# US 11,115,091 B2 · Channel state information feedback and receiving methods, transmit-end device and receive-end device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,115,091 B2 - Document ID: US11115091B2 - Status: Granted - Kind: B2 - Application number: 16/728,388 - Filed: 2019-12-27 - Published: 2020-04-30 - Granted: 2021-09-07 - Earliest claimed: 2017-06-28 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Huangping Jin; Peng Jiang; Xiaoyan Bi; Wei Han - Web page: https://patentgrep.com/patent/US11115091B2 ## CPC - H04B 7/0478: {Special codebook structures directed to feedback optimisation} - H04L 1/0029: {Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling (power control H04W52/04)} - H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]} - H04B 7/10: Polarisation diversity; Directional diversity - H04L 1/0026: {Transmission of channel quality indication} - H04L 5/14: Two-way operation using the same type of signal, i.e. duplex - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Embodiments of this application disclose channel state information feedback and receiving methods, a transmit-end device and a receive-end device, and relate to the field of communications technologies. The method includes: generating and sending, by a transmit-end device, codebook indication information of K transport layers, where K is an integer greater than or equal to 2; the codebook indication information includes: L pieces of beam information used by the K transport layers, and indication information used to indicate beam information associated with each of the K transport layers; L is an integer greater than or equal to 2, and a quantity of pieces of beam information associated with at least one of the K transport layers is less than L. Implementing a channel state information feedback and receiving technology provided in this application helps reduce feedback overheads of channel state information. ## Claims ### Claim 1 A transmit-end device, comprising: a processor, configured to generate codebook indication information of K transport layers, wherein K is an integer greater than or equal to 2; wherein the codebook indication information comprises: L pieces of beam information used by the K transport layers, beam superposition coefficient information of at least one of m transport layers, and indication information used to indicate beam information associated with each of the K transport layers; wherein L is an integer greater than or equal to 2, and a quantity of pieces of beam information associated with at least one of the K transport layers is less than L to reduce a quantity of beam superposition coefficients that are fed back; and a transceiver, configured to send the codebook indication information. ### Claim 2 (depends on 1) The transmit-end device according to claim 1, wherein in m transport layers of the K transport layers, a quantity of pieces of beam information associated with each layer is greater than or equal to 2, and m is an integer greater than or equal to 1 and less than K; and in K−m transport layers in the K transport layers other than the m transport layers, a quantity of pieces of beam information associated with each layer is equal to 1. ### Claim 3 (depends on 2) The transmit-end device according to claim 2, wherein for the m transport layers, the quantity of pieces of beam information associated with each layer is equal to L; or a quantity of pieces of beam information associated with at least one of the m transport layers is equal to L, and a quantity of pieces of beam information associated with each of other transport layers is less than L. ### Claim 4 (depends on 2) The transmit-end device according to claim 2, wherein for each of the K−m transport layers, beam information associated with the transport layer is beam information of a strongest beam of the transport layer. ### Claim 5 (depends on 2) The transmit-end device according to claim 2, wherein for one of the K−m transport layers, a polarization phase difference for constructing a precoding vector of the transport layer to be associated with a beam superposition coefficient of one of the m transport layers. ### Claim 6 (depends on 5) The transmit-end device according to claim 5, wherein a polarization phase difference for constructing a precoding vector of each of the K−m transport layers is associated with a beam superposition coefficient of the same transport layer in the m transport layers. ### Claim 7 (depends on 2) The transmit-end device according to claim 2, wherein the codebook indication information further comprises: polarization phase difference information for constructing precoding vectors of the K−m transport layers. ### Claim 8 (depends on 1) The transmit-end device according to claim 1, wherein a quantity of pieces of beam information associated with each of the K transport layers is greater than or equal to 2. ### Claim 9 A method, comprising: generating codebook indication information of K transport layers, wherein K is an integer greater than or equal to 2; wherein the codebook indication information comprises: L pieces of beam information used by the K transport layers, beam superposition coefficient information of at least one of m transport layers, and indication information used to indicate beam information associated with each of the K transport layers; wherein L is an integer greater than or equal to 2, and a quantity of pieces of beam information associated with at least one of the K transport layers is less than L to reduce a quantity of beam superposition coefficients that are fed back; and sending the codebook indication information. ### Claim 10 (depends on 9) The method of claim 9, wherein in m transport layers of the K transport layers, a quantity of pieces of beam information associated with each layer is greater than or equal to 2, and m is an integer greater than or equal to 1 and less than K; and in K−m transport layers in the K transport layers other than the m transport layers, a quantity of pieces of beam information associated with each layer is equal to 1. ### Claim 11 (depends on 10) The method of claim 10, wherein for the m transport layers, the quantity of pieces of beam information associated with each layer is equal to L; or a quantity of pieces of beam information associated with at least one of the m transport layers is equal to L, and a quantity of pieces of beam information associated with each of other transport layers is less than L. ### Claim 12 (depends on 10) The method of claim 10, wherein for each of the K−m transport layers, beam information associated with the transport layer is beam information of a strongest beam of the transport layer. ### Claim 13 (depends on 10) The method of claim 10, wherein for one of the K−m transport layers, a polarization phase difference for constructing a precoding vector of the transport layer to be associated with a beam superposition coefficient of one of the m transport layers. ### Claim 14 (depends on 13) The method of claim 13, wherein a polarization phase difference for constructing a precoding vector of each of the K−m transport layers is associated with a beam superposition coefficient of the same transport layer in the m transport layers. ### Claim 15 (depends on 10) The method of claim 10, wherein the codebook indication information further comprises: polarization phase difference information for constructing precoding vectors of the K−m transport layers. ### Claim 16 (depends on 9) The method of claim 9, wherein a quantity of pieces of beam information associated with each of the K transport layers is greater than or equal to 21. ### Claim 17 A non-transitory machine-readable medium having instructions stored therein, which when executed by a processor, cause the processor to perform operations, the operations comprising: generating codebook indication information of K transport layers, wherein K is an integer greater than or equal to 2; wherein the codebook indication information comprises: L pieces of beam information used by the K transport layers, beam superposition coefficient information of at least one of m transport layers, and indication information used to indicate beam information associated with each of the K transport layers; wherein L is an integer greater than or equal to 2, and a quantity of pieces of beam information associated with at least one of the K transport layers is less than L to reduce a quantity of beam superposition coefficients that are fed back; and sending the codebook indication information. ### Claim 18 (depends on 17) The machine-readable medium of claim 17, wherein in m transport layers of the K transport layers, a quantity of pieces of beam information associated with each layer is greater than or equal to 2, and m is an integer greater than or equal to 1 and less than K; and in K−m transport layers in the K transport layers other than the m transport layers, a quantity of pieces of beam information associated with each layer is equal to 1. ### Claim 19 (depends on 18) The machine-readable medium of claim 18, wherein for the m transport layers, the quantity of pieces of beam information associated with each layer is equal to L; or a quantity of pieces of beam information associated with at least one of the m transport layers is equal to L, and a quantity of pieces of beam information associated with each of other transport layers is less than L. ### Claim 20 (depends on 18) The machine-readable medium of claim 18, wherein for each of the K−m transport layers, beam information associated with the transport layer is beam information of a strongest beam of the transport layer.