# US 12,225,565 B2 · Methods and apparatus of spatial relation switching in new radio system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,225,565 B2 - Document ID: US12225565B2 - Status: Granted - Kind: B2 - Application number: 17/171,075 - Filed: 2021-02-09 - Published: 2021-08-12 - Granted: 2025-02-11 - Earliest claimed: 2020-02-12 - Assignees: Mediatek Singapore Ptd. Ltd. - Applicants: MediaTek Singapore Pte. Ltd. - Inventors: Zhixun Tang; Tsang-Wei Yu; Hsuan-Li Lin - Web page: https://patentgrep.com/patent/US12225565B2 ## CPC - H04W 72/12: Wireless traffic scheduling - H04W 72/53: based on regulatory allocation policies - H04B 7/0617: {for beam forming} - H04B 7/088: {using beam selection} - 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 25/0226: {sounding signals per se} - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 72/046: {the resource being in the space domain, e.g. beams} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 80/02: Data link layer protocols - H04W 16/28: using beam steering - H04W 36/00: Hand-off or reselection arrangements - H04W 72/04: Wireless resource allocation - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Methods and apparatus of performing spatial relation switching in new radio (NR) system is proposed. In one embodiment, a configured spatial relation of an uplink channel is Quasi-Co-Located (QCLed) to the source of a downlink reference signal (DL RS). In this QCLed relation, the active spatial relation switching shall differentiate known and unknown situation. In another embodiment, the configured spatial relation is QCLed to the root source of an uplink sounding reference signal (SRS). In this QCLed relation, the active spatial relation switching does not need to differentiate known and unknown situation. The proposed spatial relation switching shall apply for physical uplink shared channel (PUSCH), physical uplink control channel (PUCCH), and SRS transmission. ## Claims ### Claim 1 A method comprising: receiving a spatial relation configuration to switch to a target spatial relation for an uplink channel by a user equipment (UE) in a new radio (NR) network, wherein the spatial relation configuration indicates a spatial filter of the uplink channel is Quasi-Co-Located (QCLed) with one or more spatial filters of one or more downlink reference signals (DL RSs); determining whether the target spatial relation is known or unknown based on a list of predefined conditions, wherein the target spatial relation is known when the spatial relation configuration was received within a predefined period of a previous transmission for beam measurement or reporting for the QCLed DL RS of the target spatial relation, the UE has sent at least one measurement report for the QCLed DL RS of the target spatial relation, the target spatial relation remain detectable during a spatial relation switching period, and a signal quality of the QCLed DL RS of the target spatial relation is better than a predefined threshold; and switching to the target spatial relation directly when the target spatial relation is known, otherwise performing spatial filter training for a QCLed DL RS when the target spatial relation is unknown. ### Claim 2 (depends on 1) The method of claim 1, wherein the UE performs layer-1 measurements and reporting based on configured measurement objects (MO) such that the target spatial relation is known before receiving the spatial relation configuration. ### Claim 3 (depends on 1) The method of claim 1, wherein the UE transmits uplink signals using a previous selected spatial filter while performing the spatial training. ### Claim 4 (depends on 1) The method of claim 1, wherein the spatial relation configuration is provided via a media-access-control (MAC) based activation or via a downlink control information (DCI) or via an RRC signalling. ### Claim 5 (depends on 1) The method of claim 1, wherein the uplink channel is for a physical uplink control channel (PUCCH) transmission. ### Claim 6 (depends on 1) The method of claim 1, wherein the uplink channel is for a physical uplink shared channel (PUSCH) transmission. ### Claim 7 (depends on 1) The method of claim 1, wherein the uplink channel is for an uplink sounding reference signal (SRS) transmission. ### Claim 8 A User Equipment (UE) comprising: a receiver that receives a spatial relation configuration to switch to a target spatial relation for an uplink channel in a new radio (NR) network, wherein the spatial relation configuration indicates a spatial filter of the uplink channel is Quasi-Co-Located (QCLed) with one or more spatial filters of one or more downlink reference signals (DL RSs); a control circuit that determines whether the target spatial relation is known or unknown based on a list of predefined conditions, wherein the target spatial relation is known when the spatial relation configuration was received within a predefined period of a previous transmission for beam measurement or reporting for the QCLed DL RS of the target spatial relation, the UE has sent at least one measurement report for the QCLed DL RS of the target spatial relation, the target spatial relation remain detectable during a spatial relation switching period, and a signal quality of the QCLed DL RS of the target spatial relation is better than a predefined threshold; and a beam management handling circuit that switches to the target spatial relation directly when the target spatial relation is known, otherwise performs spatial filter training for a QCLed DL RS when the target spatial relation is unknown. ### Claim 9 (depends on 8) The UE of claim 8, wherein the UE performs layer-1 measurements and reporting based on configured measurement objects (MO) such that the target spatial relation is known before receiving the spatial relation configuration. ### Claim 10 (depends on 8) The UE of claim 8, wherein the UE transmits uplink signals using a previous selected spatial filter while performing the spatial training. ### Claim 11 (depends on 8) The UE of claim 8, wherein the spatial relation configuration is provided via a media-access-control (MAC) based activation or via a downlink control information (DCI) or via an RRC signalling. ### Claim 12 (depends on 8) The UE of claim 8, wherein the uplink channel is for a physical uplink control channel (PUCCH) transmission, or for a physical uplink shared channel (PUSCH) transmission, or for an uplink sounding reference signal (SRS) transmission.