# US 12,119,972 B2 · Signal transmission method based on satellite communication and device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,119,972 B2 - Document ID: US12119972B2 - Status: Granted - Kind: B2 - Application number: 17/706,291 - Filed: 2022-03-28 - Published: 2022-07-07 - Granted: 2024-10-15 - Earliest claimed: 2019-09-29 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Jianwei Zhou; Chenlei Xu; Hejia Luo; Jun Wang - Web page: https://patentgrep.com/patent/US12119972B2 ## CPC - H04L 27/26025: {Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking (allocating sub-channels of the transmission path H04L5/003)} - H04B 7/1851: {Systems using a satellite or space-based relay (H04B7/18508, H04B7/18521 take precedence; providing specific services H04B7/18523 - H04B7/18576)} - H04B 7/18519: {Operations control, administration or maintenance} - H04L 27/2602: {Signal structure} - H04L 27/2607: {Cyclic extensions} - H04L 27/2646: {using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length} - H04L 27/2666: {Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length} - H04L 27/2695: {with channel estimation, e.g. determination of delay spread, derivative or peak tracking (channel estimation H04L25/0202)} - H04W 16/28: using beam steering - H04L 27/2663: {Coarse synchronisation, e.g. by correlation} - H04W 84/06: Airborne or Satellite Networks (space-based or airborne stations H04B7/185) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Example signal transmission methods based on satellite communication and apparatus are described. One example method includes: obtaining, by a communication device, carrier attribute information corresponding to a target carrier used to transmit an orthogonal frequency division multiplexing (OFDM) symbol. The carrier attribute information of the target carrier includes subcarrier spacing. The communications device determines a cyclic prefix (CP) length of the OFDM symbol based on the carrier attribute information of the target carrier and a preset correspondence between carrier attribute information and the OFDM symbol. The CP is used to carry first data. The first data is data in the OFDM symbol. ## Claims ### Claim 1 A signal transmission method based on satellite communication, comprising: obtaining, by a communications device, carrier attribute information corresponding to a target carrier used to transmit an orthogonal frequency division multiplexing (OFDM) symbol, wherein the carrier attribute information of the target carrier comprises subcarrier spacing; determining, by the communications device, a cyclic prefix (CP) length of the OFDM symbol based on the carrier attribute information corresponding to the target carrier and a preset correspondence between the carrier attribute information and the OFDM symbol, wherein a CP is used to carry first data, and the first data is data in the OFDM symbol; and determining, by the communications device, a cyclic suffix (CS) length of the OFDM symbol based on the carrier attribute information corresponding to the target carrier and a preset correspondence between the carrier attribute information and the CS length, wherein the CS length is at least one of a part of the CP length or a length of a part of the data in the OFDM symbol. ### Claim 2 (depends on 1) The method according to claim 1, wherein the carrier attribute information further comprises one or more of a beam identifier and a beam elevation angle of a beam in which the target carrier is located. ### Claim 3 (depends on 2) The method according to claim 2, wherein the preset correspondence between the carrier attribute information and the OFDM symbol comprises a correspondence between subcarrier spacing and the CP length. ### Claim 4 (depends on 2) The method according to claim 2, wherein the preset correspondence between the carrier attribute information and the OFDM symbol further comprises: a correspondence between subcarrier spacing and each of a CP length and a CS length; or a correspondence between each of subcarrier spacing and a beam identifier, and each of a CP length and a CS length; or a correspondence between each of subcarrier spacing and a beam elevation angle, and each of a CP length and a CS length; or a correspondence between each of subcarrier spacing, a beam identifier, and a beam elevation angle, and each of a CP length and a CS length. ### Claim 5 (depends on 1) The method according to claim 1, wherein the CP is further used to carry second data, and the second data is data different from the OFDM symbol. ### Claim 6 A communications device, comprising: at least one processor; and one or more memories coupled to the at least one processor and storing program instructions for execution by the at least one processor to: obtain carrier attribute information corresponding to a target carrier used to transmit an orthogonal frequency division multiplexing (OFDM) symbol, wherein the carrier attribute information of the target carrier comprises subcarrier spacing; determine a cyclic prefix (CP) length of the OFDM symbol based on the carrier attribute information corresponding to the target carrier and a preset correspondence between the carrier attribute information and the OFDM symbol, wherein a CP is used to carry first data, and the first data is data in the OFDM symbol; and determine a cyclic suffix (CS) length of the OFDM symbol based on the carrier attribute information corresponding to the target carrier and a preset correspondence between the carrier attribute information and a CS length, wherein the CS length is at least one of a part of the CP length or a length of a part of the data in the OFDM symbol. ### Claim 7 (depends on 6) The communications device according to claim 6, wherein the carrier attribute information further comprises one or more of a beam identifier and a beam elevation angle of a beam in which the target carrier is located. ### Claim 8 (depends on 7) The communications device according to claim 7, wherein the preset correspondence between the carrier attribute information and the OFDM symbol comprises a correspondence between subcarrier spacing and the CP length. ### Claim 9 (depends on 7) The communications device according to claim 7, wherein the preset correspondence between the carrier attribute information and the OFDM symbol further comprises: a correspondence between subcarrier spacing and each of a CP length and a CS length; or a correspondence between each of subcarrier spacing and a beam identifier, and each of a CP length and a CS length; or a correspondence between each of subcarrier spacing and a beam elevation angle, and each of a CP length and a CS length; or a correspondence between each of subcarrier spacing, a beam identifier, and a beam elevation angle, and each of a CP length and a CS length. ### Claim 10 (depends on 6) The communications device according to claim 6, wherein the CP is further used to carry second data, and the second data is data different from the OFDM symbol. ### Claim 11 A non-transitory computer readable storage medium, wherein the non-transitory computer readable storage medium stores program instructions for execution by at least one processor to: obtain carrier attribute information corresponding to a target carrier used to transmit an orthogonal frequency division multiplexing (OFDM) symbol, wherein the carrier attribute information of the target carrier comprises subcarrier spacing; determine a cyclic prefix (CP) length of the OFDM symbol based on the carrier attribute information corresponding to the target carrier and a preset correspondence between the carrier attribute information and the OFDM symbol, wherein a CP is used to carry first data, and the first data is data in the OFDM symbol; and determine a cyclic suffix (CS) length of the OFDM symbol based on the carrier attribute information corresponding to the target carrier and a preset correspondence between the carrier attribute information and a CS length, wherein the CS length is at least one of a part of the CP length or a length of a part of the data in the OFDM symbol. ### Claim 12 (depends on 11) The non-transitory computer readable storage medium according to claim 11, wherein the carrier attribute information further comprises one or more of a beam identifier and a beam elevation angle of a beam in which the target carrier is located. ### Claim 13 (depends on 12) The non-transitory computer readable storage medium according to claim 12, wherein the preset correspondence between the carrier attribute information and the OFDM symbol comprises a correspondence between subcarrier spacing and the CP length. ### Claim 14 (depends on 12) The non-transitory computer readable storage medium according to claim 12, wherein the preset correspondence between the carrier attribute information and the OFDM symbol further comprises: a correspondence between subcarrier spacing and each of a CP length and a CS length; or a correspondence between each of subcarrier spacing and a beam identifier, and each of a CP length and a CS length; or a correspondence between each of subcarrier spacing and a beam elevation angle, and each of a CP length and a CS length; or a correspondence between each of subcarrier spacing, a beam identifier, and a beam elevation angle, and each of a CP length and a CS length. ### Claim 15 (depends on 11) The non-transitory computer readable storage medium according to claim 11, wherein the CP is further used to carry second data, and the second data is data different from the OFDM symbol.