 1-bit indicator associated with channel access, and

wherein the 1-bit indicator is included in the first SCI in case that the parameter, indicating that information on the COT duration is allowed to be transmitted by a PSCCH, is received through the RRC message;

transmit a second SCI used for sidelink scheduling to the first UE through a physical sidelink shared channel (PSSCH) determined based on the first SCI, wherein the first SCI and the second SCI are configured in different formats, and wherein the second SCI includes information on the COT duration for the second UE; and

perform, based on the information on the COT duration for the second UE, a sidelink communication with the first UE in the shared spectrum.

18 . The second UE according to claim 17 , wherein the processor is further configured to transmit capability information on communication in the shared spectrum to the first UE.

19 . The second UE according to claim 17 , wherein the at least one of the first SCI and the second SCI includes information on channel access, or information on feedback request.

20 . The second UE according to claim 19 , wherein the processor is further configured to:

receive downlink control information (DCI) related to the shared spectrum, wherein the DCI includes information on channel in the shared spectrum for performing the sidelink communication with the first UE; and

determine a channel for performing the sidelink communication with the first UE.