Method and apparatus for indicating channel occupancy time in wireless communication system
A method, performed by a base station (BS), of indicating a channel occupancy time of an unlicensed band is provided and includes transmitting physical downlink control channel (PDCCH) configuration information to a user equipment (UE), performing a channel access procedure to occupy a channel of the unlicensed band, and transmitting slot format indicator information about at least one slot within a channel occupancy time occupied by performing the channel access procedure, based on the PDCCH configuration information, wherein the slot format indicator information is determined based on at least one of a maximum channel occupancy time of the BS or the channel occupancy time occupied by performing the channel access procedure.
1. A method, performed by a user equipment (UE), of obtaining channel occupancy time information, the method comprising:
receiving a higher layer signaling;
detecting downlink control information (DCI), based on at least one of configuration information of a control resource set (CORESET) and configuration information of a search space set included in the higher layer signaling;
identifying slot format indicator (SFI) information included in the DCI, wherein the SFI information comprises a slot format combination identifier indicating slot formats of slots corresponding to a channel occupancy time starting from a slot in which the DCI including the SFI information is detected; and
identifying the channel occupancy time of a base station (BS), based on a number of slots whose slot format is indicated by the SFI information.
2. The method of claim 1 , wherein the higher layer signaling further includes at least one of offset information or period information for monitoring the DCI.
3. A method, performed by a base station (BS), of indicating a channel occupancy time, the method comprising:
transmitting a higher layer signaling to a user equipment (UE);
performing a channel access procedure to occupy a channel; and
transmitting, within the channel occupancy time, downlink control information (DCI) including slot format indicator (SFI) information based on at least one of configuration information of a control resource set (CORESET) and configuration information of a search space set included in the higher layer signaling, the channel occupancy time being occupied by performing the channel access procedure,
wherein the SFI information comprises a slot format combination identifier indicatinga slot formats of slots corresponding to the channel occupancy time starting from a slot in which the DCI including the SFI information is transmitted, and
wherein the UE identifies the channel occupancy time of the BS based on a number of slots whose slot format is indicated by the SFI information.
4. The method of claim 3 , wherein the higher layer signaling further includes at least one of offset information or period information for monitoring the DCI.
5. A user equipment (UE) for obtaining channel occupancy time information, the UE comprising:
a transceiver; and
a processor coupled with the transceiver and configured to:
receive a higher layer signaling;
detect downlink control information (DCI), based on at least one of configuration information of a control resource set (CORESET) and configuration information of a search space set included in the higher layer signaling;
identify slot format indicator (SFI) information included in the DCI, wherein the SFI information comprises a slot format combination identifier indicating slot formats of slots corresponding to a channel occupancy time starting from a slot in which the DCI including the SFI information is detected; and
identify the channel occupancy time of a base station (BS), based on a number of slots whose slot format is indicated by the SFI information.
6. The UE of claim 5 , wherein the higher layer signaling further includes at least one of offset information or period information for monitoring the DCI.
7. A base station (BS) for indicating a channel occupancy time, the BS comprising:
a transceiver; and
a processor coupled with the transceiver and configured to:
transmit a higher layer signaling to a user equipment (UE);
perform a channel access procedure to occupy a channel; and
transmit, within the channel occupancy time, downlink control information (DCI) including slot format indicator (SFI) information based on at least one of configuration information of a control resource set (CORESET) and configuration information of a search space set included in the higher layer signaling, the channel occupancy time being occupied by performing the channel access procedure,
wherein the SFI information comprises a slot format combination identifier indicating aslot formats of slots corresponding to the channel occupancy time starting from a slot in which the DCI including the SFI information is transmitted, and
wherein the UE identifies the channel occupancy time of the BS based on a number of slots whose slot format is indicated by the SFI information.
8. The BS of claim 7 , wherein the higher layer signaling further includes at least one of offset information or period information for monitoring the DCI.