# US 12,192,991 B2 · Beamforming assistance > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,192,991 B2 - Document ID: US12192991B2 - Status: Granted - Kind: B2 - Application number: 17/280,536 - Filed: 2019-09-25 - Published: 2022-02-03 - Granted: 2025-01-07 - Earliest claimed: 2018-09-28 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget LM Ericsson (publ) - Inventors: Mattias Frenne; Claes Tidestav - Web page: https://patentgrep.com/patent/US12192991B2 ## CPC - H04W 72/1268: of uplink data flows - H04B 7/0413: MIMO systems - H04B 7/0628: {Diversity capabilities} - H04B 7/0862: {receiver computing weights based on information from the transmitter} - H04B 7/088: {using beam selection} - 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) - H04B: TRANSMISSION ## Abstract The invention refers to a method in a user equipment, UE (100) of a wireless communications network, wherein the communications network provides a radio connection of the UE to a base station, gNB (200), comprising the steps of sending the gNB (200) UE capability information indicative of multiple input multiple output, MIMO, capabilities, receiving from the gNB (200) configuration information for a transmission configuration indication, TCI, state configuration associated to spatial quasi co-location, QCL, assistance, and receiving from the gNB (200) physical download control channel, PDCCH, information to determine PDSCH scheduling referring to the TCI state; the invention further refers to a corresponding method in a gNB, and to a corresponding UE and gNB. ## Claims ### Claim 1 A method in a user equipment (UE) of a wireless communications network, wherein the wireless communications network provides a radio connection of the UE to a base station comprising: sending, to the base station, UE capability information indicative of multiple input multiple output (MIMO) related capabilities, the UE capability information being indicative of whether the UE needs to be configured with quasi colocation (QCL) Type D type of QCL by: indicating a number of channel state information reference signals (CSI-RS) repetitions per resource set, the indicated number of repetitions indicating whether the UE needs to be configured with QCL Type D type; receiving, from the base station, configuration information for a transmission configuration indication (TCI) state configuration associated to spatial quasi colocation assistance, the spatial QCL assistance being a QCL Type D source reference signal (RS) information indicative of whether a first and a second signal is to be received at the UE with the same beam or spatial filter; and receiving, from the base station, physical download control channel (PDCCH) information to determine a physical download shared channel (PDSCH) scheduling referring to the TCI state. ### Claim 2 (depends on 1) The method of claim 1, wherein the PDCCH information comprises a download control indicator (DCI) containing information referring to a previously configured TCI state. ### Claim 3 (depends on 1) The method of claim 1, wherein the first signal is a channel state information reference signal (CSI-RS) signal and the second signal is a PDSCH De-Modulation Reference Signal (DMRS) signal. ### Claim 4 (depends on 1) The method of claim 1, wherein the UE capability information is indicative of information that the UE does not support receive (RX) beam sweeping using CSI-RS resource with repetition of the same transmit (TX) beam. ### Claim 5 (depends on 1) The method of claim 1, wherein the UE capability information is indicative of information that the UE does not support multiple beam switches in a slot. ### Claim 6 (depends on 1) The method of claim 1, wherein the UE receives physical download shared channel (PDSCH) signals using a receiver setting associated with the reception of the QCL Type D source RS as indicated by the TCI state. ### Claim 7 (depends on 6) The method of claim 6, wherein the receiver setting comprises a spatial RX filter setting. ### Claim 8 (depends on 1) The method of claim 1, wherein the UE capabilities comprise an indication that the UE does not need to be configured with QCL Type D type of QCL. ### Claim 9 (depends on 8) The method of claim 8, where the indication is valid for one or a plurality of defined frequency ranges. ### Claim 10 (depends on 1) The method claim 1, wherein the TCI state configuration is performed by radio resource control (RRC) signaling. ### Claim 11 A user equipment (UE) comprising a processor configured to cause the UE to: send, to a base station of a wireless communication network, UE capability information indicative of multiple input multiple output (MIMO) related capabilities, the UE capability information being indicative of whether the UE needs to be configured with quasi colocation (QCL) Type D type of QCL by: indicating a number of channel state information reference signals (CSI-RS) repetitions per resource set, the indicated number of repetitions indicating whether the UE needs to be configured with QCL Type D type; receive, from the base station, configuration information for transmission configuration indication (TCI) state configuration associated to spatial quasi co-location (QCL) assistance, the spatial QCL assistance being a QCL Type D source reference signal (RS) information indicative of whether a first and a second signal is to be received at the UE with the same beam or spatial filter; and receive, from the base station, physical download control channel (PDCCH) information, to determine a PDSCH scheduling referring to the TCI state. ### Claim 12 A method in a base station of a wireless communications network, wherein the wireless communications network provides a radio connection of a user equipment (UE) to the base station, the method comprising: receiving, from the UE, UE capability information indicative of multiple input multiple output (MIMO) related capabilities, the UE capability information being indicative of whether the UE needs to be configured with quasi colocation (QCL) Type D type of QCL by: indicating a number of channel state information reference signals (CSI-RS) repetitions per resource set, the indicated number of repetitions indicating whether the UE needs to be configured with QCL Type D type; determining that the UE needs spatial quasi co-location (QCL) assistance, the spatial QCL assistance being a QCL Type D source RS information indicative of whether a CSI-RS and a PDSCH DMRS signal is to be received with the same beam or spatial filter; and sending, to the UE, configuration information for a transmission configuration indication (TCI) state configuration associated to spatial QCL assistance. ### Claim 13 (depends on 12) The method of claim 12, further comprising detecting, from the UE capability information, that the UE does not support receiving (RX) beam sweeping using CSI-RS resource with repetition of the same transmission (TX) beam. ### Claim 14 (depends on 12) The method of claim 12, further comprising detecting, from the UE capability information, that the UE does not support multiple beam switches in a slot. ### Claim 15 (depends on 12) The method of claim 12, further comprising transmitting physical download shared channel (PDSCH) signals associated to the TCI state. ### Claim 16 (depends on 15) The method of claim 15, wherein the TCI state is indicative to using RS as source QCL Type C and Type D. ### Claim 17 (depends on 12) The method of claim 12, wherein the UE capabilities comprise an indication that the UE does not need to be configured with QCL Type D type of QCL. ### Claim 18 (depends on 17) The method of claim 17, where the indication is valid for one or a plurality of defined frequency ranges. ### Claim 19 (depends on 12) The method of claim 12, wherein the TCI state configuration is performed by RRC signaling. ### Claim 20 A base station comprising a processor configured to cause the base station to: receive, from a user equipment (UE), UE capability information indicative of multiple input multiple output (MIMO) capabilities, the UE capability information being indicative of whether the UE needs to be configured with quasi colocation (QCL) Type D type of QCL by: indicating a number of channel state information reference signals (CSI-RS) repetitions per resource set, the indicated number of repetitions indicating whether the UE needs to be configured with QCL Type D type; determine that UE needs spatial QCL assistance; and send, to the UE, configuration information for a transmission configuration indication (TCI) state configuration associated to spatial quasi co-location (QCL) assistance, the spatial QCL assistance being a QCL Type D source RS information indicative of whether a CSI-RS and a PDSCH DMRS signal is to be received with the same beam or spatial filter.