# US 12,603,746 B2 · Method for transmitting channel state information, and communication node and storage medium > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,603,746 B2 - Document ID: US12603746B2 - Status: Granted - Kind: B2 - Application number: 18/576,090 - Filed: 2022-05-26 - Published: 2024-09-19 - Granted: 2026-04-14 - Earliest claimed: 2021-07-20 - Assignees: Zte Corporation - Applicants: ZTE Corporation - Inventors: Yong Li; Hao Wu; Zhaohua Lu; Yuxin Wang - Web page: https://patentgrep.com/patent/US12603746B2 ## CPC - H04B 7/0478: {Special codebook structures directed to feedback optimisation} - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]} - H04L 1/0026: {Transmission of channel quality indication} - H04L 1/06: using space diversity - H04L 5/00: Arrangements affording multiple use of the transmission path - H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals} - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A method for transmitting channel state information, and a communication node and a storage medium are disclosed. The method may include, receiving configuration information sent by a second communication node; receiving CSI-RS sent by the second communication node according to the configuration information; measuring the CSI-RS to obtain the CSI, and transmitting the CSI to the second communication node; where the CSI may include a precoding matrix; the configuration information is indicative of a number of CSI-RS antenna ports and a number of antenna ports onto which the precoding matrix is expected to be applied; and the number of CSI-RS antenna ports is smaller than the number of antenna ports onto which the precoding matrix is expected to be applied. ## Claims ### Claim 1 A method for transmitting channel state information (CSI), which is applied to a first communication node, the method comprising, receiving configuration information sent by a second communication node; receiving a channel state information reference signal (CSI-RS) sent by the second communication node according to the configuration information; measuring the CSI-RS to obtain the CSI, and transmitting the CSI to the second communication node; wherein the CSI comprises a precoding matrix; the configuration information is indicative of a number of CSI-RS antenna ports and a number of antenna ports onto which the precoding matrix is expected to be applied; and the number of CSI-RS antenna ports is smaller than the number of antenna ports onto which the precoding matrix is expected to be applied. ### Claim 2 (depends on 1) The method as claimed in claim 1, wherein the configuration information is further indicative of a correspondence between the CSI-RS antenna ports and the antenna ports onto which the precoding matrix is expected to be applied. ### Claim 3 (depends on 2) The method as claimed in claim 2, wherein the correspondence between the CSI-RS antenna ports and the antenna ports onto which the precoding matrix is expected to be applied, is indicated by one of following schemes in which, the correspondence between the CSI-RS antenna ports and the antenna ports onto which the precoding matrix is expected to be applied, is indicated by a bitmap, and a bit in the bitmap indicates an antenna port onto which the precoding matrix is expected to be applied, and a specific bit in the bitmaps indicates a CSI-RS antenna port; the correspondence between the CSI-RS antenna ports and the antenna ports onto which the precoding matrix is expected to be applied, is indicated by one integer, and the integer indicates a part of the antenna ports served as the CSI-RS antenna ports among the antenna ports onto which the precoding matrix is expected to be applied; or one correspondence is selected from at least one preset correspondence as the correspondence between the CSI-RS antenna ports and the antenna ports onto which the precoding matrix is expected to be applied. ### Claim 4 (depends on 3) The method as claimed in claim 3, wherein the specific bit is a non-zero bit. ### Claim 5 (depends on 2) The method according to claim 2, wherein the correspondence between the CSI-RS antenna ports and the antenna ports onto which the precoding matrix is expected to be applied, is determined by the number of antenna ports onto which the precoding matrix is expected to be applied and the number of the CSI-RS antenna ports. ### Claim 6 (depends on 1) The method as claimed in claim 1, wherein the configuration information is further indicative of, a correspondence between the CSI-RS antenna ports located in a first dimension in space and the antenna ports located in the first dimension in space onto which the precoding matrix is expected to be applied, and the correspondence between the CSI-RS antenna ports located in a second dimension in space and the antenna ports located in the second dimension in space onto which the precoding matrix is expected to be applied. ### Claim 7 (depends on 2) The method according to claim 2, wherein the configuration information is indicative of: the number K1 of CSI-RS antenna ports located in a first dimension in space, the number K2 of CSI-RS antenna ports located in a second dimension in space, the number N1 of antenna ports located in the first dimension in space onto which the precoding matrix is expected to be applied, and the number N2 of antenna ports located in the second dimension in space onto which the precoding matrix is expected to be applied; wherein each of K1, K2, N1 and N2 is a positive integer. ### Claim 8 (depends on 7) The method as claimed in claim 7, wherein the correspondence between the CSI-RS antenna ports and the antenna ports onto which the precoding matrix is expected to be applied is determined by K1, K2, N1, and N2. ### Claim 9 (depends on 7) The method as claimed in claim 7, wherein the number of CSI-RS antenna ports is K, and the number of antenna ports onto which precoding matrix is expected to be applied is N; and K1, K2, N1 and N2 satisfy either of, K=2*K1*K2, and N=2*N1*N2; or K=2*(K1+K2), and N=2*N1*N2. ### Claim 10 (depends on 1) A communication node, comprising, a processor; wherein the processor is configured to carry out the method as claimed in claim 1, when executing a computer program. ### Claim 11 (depends on 1) A non-transitory computer-readable storage medium storing a computer program which, when executed by a processor, causes the processor to carry out the method as claimed in claim 1. ### Claim 12 A method for transmitting channel state information (CSI), which is applied to a second communication node, the method comprising, transmitting configuration information to a first communication node; transmitting a channel state information reference signal (CSI-RS) to the first communication node; and receiving the CSI sent by the first communication node; wherein the CSI comprises a precoding matrix; the configuration information is indicative of a number of CSI-RS antenna ports and a number of antenna ports onto which the precoding matrix is expected to be applied, and the number of the CSI-RS antenna ports is smaller than the number of antenna ports onto which the precoding matrix is expected to be applied. ### Claim 13 (depends on 12) The method as claimed in claim 12, wherein the configuration information is further indicative of a correspondence between the CSI-RS antenna ports and the antenna ports onto which the precoding matrix is expected to be applied. ### Claim 14 (depends on 13) The method as claimed in claim 13, wherein the correspondence between the CSI-RS antenna ports and the antenna ports onto which the precoding matrix is expected to be applied, is indicated by one of following schemes in which, the correspondence between the CSI-RS antenna ports and the antenna ports onto which the precoding matrix is expected to be applied, is indicated by a bitmap, and a bit in the bitmap indicates an antenna port onto which the precoding matrix is expected to be applied, and a specific bit in the bitmaps indicates a CSI-RS antenna port; the correspondence between the CSI-RS antenna ports and the antenna ports onto which the precoding matrix is expected to be applied, is indicated by one integer, and the integer indicates a part of the antenna ports served as the CSI-RS antenna ports among the antenna ports onto which the precoding matrix is expected to be applied; or one correspondence is selected from at least one preset correspondence as the correspondence between the CSI-RS antenna ports and the antenna ports onto which the precoding matrix is expected to be applied. ### Claim 15 (depends on 14) The method as claimed in claim 14, wherein the specific bit is a non-zero bit. ### Claim 16 (depends on 13) The method according to claim 13, wherein the correspondence between the CSI-RS antenna ports and the antenna ports onto which the precoding matrix is expected to be applied, is determined by the number of antenna ports onto which the precoding matrix is expected to be applied and the number of the CSI-RS antenna ports. ### Claim 17 (depends on 12) The method as claimed in claim 12, wherein the configuration information is further indicative of, a correspondence between the CSI-RS antenna ports located in a first dimension in space and the antenna ports located in the first dimension in space onto which the precoding matrix is expected to be applied, and the correspondence between the CSI-RS antenna ports located in a second dimension in space and the antenna ports located in the second dimension in space onto which the precoding matrix is expected to be applied. ### Claim 18 (depends on 13) The method according to claim 13, wherein the configuration information is indicative of: the number K1 of CSI-RS antenna ports located in a first dimension in space, the number K2 of CSI-RS antenna ports located in a second dimension in space, the number N1 of antenna ports located in the first dimension in space onto which the precoding matrix is expected to be applied, and the number N2 of antenna ports located in the second dimension in space onto which the precoding matrix is expected to be applied; wherein each of K1, K2, N1 and N2 is an positive integer. ### Claim 19 (depends on 18) The method as claimed in claim 18, wherein the correspondence between the CSI-RS antenna ports and the antenna ports onto which the precoding matrix is expected to be applied is determined by K1, K2, N1, and N2. ### Claim 20 (depends on 18) The method as claimed in claim 18, wherein the number of CSI-RS antenna ports is K, and the number of antenna ports onto which precoding matrix is expected to be applied is N; and K1, K2, N1 and N2 satisfy either of, K=2*K1*K2, and N=2*N1*N2; or K=2*(K1+K2), and N=2*N1*N2.