# US 12,225,401 B2 · Systems and methods for UE coordination based CSI feedback > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,225,401 B2 - Document ID: US12225401B2 - Status: Granted - Kind: B2 - Application number: 18/475,466 - Filed: 2023-09-27 - Published: 2024-01-18 - Granted: 2025-02-11 - Earliest claimed: 2023-09-27 - Assignees: Apple Inc. - Applicants: Apple Inc. - Inventors: Yushu Zhang; Chunhai Yao; Chunxuan Ye; Dawei Zhang; Haitong Sun; Hong He; Huaning Niu; Wei Zeng; Weidong Yang - Web page: https://patentgrep.com/patent/US12225401B2 ## CPC - H04B 7/0632: {Channel quality parameters, e.g. channel quality indicator [CQI]} - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04L 1/0026: {Transmission of channel quality indication} - H04L 1/06: using space diversity - 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 5/0057: {Physical resource allocation for CQI} - H04L 2001/0092: {Error control systems characterised by the topology of the transmission link} - H04B: TRANSMISSION - 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) ## Abstract Systems and methods provide user equipment (UE) coordinated channel state information (CSI) measurement and reporting. One or both of a first UE and a second UE may perform CSI measurement, but only the first UE sends a CSI report to a base station. ## Claims ### Claim 1 A method for a base station in a wireless network, the method comprising: receiving a message from a first user equipment (UE) indicating a supported mode for UE coordination based channel state information (CSI) feedback; based on the supported mode, configuring the first UE and one or more second UE for either a first mode wherein both the first UE and the one or more second UE perform CSI measurements to be reported by the first UE or a second mode wherein only the first UE performs the CSI measurements to be reported by the first UE; triggering CSI reporting for the first UE and the one or more second UE in a coordination group; and processing one or more CSI report from the first UE for the first UE and the one or more second UE in the coordination group. ### Claim 2 (depends on 1) The method of claim 1, wherein for the first mode, the method further comprises: configuring one or more CSI report configuration information element (CSI-reportConfig IE) for each of the first UE and the one or more second UE within the coordination group; and triggering the first UE to report for CSI for selected ones of the one or more CSI-reportConfig IE. ### Claim 3 (depends on 2) The method of claim 2, wherein control signaling to trigger the first UE to report the CSI comprises a UE identifier (ID) and a CSI-reportConfig ID for each of the one or more CSI-reportConfig IE to be reported. ### Claim 4 (depends on 2) The method of claim 2, wherein each of the one or more CSI-reportConfig IE comprises a UE identifier (ID), and wherein control signaling to trigger the first UE to report the CSI comprises a CSI-reportConfig ID for each of the one or more CSI-reportConfig IE to be reported. ### Claim 5 (depends on 1) The method of claim 1, wherein triggering the CSI reporting comprises generating a radio resource control (RRC) signal, a media access control (MAC) control element (CE), or downlink control information (DCI) to transmit to the first UE, to transmit separately to the first UE and the one or more second UE, or to transmit to the first UE and the one or more second UE in a group based manner. ### Claim 6 (depends on 1) The method of claim 1, wherein triggering the CSI reporting comprises triggering the UE to report CSI for the first UE and the one or more second UE comprising different numbers of receive (Rx) antennas. ### Claim 7 (depends on 6) The method of claim 6, wherein the different numbers of Rx antennas are determined by a maximum number of downlink (DL) layers reported by each of the first UE and the one or more second UE of the coordination group. ### Claim 8 (depends on 7) The method of claim 7, further comprising selecting the first UE to transmit the one or more CSI report based on determining that the first UE comprises a maximum number of Rx antennas for the coordination group. ### Claim 9 (depends on 8) The method of claim 8, further comprising: configuring UE identifiers (IDs) in a CSI report configuration information element (CSI-reportConfig IE); configuring CSI reference signal (CSI-RS) resources in the CSI-report Config IE; configuring a rank restriction per UE; receiving a first CSI report from the first UE corresponding to the maximum number of Rx antennas; and receiving a second CSI report from the first UE corresponding a smaller number of Rx antennas than the maximum number of Rx antennas. ### Claim 10 (depends on 6) The method of claim 6, further comprising: configuring one or more maximum number of downlink (DL) layers in a CSI report configuration information element (CSI-reportConfig IE), wherein the maximum number of DL layers implies a number of Rx antennas per UE in the coordination group; configuring a rank restriction per the maximum number of DL layers; and receiving a separate CSI report for each configured maximum number of DL layers. ### Claim 11 (depends on 6) The method of claim 6, further comprising: configuring whether a CSI report configuration information element (CSI-reportConfig IE) is to be used for a single UE or multiple UEs within the coordination group; configuring a rank restriction per a maximum number of downlink (DL) layers; and receiving a separate CSI report for each configured maximum number of DL layers. ### Claim 12 A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors of a base station in a wireless network, configure the base station to: receive a message from a first user equipment (UE) indicating a supported mode for UE coordination based channel state information (CSI) feedback; based on the supported mode, configure the first UE and one or more second UE for either a first mode wherein both the first UE and the one or more second UE perform CSI measurements to be reported by the first UE or a second mode wherein only the first UE performs the CSI measurements to be reported by the first UE; trigger CSI reporting for the first UE and the one or more second UE in a coordination group; and process one or more CSI report from the first UE for the first UE and the one or more second UE in the coordination group. ### Claim 13 (depends on 12) The non-transitory computer-readable medium of claim 12, wherein for the first mode, the instructions further configure the base station to: configure one or more CSI report configuration information element (CSI-reportConfig IE) for each of the first UE and the one or more second UE within the coordination group; and trigger the first UE to report for CSI for selected ones of the one or more CSI-reportConfig IE. ### Claim 14 (depends on 13) The non-transitory computer-readable medium of claim 13, wherein control signaling to trigger the first UE to report the CSI comprises a UE identifier (ID) and a CSI-reportConfig ID for each of the one or more CSI-reportConfig IE to be reported. ### Claim 15 (depends on 13) The non-transitory computer-readable medium of claim 13, wherein each of the one or more CSI-reportConfig IE comprises a UE identifier (ID), and wherein control signaling to trigger the first UE to report the CSI comprises a CSI-reportConfig ID for each of the one or more CSI-reportConfig IE to be reported. ### Claim 16 (depends on 12) The non-transitory computer-readable medium of claim 12, wherein to trigger the CSI reporting comprises to generate a radio resource control (RRC) signal, a media access control (MAC) control element (CE), or downlink control information (DCI) to transmit to the first UE, to transmit separately to the first UE and the one or more second UE, or to transmit to the first UE and the one or more second UE in a group based manner. ### Claim 17 An apparatus for a base station in a wireless network, the apparatus comprising: a memory device to store message from a first user equipment (UE) indicating a supported mode for UE coordination based channel state information (CSI) feedback; and one or more processors to: based on the supported mode, configure the first UE and one or more second UE for either a first mode wherein both the first UE and the one or more second UE perform CSI measurements to be reported by the first UE or a second mode wherein only the first UE performs the CSI measurements to be reported by the first UE; trigger CSI reporting for the first UE and the one or more second UE in a coordination group; and process one or more CSI report from the first UE for the first UE and the one or more second UE in the coordination group. ### Claim 18 (depends on 17) The apparatus of claim 17, wherein for the first mode, the one or more processors are configured to: configure one or more CSI report configuration information element (CSI-reportConfig IE) for each of the first UE and the one or more second UE within the coordination group; and trigger the first UE to report for CSI for selected ones of the one or more CSI-reportConfig IE. ### Claim 19 (depends on 18) The apparatus of claim 18, wherein control signaling to trigger the first UE to report the CSI comprises a UE identifier (ID) and a CSI-reportConfig ID for each of the one or more CSI-reportConfig IE to be reported. ### Claim 20 (depends on 18) The apparatus of claim 18, wherein each of the one or more CSI-reportConfig IE comprises a UE identifier (ID), and wherein control signaling to trigger the first UE to report the CSI comprises a CSI-reportConfig ID for each of the one or more CSI-reportConfig IE to be reported.