Link performance difference metrics and link adaptation for mesh satellite networks
First Claim
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1. A method for determining link performance metrics for terminals in a satellite communication network, the method comprising:
- identifying a first round trip link performance metric from a first terminal via a satellite back to the first terminal under clear sky conditions;
identifying a second round trip link performance metric from a reference terminal via the satellite back to the reference terminal under clear sky conditions;
identifying a first one-way link performance metric from the first terminal to the reference terminal via the satellite under clear sky conditions;
identifying a second one-way link performance metric from the reference terminal to the first terminal via the satellite under clear sky conditions;
identifying a third one-way link performance metric from the reference terminal to the first terminal via the satellite under dynamic conditions;
identifying a fourth one-way link performance metric from the first terminal to the reference terminal via the satellite under dynamic conditions;
identifying a fifth one-way link performance metric from a second terminal to the reference terminal via the satellite under clear sky conditions;
identifying a sixth one-way link performance metric from the reference terminal to the second terminal via the satellite under clear sky conditions;
identifying a seventh one-way link performance metric from the second terminal to the reference terminal via the satellite under dynamic conditions;
determining a first difference between a known link performance metric for the first terminal and a known link performance metric for the reference terminal;
determining a second difference between a known link performance metric for the second terminal and a known link performance metric for the reference terminal;
calculating at least one first terminal-to-satellite performance metric utilizing the plurality of identified round trip link performance metrics, the plurality of identified one-way link performance metrics, and the first difference;
calculating at least one second terminal-to-satellite performance metric utilizing the plurality of identified round trip link performance metrics, the plurality of identified one-way link performance metrics, and the second difference;
calculating a first dynamic link factor for the reference terminal based on the identified third one-way link performance metric and the link performance metrics identified under clear sky conditions;
calculating a second dynamic link factor for the first terminal based on the identified fourth one-way link performance metric and the link performance metrics identified under clear sky conditions;
calculating a third dynamic link factor for the second terminal based on the identified seventh one-way link performance metric and the link performance metrics identified under clear sky conditions; and
calculating a third round trip link performance metric between the first terminal and the second terminal utilizing the dynamic link factors.
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Abstract
Systems, devices, and methods are disclosed for determining link performance metrics for satellite communication terminals. Using link performance metrics and link performance difference metrics, signal modulation and coding may be decided. Link performance metrics may be determined for individual terminal uplinks and downlinks. Fixed and dynamic link adaptation mechanisms are also disclosed that utilize link performance metrics and link performance difference metrics determined under clear sky and dynamic conditions.
5 Citations
24 Claims
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1. A method for determining link performance metrics for terminals in a satellite communication network, the method comprising:
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identifying a first round trip link performance metric from a first terminal via a satellite back to the first terminal under clear sky conditions; identifying a second round trip link performance metric from a reference terminal via the satellite back to the reference terminal under clear sky conditions; identifying a first one-way link performance metric from the first terminal to the reference terminal via the satellite under clear sky conditions; identifying a second one-way link performance metric from the reference terminal to the first terminal via the satellite under clear sky conditions; identifying a third one-way link performance metric from the reference terminal to the first terminal via the satellite under dynamic conditions; identifying a fourth one-way link performance metric from the first terminal to the reference terminal via the satellite under dynamic conditions; identifying a fifth one-way link performance metric from a second terminal to the reference terminal via the satellite under clear sky conditions; identifying a sixth one-way link performance metric from the reference terminal to the second terminal via the satellite under clear sky conditions; identifying a seventh one-way link performance metric from the second terminal to the reference terminal via the satellite under dynamic conditions; determining a first difference between a known link performance metric for the first terminal and a known link performance metric for the reference terminal; determining a second difference between a known link performance metric for the second terminal and a known link performance metric for the reference terminal; calculating at least one first terminal-to-satellite performance metric utilizing the plurality of identified round trip link performance metrics, the plurality of identified one-way link performance metrics, and the first difference; calculating at least one second terminal-to-satellite performance metric utilizing the plurality of identified round trip link performance metrics, the plurality of identified one-way link performance metrics, and the second difference; calculating a first dynamic link factor for the reference terminal based on the identified third one-way link performance metric and the link performance metrics identified under clear sky conditions; calculating a second dynamic link factor for the first terminal based on the identified fourth one-way link performance metric and the link performance metrics identified under clear sky conditions; calculating a third dynamic link factor for the second terminal based on the identified seventh one-way link performance metric and the link performance metrics identified under clear sky conditions; and calculating a third round trip link performance metric between the first terminal and the second terminal utilizing the dynamic link factors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A satellite communication system configured to determine link performance metrics for terminals in a satellite communication system, the system comprising:
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a plurality of terminals; and a control center in communication with at least a subset of the terminals, wherein the control center is configured to; identify a first round trip link performance metric from a first terminal via a satellite back to the first terminal under clear sky conditions; identify a second round trip link performance metric from a reference terminal via the satellite back to the reference terminal under clear sky conditions; identify a first one-way link performance metric from the first terminal to the reference terminal via the satellite under clear sky conditions; identify a second one-way link performance metric from the reference terminal to the first terminal via the satellite under clear sky conditions; identify a third one-way link performance metric from the reference terminal to the first terminal via the satellite under dynamic conditions; identify a fourth one-way link performance metric from the first terminal to the reference terminal via the satellite under dynamic conditions; identify a fifth one-way link performance metric from a second terminal to the reference terminal via the satellite under clear sky conditions; identify a sixth one-way link performance metric from the reference terminal to the second terminal via the satellite under clear sky conditions; identify a seventh one-way link performance metric from the second terminal to the reference terminal via the satellite under dynamic conditions; determine a first difference between a known link performance metric for the first terminal and a known link performance metric for the reference terminal; determine a second difference between a known link performance metric for the second terminal and a known link performance metric for the reference terminal; calculate at least one first terminal-to-satellite performance metric utilizing the plurality of identified round trip link performance metrics, the plurality of identified one-way link performance metrics, and the first difference; calculate at least one second terminal-to-satellite performance metric utilizing the plurality of identified round trip link performance metrics, the plurality of identified one-way link performance metrics, and the second difference; calculate a first dynamic link factor for the reference terminal based on the identified third one-way link performance metric and the link performance metrics identified under clear sky conditions; calculate a second dynamic link factor for the first terminal based on the identified fourth one-way link performance metric and the link performance metrics identified under clear sky conditions; calculate a third dynamic link factor for the second terminal based on the identified seventh one-way link performance metric and the link performance metrics identified under clear sky conditions; and calculate a third round trip link performance metric between the first terminal and the second terminal utilizing the dynamic link factors. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A satellite communication device configured to determine link performance metrics for terminals in a satellite communication network, the device comprising:
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a receiver configured to receive link performance metrics for a plurality of terminals in the satellite communication network; a processor configured to; identify a first round trip link performance metric from a first terminal via a satellite back to the first terminal under clear sky conditions; identify a second round trip link performance metric from a reference terminal via the satellite back to the reference terminal under clear sky conditions; identify a first one-way link performance metric from the first terminal to the reference terminal via the satellite under clear sky conditions; identify a second one-way link performance metric from the reference terminal to the first terminal via the satellite under clear sky conditions; identify a third one-way link performance metric from the reference terminal to the first terminal via the satellite under dynamic conditions; identify a fourth one-way link performance metric from the first terminal to the reference terminal via the satellite under dynamic conditions; identify a fifth one-way link performance metric from a second terminal to the reference terminal via the satellite under clear sky conditions; identify a sixth one-way link performance metric from the reference terminal to the second terminal via the satellite under clear sky conditions; identify a seventh one-way link performance metric from the second terminal to the reference terminal via the satellite under dynamic conditions; determine a first difference between a known link performance metric for the first terminal and a known link performance metric for the reference terminal; determine a second difference between a known link performance metric for the second terminal and a known link performance metric for the reference terminal; calculate at least one first terminal-to-satellite performance metric utilizing the plurality of identified round trip link performance metrics, the plurality of identified one-way link performance metrics, and the first difference; calculate at least one second terminal-to-satellite performance metric utilizing the plurality of identified round trip link performance metrics, the plurality of identified one-way link performance metrics, and the second difference; calculate a first dynamic link factor for the reference terminal based on the identified third one-way link performance metric and the link performance metrics identified under clear sky conditions; calculate a second dynamic link factor for the first terminal based on the identified fourth one-way link performance metric and the link performance metrics identified under clear sky conditions; calculate a third dynamic link factor for the second terminal based on the identified seventh one-way link performance metric and the link performance metrics identified under clear sky conditions; and calculate a third round trip link performance metric between the first terminal and the second terminal utilizing the dynamic link factors; and a transmitter configured to transmit information regarding link performance metrics into the satellite communication network. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification