Method of allocating frequency resources for a satellite telecommunication system
First Claim
1. A method of allocating frequency channels, from among a list of channels, to a plurality of terminals in a multi-beam satellite telecommunications system comprising a satellite and at least one feeder station, the satellite comprising at least one amplifier and at least one antenna, the method comprising the steps of:
- establishing a list of active terminals and, for each terminal,determining a first signal-to-noise ratio SNRn for the link between a feeder station and the terminal via the satellite, at least on the basis of an estimate of the attenuation undergone by the signal as a function of the signal propagation conditions,removing the terminal from the list of active terminals if the first signal-to-noise ratio is less than a predetermined threshold,computing the necessary radiofrequency power of the amplifier associated with the beam illuminating the terminal to obtain the said first signal-to-noise ratio,removing the terminal from the list of active terminals if the sum of the necessary radiofrequency powers of all the amplifiers of the satellite exceeds a maximum power capacity threshold; and
for each channel selected from the list of frequency channels;
i. computing a signal-to-interference ratio SIRc for the said terminal in the selected channel,ii. if the sum of the first signal-to-noise ratio SNRn and of the signal-to-interference ratio SIRc is less than the said predetermined threshold, allocating the selected channel to the said terminal,iii. otherwise, selecting another channel.
1 Assignment
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Accused Products
Abstract
A method is provided for dynamically allocating the radio resources of a satellite and a very high throughput satellite system configured to implement this method. The method of allocation is executed by a piece of ground equipment called a Radio Resource Manager. The method of allocation according to the invention, allocates dynamically in time frequency resources to each spot of the multibeam coverage in accord with the conditions of propagation of the radio signals (in particular the attenuations due to bad weather) prevailing in the spots, with the current and future spot data traffic profile, with the level of interference generated in the neighbouring beams. The method preferentially applies in respect of downgoing forward links, that is to say from the satellite to the user terminals.
4 Citations
12 Claims
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1. A method of allocating frequency channels, from among a list of channels, to a plurality of terminals in a multi-beam satellite telecommunications system comprising a satellite and at least one feeder station, the satellite comprising at least one amplifier and at least one antenna, the method comprising the steps of:
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establishing a list of active terminals and, for each terminal, determining a first signal-to-noise ratio SNRn for the link between a feeder station and the terminal via the satellite, at least on the basis of an estimate of the attenuation undergone by the signal as a function of the signal propagation conditions, removing the terminal from the list of active terminals if the first signal-to-noise ratio is less than a predetermined threshold, computing the necessary radiofrequency power of the amplifier associated with the beam illuminating the terminal to obtain the said first signal-to-noise ratio, removing the terminal from the list of active terminals if the sum of the necessary radiofrequency powers of all the amplifiers of the satellite exceeds a maximum power capacity threshold; and for each channel selected from the list of frequency channels; i. computing a signal-to-interference ratio SIRc for the said terminal in the selected channel, ii. if the sum of the first signal-to-noise ratio SNRn and of the signal-to-interference ratio SIRc is less than the said predetermined threshold, allocating the selected channel to the said terminal, iii. otherwise, selecting another channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A radio resources manager configured to execute a method of allocating frequency channels, from among a list of channels, to a plurality of terminals in a multi-beam satellite telecommunications system comprising a satellite and at least one feeder station, the satellite comprising at least one amplifier and at least one antenna, the method comprising the steps of:
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establishing a list of active terminals and, for each terminal, determining a first signal-to-noise ratio SNRn for the link between a feeder station and the terminal via the satellite, at least on the basis of an estimate of the attenuation undergone by the signal as a function of the signal propagation conditions, removing the terminal from the list of active terminals if the first signal-to-noise ratio is less than a predetermined threshold, computing the necessary radiofrequency power of the amplifier associated with the beam illuminating the terminal to obtain the said first signal-to-noise ratio, removing the terminal from the list of active terminals if the sum of the necessary radiofrequency powers of all the amplifiers of the satellite exceeds a maximum power capacity threshold; and for each channel selected from the list of frequency channels; i. computing a signal-to-interference ratio SIRc for the said terminal in the selected channel, ii. if the sum of the first signal-to-noise ratio SNRn and of the signal-to-interference ratio SIRc is less than the said predetermined threshold, allocating the selected channel to the said terminal, iii. otherwise, selecting another channel. - View Dependent Claims (12)
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Specification