# US 12,193,025 B2 · Method and device for transmitting/receiving downlink channel from multiple transmission/reception points 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 12,193,025 B2 - Document ID: US12193025B2 - Status: Granted - Kind: B2 - Application number: 17/788,504 - Filed: 2021-02-09 - Published: 2023-02-16 - Granted: 2025-01-07 - Earliest claimed: 2020-02-11 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Jiwon Kang; Hyungtae Kim - Web page: https://patentgrep.com/patent/US12193025B2 ## CPC - H04W 52/242: {taking into account path loss} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 1/08: by repeating transmission, e.g. Verdan system {(H04L1/1858 and H04L1/189 take precedence)} - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04W 52/42: in systems with time, space, frequency or polarisation diversity - H04W 72/1273: of downlink data flows - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - Y02D 30/70: in wireless communication networks - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract Disclosed are a method and device for transmitting/receiving a downlink channel from multiple transmission/reception points in a wireless communication system. A method for a terminal to receive a downlink channel in a wireless communication system according to an embodiment of the present disclosure comprises the steps of: receiving a downlink control channel on the basis of two or more transmission configuration indicator (TCI) states associated with one or more control resource sets (CORESETs); and receiving a downlink data channel on the basis of the two or more TCI states associated with one or more CORESETs, on the basis of TCI information not being included in downlink control information (DCI) received through the downlink control channel, wherein the two or more TCI states may be mapped to the downlink data channel on the basis of a prescribed mapping scheme. ## Claims ### Claim 1 A method performed by a terminal in a wireless communication system, the method comprising: receiving a physical downlink control channel (PDCCH), based on two transmission configuration indicator (TCI) states indicated for related to a control resource set (CORESET); and based on i) the terminal being configured with both a scheme associated with two TCI states for the PDCCH and a scheme associated with two TCI states for a physical downlink shared channel (PDSCH), ii) a time offset between a reception of a downlink control information (DCI) and the PDSCH scheduled based on the DCI being equal to or greater than a predetermined threshold, and iii) the DCI received through the PDCCH not including a TCI field, receiving the PDSCH based on two TCI states which are identical to the two TCI states indicated for the CORESET. ### Claim 2 (depends on 1) The method of claim 1, wherein: two or more TCI states are configured for one or more CORESETs, and one or more TCI states are configured for each of the one or more CORESETs. ### Claim 3 (depends on 1) The method of claim 1, wherein: the DCI is DCI format 1_0. ### Claim 4 (depends on 1) The method of claim 1, wherein: the two TCI states are indicated by a medium access control-control element (MAC-CE) for the CORESET. ### Claim 5 (depends on 2) The method of claim 2, wherein: at most one TCI state is configured for a CORESET, among the one or more CORESETS, related to at least one of CORESET 0, a common search space, a search space related to a beam failure recovery request (BFRQ), or a search space related to a physical random access channel (PRACH). ### Claim 6 (depends on 2) The method of claim 2, wherein: the two or more TCI states includes a plurality of TCI states configured for a plurality of CORESETs that are paired. ### Claim 7 (depends on 6) The method of claim 6, wherein: a mapping relationship between the plurality of TCI states configured for the plurality of CORESETs and a plurality of transmission occasions (TOs) of a PDSCH scheduled through the plurality of CORESETs is pre-configured through at least one of a higher layer signaling, medium access control-control element (MAC-CE), or DCI, or a mapping relationship between the plurality of TCI states configured for the plurality of CORESETs and a plurality of TOs of a PDSCH scheduled through the plurality of CORESETs is determined based on a pre-defined criterion. ### Claim 8 (depends on 7) The method of claim 7, wherein: the pre-defined criterion includes that the plurality of TCI states configured for the plurality of CORESETs are mapped to a plurality of TOs of a PDSCH scheduled through the plurality of CORESETs, based on at least one of an order of configuration of the plurality of CORESETs that are paired, an order of CORESET identifier of the plurality of CORESETs that are paired. ### Claim 9 (depends on 8) The method of claim 8, wherein: the two or more TCI states are mapped sequentially and cyclically in an ascending order of index of a plurality of TOs of a PDSCH, the plurality of TOs of the PDSCH are grouped into a plurality of TO groups, and the two or more TCI states are mapped sequentially in an ascending order of index of the TO groups, or the plurality of TOs of the PDSCH are grouped into a plurality of TO groups, and for each TO group, the two or more TCI states are mapped sequentially and cyclically in an ascending order of index of the TO groups. ### Claim 10 (depends on 1) The method of claim 1, wherein: the TCI state is related to at least one quasi co-location reference signal (QCL RS). ### Claim 11 A terminal configured to operate in a wireless communication system, the terminal comprising: at least one transceiver; and at least one processor connected to the at least one transceiver, wherein the at least one processor is configured to: receive, through the at least one transceiver, a physical downlink control channel (PDCCH), based on two transmission configuration indicator (TCI) states indicated for a control resource set (CORESET); and based on i) the terminal being configured with both a scheme associated with two TCI states for the PDCCH and a scheme associated with two TCI states for a physical downlink shared channel (PDSCH), i ii) a time offset between a reception of a downlink control information (DCI) and the PDSCH scheduled based on the DCI being equal to or greater than a predetermined threshold, and iii) the DCI received through the PDCCH not including a TCI field, receive, through the at least one transceiver, the PDSCH based on two TCI states which are identical to the two TCI states indicated for the CORESET. ### Claim 12 A method performed by a base station in a wireless communication system, the method comprising: transmitting, to a terminal, a physical downlink control channel (PDCCH) based on two transmission configuration indicator (TCI) states indicated for a control resource set (CORESET); and based on i) the terminal being configured with both scheme associated with two TCI states for the PDCCH and a scheme associated with two TCI states for a physical downlink shared channel (PDSCH), ii) a time offset between a reception of a downlink control information (DCI) and the PDSCH scheduled based on the DCI being equal to or greater than a predetermined threshold, and iii) the DCI transmitted through the PDCCH not including a TCI field, transmitting the PDSCH based on two TCI states which are identical to the two TCI states indicated for the CORESET.