# US 2020/0395984 A1 · Information Feedback Method, User Equipment, And Network Device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0395984 A1 - Document ID: US20200395984A1 - Status: Published application - Kind: A1 - Application number: 17/005,921 - Filed: 2020-08-28 - Published: 2020-12-17 - Earliest claimed: 2016-11-04 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Huangping JIN; Wei HAN; Peng SHANG; Xiaoyan BI - Web page: https://patentgrep.com/patent/US20200395984A1 ## CPC - H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]} - H04B 7/0417: Feedback systems - H04B 7/063: {Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection} - H04B 7/0639: {Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection} - H04B 7/0658: {Feedback reduction} - H04B: TRANSMISSION ## Abstract The present disclosure relates to channel state information (CSI) receiving methods and apparatus. One example method includes transmitting a pilot, and receiving feedback of W1 and W2 for each transport layer which are determined based on the pilot, where W1 and W2 are used to form a combined vector W for each transport layer, W=W1×W2, W1=[b1 b2 . . . bK], bi is a vector to be combined, W2=[X1 X2 . . . XK]T, Xi is a weighting coefficient corresponding to bi, K is a quantity of vectors in W1, K is a positive integer which is greater than 1, i is an integer, 1≤i≤K, and quantities of bits for feeding back at least two elements in W2 are different from each other. ## Claims ### Claim 1 A network device, comprising: at least one processor; and a memory coupled to the at least one processor, the memory configured to store at least one computer instruction which, when executed by the at least one processor, causes the at least one processor to perform: transmitting a pilot; and receiving feedback of W1 and W2 for each transport layer which are determined based on the pilot, wherein W1 and W2 are used to form a combined vector W for each transport layer, W=W1×W2, W1=[b1 b2 . . . bK], bi is a vector to be combined, W2=[X1 X2 . . . XK]T, Xi is a weighting coefficient corresponding to bi, K is a quantity of vectors in W1, K is a positive integer which is greater than 1, i is an integer, 1≤i≤K, and quantities of bits for feeding back at least two elements in W2 are different from each other. ### Claim 2 (depends on 1) The network device according to claim 1, wherein an Nth element in W2 is a normalization reference element, a quantity of bits of the Nth element is zero, and quantities of bits for at least two elements except the Nth element in W2 are different from each other. ### Claim 3 (depends on 2) The network device according to claim 2, wherein Xi is a complex number, and when i≠N, a quantity of bits of Xi is positively correlated to an amplitude of Xi. ### Claim 4 (depends on 2) The network device according to claim 2, wherein a value of N is a value pre-agreed on between a user equipment (UE) and the network device. ### Claim 5 (depends on 1) The network device according to claim 1, wherein Xi is a complex number, and a quantity of bits of Xi is a sum of a quantity of bits of an amplitude of Xi and a quantity of bits of a phase of Xi. ### Claim 6 (depends on 1) The network device according to claim 1, wherein bi is selected from a vector set. ### Claim 7 A channel state information (CSI) receiving method, comprising: transmitting a pilot; and receiving feedback of W1 and W2 for each transport layer which are determined based on the pilot, wherein W1 and W2 are used to form a combined vector W for each transport layer, W=W1×W2, W1=[b1 b2 . . . bK], bi is a vector to be combined, W2=[X1 X2 . . . XK]T, Xi is a weighting coefficient corresponding to bi, K is a quantity of vectors in W1, K is a positive integer which is greater than 1, i is an integer, 1≤i≤K, and quantities of bits for feeding back at least two elements in W2 are different from each other. ### Claim 8 (depends on 7) The method according to claim 7, wherein an Nth element in W2 is a normalization reference element, a quantity of bits of the Nth element is zero, and quantities of bits for at least two elements except the Nth element in W2 are different from each other. ### Claim 9 (depends on 8) The method according to claim 8, wherein Xi is a complex number, and when i≠N, a quantity of bits of Xi is positively correlated to an amplitude of Xi. ### Claim 10 (depends on 8) The method according to claim 8, wherein a value of N is a value pre-agreed on between a user equipment (UE) and a network device. ### Claim 11 (depends on 7) The method according to claim 7, wherein Xi is a complex number, and a quantity of bits of Xi is a sum of a quantity of bits of an amplitude of Xi and a quantity of bits of a phase of Xi. ### Claim 12 (depends on 7) The method according to claim 7, wherein bi is selected from a vector set. ### Claim 13 A non-transitory computer readable storage medium, configured to store a computer program instruction which, when executed by at least one processor, cause the at least one processor to perform: transmitting a pilot; and receiving feedback of W1 and W2 for each transport layer which are determined based on the pilot, wherein W1 and W2 are used to form a combined vector W for each transport layer, W=W1×W2, W1=[b1 b2 . . . bK], bi is a vector to be combined, W2=[X1 X2 . . . XK]T, Xi is a weighting coefficient corresponding to bi K is a quantity of vectors in W1, K is a positive integer which is greater than 1, i is an integer, 1≤i≤K, and quantities of bits for feeding back at least two elements in W2 are different from each other. ### Claim 14 (depends on 13) The medium according to claim 13, wherein an Nth element in W2 is a normalization reference element, a quantity of bits of the Nth element is zero, and quantities of bits for at least two elements except the Nth element in W2 are different from each other. ### Claim 15 (depends on 14) The medium according to claim 14, wherein Xi is a complex number, and when i≠N, a quantity of bits of Xi is positively correlated to an amplitude of Xi. ### Claim 16 (depends on 14) The medium according to claim 14, wherein a value of N is a value pre-agreed on between a user equipment (UE) and a network device. ### Claim 17 (depends on 13) The medium according to claim 13, wherein Xi is a complex number, and a quantity of bits of Xi is a sum of a quantity of bits of an amplitude of Xi and quantity of bits of a phase of Xi. ### Claim 18 (depends on 13) The medium according to claim 13, wherein bi is selected from a vector set. ### Claim 19 A network device, comprising: a transmitter, the transmitter configured to transmit a pilot; and a receiver, the receiver configured to receive feedback of W1 and W2 for each transport layer which are determined based on the pilot, wherein W1 and W2 are used to form a combined vector W for each transport layer, W=W1×W2, W1=[b1 b2 . . . bK], bi is a vector to be combined, W2=[X1 X2 . . . XK]T, Xi is a weighting coefficient corresponding to bi, K is a quantity of vectors in W1, K is a positive integer which is greater than 1, i is an integer, 1≤i≤K, and quantities of bits for feeding back at least two elements in W2 are different from each other. ### Claim 20 (depends on 19) The network device according to claim 19, wherein an Nth element in W2 is a normalization reference element, a quantity of bits of the Nth element is zero, and quantities of bits for at least two elements except the Nth element in W2 are different from each other. ### Claim 21 (depends on 20) The network device according to claim 20, wherein Xi is a complex number, and when i≠N, a quantity of bits of Xi is positively correlated to an amplitude of Xi. ### Claim 22 (depends on 20) The network device according to claim 20, wherein a value of N is a value pre-agreed on between a user equipment (UE) and the network device. ### Claim 23 (depends on 19) The network device according to claim 19, wherein Xi is a complex number, and a quantity of bits of Xi is a sum of a quantity of bits of an amplitude of Xi and a quantity of bits of a phase of Xi. ### Claim 24 (depends on 19) The network device according to claim 19, wherein bi is selected from a vector set.