Method of power regulation in a satellite telecommunication network with at least two satellites in view
First Claim
1. Method of regulating the power of transmission between first and second stations in a satellite telecommunication network, a call signal being selectively transmitted from said first station to said second station either on different propagation paths via N respective satellites, in the form of N combined first signals received in the form of N combined second signals by said second station, together forming a global received signal, or via one of said N satellites on the corresponding propagation path, in the form of a first isolated signal received in the form of a second isolated signal by said second station, N being an integer greater than or equal to 2,said method comprising the following cyclic steps:
- regulation, for each of said N channels, of an isolated transmit power level command signal such that when it commands the power at which said first station transmits said first isolated signal in each of said channels the quality level of the corresponding isolated second signal received by said second station is equal to a reference quality level, and regulation, for all of said N channels, of N combined transmit power level command signals such that when they command the levels at which said first station respectively transmits said N combined first signals on said N channels the quality level of the global received signal formed from said N combined second signals is equal to said reference quality level, andwhere the isolated command signal having the minimal level is such that this minimal level is also less than a maximal tolerated isolated command level, selection of said minimal level isolated command signal to command the power with which said first station transmits said isolated first signal in said corresponding channel,otherwise, selection of said N combined command signals to command the power with which said first station transmits the respective combined first signals on said N channels.
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Abstract
The invention provides a method of regulating the power of transmission between first and second stations in a multiple satellite visibility satellite telecommunication network. The method comprises the following cyclic steps: regulation, for each of said N channels, of an isolated transmit power level command signal such that when it commands the power at which the first station transmits the first isolated signal in each channel the quality level of the corresponding isolated second signal received by the second station is equal to a reference quality level, and regulation, for all of the N channels, of N combined transmit power level command signals such that when they command the levels at which the first station respectively transmits the N first combined signals on the N channels the quality level of the global signal received formed from the N combined second signals is equal to the reference quality level. Depending on whether the isolated command signal having the minimal level is such that this minimal level is less than or greater than a maximal tolerated isolated command level, the minimal level isolated command signal is selected to command the power with which the first station transmits a call signal in the corresponding channel, or the N combined command signals are selected to command the power with which the first station transmits respective combined call signals on the N channels.
32 Citations
13 Claims
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1. Method of regulating the power of transmission between first and second stations in a satellite telecommunication network, a call signal being selectively transmitted from said first station to said second station either on different propagation paths via N respective satellites, in the form of N combined first signals received in the form of N combined second signals by said second station, together forming a global received signal, or via one of said N satellites on the corresponding propagation path, in the form of a first isolated signal received in the form of a second isolated signal by said second station, N being an integer greater than or equal to 2,
said method comprising the following cyclic steps: -
regulation, for each of said N channels, of an isolated transmit power level command signal such that when it commands the power at which said first station transmits said first isolated signal in each of said channels the quality level of the corresponding isolated second signal received by said second station is equal to a reference quality level, and regulation, for all of said N channels, of N combined transmit power level command signals such that when they command the levels at which said first station respectively transmits said N combined first signals on said N channels the quality level of the global received signal formed from said N combined second signals is equal to said reference quality level, and where the isolated command signal having the minimal level is such that this minimal level is also less than a maximal tolerated isolated command level, selection of said minimal level isolated command signal to command the power with which said first station transmits said isolated first signal in said corresponding channel, otherwise, selection of said N combined command signals to command the power with which said first station transmits the respective combined first signals on said N channels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. In a telecommunication network, a receiver station adapted to receive a signal transmitted by a transmitter station on N different propagation paths via N respective satellites, said signal being in the form of N combined first signals sent by said transmitter station to said N respective satellites, said signal being received by said receiver station in the form of N combined second signals from said N respective satellites, said first signals and said second signals together forming a global received signal, said receiver station comprising means for periodically measuring a quality level and a representative signal to noise ratio value in each of said N combined second signals, said receiver station including means for periodically measuring a global quality level and a global representative signal to noise ratio value in said global received signal.
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13. In a telecommunication network, a transmitter station adapted to set up a call to a receiver station on N different propagation paths via N respective satellites, said call defining N combined first signals sent by said transmitter station to said N respective satellites and defining N combined second signals from said N respective satellites to said receiver station, said transmitter station comprising:
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means for regulating, for each of said N propagation paths, an isolated transmit power level command signal such that, when the transmit power for said N combined first signals is commanded, a quality level of a corresponding one of said N combined second signals received by said receiver station is equal to a reference quality level, means for regulating, for said N propagation paths, N combined transmit power level command signals such that, when the transmit powers for said N combined first signals is commanded, the quality level of the global received signal is equal to said reference quality level, and means for selecting a minimal level isolated command signal such that, when said isolated transmit power level command signal having the minimal level is also less than a maximal tolerated isolated command level, said means for selecting selects said N combined command signals to command the powers at which said first station transmits said N combined first signals respectively on said N propagation paths.
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Specification