# US 12,192,140 B2 · Efficient downlink control information transmission in mobile communication networks > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,192,140 B2 - Document ID: US12192140B2 - Status: Granted - Kind: B2 - Application number: 17/588,987 - Filed: 2022-01-31 - Published: 2022-05-19 - Granted: 2025-01-07 - Earliest claimed: 2019-07-31 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Yawei Yu; Chaojun Li - Web page: https://patentgrep.com/patent/US12192140B2 ## CPC - H04B 7/0452: Multi-user MIMO systems - H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals} - H04L 5/0023: {Time-frequency-space} - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract The present disclosure discloses example data transmission methods and apparatuses. One example method includes determining first downlink control information (DCI) by a network device. The first DCI is sent to n terminal devices by the network device, where the first DCI includes information for the n terminal devices to perform data transmission, and n is an integer greater than or equal to 2. ## Claims ### Claim 1 A data transmission method, comprising: determining, by a network device, first downlink control information; sending, by the network device, first information to n terminal devices, wherein the first information comprises a first correspondence table, the first correspondence table comprises a correspondence between at least one first sequence value, at least one second sequence value, and a DMRS antenna port, the at least one first sequence value comprises index values of demodulation reference signal (DMRS) antenna port combinations corresponding to the n terminal devices, and the at least one second sequence value comprises index values indicating pairing sequences of the n terminal devices; and sending, by the network device, the first downlink control information to the n terminal devices, wherein the first downlink control information indicates the n terminal devices to perform data transmission, and n is an integer greater than or equal to 2. ### Claim 2 (depends on 1) The method according to claim 1, wherein: the first downlink control information comprises demodulation reference signal (DMRS) antenna port indication information, and the DMRS antenna port indication information indicates a first sequence value corresponding to the n terminal devices. ### Claim 3 (depends on 1) The method according to claim 1, wherein the method further comprises: sending, by the network device, second information to the n terminal devices, wherein the second information comprises a value of n and a total quantity of layers of data on which the n terminal devices perform parallel transmission, the second information is used by the n terminal devices to determine the first correspondence table based on a predefined first relationship table set, and the predefined first relationship table set comprises at least one first correspondence table. ### Claim 4 (depends on 1) The method according to claim 1, wherein the method further comprises: sending, by the network device, first indication information to the n terminal devices, wherein the first indication information indicates a second sequence value corresponding to each of the n terminal devices. ### Claim 5 A data transmission method, comprising: receiving, by a terminal device, first downlink control information from a network device, wherein the first downlink control information indicates n terminal devices to perform data transmission, n is an integer greater than or equal to 2, and the terminal device is one of the n terminal devices; receiving, by the terminal device, first information from the network device, wherein the first information comprises a first correspondence table, and the first correspondence table comprises a correspondence between at least one first sequence value, at least one second sequence value, and a DMRS antenna port, the at least one first sequence value comprises index values of demodulation reference signal (DMRS) antenna port combinations corresponding to the n terminal devices, and the at least one second sequence value comprises index values indicating pairing sequences of the n terminal devices; and performing, by the terminal device, data transmission with the network device based on the first downlink control information. ### Claim 6 (depends on 5) The method according to claim 5, wherein: the first downlink control information comprises demodulation reference signal (DMRS) antenna port indication information, and the DMRS antenna port indication information indicates a first sequence value corresponding to the n terminal devices. ### Claim 7 (depends on 5) The method according to claim 5, wherein the method further comprises: receiving, by the terminal device, second information from the network device, wherein the second information comprises a value of n and a total quantity of layers of data on which the n terminal devices perform parallel transmission; and determining, by the terminal device, the first correspondence table in a predefined first relationship table set based on the second information. ### Claim 8 (depends on 5) The method according to claim 5, wherein the method further comprises: receiving, by the terminal device, first indication information from the network device, wherein the first indication information indicates a second sequence value corresponding to each of the n terminal devices; and determining, by the terminal device in the first correspondence table based on the first sequence value and the second sequence value, a DMRS antenna port corresponding to the terminal device. ### Claim 9 A data transmission apparatus, comprising: one or more processors; and a non-transitory computer readable memory, storing computer-executable instructions that, when executed by the one or more processors, cause the data transmission apparatus to perform operations comprising: determining first downlink control information; sending first information to n terminal devices, wherein the first information comprises a first correspondence table, the first correspondence table comprises a correspondence between at least one first sequence value, at least one second sequence value, and a DMRS antenna port, the at least one first sequence value comprises index values of demodulation reference signal (DMRS) antenna port combinations corresponding to the n terminal devices, and the at least one second sequence value comprises index values indicating pairing sequences corresponding to the n terminal devices; and sending the first downlink control information to the n terminal devices, wherein the first downlink control information indicates the n terminal devices to perform data transmission, and n is an integer greater than or equal to 2. ### Claim 10 (depends on 9) The apparatus according to claim 9, wherein: the first downlink control information comprises demodulation reference signal (DMRS) antenna port indication information, and the DMRS antenna port indication information indicates a first sequence value corresponding to the n terminal devices. ### Claim 11 (depends on 9) The apparatus according to claim 9, wherein the operations further comprise: sending second information to the n terminal devices, wherein the second information comprises a value of n and a total quantity of layers of data on which the n terminal devices perform parallel transmission, the second information is used by the n terminal devices to determine the first correspondence table based on a predefined first relationship table set, and the predefined first relationship table set comprises at least one first correspondence table. ### Claim 12 (depends on 9) The apparatus according to claim 9, wherein the operations further comprise: sending first indication information to the n terminal devices, wherein the first indication information indicates a second sequence value corresponding to each of the n terminal devices. ### Claim 13 A data transmission apparatus, comprising: one or more processors; and a non-transitory computer readable memory storing computer-executable instructions that, when executed by the one or more processors, cause the data transmission apparatus to perform operations comprising: receiving first downlink control information from a network device, wherein the first downlink control information comprises information for n terminal devices to perform data transmission, n is an integer greater than or equal to 2, and the data transmission apparatus is one of the n terminal devices; receiving first information from the network device, wherein the first information comprises a first correspondence table, and the first correspondence table comprises a correspondence between at least one first sequence value, at least one second sequence value, and a DMRS antenna port, the at least one first sequence value comprises index values of demodulation reference signal (DMRS) antenna port combinations corresponding to the n terminal devices, and the at least one second sequence value comprises index values indicating pairing sequences of the n terminal devices; and performing data transmission with the network device based on the first downlink control information. ### Claim 14 (depends on 13) The apparatus according to claim 13, wherein: the first downlink control information comprises demodulation reference signal (DMRS) antenna port indication information, and the DMRS antenna port indication information indicates a first sequence value corresponding to the n terminal devices. ### Claim 15 (depends on 13) The apparatus according to claim 13, wherein the operations further comprise: receiving second information from the network device, wherein the second information comprises a value of n and a total quantity of layers of data on which the n terminal devices perform parallel transmission; and determining the first correspondence table in a predefined first relationship table set based on the second information, wherein the predefined first relationship table set comprises at least one first correspondence table. ### Claim 16 (depends on 13) The apparatus according to claim 13, wherein the operations further comprise: receiving first indication information from the network device, wherein the first indication information indicates a second sequence value corresponding to each of the n terminal devices; and determining, in the first correspondence table based on the first sequence value and the second sequence value, a DMRS antenna port corresponding to the data transmission apparatus.