# US 2025/0096969 A1 · Temporal domain precoding configuration for wireless communications > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0096969 A1 - Document ID: US20250096969A1 - Status: Published application - Kind: A1 - Application number: 18/728,047 - Filed: 2022-04-01 - Published: 2025-03-20 - Earliest claimed: 2022-04-01 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Liangming WU; Jing DAI; Wei XI; Wanshi CHEN; Peter GAAL; Hao XU - Web page: https://patentgrep.com/patent/US20250096969A1 ## CPC - H04L 1/0026: {Transmission of channel quality indication} - 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 1/06: using space diversity - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 25/0222: {Estimation of channel variability, e.g. coherence bandwidth, coherence time, fading frequency} - H04L 25/0224: {using sounding signals} - H04L 25/03343: {Arrangements at the transmitter end} - H04L 27/2615: {Reduction thereof using coding} - H04L 27/2636: {with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Methods, systems, and devices for wireless communications are described. The method may include a first network node receiving a configuration message for a report by the first network node of parameters for a temporal domain precoder. The configuration message may indicate a range of Doppler frequencies, a resolution associated with the range of Doppler frequencies, or a quantity of the parameters to be reported. The first network node may estimate a communications channel and select one or more bins within the range of Doppler frequencies based on the channel estimation. For each selected bin, the first network node may determine a corresponding discrete Fourier transform (DFT) vector and transmit a report indicating the corresponding DFT vector. ## Claims ### Claim 1 A method for wireless communications at a first network node, comprising: receiving a configuration message for a report by the first network node of parameters for a temporal domain precoder, wherein the configuration message indicates one or more of a range of Doppler frequencies, a resolution associated with the range of Doppler frequencies, or a quantity of the parameters for the first network node to report; estimating a communications channel between the first network node and a second network node based at least in part on receiving a plurality of reference signals; selecting, based at least in part on the quantity of the parameters for the first network node to report and estimating the communications channel, one or more quantized frequencies within the range of Doppler frequencies; determining, for each selected quantized frequency within the range of Doppler frequencies, a corresponding discrete Fourier transform vector, wherein the parameters for the temporal domain precoder comprise the corresponding discrete Fourier transform vector for each selected quantized frequency within the range of Doppler frequencies; and transmitting the report comprising the parameters for the temporal domain precoder. ### Claim 2 (depends on 1) The method of claim 1, wherein selecting the one or more quantized frequencies within the range of Doppler frequencies comprises: determining, for each directional beam of a set of directional beams or for each power delay profile of a set of power delay profiles, one or more Doppler frequencies that correspond to respective received power values that are above a threshold; and selecting, for each directional beam of the set or for each power delay profile of the set, the one or more quantized frequencies based at least on the one or more determined Doppler frequencies being within frequency ranges that include the one or more quantized frequencies. ### Claim 3 (depends on 1) The method of claim 1, wherein receiving the plurality of reference signals comprises: receiving the plurality of reference signals according to a periodicity and a quantity of reference signal occasions, wherein the quantity of reference signal occasions is greater than one. ### Claim 4 (depends on 3) The method of claim 3, further comprising: bundling the plurality of reference signals, wherein estimating the communications channel is based at least in part on the bundling. ### Claim 5 (depends on 3) The method of claim 3, wherein the configuration message further comprises an indication of the periodicity and the quantity of reference signal occasions. ### Claim 6 (depends on 3) The method of claim 3, further comprising: determining a mapping between one or both of the periodicity and the quantity of reference signal occasions and at least one of the range of Doppler frequencies, the resolution within the range of Doppler frequencies, or a quantity of quantized frequencies within the range of Doppler frequencies, wherein the configuration message indicates one or more of the range of Doppler frequencies, the resolution associated with the range of Doppler frequencies, or the quantity of the parameters for the first network node to report based at least in part on indicating one or both of the periodicity and the quantity of reference signal occasions. ### Claim 7 (depends on 1) The method of claim 1, wherein the corresponding discrete Fourier transform vectors each comprise a discrete Fourier transform basis representative of a quantized frequency of the one or more quantized frequencies. ### Claim 8 (depends on 1) The method of claim 1, further comprising: determining a respective Doppler coefficient for each of the corresponding discrete Fourier transform vectors, wherein the report further comprises the respective Doppler coefficients. ### Claim 9 (depends on 1) The method of claim 1, further comprising: determining a highest Doppler frequency and a lowest Doppler frequency based at least in part on estimating the communications channel, wherein the highest Doppler frequency and the lowest Doppler frequency are within the range of Doppler frequencies, and wherein the report further comprises an indication of the highest Doppler frequency and the lowest Doppler frequency. ### Claim 10 (depends on 1) The method of claim 1, further comprising: receiving a medium access control-control element comprising an indication of a highest Doppler frequency and a lowest Doppler frequency, wherein the highest Doppler frequency and the lowest Doppler frequency are within the range of Doppler frequencies. ### Claim 11 (depends on 1) The method of claim 1, wherein: the range of Doppler frequencies is divided into a plurality of portions each corresponding to a respective quantized frequency; and a quantity of the portions and a size of the portions are based at least in part on the range of Doppler frequencies and the resolution associated with the range of Doppler frequencies. ### Claim 12 (depends on 1) The method of claim 1, wherein the report comprises a channel state information report and the configuration message is included as part of a channel state information report configuration message. ### Claim 13 (depends on 1) The method of claim 1, wherein the plurality of reference signals comprises a plurality of channel state information reference signals or a plurality of tracking reference signals. ### Claim 14 A method for wireless communications at a second network node, comprising: transmitting a configuration message for a report by a first network node of parameters for a temporal domain precoder, wherein the configuration message indicates one or more of a range of Doppler frequencies, a resolution associated with the range of Doppler frequencies, or a quantity of the parameters for the first network node to report; transmitting a plurality of reference signals; and receiving, based at least in part on transmitting the plurality of reference signals, the report comprising the parameters for the temporal domain precoder, wherein the parameters for the temporal domain precoder comprise a corresponding discrete Fourier transform vector for each quantized frequency of one or more quantized frequencies within the range of Doppler frequencies. ### Claim 15 (depends on 14) The method of claim 14, wherein transmitting the plurality of reference signals comprises: transmitting the plurality of reference signals according to a periodicity and a quantity of reference signal occasions, wherein the quantity of reference signal occasions is greater than one. ### Claim 16 (depends on 15) The method of claim 15, wherein the configuration message further comprises an indication of the periodicity and the quantity of reference signal occasions. ### Claim 17 (depends on 15) The method of claim 15, wherein: one or both of the periodicity and the quantity of reference signal occasions maps to at least one of the range of Doppler frequencies, the resolution within the range of Doppler frequencies, or a quantity of quantized frequencies within the range of Doppler frequencies; and the configuration message indicates one or more of the range of Doppler frequencies, the resolution associated with the range of Doppler frequencies, or the quantity of the parameters for the first network node to report based at least in part on indicating one or both of the periodicity and the quantity of reference signal occasions. ### Claim 18 (depends on 14) The method of claim 14, wherein the corresponding discrete Fourier transform vectors each comprise a discrete Fourier transform basis representative of a quantized frequency of the one or more quantized frequencies. ### Claim 19 (depends on 14) The method of claim 14, wherein the report further comprises a respective Doppler coefficient for each of the corresponding discrete Fourier transform vectors. ### Claim 20 (depends on 14) The method of claim 14, wherein the report further comprises an indication of a highest Doppler frequency and a lowest Doppler frequency, the highest Doppler frequency and the lowest Doppler frequency are within the range of Doppler frequencies. ### Claim 21 (depends on 14) The method of claim 14, further comprising: transmitting a medium access control-control element comprising an indication of a highest Doppler frequency and a lowest Doppler frequency, wherein the highest Doppler frequency and the lowest Doppler frequency are within the range of Doppler frequencies. ### Claim 22 (depends on 14) The method of claim 14, wherein: the range of Doppler frequencies is divided into a plurality of portions each corresponding to a respective quantized frequency; and a quantity of the portions and a size of the portions are based at least in part on the range of Doppler frequencies and the resolution associated with the range of Doppler frequencies. ### Claim 23 (depends on 14) The method of claim 14, wherein the report comprises a channel state information report and the configuration message is included as part of a channel state information report configuration message. ### Claim 24 (depends on 14) The method of claim 14, wherein the plurality of reference signals comprises a plurality of channel state information reference signals or a plurality of tracking reference signals. ### Claim 25 An apparatus for wireless communications at a first network node, comprising: memory; a transceiver; and at least one processor of the first network node, the at least one processor coupled with the memory and the transceiver, and the at least one processor configured to cause the apparatus to: receive, via the transceiver, a configuration message for a report by the first network node of parameters for a temporal domain precoder, wherein the configuration message indicates one or more of a range of Doppler frequencies, a resolution associated with the range of Doppler frequencies, or a quantity of the parameters for the first network node to report; estimate a communications channel between the first network node and a second network node based at least in part on receiving, via the transceiver, a plurality of reference signals; select, based at least in part on the quantity of the parameters for the first network node to report and estimating the communications channel, one or more quantized frequencies within the range of Doppler frequencies; determine, for each selected quantized frequency within the range of Doppler frequencies, a corresponding discrete Fourier transform vector, wherein the parameters for the temporal domain precoder comprise the corresponding discrete Fourier transform vector for each selected quantized frequency within the range of Doppler frequencies; and transmit, via the transceiver, the report comprising the parameters for the temporal domain precoder. ### Claim 26 (depends on 25) The apparatus of claim 25, wherein, to select the one or more quantized frequencies within the range of Doppler frequencies, the at least one processor is configured to cause the apparatus to: determine, for each directional beam of a set of directional beams or for each power delay profile of a set of power delay profiles, one or more Doppler frequencies that correspond to respective received power values that are above a threshold; and select, for each directional beam of the set or for each power delay profile of the set, the one or more quantized frequencies based at least on the one or more determined Doppler frequencies being within frequency ranges that include the one or more quantized frequencies. ### Claim 27 (depends on 25) The apparatus of claim 25, wherein the corresponding discrete Fourier transform vectors each comprise a discrete Fourier transform basis representative of a quantized frequency of the one or more quantized frequencies. ### Claim 28 (depends on 25) The apparatus of claim 25, wherein the at least on processor is further configured to cause the apparatus to: determine a respective Doppler coefficient for each of the corresponding discrete Fourier transform vectors, wherein the report further comprises the respective Doppler coefficients. ### Claim 29 An apparatus for wireless communications at a second network node, comprising: memory; a transceiver; and at least one processor of the second network node, the at least one processor coupled with the memory and the transceiver, and the at least one processor configured to cause the apparatus to: transmit, via the transceiver, a configuration message for a report by a first network node of parameters for a temporal domain precoder, wherein the configuration message indicates one or more of a range of Doppler frequencies, a resolution associated with the range of Doppler frequencies, or a quantity of the parameters for the first network node to report; transmit, via the transceiver, a plurality of reference signals; and receive, via the transceiver and based at least in part on transmitting the plurality of reference signals, the report comprising the parameters for the temporal domain precoder, wherein the parameters for the temporal domain precoder comprise a corresponding discrete Fourier transform vector for each quantized frequency of one or more quantized frequencies within the range of Doppler frequencies. ### Claim 30 (depends on 29) The apparatus of claim 29, wherein the corresponding discrete Fourier transform vectors each comprise a discrete Fourier transform basis representative of a quantized frequency of the one or more quantized frequencies.