Method for transmitting signal in wireless communication system supporting unlicensed band, and device supporting same
The present disclosure relates to a method for transmitting a signal in a wireless communication system supporting an unlicensed band, and a device supporting the method. The method according to an embodiment of the present disclosure may comprises: performing a channel access procedure for multiple frequency bandwidth units included in an activated bandwidth part; and transmitting a data signal through an unlicensed band based on the channel access procedure.
1. A method performed by an apparatus operating in a wireless communication system, the method comprising:
obtaining an uplink (UL) resource comprising a plurality of frequency bandwidth units of a carrier bandwidth; and
performing a channel access procedure (CAP) for an UL transmission configured in the UL resource,
wherein the CAP is performed on the plurality of frequency bandwidth units,
wherein each of the plurality of frequency bandwidth units comprises resource blocks (RBs) that are contiguous in frequency,
wherein a bandwidth part (BWP) is configured in the carrier bandwidth, and
wherein a unit to configure the BWP is limited to a frequency bandwidth unit among the plurality of frequency bandwidth units.
2. The method of claim 1 , wherein the UL resource is obtained based on downlink control information (DCI) scheduling the UL transmission.
3. The method of claim 1 , further comprising: receiving information related to configuration regarding the BWP,
wherein the BWP is not configured to partially comprise respective frequency bandwidth unit included in the plurality of frequency bandwidth units.
4. The method of claim 3 , wherein the BWP is configured to completely comprise respective frequency bandwidth unit included in the plurality of frequency bandwidth units.
5. The method of claim 1 , further comprising: transmitting a demodulation reference signal (DM-RS),
wherein a transmission start time of the DM-RS is determined based on a predetermined method, and
wherein the predetermined method comprises at least one of:
the transmission start time of the DM-RS being determined based on a start time of the CAP and a transmission start time of the UL transmission; or
the transmission start time of the DM-RS being determined by shifting, based on the CAP, a location of a symbol to which the DM-RS is mapped.
6. The method of claim 1 , wherein the UL transmission comprises a transmission block with a different redundancy version (RV) for each of the plurality of frequency bandwidth units.
7. The method of claim 6 , wherein different RVs are related to different RV indices that are determined based on at least one of: (i) downlink control information (DCI) scheduling the UL transmission on the UL resource, or (ii) a function related to the plurality of frequency bandwidth units.
8. The method of claim 1 , wherein at least a part of the UL transmission is not transmitted based on failing to access at least one frequency bandwidth unit among the plurality of frequency bandwidth units according to the CAP.
9. The method of claim 8 , wherein the UL transmission is transmitted based on success to access all of the plurality of frequency bandwidth units according to the CAP, and
wherein the UL transmission is not transmitted based on failing to access the at least one frequency bandwidth unit according to the CAP.
10. An apparatus configured to operate in a wireless communication system, the apparatus comprising:
a memory; and
at least one processor coupled with the memory,
wherein the at least one processor is configured to:
obtain an uplink (UL) resource comprising a plurality of frequency bandwidth units of a carrier bandwidth; and
perform a channel access procedure (CAP) for an UL transmission configured in the UL resource,
wherein the CAP is performed on the plurality of frequency bandwidth units,
wherein each of the plurality of frequency bandwidth units comprises resource blocks (RBs) that are contiguous in frequency,
wherein a bandwidth part (BWP) is configured in the carrier bandwidth, and
wherein a unit to configure the BWP is limited to a frequency bandwidth unit among the plurality of frequency bandwidth units.
11. The apparatus of claim 10 , wherein the UL resource is obtained based on downlink control information (DCI) scheduling the UL transmission.
12. The apparatus of claim 10 , wherein the at least one processor is further configured to:
receive information related to configuration regarding the BWP,
wherein the BWP is not configured to partially comprise respective frequency bandwidth unit included in the plurality of frequency bandwidth units.
13. The apparatus of claim 12 , wherein the BWP is configured to completely comprise respective frequency bandwidth unit included in the plurality of frequency bandwidth units.
14. The apparatus of claim 10 , wherein the at least one processor is further configured to:
transmit a demodulation reference signal (DM-RS),
wherein a transmission start time of the DM-RS is determined based on a predetermined method, and
wherein the predetermined method comprises at least one of:
the transmission start time of the DM-RS being determined based on a start time of the CAP and a transmission start time of the UL transmission; or
the transmission start time of the DM-RS being determined by shifting, based on the CAP, a location of a symbol to which the DM-RS is mapped.
15. The apparatus of claim 10 , wherein the UL transmission comprises a transmission block with a different redundancy version (RV) for each of the plurality of frequency bandwidth units.
16. The apparatus of claim 15 , wherein different RVs are related to different RV indices that are determined based on at least one of: (i) downlink control information (DCI) scheduling the UL transmission on the UL resource, or (ii) a function related to the plurality of frequency bandwidth units.
17. The apparatus of claim 10 , wherein at least a part of the UL transmission is not transmitted based on failing to access at least one frequency bandwidth unit among the plurality of frequency bandwidth units according to the CAP.
18. The apparatus of claim 17 , wherein the UL transmission is transmitted based on success to access all of the plurality of frequency bandwidth units according to the CAP, and
wherein the UL transmission is not transmitted based on failing to access the at least one frequency bandwidth unit according to the CAP.