Method for receiving downlink signal on basis of random-access channel procedure in unlicensed band, and device therefor
The present disclosure provides a method for receiving a downlink signal on the basis of a random-access channel procedure (RACH procedure) by a terminal in an unlicensed band. Specifically, the method may comprise: on the basis of a power ramping counter, configuring transmission power for message A including a first physical random-access channel (PRACH) and a first physical uplink shared channel (PUSCH); on the basis of the transmission power, transmitting message A to a base station; and receiving contention resolution-related message B from the base station in response to message A, wherein an increase is made on the basis that a transmission spatial beam for transmission of message A is configured to be identical to a transmission spatial beam related to transmission of a PRACH preceding message A.
1. A method of receiving a downlink signal on an unlicensed band by a user equipment based on a Random Access Channel (RACH) procedure, the method comprising:
configuring a transmission power for a message A including a first Physical Random Access Channel (PRACH) and a first Physical Uplink Shared Channel (PUSCH) based on a power ramping counter;
transmitting, to a base station, the message A based on the transmission power;
receiving, from the base station, a message B related to contention resolution in response to the message A;
receiving, from the base station, information about at least one Discontinuous Reception (DRX) timer for a DRX operation; and
receiving, from the base station, the downlink signal during on-duration based on the at least one DRX timer,
wherein a value of the power ramping counter increases based on that a transmission spatial beam for the transmission of the message A is configured identical to a transmission spatial beam related to transmission of a PRACH before the message A.
2. The method of claim 1 , wherein the value of the power ramping counter increases based on not failing in Listen Before Talk (LBT) for the message A.
3. The method of claim 1 , wherein the transmission of the message A corresponds to retransmission for the message A.
4. The method of claim 1 , wherein Listen Before Talk (LBT) related to the PRACH is failed.
5. The method of claim 1 , wherein the value of the power ramping counter does not increase based on that the transmission spatial beam for the transmission of the message A is configured different from the transmission spatial beam related to the transmission of the PRACH before the message A.
6. The method of claim 1 , wherein the power ramping counter is used to configure the transmission power based on that the first PRACH and the first PUSCH are transmitted together through the message A.
7. A user equipment performing a Random Access Channel (RACH) procedure on an unlicensed band, the user equipment comprising:
at least one transceiver;
at least one processor; and
at least one memory operably connected to the at least one processor and storing instructions to enable the at least one processor to perform a specific operation when executed, the specific operation comprising:
configuring a transmission power for a message A including a first Physical Random Access Channel (PRACH) and a first Physical Uplink Shared Channel (PUSCH) based on a power ramping counter;
transmitting, to a base station, the message A based on the transmission power;
receiving, from the base station, a message B related to contention resolution in response to the message A;
receiving, from the base station, information about at least one Discontinuous Reception (DRX) timer for a DRX operation; and
receiving, from the base station, a downlink signal during on-duration based on the at least one DRX timer,
wherein a value of the power ramping counter increases based on that a transmission spatial beam for the transmission of the message A is configured identical to a transmission spatial beam related to transmission of a PRACH before the message A.
8. The user equipment of claim 7 , wherein the value of the power ramping counter increases based on not failing in Listen Before Talk (LBT) for the message A.
9. The user equipment of claim 7 , wherein the transmission of the message A corresponds to retransmission for the message A.
10. The user equipment of claim 7 , wherein Listen Before Talk (LBT) related to the PRACH is failed.
11. The user equipment of claim 7 , wherein the value of the power ramping counter does not increase based on that the transmission spatial beam for the transmission of the message A is configured different from the transmission spatial beam related to the transmission of the PRACH before the message A.
12. The user equipment of claim 7 , wherein the power ramping counter is used to configure the transmission power based on that the first PRACH and the first PUSCH are transmitted together through the message A.
13. A method of transmitting a downlink signal on an unlicensed band by a base station based on a Random Access Channel (RACH) procedure, the method comprising:
receiving, from a user equipment, a message A including a first Physical Random Access Channel (PRACH) and a first Physical Uplink Shared Channel (PUSCH);
transmitting, to the user equipment, a message B related to contention resolution in response to the message A;
transmitting, to the user equipment, information about at least one Discontinuous Reception (DRX) timer for a Discontinuous Reception (DRX) operation; and
transmitting, to the user equipment, the downlink signal during on-duration based on the at least one DRX timer,
wherein a transmission power of the message A is configured based on a power ramping counter and
wherein a value of the power ramping counter increases based on that a transmission spatial beam for the transmission of the message A is configured identical to a transmission spatial beam related to transmission of a PRACH before the message A.