# US 12,015,464 B2 · Channel measurement method and communications apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,015,464 B2 - Document ID: US12015464B2 - Status: Granted - Kind: B2 - Application number: 17/541,997 - Filed: 2021-12-03 - Published: 2022-03-24 - Granted: 2024-06-18 - Earliest claimed: 2019-06-06 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Xiang Ren; Xiaohan Wang; Huangping Jin; Xiaoyan Bi - Web page: https://patentgrep.com/patent/US12015464B2 ## CPC - H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]} - 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)} - H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting - H04B 7/0479: {for multi-dimensional arrays, e.g. horizontal or vertical pre-distortion matrix index [PMI]} - H04B 7/0481: {using subset selection of codebooks} - H04B 7/0639: {Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection} - H04L 5/0057: {Physical resource allocation for CQI} - H04L 25/0222: {Estimation of channel variability, e.g. coherence bandwidth, coherence time, fading frequency} - H04L 25/0224: {using sounding signals} - H04L 25/03898: {codebook-based design (selection of codebook or precoding matrix for MIMO diversity systems H04B7/0456)} - H04B 17/30: of propagation channels - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A channel measurement method and a communications apparatus, the method including generating, by a terminal device, first indication information, where the first indication information indicates one or more component features of a time-varying feature, and further indicates a weighting coefficient of each component feature of the one or more component features, and the one or more component features and the weighting coefficient of each component feature represent the time-varying feature of a channel, and sending, by the terminal device, the first indication information to a network device. ## Claims ### Claim 1 A channel measurement method, comprising: generating, by a terminal device, first indication information, wherein the first indication information indicates one or more component features of a time-varying feature, and further indicates a weighting coefficient of each component feature of the one or more component features, wherein the weighting coefficient of each component feature corresponds to at least one domain vector selected to construct a precoding vector, wherein a quantity of the domain vectors of the at least one domain vector is preconfigured by a network device using second indication information sent from the network device to the terminal device, and wherein the one or more component features and the weighting coefficient of each component feature represent the time-varying feature of a channel using a weighted sum of the one or more domain vectors; and sending, by the terminal device, the first indication information to the network device. ### Claim 2 (depends on 1) The method according to claim 1, wherein the time-varying feature is determined based on reference signals received a plurality of times. ### Claim 3 (depends on 1) The method according to claim 1, wherein the first indication information indicates an index of a time domain vector corresponding to each component feature, in a predefined codebook, of the one or more component features. ### Claim 4 (depends on 3) The method according to claim 3, wherein at least two component features of the one or more component features are determined based on different codebooks. ### Claim 5 (depends on 1) The method according to claim 1, wherein the one or more component features are determined based on one or more predefined codebooks, wherein the one or more codebooks are obtained from a predefined codebook set, and wherein each codebook in the codebook set corresponds to a value of one or more of a measurement duration, a pilot time-domain density, a quantity of pilot transmissions, or a pilot transmission periodicity. ### Claim 6 (depends on 1) The method according to claim 1, wherein a component feature of the one or more component features of the time-varying feature is a Doppler shift, and wherein the weighting coefficient of the component feature is a Doppler coefficient. ### Claim 7 A channel measurement method, comprising: preconfiguring, by a network device, using second indication information sent from the network device to a terminal device, a quantity of domain vectors of at least one domain vector; receiving, by the network device, first indication information, wherein the first indication information indicates one or more component features of a time-varying feature and further indicates a weighting coefficient of each component feature of the one or more component features, wherein the weighting coefficient of each component feature corresponds to the at least one domain vector selected to construct a precoding vector, and wherein the one or more component features and the weighting coefficient of each component feature represent the time-varying feature of a channel using a weighted sum of the one or more domain vectors; and determining, by the network device based on the first indication information, the one or more component features and the weighting coefficient of each component feature. ### Claim 8 (depends on 7) The method according to claim 7, wherein the time-varying feature is determined by a terminal device based on reference signals received a plurality of times. ### Claim 9 (depends on 7) The method according to claim 7, wherein the first indication information indicate an index of a time domain vector corresponding to each component feature, in a predefined codebook, of the one or more component features. ### Claim 10 (depends on 9) The method according to claim 9, wherein at least two component features of the one or more component features are determined based on different codebooks. ### Claim 11 (depends on 7) The method according to claim 7, wherein the one or more component features are determined based on one or more predefined codebooks, wherein the one or more codebooks are obtained from a predefined codebook set, and wherein each codebook in the codebook set corresponds to a value of one or more of a measurement duration, a pilot time-domain density, a quantity of pilot transmissions, or a pilot transmission periodicity. ### Claim 12 (depends on 7) The method according to claim 7, wherein a component feature of the one or more component features of the time-varying feature is a Doppler shift, and wherein the weighting coefficient of the component feature is a Doppler coefficient. ### Claim 13 A communications apparatus, comprising: at least one processor; a non-transitory memory configured storing a computer program for execution by the at least one processor, wherein the computer program includes instructions to: generate first indication information, wherein the first indication information indicates one or more component features of a time-varying feature and further indicates a weighting coefficient of each component feature of the one or more component features, wherein the weighting coefficient of each component feature corresponds to at least one domain vector selected to construct a precoding vector, wherein a quantity of the domain vectors of the at least one domain vector is preconfigured by a network device using second indication information sent from the network device to the communications apparatus, and wherein the one or more component features and the weighting coefficient of each component feature represent the time-varying feature of a channel using a weighted sum of the one or more domain vectors; and send the first indication information. ### Claim 14 (depends on 13) The apparatus according to claim 13, wherein the time-varying feature is determined based on reference signals received a plurality of times. ### Claim 15 (depends on 13) The apparatus according to claim 13, wherein the first indication information indicates an index of a time domain vector corresponding to each component feature, in a predefined codebook, of the one or more component features. ### Claim 16 (depends on 15) The apparatus according to claim 15, wherein at least two component features of the one or more component features are determined based on different codebooks. ### Claim 17 (depends on 13) The apparatus according to claim 13, wherein the one or more component features are determined based on one or more predefined codebooks, wherein the one or more codebooks are obtained from a predefined codebook set, and wherein each codebook in the codebook set corresponds to a value of one or more of a measurement duration, a pilot time-domain density, a quantity of pilot transmissions, or a pilot transmission periodicity. ### Claim 18 (depends on 13) The apparatus according to claim 13, wherein a component feature of the one or more component features of the time-varying feature is a Doppler shift, and wherein the weighting coefficient of the component feature is a Doppler coefficient. ### Claim 19 A communications apparatus, comprising: at least one processor; a non-transitory memory configured storing a computer program for execution by the at least one processor, wherein the computer program includes instructions to: preconfigure, using second indication information sent from the communications apparatus to a terminal device, a quantity of domain vectors of at least one domain vector; receive first indication information, wherein the first indication information indicates one or more component features of a time-varying feature and further indicates a weighting coefficient of each component feature, wherein the weighting coefficient of each component feature corresponds to the at least one domain vector selected to construct a precoding vector, and wherein the one or more component features and the weighting coefficient of each component feature represent the time-varying feature of a channel using a weighted sum of the one or more domain vectors; and determine, based on the first indication information, the one or more component features and the weighting coefficient of each component feature. ### Claim 20 (depends on 19) The apparatus according to claim 19, wherein the time-varying feature is determined by a terminal device based on reference signals received a plurality of times. ### Claim 21 (depends on 19) The apparatus according to claim 19, wherein the first indication information indicates an index of a time domain vector corresponding to each component feature, in a predefined codebook, of the one or more component features. ### Claim 22 (depends on 21) The apparatus according to claim 21, wherein at least two component features of the one or more component features are determined based on different codebooks. ### Claim 23 (depends on 19) The apparatus according to claim 19, wherein the one or more component features are determined based on one or more predefined codebooks, wherein the one or more codebooks are obtained from a predefined codebook set, and wherein each codebook in the codebook set corresponds to a value of one or more of a measurement duration, a pilot time-domain density, a quantity of pilot transmissions, or a pilot transmission periodicity. ### Claim 24 (depends on 19) The apparatus according to claim 19, wherein a component feature of the one or more component features of the time-varying feature is a Doppler shift, and wherein the weighting coefficient of the component feature is a Doppler coefficient.