Method for transmitting and receiving signal in wireless communication system supporting unlicensed band, and apparatus supporting same
The present disclosure relates to a wireless communication system. More specifically, the present disclosure relates to: a method for transmitting a physical random access channel (PRACH) in at least one carrier from among a first carrier group on the basis of a channel sensing result, receiving a random access response (RAR) in at least one carrier from among a second carrier group in response to the transmission of the PRACH, and transmitting a physical uplink shared channel (PUSCH) on the basis of the RAR; and an apparatus therefor.
1. A communication method performed by a device in a wireless communication system, the method comprising:
performing a first channel sensing on at least one sub-band included in a bandwidth part (BWP);
transmitting, through a sub-band of the at least one sub-band, a physical random access channel (PRACH) based on the first channel sensing on the sub-band succeeding;
receiving a random access response (RAR) in response to the PRACH;
performing a second channel sensing on the sub-band; and
transmitting, through the sub-band, a physical uplink shared channel (PUSCH) based on the RAR and based on the second channel sensing succeeding.
2. The method of claim 1 ,
wherein the BWP is one of a set of BWPs, and
wherein the BWP is configured by a synchronization signal block (SSB) or a physical downlink control channel (PDCCH).
3. The method of claim 1 , wherein the first channel sensing is performed on the sub-band with a highest reference signal received power (RSRP) for a synchronization signal block (SSB).
4. The method of claim 1 , wherein the sub-band is a subband related to a lowest energy detection (ED) level based on the channel sensing or the sub-band that has a PRACH transmission time closest to a channel sensing time.
5. The method of claim 1 , wherein the RAR is received on at least one sub-band in a BWP that is identical to the BWP.
6. The method of claim 1 , wherein the RAR is received on at least one sub-band in a BWP that is different from the BWP.
7. A non-transitory medium which is readable by a processor and storing instructions cause the processor to perform the method of claim 1 .
8. The method of claim 1 , wherein, based on the first channel sensing on the at least one sub-band failing:
performing a third channel sensing on another sub-band, excluding the at least one sub-band; and
transmitting, through the other sub-band, the PRACH based on the third channel sensing succeeding.
9. The method of claim 1 , wherein, based on the second channel sensing failing:
performing a fourth channel sensing on the sub-band; and
transmitting, through the sub-band, the PUSCH based on the fourth channel sensing succeeding.
10. A device used in a wireless communication system, the device comprising:
a memory; and
a processor,
wherein the processor is configured to:
perform a first channel sensing on at least one sub-band included in bandwidth part, BWP;
transmit, through a sub-band of the at least one sub-band, a physical random access channel (PRACH) based on the first channel sensing on the sub-band succeeding
receive a random access response (RAR) in response to the PRACH;
perform a second channel sensing on the sub-band; and
transmit, through the sub-band, a physical uplink shared channel (PUSCH) based on the RAR and based on the second channel sensing succeeding.
11. The device of claim 10 ,
wherein the BWP is one of a set of BWPs, and
wherein the BWP is configured by a synchronization signal block (SSB) or a physical downlink control channel (PDCCH).
12. The device of claim 10 , wherein the first channel sensing is performed on the sub-band with a highest reference signal received power (RSRP) for a synchronization signal block (SSB).
13. The device of claim 10 , wherein the sub-band is a subband related to a lowest energy detection (ED) level based on the channel sensing or the sub-band that has a PRACH transmission time closest to a channel sensing time.
14. The device of claim 10 , wherein the RAR is received on at least one sub-band in a BWP that is identical to the BWP.
15. The device of claim 10 , wherein, based on the first channel sensing on the at least one sub-band failing:
performing a third channel sensing on another sub-band, excluding the at least one sub-band; and
transmitting, through the other sub-band, the PRACH based on the third channel sensing succeeding.
16. The device of claim 10 , wherein, based on the second channel sensing failing:
performing a fourth channel sensing on the sub-band; and
transmitting, via the sub-band, the PUSCH based on the fourth channel sensing succeeding.