# US 2021/0242930 A1 · Communication method and system that uses low latency/low data bandwidth and high latency/high data bandwidth pathways > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0242930 A1 - Document ID: US20210242930A1 - Status: Published application - Kind: A1 - Application number: 16/948,298 - Filed: 2020-09-11 - Published: 2021-08-05 - Earliest claimed: 2014-12-11 - Assignees: Skywave Networks LLC - Applicants: Skywave Networks LLC - Inventors: Kevin J. Babich - Web page: https://patentgrep.com/patent/US20210242930A1 ## CPC - H04B 7/145: Passive relay systems - H04B 7/18504: {Aircraft used as relay or high altitude atmospheric platform} - H04B 7/22: Scatter propagation systems {, e.g. ionospheric, tropospheric or meteor scatter} - H04B 10/25: Arrangements specific to fibre transmission - H04W 28/20: Negotiating bandwidth - 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 A communication system uses multiple communications links, preferably links that use different communications media. The multiple communications links may include a high latency/high bandwidth link using a fiber-optic cable configured to carry large volumes of data but having a high latency. The communications links may also include a low latency/low bandwidth link implemented using skywave propagation of radio waves and configured to carry smaller volumes of data with a lower latency across a substantial portion of the earth's surface. The two communications links may be used together to coordinate various activities such as the buying and selling of financial instruments. ## Claims ### Claim 1 A method, comprising: transmitting command data from a transmission station via a first communication link, wherein the command data defines one or more commands; transmitting triggering data from the transmission station via a second communication link, wherein the triggering data includes an identifier identifying at least one of the one or more commands; and wherein the second communication link transmits the triggering data using electromagnetic waves transmitted via skywave propagation. ### Claim 2 (depends on 1) The method of claim 1, wherein: the first communication link has greater latency than the second communication link; and the first communication link has larger bandwidth than the second communication link. ### Claim 3 (depends on 1) The method of claim 1, wherein the first and second communication links transmit the triggering data using electromagnetic waves transmitted via skywave propagation. ### Claim 4 (depends on 1) The method of claim 1, further comprising: determining a maximum usable frequency for skywave propagation over the second communication link; transmitting the triggering data over the second communication link at a frequency that is less than or equal to the maximum usable frequency. ### Claim 5 (depends on 1) The method of claim 1, further comprising: determining a minimum usable frequency for skywave propagation over the second communication link; transmitting the triggering data over the second communication link at a frequency that is greater than or equal to the minimum usable frequency. ### Claim 6 (depends on 1) The method of claim 1, wherein said transmitting the triggering data includes transmitting the electromagnetic waves below the critical angle. ### Claim 7 (depends on 1) The method of claim 1, further comprising: receiving the command data at a receiving station remote from the transmission station; and receiving the triggering data at the receiving station. ### Claim 8 (depends on 7) The method of claim 7, further comprising: transmitting the command data on both the first communication link and the second communication link. ### Claim 9 (depends on 8) The method of claim 8, wherein said receiving the command data includes receiving the command data via the first communication link before receiving the command data via the second communication link. ### Claim 10 (depends on 8) The method of claim 8, wherein said receiving the command data includes receiving the command data via the second communication link before receiving the command data via the first communication link. ### Claim 11 (depends on 7) The method of claim 7, further comprising: transmitting the triggering data on both the first communication link and the second communication link. ### Claim 12 (depends on 11) The method of claim 11, wherein said receiving the triggering data includes receiving the triggering data via the first communication link before receiving the triggering data via the second communication link. ### Claim 13 (depends on 11) The method of claim 11, wherein said receiving the triggering data includes receiving the triggering data via the second communication link before receiving the triggering data via the first communication link. ### Claim 14 (depends on 7) The method of claim 7, further comprising: executing at least one of the one or more commands identified in the triggering data in response to said receiving the triggering data, the at least one command executed using a processor at the receiving station. ### Claim 15 (depends on 14) The method of claim 14, wherein said executing occurs on or after both the command data and triggering data is fully received at the receiving station. ### Claim 16 A method, comprising: receiving command data at a receiving station via a first communication link, wherein the command data defines one or more commands; receiving triggering data at a receiving station via a second communication link, wherein the triggering data includes an identifier identifying at least one of the one or more commands; wherein the triggering data passes over the second communication link to the receiving station using electromagnetic waves received via skywave propagation; and wherein the command data passes over the first communication link to the receiving station without using skywave propagation. ### Claim 17 (depends on 16) The method of claim 16, wherein the first communication link has larger data bandwidth than the second communication link. ### Claim 18 (depends on 16) The method of claim 16, further comprising: executing at least one of the one or more commands identified in the triggering data in response to said receiving the triggering data, the at least one command executed using a processor at the receiving station. ### Claim 19 (depends on 16) The method of claim 16, wherein the command data is defined by a collection of data with a first size, and the triggering data is defined by a collection of data with a second size, and the first size is greater than or equal to the second size. ### Claim 20 (depends on 16) The method of claim 16, wherein the one or more commands include instructions to buy and/or sell one or more financial instruments. ### Claim 21 (depends on 16) The method of claim 16, wherein the first communication link includes an optical fiber. ### Claim 22 (depends on 16) The method of claim 16, further comprising: retransmitting the electromagnetic waves via one or more repeaters. ### Claim 23 (depends on 16) The method of claim 16, wherein the second communication link transmits the triggering data using multiple frequencies. ### Claim 24 (depends on 16) The method of claim 16, wherein the skywave propagation includes refracting the electromagnetic waves from the ionosphere. ### Claim 25 (depends on 16) The method of claim 16, wherein there is at least one skip zone between the transmitting and receiving stations. ### Claim 26 (depends on 16) The method of claim 16, wherein the distance between the transmitting and receiving stations is greater than the radio horizon.