US-12621869-B2 - Method and apparatus for transmitting/receiving wireless signal in wireless communication system

Abstract

According to an embodiment of the present disclosure, a UE may determine not to transmit the HARQ feedback report for a UE-group common PDSCH at least during a random access procedure is on-going, even though the HARQ process has been enabled for the UE-group common PDSCH.

Inventors

• Youngdae Lee
• Suckchel YANG
• Seonwook Kim

Assignees

• LG ELECTRONICS INC.

Dates

Publication Date

20260505

Application Date

20220406

Priority Date

20210406

Claims (13)

1. 1 . A method of transmitting a signal by a user equipment (UE) in a wireless communication system, the method comprising: performing a first random access procedure including a first random access preamble transmission; receiving a UE-group common physical downlink control channel (PDCCH) after successful completion of the first random access procedure; receiving a UE-group common physical downlink shared channel (PDSCH) based on the UE-group common PDCCH; and performing a second random access procedure including a second random access preamble transmission after the successful completion of the first random access procedure, wherein, based on that i) a hybrid automatic repeat request (HARQ) process is enabled for the UE-group common PDSCH, ii) the second random access procedure has been triggered before transmitting a HARQ feedback report for the UE-group common PDSCH, and iii) the second random access procedure is not completed: the UE determines not to transmit the HARQ feedback report for the UE-group common PDSCH at least during the second random access procedure is on-going.
2. 2 . The method according to claim 1 , wherein the UE does not transmit the HARQ feedback report for the UE-group common PDSCH even though the HARQ process has been enabled for the UE-group common PDSCH.
3. 3 . The method according to claim 1 , wherein the UE determines not to transmit the HARQ feedback report for the UE-group common PDSCH based on that the second random access procedure is related to a contention-based random access procedure.
4. 4 . The method according to claim 1 , wherein the UE determines not to transmit the HARQ feedback report for the UE-group common PDSCH based on that the second random access procedure is related to a scheduling request (SR).
5. 5 . The method according to claim 1 , wherein the UE drops the HARQ feedback report for the UE-group common PDSCH based on that the HARQ feedback report for the UE-group common PDSCH overlaps with a uplink signal transmission of the second random access procedure in a time domain.
6. 6 . The method according to claim 5 , wherein the uplink signal transmission of the second random access procedure is performed in response to a message-B (MsgB) of a 2-step random access procedure or a message 4 (Msg4) of a 4-step random access procedure.
7. 7 . The method according to claim 5 , wherein the uplink signal transmission of the second random access procedure is related to a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH).
8. 8 . The method according to claim 1 , further comprising: receiving, from a base station, a request for the HARQ feedback report after completion of the second random access procedure; and transmitting the HARQ feedback report to the base station based on the request for the HARQ feedback report.
9. 9 . A computer-readable medium storing a program for executing the method of claim 1 .
10. 10 . A device for wireless communication, the device comprising: a memory configured to store instructions; and a processor configured to perform operations by executing the instructions, wherein the operations performed by the processor comprise: performing a first random access procedure including a first random access preamble transmission; receiving a group common physical downlink control channel (PDCCH) after successful completion of the first random access procedure; receiving a group common physical downlink shared channel (PDSCH) based on the group common PDCCH; and performing a second random access procedure including a second random access preamble transmission after the successful completion of the first random access procedure, wherein, based on that i) a hybrid automatic repeat request (HARQ) process is enabled for the group common PDSCH, ii) the second random access procedure has been triggered before transmitting a HARQ feedback report for the group common PDSCH, and iii) the second random access procedure is not completed: the processor determines not to transmit the HARQ feedback report for the group common PDSCH at least during the second random access procedure is on-going.
11. 11 . The device of claim 10 , wherein the device is an application-specific integrated circuit (ASIC) or a digital signal processor.
12. 12 . The device of claim 10 , wherein the device is a user equipment (UE) operating in a 3rd generation partnership project (3GPP) based wireless communication system.
13. 13 . A base station (BS) for wireless communication, the BS comprising: a transceiver; and a processor configured to control the transceiver to: perform a first random access procedure including a first random access preamble reception from a user equipment (UE); transmit a UE-group common physical downlink control channel (PDCCH) after successful completion of the first random access procedure; transmit a UE-group common physical downlink shared channel (PDSCH) based on the UE-group common PDCCH; and perform a second random access procedure including a second random access preamble reception from the UE after the successful completion of the first random access procedure, wherein, based on that i) a hybrid automatic repeat request (HARQ) process is enabled for the UE-group common PDSCH, ii) the second random access procedure has been triggered before receiving a HARQ feedback report for the UE-group common PDSCH, and iii) the second random access procedure is not completed: the processor does not expect to receive the HARQ feedback report for the UE-group common PDSCH from the UE at least during the second random access procedure is on-going.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a National Stage application under 35 U.S.C. § 371 of International Application No. PCT/KR2022/004955, filed on Apr. 6, 2022, which claims the benefit of Korean Application No. 10-2021-0044784, filed on Apr. 6, 2021. The disclosures of the prior applications are incorporated by reference in their entirety. TECHNICAL FIELD The present disclosure relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting/receiving a wireless signal. BACKGROUND ART Generally, a wireless communication system is developing to diversely cover a wide range to provide such a communication service as an audio communication service, a data communication service and the like. The wireless communication is a sort of a multiple access system capable of supporting communications with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). For example, the multiple access system may be any of a code division multiple access (CDMA) system, a frequency division multiple access (FDMA) system, a time division multiple access (TDMA) system, an orthogonal frequency division multiple access (OFDMA) system, and a single carrier frequency division multiple access (SC-FDMA) system. DISCLOSURE OF INVENTION Technical Problem An object of the present disclosure is to provide a method of efficiently performing wireless signal transmission/reception procedures and an apparatus therefor. It will be appreciated by persons skilled in the art that the objects that could be achieved with the present disclosure are not limited to what has been particularly described hereinabove and the above and other objects that the present disclosure could achieve will be more clearly understood from the following detailed description. Solution to Problem In an aspect of the present disclosure, there is provided a method of transmitting a signal by a user equipment (UE) in a wireless communication system, the method may comprise performing a first random access procedure including a first random access preamble transmission; receiving a UE-group common physical downlink control channel (PDCCH) after successful completion of the first random access procedure; receiving a UE-group common physical downlink shared channel (PDSCH) based on the UE-group common PDCCH; and performing a second random access procedure including a second random access preamble transmission after the successful completion of the first random access procedure. Based on that i) a hybrid automatic repeat request (HARQ) process is enabled for the UE-group common PDSCH, ii) the second random access procedure has been triggered before transmitting a HARQ feedback report for the UE-group common PDSCH, and iii) the second random access procedure is not completed: the may determine not to transmit the HARQ feedback report for the UE-group common PDSCH at least during the second random access procedure is on-going. Preferably, the UE does not transmit the HARQ feedback report for the UE-group common PDSCH even though the HARQ process has been enabled for the UE-group common PDSCH. Preferably, the UE determines not to transmit the HARQ feedback report for the UE-group common PDSCH based on that the second random access procedure is related to a contention-based random access procedure. Preferably, the UE determines not to transmit the HARQ feedback report for the UE-group common PDSCH based on that the second random access procedure is related to a scheduling request (SR). Preferably, the UE drops the HARQ feedback report for the UE-group common PDSCH based on that the HARQ feedback report for the UE-group common PDSCH overlaps with a uplink signal transmission of the second random access procedure in a time domain. Preferably, the uplink signal transmission of the second random access procedure is performed in response to a message-B (MsgB) of a 2-step random access procedure or a message 4 (Msg4) of a 4-step random access procedure. Preferably, the uplink signal transmission of the second random access procedure is related to a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH). Preferably, the UE may receive, from a base station, a request for the HARQ feedback report after completion of the second random access procedure; and transmit the HARQ feedback report to the base station based on the request for the HARQ feedback report. In another aspect of the present disclosure, there is provided a computer-readable storage medium having stored thereon a program for executing the above-described method. In another aspect of the present disclosure, there is provided a UE configured to perform the method. In another aspect of the present disclosure, there is provided a device configured to control the UE configured to perform the method. In another aspect of the present disclosure, there is provided a method of receiving a signal by a ba