# US 12,191,960 B2 · Terminal and base station of wireless communication system, and methods executed by terminal and base station > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,191,960 B2 - Document ID: US12191960B2 - Status: Granted - Kind: B2 - Application number: 18/011,447 - Filed: 2021-04-09 - Published: 2023-08-03 - Granted: 2025-01-07 - Earliest claimed: 2020-06-19 - Assignees: Ntt Docomo, Inc. - Applicants: Ntt Docomo, Inc. - Inventors: Xin Wang; Xiaolin Hou; Anxin Li; Lan Chen - Web page: https://patentgrep.com/patent/US12191960B2 ## CPC - H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]} - H04B 7/0658: {Feedback reduction} - H04B 7/0417: Feedback systems - H04B: TRANSMISSION ## Abstract The present invention provides a terminal and a base station in a wireless communication system, and methods executed by the terminal and the base station. The terminal comprises: a processing unit, configured to perform characteristic domain transformation on a channel matrix to obtain a transformed channel characteristic and compress the transformed channel characteristic to obtain a compressed channel characteristic; and a transmitting unit, configured to transmit the compressed channel characteristic, as feedback information, to the base station. ## Claims ### Claim 1 A terminal comprising: a processor configured to perform a characteristic domain transformation on a channel matrix to obtain transformed channel characteristics; compress the transformed channel characteristics to obtain compressed channel characteristics; a transmitting unit configured to transmit the compressed channel characteristics as feedback information to a base station, wherein the processor is configured to: convolve the transformed channel characteristics to obtain convolved transformed channel characteristics, and compress the convolved transformed channel characteristics to obtain compressed channel characteristics. ### Claim 2 (depends on 1) The terminal according to claim 1, wherein the processor is configured to perform the characteristic domain transformation on the channel matrix by using a first fully connected network. ### Claim 3 (depends on 2) The terminal according to claim 2, wherein the transformed channel characteristics and the channel matrix have a same size. ### Claim 4 (depends on 2) The terminal according to claim 2, wherein a size of the transformed channel characteristics is smaller than a size of the channel matrix. ### Claim 5 (depends on 1) The terminal according to claim 1, wherein the processor compresses the transformed channel characteristics using a second fully connected network. ### Claim 6 A base station comprising: a receiving unit configured to receive feedback information from a terminal, wherein the feedback information is obtained by the terminal through the following operations: performing a characteristic domain transformation on a channel matrix to obtain transformed channel characteristics, convolving the transformed channel characteristics to obtain convolved transformed channel characteristics, compressing the convolved transformed channel characteristics to obtain compressed channel characteristics, and taking the compressed channel characteristics as the feedback information; a processor configured to: decompress the feedback information to obtain decompressed feedback information; perform an inverse characteristic domain transformation on the decompressed feedback information to obtain channel state information feedback. ### Claim 7 (depends on 6) The base station according to claim 6, wherein the processor is configured to decompress the feedback information by using a third fully connected network to obtain decompressed feedback information. ### Claim 8 (depends on 6) The base station according to claim 6, wherein before performing the inverse characteristic domain transformation on the decompressed feedback information, the processor is further configured to: perform a denoising processing on the decompressed feedback information. ### Claim 9 (depends on 6) The base station according to claim 6, wherein the processor is configured to perform the inverse characteristic domain transformation on the decompressed feedback information by using a fourth fully connected network to obtain channel state information feedback. ### Claim 10 A method executed by a base station, comprising: receiving feedback information from a terminal, wherein the feedback information is obtained by the terminal through the following operations: performing a characteristic domain transformation on a channel matrix to obtain transformed channel characteristics, convolving the transformed channel characteristics to obtain convolved transformed channel characteristics, compressing the convolved transformed channel characteristics to obtain compressed channel characteristics, and taking the compressed channel characteristics as the feedback information; decompressing the feedback information to obtain decompressed feedback information; performing an inverse characteristic domain transformation on the decompressed feedback information to obtain channel state information feedback. ### Claim 11 (depends on 10) The method according to claim 10, wherein decompressing the feedback information to obtain decompressed feedback information comprises: decompressing the feedback information by using a third fully connected network to obtain decompressed feedback information. ### Claim 12 (depends on 10) The method according to claim 10, further comprising: before performing the inverse characteristic domain transformation on the decompressed feedback information, performing a denoising processing on the decompressed feedback information. ### Claim 13 (depends on 10) The method according to claim 10, wherein performing an inverse characteristic domain transformation on the decompressed feedback information to obtain channel state information feedback comprises: performing the inverse characteristic domain transformation on the decompressed feedback information by using a fourth fully connected network to obtain channel state information feedback.