# US 2023/0276458 A1 · Method and apparatus for transmitting or receiving wireless signal in wireless communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0276458 A1 - Document ID: US20230276458A1 - Status: Published application - Kind: A1 - Application number: 18/018,023 - Filed: 2021-08-04 - Published: 2023-08-31 - Earliest claimed: 2020-08-05 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Youngdae LEE; Suckchel YANG; Seonwook KIM; Joonkui AHN - Web page: https://patentgrep.com/patent/US20230276458A1 ## CPC - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04W 72/232: the control data signalling from the physical layer, e.g. DCI signalling - H04L 1/0061: {Error detection codes} - H04L 1/08: by repeating transmission, e.g. Verdan system {(H04L1/1858 and H04L1/189 take precedence)} - H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ] - H04L 1/1854: {Scheduling and prioritising arrangements} - H04L 1/1896: {ARQ related signaling} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04L 2001/0093: {Point-to-multipoint} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A terminal according to an embodiment of the present disclosure may: monitor a PDCCH in a search space for a specific multicast service to be received so as to receive downlink control information (DCI) in which a CRC is scrambled by a specific RNTI; repeatedly receive a TB related to the specific multicast service on a multicast frequency part on the basis of the DCI; and transmit, after repetition of the TB, an HARQ-ACK indicating a result of decoding of the TB through a PUCCH resource indicated by the DCI, wherein the specific RNTI is a group-RNTI (G-RNTI) associated with the specific multicast service that the terminal is to receive. ## Claims ### Claim 1 A method of receiving a signal by a user equipment (UE) in a wireless communication system, the method comprising: monitoring a physical downlink control channel (PDCCH) in a search space for a specific multicast service that the UE desires to receive; receiving downlink control information (DCI) having a cyclic redundancy check (CRC) scrambled with a specific radio network temporary identifier (RNTI) as a result of monitoring the PDCCH; repeatedly receiving a transport block (TB) related to the specific multicast service in a multicast frequency part based on the DCI; and transmitting a hybrid automatic repeat request acknowledgement (HARQ-ACK) indicating a decoding result of the TB on a physical uplink control channel (PUCCH) resource indicated by the DCI after the repetition of the TB, wherein the specific RNTI is a group-RNTI (G-RNTI) associated with the specific multicast service that the UE desires to receive. ### Claim 2 (depends on 1) The method of claim 1, wherein the DCI includes at least one of information on a number of times that the TB is repeated or information on the multicast frequency part. ### Claim 3 (depends on 1) The method of claim 1, wherein the search space is located in an active frequency part of the UE. ### Claim 4 (depends on 3) The method of claim 3, wherein the active frequency part of the UE is different from the multicast frequency part. ### Claim 5 (depends on 4) The method of claim 4, wherein after completing the repetition of the TB in the multicast frequency part, the UE is configured to return to the active frequency part of the UE and transmit the HARQ-ACK. ### Claim 6 (depends on 1) The method of claim 1, wherein the search space is associated with a service identifier (ID) of the specific multicast service that the UE desires to receive. ### Claim 7 (depends on 1) The method of claim 1, wherein the search space is selected based on a service identifier (ID) of the specific multicast service that the UE desires to receive from among a plurality of search spaces. ### Claim 8 (depends on 1) The method of claim 1, wherein the TB is a TB on a traffic channel for the specific multicast service. ### Claim 9 (depends on 1) The method of claim 1, wherein based on a failure of decoding the TB even after repeating the TB by a number of times indicated by the DCI, the UE is configured to the HARQ-ACK to a negative acknowledgement (NACK). ### Claim 10 (depends on 1) A computer-readable storage medium having stored thereon a program for executing the method of claim 1. ### Claim 11 A user equipment (UE) configured to receive a signal in a wireless communication system, the UE comprising: a transceiver; and a processor configured to control the transceiver to: monitor a physical downlink control channel (PDCCH) in a search space for a specific multicast service that the UE desires to receive; receive downlink control information (DCI) having a cyclic redundancy check (CRC) scrambled with a specific radio network temporary identifier (RNTI) as a result of monitoring the PDCCH; repeatedly receive a transport block (TB) related to the specific multicast service in a multicast frequency part based on the DCI; and transmit a hybrid automatic repeat request acknowledgement (HARQ-ACK) indicating a decoding result of the TB on a physical uplink control channel (PUCCH) resource indicated by the DCI after the repetition of the TB, wherein the specific RNTI is a group-RNTI (G-RNTI) associated with the specific multicast service that the UE desires to receive. ### Claim at position 12 12-13. (canceled) ### Claim 14 A base station configured to transmit a signal in a wireless communication system, the base station comprising: a transceiver; and a processor configured to: generate downlink control information (DCI) having a cyclic redundancy check (CRC) scrambled with a specific radio network temporary identifier (RNTI); control the transceiver to transmit a physical downlink control channel (PDCCH) carrying the DCI in a search space for a specific multicast service that the UE desires to receive; control the transceiver to repeatedly transmit a transport block (TB) related to the specific multicast service in a multicast frequency part based on the DCI; and control the transceiver to receive a hybrid automatic repeat request acknowledgement (HARQ-ACK) indicating a decoding result of the TB by the UE on a physical uplink control channel (PUCCH) resource indicated by the DCI after the repetition of the TB, wherein the specific RNTI is a group-RNTI (G-RNTI) associated with the specific multicast service that the UE desires to receive.