# US 2023/0155653 A1 · Channel state information reporting for partial bands > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0155653 A1 - Document ID: US20230155653A1 - Status: Published application - Kind: A1 - Application number: 17/916,781 - Filed: 2020-05-11 - Published: 2023-05-18 - Earliest claimed: 2020-05-11 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Chenxi HAO; Yu ZHANG; Hao XU; Liangming WU; Kangqi LIU - Web page: https://patentgrep.com/patent/US20230155653A1 ## CPC - H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting - H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]} - H04B 7/0602: {using antenna switching (H04B7/0686 takes precedence; antenna beam directivity switching H01Q3/24)} - 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)} - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 72/04: Wireless resource allocation - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a configuration message from a base station, and the configuration message may include an indication of one or more partial bands for channel state information reporting. Each partial band of the one or more partial bands may be less than a system bandwidth and include a plurality of frequency domain units associated with a precoder. The UE may select one or more antenna ports for each partial band of the one or more partial bands based on the configuration message and calculate channel state information including a linear combination of the selected one or more antenna ports for each partial band. The UE may transmit the channel state information including an indication of the selected antenna ports and linear combination coefficients for each partial band of the one or more partial bands ## Claims ### Claim 1 A method for wireless communication at a user equipment (UE), comprising: receiving from a base station a configuration message comprising an indication of one or more partial bands for channel state information reporting, wherein each partial band of the one or more partial bands is less than a system bandwidth and comprises a plurality of frequency domain units associated with a precoder; selecting one or more antenna ports for each partial band of the one or more partial bands based at least in part on the configuration message; calculating channel state information comprising a linear combination of the selected one or more antenna ports for each partial band, based at least in part on receiving the configuration message; and transmitting the channel state information comprising at least an indication of the selected antenna ports and linear combination coefficients for each partial band of the one or more partial bands. ### Claim 2 (depends on 1) The method of claim 1, wherein the antenna ports comprise channel state information reference signal (CSI-RS) ports, and: selecting the one or more antenna ports comprises selecting a subset of a total number of antenna ports for each partial band of the one or more partial bands. ### Claim 3 (depends on 2) The method of claim 2, wherein a same subset of one or more CSI-RS ports is selected for each partial band of the one or more partial bands. ### Claim 4 (depends on 1) The method of claim 1, wherein: calculating the channel state information comprises separately precoding each partial band of the one or more partial bands. ### Claim 5 (depends on 1) The method of claim 1, wherein the indication of one or more partial bands for channel state reporting comprises one or more of a numerical quantity of partial bands for which the UE is to perform channel state measurement, or a partial band size for which the UE is to perform channel state measurement, or a ratio of partial band size to frequency domain unit size. ### Claim 6 (depends on 5) The method of claim 5, further comprising: transmitting to the base station a capability message indicating a numerical quality of partial bands for which the UE is capable of performing channel measurement, wherein the configuration message is based at least in part on the capability message. ### Claim 7 (depends on 5) The method of claim 5, wherein the indication of one or more partial bands is dependent on an indication of a numerical quantity of antenna ports to select for each partial band of the one or more partial bands, or a numerical quantity of total antenna ports, and selecting the one or more antenna ports for each partial band is based on the indicated numerical quantity. ### Claim 8 (depends on 1) The method of claim 1, wherein: the antenna ports comprise channel state information reference signal (CSI-RS) ports and the configuration message further comprises a joint indication of partial bands and a numerical quantity of the CSI-RS ports; and selecting the one or more antenna ports for each partial band is based on the joint indication. ### Claim 9 (depends on 8) The method of claim 8, wherein the joint indication comprises one or more of a number of partial bands, a partial band size, or a ratio of partial bands to frequency unit size; and one or more of a number of total CSI-RS ports or a number of CSI-RS ports to be selected for each partial band. ### Claim 10 (depends on 1) The method of claim 1, further comprising: transmitting to the base station a report of the one or more antenna ports selected for each partial band of the one or more partial bands, wherein the report of the one or more antenna ports selected for each partial band comprises an indication of a first set of antenna ports common to all partial bands of the one or more partial bands and, for each partial band of the one or more partial bands, an indication of a second set of antenna ports independently selected for that partial band, wherein the second set of antenna ports for each partial band is from the first set of antenna ports. ### Claim 11 (depends on 1) The method of claim 1, further comprising: receiving from the base station a configuration of a size of the first set of antenna ports and a size of the second set of antenna ports. ### Claim 12 (depends on 1) The method of claim 1, further comprising: transmitting to the base station a report of a resource selection for the channel state measurement for each partial band of the one or more partial bands. ### Claim 13 (depends on 1) The method of claim 1, further comprising: receiving, from the base station, a configuration of frequency domain restriction for channel measurement; and determining that a frequency domain restriction for channel measurement is in place based at least in part on the configuration of frequency domain restriction for channel measurement, wherein calculating the channel information for each partial band of the one or more partial bands comprises restricting the channel state measurement to non-zero power channel state information reference signals within each partial band. ### Claim 14 (depends on 1) The method of claim 1, further comprising: receiving, from the base station, a configuration of frequency domain restriction for interference measurement; and determining that a frequency domain restriction for interference measurement is in place based at least in part on the configuration of frequency domain restriction for channel measurement, wherein performing interference measurement for each partial band of the one or more partial bands comprises restricting the interference measurement to zero or non-zero interference measurement resources within each partial band. ### Claim 15 (depends on 1) The method of claim 1, wherein a frequency domain unit of the plurality of frequency domain units corresponds to a subband size for channel quality indicator (CQI) reporting. ### Claim 16 A method for wireless communication at a base station comprising: transmitting to a user equipment (UE) a configuration message comprising an indication of one or more partial bands for channel state information reporting, wherein each partial band of the one or more partial bands is less than a system bandwidth and comprises a plurality of frequency domain units associated with a precoder; receiving channel state information comprising an indication of antenna ports and linear combination coefficients for each partial band of the one or more partial bands based at least in part on transmitting the configuration message and the channel state measurement; and communicating with the UE based at least in part on receiving the channel state information for each partial band of the one or more partial bands. ### Claim 17 (depends on 16) The method of claim 16, wherein the indication of one or more partial bands for channel state reporting comprises one or more of a numerical quantity of partial bands for which the UE is to perform channel state measurement, or a partial band size for which the UE is to perform channel state measurement, or a ratio of partial band size to frequency domain unit size. ### Claim 18 (depends on 17) The method of claim 17, wherein the indication of one or more partial bands is dependent on an indication of a numerical quantity of antenna ports to select for each partial band of the one or more partial bands, or a numerical quantity of total antenna ports, and selecting the one or more antenna ports for each partial band is based on the indicated numerical quantity. ### Claim 19 (depends on 16) The method of claim 16, further comprising: receiving a capability message from the UE indicating a numerical quality of partial bands for which the UE is capable of performing channel measurement, wherein the configuration message is based at least in part on the capability message. ### Claim 20 (depends on 16) The method of claim 16, wherein: the antenna ports comprise channel state information reference signal (CSI-RS) ports and the configuration message further comprises a joint indication of partial bands and a numerical quantity of the CSI-RS ports; and the one or more antenna ports for each partial band are selected based at least in part on the join indication. ### Claim 21 (depends on 20) The method of claim 20, wherein the joint indication comprises one or more of: a number of partial bands, a partial band size, or a ratio of partial bands to frequency unit size; and one or more of a number of total CSI-RS ports or a number of CSI-RS ports to be selected for each partial band. ### Claim 22 (depends on 16) The method of claim 16, further comprising: receiving a report from the UE of one or more antenna ports selected for each partial band of the one or more partial bands, wherein the report of the one or more antenna ports selected for each partial band comprises an indication of a first set of antenna ports common to all partial bands of the one or more partial bands and, for each partial band of the one or more partial bands, an indication of a second set of antenna ports independently selected for that partial band, wherein the second set of antenna ports for each partial band is from the first set of antenna ports. ### Claim 23 (depends on 16) The method of claim 16, further comprising: transmitting to the UE a configuration of a size of the first set of antenna ports and a size of the second set of antenna ports. ### Claim 24 (depends on 16) The method of claim 16, further comprising: receiving from the UE a report of a resource selection for the channel state measurement for each partial band of the one or more partial bands. ### Claim 25 (depends on 16) The method of claim 16, further comprising: transmitting, to the UE, a configuration of frequency domain restriction for channel measurement; and receiving the channel state information based on channel measurement of non-zero power channel state information reference signals within each partial band. ### Claim 26 (depends on 16) The method of claim 16, further comprising: transmitting, to the UE, a configuration of frequency domain restriction for interference measurement; and receiving the channel state information based on interference measurement of interference measurement resources within each partial band. ### Claim 27 An apparatus for wireless communication at a user equipment (UE), comprising: a processor, memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: receive from a base station a configuration message comprising an indication of one or more partial bands for channel state information reporting, wherein each partial band of the one or more partial bands is less than a system bandwidth and comprises a plurality of frequency domain units associated with a precoder; select one or more antenna ports for each partial band of the one or more partial bands based at least in part on the configuration message; calculate channel state information comprising a linear combination of the selected one or more antenna ports for each partial band, based at least in part on receiving the configuration message; and transmit the channel state information comprising at least an indication of the selected antenna ports and linear combination coefficients for each partial band of the one or more partial bands. ### Claim 28 (depends on 27) The apparatus of claim 27, wherein the instructions to select the one or more antenna ports are executable by the processor to cause the apparatus to select a subset of a total number of antenna ports for each partial band of the one or more partial bands. ### Claim 29 (depends on 28) The apparatus of claim 28, wherein a same subset of one or more CSI-RS ports is selected for each partial band of the one or more partial bands. ### Claim 30 (depends on 27) The apparatus of claim 27, wherein the instructions to calculate the channel state information comprise instructions executable by the processor to separately precode each partial band of the one or more partial bands. ### Claim at position 31 31-41. (canceled) ### Claim 42 An apparatus for wireless communication at a base station comprising, comprising: a processor, memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: transmit to a user equipment (UE) a configuration message comprising an indication of one or more partial bands for channel state information reporting, wherein each partial band of the one or more partial bands is less than a system bandwidth and comprises a plurality of frequency domain units associated with a precoder; receive channel state information comprising an indication of antenna ports and linear combination coefficients for each partial band of the one or more partial bands based at least in part on transmitting the configuration message and the channel state measurement; and communicate with the UE based at least in part on receiving the channel state information for each partial band of the one or more partial bands. ### Claim 43 (depends on 42) The apparatus of claim 42, wherein the indication of one or more partial bands for channel state reporting comprises one or more of a numerical quantity of partial bands for which the UE is to perform channel state measurement, or a partial band size for which the UE is to perform channel state measurement, or a ratio of partial band size to frequency domain unit size. ### Claim 44 (depends on 43) The apparatus of claim 43, wherein the indication of one or more partial bands is dependent on an indication of a numerical quantity of antenna ports to select for each partial band of the one or more partial bands, or a numerical quantity of total antenna ports, and selecting the one or more antenna ports for each partial band is based on the indicated numerical quantity. ### Claim at position 35 45-52. (canceled) ### Claim 53 An apparatus for wireless communication at a user equipment (UE), comprising: means for receiving from a base station a configuration message comprising an indication of one or more partial bands for channel state information reporting, wherein each partial band of the one or more partial bands is less than a system bandwidth and comprises a plurality of frequency domain units associated with a precoder; means for selecting one or more antenna ports for each partial band of the one or more partial bands based at least in part on the configuration message; means for calculating channel state information comprising a linear combination of the selected one or more antenna ports for each partial band, based at least in part on receiving the configuration message; and means for transmitting the channel state information comprising at least an indication of the selected antenna ports and linear combination coefficients for each partial band of the one or more partial bands. ### Claim 54 (depends on 53) The apparatus of claim 53, wherein the means for selecting the one or more antenna ports comprises means for selecting a subset of a total number of antenna ports for each partial band of the one or more partial bands. ### Claim at position 38 55-104. (canceled)