# US 12,764,560 B2 · Method and device for transmission and reception based on default spatial parameter 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 12,764,560 B2 - Document ID: US12764560B2 - Status: Granted - Kind: B2 - Application number: 18/009,706 - Filed: 2021-07-14 - Published: 2023-07-13 - Granted: 2026-10-13 - Earliest claimed: 2020-07-15 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Hyungtae Kim; Jiwon Kang; Seonwook Kim - Web page: https://patentgrep.com/patent/US12764560B2 ## CPC - H04W 16/28: using beam steering - H04W 72/1273: of downlink data flows - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Disclosed are a method and device for transmission or reception based on a default spatial parameter in a wireless communication system, which may include receiving from the base station configuration information for at least one of a spatial parameter configured for at least one codepoint or a spatial parameter configured for a control resource set (CORESET); receiving downlink control information (DCI) from the base station in a first time unit; and receiving downlink transmission from the base station based on at least one default spatial parameter in a second time unit, and based on the at least one codepoint not including a codepoint that a plurality of spatial parameters are configured, the at least one default spatial parameter may be determined based on at least one of a plurality of spatial parameters configured for the CORESET. ## Claims ### Claim 1 A method comprising: receiving, by a terminal from a base station, at least one of first configuration information related to at least one transmission configuration indicator (TCI) state configured for at least one TCI codepoint or second configuration information related to at least one TCI state configured for at least one control resource set (CORESET); receiving, by the terminal from the base station, in a first time unit, downlink control information (DCI); and receiving, by the terminal from the base station, in a second time unit, a downlink transmission based on a default TCI state, wherein, based on there being no TCI codepoint configured with a plurality of TCI states in an activation command through a medium access control (MAC) control element (CE), and the downlink transmission being a physical downlink shared channel (PDSCH) transmission: the default TCI state is determined based on a first TCI state of a plurality of TCI states indicated for a specific CORESET. ### Claim 2 (depends on 1) The method according to claim 1, wherein: the specific CORESET is a CORESET having a lowest CORESET identifier in a latest time unit. ### Claim 3 (depends on 1) The method according to claim 1, wherein: an offset between the first time unit and the second time unit is less than a predetermined time threshold. ### Claim 4 (depends on 3) The method according to claim 3, wherein: based on the downlink transmission being the PDSCH transmission, the predetermined time threshold is a timeDurationForQCL parameter. ### Claim 5 (depends on 1) The method according to claim 1, wherein: the terminal is configured to perform or has a capability of performing a reception of the DCI through a physical downlink control channel (PDCCH) based on a plurality of TCI states in a single time unit. ### Claim 6 (depends on 1) The method according to claim 1, wherein: the TCI state includes parameters for configuring a quasi co-location (QCL) relationship between at least one downlink reference signal (RS) and at least one demodulation reference signal port of the PDSCH or at least one CSI-RS port. ### Claim 7 (depends on 1) The method according to claim 1, wherein: each of the first time unit and the second time unit is a slot or a symbol defined based on a subcarrier spacing. ### Claim 8 A 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, from a base station through the at least one transceiver, at least one of first configuration information related to at least one transmission configuration indicator (TCI) state configured for at least one TCI codepoint or second configuration information related to at least one TCI state configured for at least one control resource set (CORESET); receive, from the base station through the at least one transceiver, in a first time unit, downlink control information (DCI); and receive, from the base station through the at least one transceiver, in a second time unit, a downlink transmission based on a default TCI state, wherein, based on there being no TCI codepoint configured with a plurality of TCI states in an activation command through a medium access control (MAC) control element (CE), and the downlink transmission being a physical downlink shared channel (PDSCH) transmission: the default TCI state is determined based on a first TCI state of a plurality of TCI states indicated for a specific CORESET. ### Claim 9 A base station 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: transmit, to a terminal through the at least one transceiver, at least one of first configuration information related to at least one transmission configuration indicator (TCI) state configured for at least one TCI codepoint or second configuration information related to at least one TCI state configured for at least one control resource set (CORESET); transmit, to the terminal through the at least one transceiver, in a first time unit, downlink control information (DCI); and transmit, to the terminal through the at least one transceiver, in a second time unit, a downlink transmission based on a default TCI state, wherein, based on there being no TCI codepoint configured with a plurality of TCI states in an activation command through a medium access control (MAC) control element (CE), and the downlink transmission being a physical downlink shared channel (PDSCH) transmission: the default TCI state is determined based on a first TCI state of a plurality of TCI states indicated for a specific CORESET.