# US 2019/0173541 A1 · Data transmission method, sending device, and receiving device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0173541 A1 - Document ID: US20190173541A1 - Status: Published application - Kind: A1 - Application number: 16/273,680 - Filed: 2019-02-12 - Published: 2019-06-06 - Earliest claimed: 2016-08-12 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Jianqin Liu - Web page: https://patentgrep.com/patent/US20190173541A1 ## CPC - H04L 1/0026: {Transmission of channel quality indication} - H04B 7/063: {Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection} - H04B 7/0632: {Channel quality parameters, e.g. channel quality indicator [CQI]} - H04B 7/0634: {Antenna weights or vector/matrix coefficients} - H04L 5/0005: {Time-frequency} - H04L 5/0057: {Physical resource allocation for CQI} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION ## Abstract Embodiments of the present invention relate to the communications field, and provide a data transmission method, a sending device, and a receiving device. Transmission requirements of different subbands can be maximally satisfied, and a system throughput can be improved. The method includes: determining, by a sending device, rank indicators of J (an integer greater than or equal to 1) subbands corresponding to a to-be-transmitted channel, where the rank indicators of the J subbands are not totally the same; determining, by the sending device based on a rank indicator of each of the J subbands, a transmission block size. ## Claims ### Claim 1 A method of data transmission, comprising: determining, by a sending device, rank indicators of J subbands corresponding to a to-be-transmitted channel, wherein at least one of the rank indicators of the J subbands is different than at least another of the rank indicators of the J subbands, and J is an integer greater than or equal to 2; determining, by the sending device based on a rank indicator of each of the J subbands, a transmission block size and a quantity of transmission layers that corresponds to the subband, wherein the transmission block size is a transmission block size corresponding to the J subbands or a transmission block size corresponding to each of the J subbands; mapping, by the sending device based on the rank indicator of each of the J subbands, a transmission block corresponding to the subband to a transmission layer corresponding to the subband; and mapping, by the sending device, data carried on the transmission layer corresponding to the subband to a time-frequency resource for transmission. ### Claim 2 (depends on 1) The method according to claim 1, wherein the method further comprises: sending, by the sending device, first control information indication signaling used to indicate at least one of rank information, precoding matrix information, and modulation and coding information, the rank information comprises the rank indicator of each of the J subbands, the precoding matrix information comprises precoding matrix information of each of the J subbands, and the modulation and coding information comprises modulation and coding information of each of the J subbands. ### Claim 3 (depends on 1) The method according to claim 1, wherein the J subbands are M physical subbands corresponding to the to-be-transmitted channel, and J is equal to M; or the J subbands include at least one group of subbands having a same rank in the M physical subbands, the group of subbands having the same rank are at least two physical subbands whose rank indicators are the same in the M physical subbands, and J is less than M. ### Claim 4 (depends on 1) The method according to claim 1, wherein when the transmission block size is the transmission block size corresponding to each of the J subbands, the determining, by the sending device based on a rank indicator of each of the J subbands, a transmission block size and a quantity of transmission layers that corresponds to the subband comprises: using a rank indicator of an ith subband in the J subbands as a quantity of transmission layers that corresponds to the ith subband, wherein i is an integer greater than or equal to 1 and less than or equal to J; determining, based on the rank indicator of the ith subband, a channel quality indicator CQI corresponding to the ith subband, and determining, based on the CQI corresponding to the ith subband, modulation and coding information corresponding to the ith subband; and determining, based on the quantity of transmission layers that corresponds to the ith subband, the modulation and coding information corresponding to the ith subband, and a quantity of scheduling resource blocks that corresponds to the ith subband, a transmission block size corresponding to the ith subband. ### Claim 5 (depends on 1) The method according to any one of claim 1, wherein when the transmission block size is the transmission block size corresponding to the J subbands, the determining, by the sending device based on a rank indicator of each of the J subbands, a transmission block size and a quantity of transmission layers that corresponds to the subband comprises: using the rank indicator of the ith subband in the J subbands as the quantity of transmission layers that corresponds to the ith subband, wherein i is an integer greater than or equal to 1 and less than or equal to J; and determining, based on the transmission block size corresponding to each of the J subbands, the transmission block size corresponding to the J subbands. ### Claim 6 (depends on 4) The method according to claim 4, wherein the mapping, by the sending device based on the rank indicator of each of the J subbands, a transmission block corresponding to the subband to a transmission layer corresponding to the subband comprises: mapping, based on the quantity of transmission layers that corresponds to the ith subband and a common quantity of code words of the J subbands, a code word corresponding to a transmission block corresponding to the ith subband to a transmission layer corresponding to the ith subband, wherein the common quantity of code words is the common quantity of code words of the J subbands; or mapping, based on the quantity of transmission layers that corresponds to the ith subband and a quantity of code words of the ith subband, a code word corresponding to a transmission block corresponding to the ith subband to a transmission layer corresponding to the ith subband, wherein quantities of code words of the J subbands are not totally the same. ### Claim 7 (depends on 1) The method according to claim 1, wherein the mapping data carried on the transmission layer corresponding to the subband to a time-frequency resource for transmission comprises: mapping, in an order of first frequency domain and then time domain, the data carried on the transmission layer corresponding to the subband. ### Claim 8 (depends on 2) The method according to claim 2, wherein the rank indicators of the J subbands in the first control information indication signaling use a differential manner; and/or the precoding matrix information of the J subbands uses a differential manner; and/or the modulation and coding information of the J subbands uses a differential manner. ### Claim 9 (depends on 1) The method according to claim 1, wherein the method further comprises: sending, by the sending device, second control information indication signaling, wherein the second control information indication signaling is used to indicate at least one of a common rank indicator of the J subbands, the precoding matrix information of the J subbands, and common modulation and coding information of the J subbands. ### Claim 10 (depends on 1) The method according to claim 1, wherein the determining, by a sending device, rank indicators of J subbands corresponding to a to-be-transmitted channel comprises: determining, by the sending device based on channel quality measurement on a received reference signal, the rank indicators of the J subbands corresponding to the to-be-transmitted channel; or receiving the rank indicators reported by the receiving device that are of the J subbands corresponding to the to-be-transmitted channel. ### Claim 11 A sending device, comprising: a processor, configured to: determine rank indicators of J subbands corresponding to a to-be-transmitted channel, wherein at least one of the rank indicators of the J subbands is different than at least another of the rank indicators of the J subbands, and J is an integer greater than or equal to 2; determine, based on a rank indicator of each of the J subbands, a transmission block size and a quantity of transmission layers that corresponds to the subband, wherein the transmission block size is a transmission block size corresponding to the J subbands or a transmission block size corresponding to each of the J subbands; and map, based on the rank indicator of each of the J subbands, a transmission block corresponding to the subband to a transmission layer corresponding to the subband; and a transmitter, configured to map data carried on the transmission layer corresponding to the subband to a time-frequency resource for transmission. ### Claim 12 (depends on 11) The sending device according to claim 11, wherein the transmitter is further configured to: send first control information indication signaling, wherein the first control information indication signaling is used to indicate at least one of rank information, precoding matrix information, and modulation and coding information, the rank information comprises the rank indicator of each of the J subbands, the precoding matrix information comprises precoding matrix information of each of the J subbands, and the modulation and coding information comprises modulation and coding information of each of the J subbands. ### Claim 13 (depends on 11) The sending device according to claim 11, wherein the J subbands are M physical subbands corresponding to the to-be-transmitted channel, and J is equal to M; or the J subbands include at least one group of subbands having a same rank in the M physical subbands, the group of subbands having the same rank are at least two physical subbands whose rank indicators are the same in the M physical subbands, and J is less than M. ### Claim 14 (depends on 11) The sending device according to claim 11, wherein when the transmission block size is the transmission block size corresponding to each of the J subbands, the processor is configured to: use a rank indicator of an ith subband in the J subbands as a quantity of transmission layers that corresponds to the ith subband, wherein i is an integer greater than or equal to 1 and less than or equal to J; and determine, based on the rank indicator of the ith subband, a channel quality indicator CQI corresponding to the ith subband, and determine, based on the CQI corresponding to the ith subband, modulation and coding information corresponding to the ith subband; and determine, based on the quantity of transmission layers that corresponds to the ith subband, the modulation and coding information corresponding to the ith subband, and a quantity of scheduling resource blocks that corresponds to the ith subband, a transmission block size corresponding to the ith subband. ### Claim 15 (depends on 11) The sending device according to claim 11, wherein when the transmission block size is the transmission block size corresponding to the J subbands, the processor is configured to: use the rank indicator of the ith subband in the J subbands as the quantity of transmission layers that corresponds to the ith subband, wherein i is an integer greater than or equal to 1 and less than or equal to J; and determine, based on the transmission block size corresponding to each of the J subbands, the transmission block size corresponding to the J subbands. ### Claim 16 (depends on 11) The sending device according to claim 11, wherein the processor is configured to: map, based on the quantity of transmission layers that corresponds to the ith subband and a common quantity of code words of the J subbands, a code word corresponding to a transmission block corresponding to the ith subband to a transmission layer corresponding to the ith subband, wherein the common quantity of code words is the common quantity of code words of the J subbands; or map, based on the quantity of transmission layers that corresponds to the ith subband and a quantity of code words of the ith subband, a code word corresponding to a transmission block corresponding to the ith subband to a transmission layer corresponding to the ith subband, wherein quantities of code words of the J subbands are not totally the same. ### Claim 17 (depends on 11) The sending device according to claim 11, wherein the transmitter is configured to map, in an order of first frequency domain and then time domain, the data carried on the transmission layer corresponding to the subband. ### Claim 18 (depends on 12) The sending device according to claim 12, wherein the rank indicators of the J subbands in the first control information indication signaling use a differential manner; and/or the precoding matrix information of the J subbands uses a differential manner; and/or the modulation and coding information of the J subbands uses a differential manner. ### Claim 19 (depends on 11) The sending device according to claim 11, wherein the transmitter is further configured to send second control information indication signaling, wherein the second control information indication signaling is used to indicate at least one of a common rank indicator of the J subbands, the precoding matrix information of the J subbands, and common modulation and coding information of the J subbands. ### Claim 20 (depends on 11) The sending device according to claim 11, further comprising a receiver configured to receive a reference signal and to perform channel quality measurement on the to-be-transmitted channel based on the reference signal; and the processor is further configured to determine, based on a result of the channel quality measurement, the rank indicators of the J subbands corresponding to the to-be-transmitted channel; or the receiver is configured to receive the rank indicators reported by the receiving device that are of the J subbands corresponding to the to-be-transmitted channel.