Method for receiving, by terminal, downlink signal on basis of random access channel procedure in unlicensed band, and apparatus therefor
A terminal receives a downlink signal on the basis of a random access channel procedure (RACH procedure) in an unlicensed band. In particular, a first physical random access channel (PRACH) preamble is transmitted through message A, in response to the message A, a random access response (RAR) is received through message B related to contention resolution, information on at least one DRX timer for setting a discontinuous reception (DRX) operation is received, and a downlink signal is received during an On duration on the basis of the at least one DRX timer, wherein the first PRACH preamble is a PRACH preamble mapped to a physical uplink shared channel (PUSCH) occasion for the message A, and a window for reception of the message B may start after at least one symbol from the last symbol of the PUSCH occasion.
1. A method of receiving a downlink signal based on a random access procedure by a terminal, the method comprising:
transmitting, through a message A, only a physical random access channel (PRACH) preamble, without transmitting both the PRACH and a physical uplink shared channel (PUSCH) in the message A, to a base station;
receiving a random access response (RAR) through a message B from the base station, in response to the message A;
receiving, from the base station, information regarding at least one discontinuous reception (DRX) timer for configuration of DRX operation; and
receiving, from the base station, a downlink signal during an on duration based on the at least one DRX timer,
wherein the PRACH preamble is mapped to a PUSCH occasion for the message A,
wherein a window for detecting the message B starts at least one symbol after a last symbol of the PUSCH occasion corresponding to the PRACH preamble transmission, and
wherein the PUSCH occasion is a valid PUSCH occasion related to the PRACH preamble.
2. The method of claim 1 ,
wherein the RAR is a fallback RAR, and the fallback RAR includes uplink (UL) grant information.
3. The method of claim 2 ,
wherein a PUSCH scheduled by the UL grant information included in the fallback RAR is transmitted, and
wherein a PDSCH is received for a contention resolution.
4. The method of claim 1 ,
wherein the window starts at a first symbol of a resource related to monitoring of the message B.
5. A device for receiving a downlink signal based on a random access procedure, the device comprising:
at least one processor; and
at least one memory operably connected to the at least one processor, and storing instructions that, based on being executed by the at least one processor, perform operations comprising:
transmitting, through a message A, only a physical random access channel (PRACH) preamble, without transmitting both the PRACH and a physical uplink shared channel (PUSCH) in the message A;
receiving a random access response (RAR) through a message B, in response to the message A;
receiving information regarding at least one discontinuous reception (DRX) timer for configuration of DRX operation; and
receiving a downlink signal during an on duration based on the at least one DRX timer,
wherein the PRACH preamble is mapped to a PUSCH occasion for the message A,
wherein a window for detecting the message B starts at least one symbol after a last symbol of the PUSCH occasion corresponding to the PRACH preamble transmission, and
wherein the PUSCH occasion is a valid PUSCH occasion related to the PRACH preamble.
6. The device of claim 5 ,
wherein the RAR is a fallback RAR, and the fallback RAR includes uplink (UL) grant information.
7. The device of claim 6 ,
wherein a PUSCH scheduled by the UL grant information included in the fallback RAR is transmitted, and
wherein a PDSCH is received for a contention resolution.
8. The device of claim 5 ,
wherein the window starts at a first symbol of a resource related to monitoring of the message B.
9. A terminal for receiving a downlink signal based on a random access procedure, the terminal 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 that, based on being executed by the at least one processor, perform operations comprising:
transmitting, through a message A, only a physical random access channel (PRACH) preamble, without transmitting both the PRACH and a physical uplink shared channel (PUSCH) in the message A, to a base station;
receiving a random access response (RAR) through a message B from the base station, in response to the message A;
receiving, from the base station, information regarding at least one discontinuous reception (DRX) timer for configuration of DRX operation; and
receiving, from the base station, a downlink signal during an on duration based on the at least one DRX timer,
wherein the PRACH preamble is a PRACH preamble mapped to a PUSCH occasion for the message A,
wherein a window for detecting the message B starts at least one symbol after a last symbol of the PUSCH occasion corresponding to the PRACH preamble transmission, and
wherein the PUSCH occasion is a valid PUSCH occasion related to the PRACH preamble.
10. The terminal of claim 9 ,
wherein the RAR is a fallback RAR, and the fallback RAR includes uplink (UL) grant information.
11. The terminal of claim 10 ,
wherein a PUSCH scheduled by the UL grant information included in the fallback RAR is transmitted, and
wherein a PDSCH is received for a contention resolution.
12. The terminal of claim 9 ,
wherein the window starts at a first symbol of a resource related to monitoring of the message B.