• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to the field of satellite communication systems and relates to a method for managing the communication resources allocated by a central control device to the various communication terminal devices within a global satellite communication system. In particular, the invention relates to the management of communication resources by monitoring the equivalent isotropically radiated power transmitted by a terminal of the satellite communication system.
    公开号:FR3014270A1
    申请号:FR1302784
    申请日:2013-11-29
    公开日:2015-06-05
    发明作者:Marc Touret；Bertrand Prillard；Yves Guillerme；Eric Privat
    申请人:Thales SA；
    IPC主号:
    专利说明:

    [0001] Satellite communication device, satellite communication system comprising such a device and method for managing allocated resources within such a system.
    [0002] The present invention relates to the field of satellite communication systems and more specifically to a method of managing communication resources allocated by a central control equipment to the various communication terminals within a global satellite communication system. The term "communication resources" refers here in particular to the bandwidth and the transmitted power, the present invention more specifically aimed at optimizing power. In particular, the invention relates to the management of communication resources by monitoring the equivalent isotropically radiated power transmitted by a terminal of the satellite communication system. In the field of satellite communications, international technical standards, such as the standards defined by the International Telecommunication Union, define recommendations in various subfields such as efficient spectrum management or the propagation of electromagnetic waves. In particular, these standards recommend that certain constraints be observed regarding the equivalent isotropically radiated power density of terrestrial communications stations transmitting within a satellite communications network. These constraints are defined by a threshold of maximum power to be respected by the transmitting terrestrial stations to limit the interference generated on the satellites adjacent to the satellite targeted by the station. The equivalent isotropically radiated power of a terrestrial station can be calculated from the link budget. In other words, it is possible to calculate the minimum power a station must transmit to respect a given transmission rate and a target signal-to-noise ratio. This calculation takes into account the parameters of the waveform of the transmitted signal, the characteristics of the stations of the network as well as those of the satellite.
    [0003] This calculation can be performed by a resource control equipment for controlling, via a servo loop, the transmission power of a signal by a terrestrial station. If the calculated power is greater than the recommended limit, the resource control will decrease the requested rate to the station for its power to decrease. To perform a precise calculation of the equivalent isotropic radiated power, it is necessary to accurately model the various uncertainties of the transmission chain, which requires an important work of calibration of equipment. In addition, in the case of mobile earth stations, especially airborne stations, the large temperature variations increase the uncertainties on the various gains of the chain of transmission. These uncertainties result in a limitation of the maximum bit rate allocated to a station due to the imprecision of the link budget calculations. In other words, the calculated power setpoint having a deviation from the power actually emitted, the resources can not be optimally allocated to best approach the maximum power limits allowed. In other words, when several earth stations dynamically share the same satellite communication resources, the resource control equipment shares the frequency band between these stations but also the transmission power. The power sharing is all the more optimal that the emitted equivalent isotropically radiated power is accurate with respect to the power setpoint 30 given by the resource control equipment. Otherwise, system resources are not used to their full potential. The present invention therefore aims to overcome the problem of calculation uncertainty of the equivalent isotropically radiated power which makes the allocation of communication resources to the different users of a satellite communication system non-optimal. The equivalent isotropically radiated power is most often based on a precise frequency and temperature calibration of the equipment of the transmission chain of a transmitting terrestrial station, this solution being constraining because it depends on the components used which can be renewed, making the The present invention makes it possible to respond to the aforementioned problem and to solve the limitations of the known solutions by an accurate and continuous estimation of the difference between the power setpoint calculated by the resource control equipment and the radiated isotropic power. equivalent effectively The invention thus relates to a satellite communication device comprising an antenna for communicating with a satellite, said device comprising: a measurement module configured to perform a plurality of measurements of the radiated isotropic power; equivalent of the antenna, - a receiving module adapted to receive, periodically, an equivalent isotropic radiated power setpoint to be applied to the signal transmitted by said antenna, said setpoint being calculated by a control equipment to respect a target link budget on the satellite link between said communication device and another device of the same network, a calculation module configured to calculate an average, over a first time interval, of said plurality of power measurements, to calculate an average, on a second time interval substantially identical to said first time interval, said c received power lines, o calculating the difference between the average of the power setpoints and the average of the power measurements, - a transmission module adapted to transmit said deviation to said control equipment, via said satellite. The device according to the invention comprises, according to a particular aspect of the invention, a high-power amplifier in which said measurement module is implemented, the power being measured at the output of said high-power amplifier and being corrected for the gain of the antenna. . The device according to the invention comprises, according to a particular aspect of the invention, an RF chain connected at the input to the output of the high power amplifier 20 and at the output to the antenna, the power measured at the output of said high power amplifier being further corrected for the gain of the RF chain. According to another particular aspect of the device according to the invention, the power measured at the output of the high power amplifier is a peak power and this power is corrected for the peak factor of the modulation of the transmitted signal. According to another particular aspect of the device according to the invention, the measured power is corrected by a measurement bias depending on the power difference between a modulated carrier and an unmodulated carrier.
    [0004] According to another particular aspect of the device according to the invention, said averages are sliding averages over a chosen time horizon. The subject of the invention is also a satellite communication system comprising at least one satellite communication device according to the invention and equipment for controlling the resources allocated within said system, said control equipment comprising: a calculation module adapted to calculate an equivalent isotropic radiated power setpoint as a function of a target link budget to be reached on the satellite link between a first communication device and a second communication device, - a transmission module of this power setpoint to said first device, - a module for receiving a difference between said power setpoint and the equivalent isotropically radiated power emitted by said first device, said deviation being transmitted by said first device, - a resource management module configured to allocate more or less communication resources to said first device or to others system devices according to said deviation. According to a particular aspect of the system according to the invention, said resource management module is configured to update the maximum permissible equivalent isotropic radiated power by adding said received power difference.
    [0005] According to a particular aspect of the system according to the invention, said resource management module is configured to take the following resource allocation decisions: - If the power setpoint transmitted to said first device is strictly less than the maximum equivalent isotropically radiated power permissible, allocate available resources to said first device or other devices in the system, - If the power setpoint transmitted to said first device is strictly greater than the maximum permissible equivalent isotropically radiated power, reduce the resources allocated to said first device.
    [0006] According to a particular aspect of the system according to the invention, said control equipment comprises a servo-control loop of the power of said first device configured to adjust the power setpoint transmitted to said first device according to the resources allocated to said first device and a signal-to-noise ratio target measured on the link between said first device and said second device. According to a particular aspect of the system according to the invention, the allocated communication resources are resources in flow or in spectral efficiency. The subject of the invention is also a method of controlling allocated resources within a satellite communication system comprising at least one satellite communication device and resource control equipment within said system, said method comprising the steps following: - Periodically calculate an equivalent isotropic radiated power setpoint as a function of a target link budget to be reached on the satellite link between a first communication device and a second communication device, - Perform a plurality of isotropic power measurements radiated equivalent of the antenna of said first device, - calculating an average, over a first time interval, of said plurality of power measurements, - calculating an average, over a second time interval substantially identical to said first time interval, of said power instructions , - Calculate the difference between the average con Signs of power and average power measurements, - Allocate more or less communication resources to said first device or other system devices according to said deviation. The method according to the invention may also comprise a step 5 of updating the maximum permissible equivalent isotropic radiated power by adding said power difference. The method according to the invention may also include the following resource allocation decision step: If the power setpoint transmitted to said first device is strictly less than the maximum equivalent isotropically radiated power, allocate the available resources to said first device. device or other system devices, - If the power setpoint transmitted to said first device is strictly greater than the maximum permissible equivalent isotropic radiated power, reduce the resources allocated to said first device. Other features and advantages of the present invention will appear better on reading the description which follows in relation to the appended drawings which represent: FIG. 1, a diagram of a satellite communications system according to the prior art, FIG. 2 is a diagram of a satellite communications system according to the invention; FIG. 3 is a flowchart detailing the stages of implementation of the method, according to the invention, of management of allocated resources within a satellite communications system. FIG. 1 illustrates, in a diagram, a satellite communications system SAT comprising at least one terrestrial station ST1, which can be embedded in a vehicle, in particular an aircraft, and a central control equipment EC responsible for managing the resources of the satellite. global system communication for all stations seeking to communicate via the SAT satellite. By way of illustration, two terrestrial stations ST1, ST2 are shown in FIG. 1, it being understood that in a real application case, the satellite communication system may be composed of a large number of stations. In particular, the EC control equipment is responsible for controlling the power of the signal transmitted by the ST1, ST2 stations of the network so as to respect the prescribed equivalent isotropically radiated power limits so as not to create interference for neighboring satellites. SAT, but also in order to optimally manage the resources allocated to the different stations of the network to communicate.
    [0007] For this purpose, the control equipment EC comprises a module for calculating a power setpoint transmitted for each station ST1, ST2. The power setpoint is calculated from the desired link budget on the communication link LD between the station ST1 and another station ST2 of the network. The link budget depends in particular on the desired bit rate for the LD link and the target signal-to-noise ratio. The power setpoint is then transmitted to the station ST1 via a dedicated return channel LR between the control equipment EC and the station ST1. For this purpose, the control equipment EC and the terrestrial station ST comprise means MD1, MD2 transmitting / receiving the signal transmitted on the satellite link.
    [0008] To ensure a target signal-to-noise ratio, the EC control equipment can set up a control loop for the power of the earth station by measuring the signal-to-noise ratio on the direct link LD and incrementing or decrementing the setpoint. periodically to converge to a steady state. For this, the power setpoint is updated regularly, for example at the rate of a frame of the waveform of the transmitted signal, and retransmitted periodically to the ground station ST1. The terrestrial station ST1 comprises at least means MD1 for transmitting and receiving a signal in a satellite waveform, also called modem, a high-power amplifier AHP and a satellite antenna A1. The station ST1 may comprise other equipment necessary for the implementation of a satellite communication, these additional equipment not being shown in FIG. 1. On receipt of the power setpoint, the station ST1 adjusts the power of MD1 modem output equal to the input power of the high power amplifier AHP. The input power of the amplifier is determined by taking into account the gain of the amplifier AHP, the gain of the antenna and possibly the gain of other elements located between the amplifier and the antenna such as an amplifier. RF channel. As discussed in the preamble, these calculations lead to inaccuracy due in particular to the variability of the gain of the amplifier as a function of temperature. The power actually emitted by the antenna A1 therefore has a greater or lesser difference with the power setpoint imposed by the EC control equipment.
    [0009] FIG. 2 schematizes a satellite communications system adapted according to the invention to solve the disadvantages of the system described in FIG. 1. The terrestrial station ST1 comprises, in addition to the elements already described in FIG. 1, a measurement module MP of the equivalent isotropically radiated power, or EIRP, of the signal emitted by the antenna A1. Advantageously, this module can be co-located with the high power amplifier AHP so as to measure the power of the signal at the output of the amplifier. In this case, the gain of the antenna A1 must be added to obtain a measurement of the power of the signal transmitted by the antenna A1. Other equipment can be inserted between the amplifier AHP and the antenna A1, for example an RF radio frequency chain comprising other amplifiers and / or various filters. In this case, the gain of the RF chain must also be added to the output power measurement of the amplifier AHP to obtain a measurement of the EIRP emitted at the output of the antenna A1.
    [0010] The measuring module MP performs a power measurement periodically with a predefined period. If the measurement represents a peak power of the signal then it must be corrected for the peak factor of the modulation used. For example, if the signal is modulated using Tr / 4-QPSK modulation, a correction of 3.5dB must be made to the measurement. In addition, in all cases, the measurement must also be corrected for bias related to the difference in power measurement between an unmodulated carrier and a modulated carrier. The terrestrial station ST1, according to the invention, also comprises a calculation module MC, advantageously co-located with the modem MD1, but which can also be implemented in the form of an interface module between the modem MD and the module MP measurement. It can also be integrated with equipment located between the modem MD1 and the amplifier AHP 20 such as for example a control unit pointing the antenna Al. The calculation module MC periodically receives, via the modem MD1, the power setpoint transmitted by the EC control equipment via the return link LR. The frequency of sending this set point is, for example, synchronous with the frame rate of the waveform used to shape the signal. According to a particular variant of the invention, the modem MD1 triggers a power measurement request to the measurement module MP before the end of a frame, taking into account the transmission delay between the two entities. The calculation module MC periodically determines a first average of the powers measured by the measurement module MP over a given time horizon and a second average of the power instructions received over the same time horizon. The chosen time horizon can be taken as equal to a given number of frames. Advantageously, aberrant power measurements, in particular measurements corresponding to poor antenna pointing, may be eliminated from the averaging calculation. Calculated averages can be slippery averages. An advantage to using a sliding average is that the calculation module MC can be configured to directly integrate a number of measurements of predetermined power corresponding to the chosen time horizon and to integrate the power instructions in the same way. Whenever a new measurement is available, it is transmitted by the measurement module MP to the calculation module MC which updates its sliding average by removing from this average the oldest measurement and adding the new value. . Thus, the use of a sliding average makes it possible to simplify the complexity of implementing the invention. The calculation module MC ultimately determines the difference between the average of the power setpoints and the average of the measured powers and communicates this difference to the modem MD1 which transmits this information to the control equipment EC via an LS signaling link. The EC control equipment, on receiving the difference information between the power setpoint and the power of the antenna actually measured, modifies its policy of managing the resources allocated to the network 25 via a module GRES management system. In particular, the GRES management module updates the maximum permissible equivalent isotropic radiated power by adding to it the power difference transmitted by the terrestrial station ST. Thus, the uncertainty between the power setpoint and the power of the signal actually emitted by the antenna A1 is transferred to the threshold value of the permissible power to limit the level of interference.
    [0011] Two scenarios can then arise. If the difference between the power setpoint and the measured power is negative, it means that the power of the signal actually transmitted is greater than the setpoint allocated by the EC control equipment. In this case, there is a risk that the signal power level exceeds the permissible level and the EC control equipment must then lower the power setpoint for the ST station by decreasing, for example, the required bit rate for the link. satellite associated with this station. If, on the other hand, the difference between the power setpoint and the measured power is positive, it means that the power of the signal actually transmitted is less than the setpoint allocated by the EC control equipment. In this case, the resources of the system are not exploited to the maximum. The GRES resource management module can be configured to reallocate available resources to the ST station, for example, by assigning a higher rate to it or allocate those resources to other stations in the network. The allocated resources can also be expressed in terms of spectral efficiency instead of throughput. The spectral efficiency depends in particular on the type of modulation and on the type and efficiency of correction code chosen. The calculation module MC that comprises the ground station ST1 can be realized in software and / or hardware form. Advantageously, this calculation module can be implemented in software form at the MAC medium access layer of the modem MD1. The measurement module MP that comprises the ground station ST1 can also be realized in software and / or hardware form. Advantageously, this measurement module can be integrated with the high power amplifier AHP.
    [0012] The various modules implemented by the invention may in particular consist of a processor and a memory. The processor may be a generic processor, a specific processor, an application-specific integrated circuit (also known as the ASIC for "Application-Specific Integrated Circuit") or a network of programmable gates in situ (also known as the English name of FPGA for "Field-Programmable Gate Array"). FIG. 3 summarizes, on a flowchart, the main steps of implementing the resource control method according to the invention. In a first step 301, the control equipment EC periodically calculates an equivalent isotropic radiated power setpoint as a function of a target link budget to be reached on the satellite link LD between the terrestrial station ST1 and another station ST2 of the network. This power setpoint is sent to the ground station ST1 via a return satellite link LR. In a second step 302, the terrestrial station ST1 performs a plurality of measurements of the equivalent isotropically radiated power by the antenna A1. In a third step 303, the averages over a first time interval of the measured powers are calculated. In a fourth step 304, the average of the power instructions is calculated over the same time interval. In a fifth step 305, the difference between the average of the power setpoints and the average of the power measurements is calculated and this difference is transmitted to the EC control equipment. In a final step 306, the EC control equipment decides to allocate more or less communication resources to the terrestrial station ST or to other stations of the system according to said deviation.
    [0013] The averaging steps 303,304 and the power offset calculation step 305 are performed periodically to be able to provide this information regularly to the control equipment.
    [0014] The invention has the following advantages in particular. It makes it possible to circumvent the need to carry out an accurate calibration of the equipment of the terrestrial station, which proves difficult for mobile stations and in particular for the calibration of the active components of the RF chain like the high power amplifier AHP. In addition, the proposed solution remains operational even when a component of the chain is modified. The invention makes it possible to optimize the satellite resources in terms of the power effectively radiated by the stations and indirectly the bit rate allocated to communicate. In addition, it allows a better respect of the maximum permissible radiated power constraints as fixed by the standards in force. The invention also allows an optimization of the sharing of resources on all the stations of the communication network.
    权利要求:
    Claims (14)
    [0001]
    REVENDICATIONS1. A satellite communication device (ST1) comprising an antenna (A1) for communicating with a satellite (SAT), said device (ST1) being characterized in that it comprises - a measurement module (MP) configured to perform a plurality of measurements of the equivalent isotropic radiated power of the antenna (A1), - a reception module (MD1) adapted to receive, periodically, an equivalent isotropic radiated power setpoint to be applied to the signal emitted by said antenna (A1), said setpoint being calculated by a control equipment (EC) to comply with a target link budget on the satellite link between said communication device (ST1) and another device (ST2) of the same network, - a calculation module (MC) configured to calculating an average, over a first time interval, of said plurality of power measurements; calculating an average over a second time interval substantially identical to said first interval; time, of said received power orders, o calculate the difference between the average of the power setpoints and the average of the power measurements, - a transmission module (MD1) adapted to transmit said deviation to said control equipment, via said satellite .
    [0002]
    The satellite communication device (ST1) according to claim 1 comprising a high power amplifier (AHP) in which said measurement module (MP) is implemented, the power being measured as a result of said high power amplifier (AHP) and being corrected from the antenna gain (A1).
    [0003]
    3. Satellite communication device (ST1) according to claim 2 comprising an RF chain input connected to the output of the high power amplifier (AHP) and output to the antenna (A1), the measured power output of said high power amplifier (AHP) being further corrected for the gain of the RF chain.
    [0004]
    4. Satellite communication device (ST1) according to one of the preceding claims wherein the power measured at the output of the high power amplifier (AHP) is a peak power and this power is corrected for the peak factor of the signal modulation. issued.
    [0005]
    5. Satellite communication device (ST1) according to one of the preceding claims wherein the measured power is corrected for a measurement bias dependent on the power difference between a modulated carrier and a unmodulated carrier.
    [0006]
    6. Satellite communication device (ST1) according to one of the preceding claims wherein said averages are sliding averages over a chosen time horizon.
    [0007]
    7. A satellite communication system comprising at least one satellite communication device (ST1) according to one of the preceding claims and a control equipment (EC) of the resources allocated within said system, said control equipment (EC) comprising : A calculation module (MCONS) adapted to calculate an equivalent isotropic radiated power setpoint as a function of a target link budget to be reached on the satellite link between a first communication device (ST1) and a second communication device ( ST2), - a transmission module (MD2) of this power setpoint to said first device (ST1), - a receiving module (MD2) a difference between said power setpoint and the equivalent isotropically radiated power emitted by said first device (ST1), said deviation being transmitted by said first device (ST1), - a resource management module (GRES) configured to allocate more or fewer resources communication with said first device (ST1) or other devices (ST2) of the system according to said deviation.
    [0008]
    The satellite communication system of claim 7 wherein said resource management module (GRES) is configured to update the maximum allowable equivalent isotropic radiated power by adding said received power spread.
    [0009]
    9. Satellite communication system according to claim 8 wherein said resource management module (GRES) is configured to make the following resource allocation decisions: - If the power setpoint transmitted to said first device (ST1) is strictly less than the maximum permissible equivalent isotropically radiated power, allocate the available resources to the first device (ST1) or to other devices (ST2) of the system, - If the power setpoint transmitted to said first device (ST1) is strictly greater than the the maximum permissible equivalent isotropic radiated power, reduce the resources allocated to the first device (ST1).
    [0010]
    10. The satellite communication system according to one of claims 7 to 9 wherein said control equipment (EC) comprises a loop of power control of said first device (ST1) configured to adjust the power setpoint transmitted to said first device (ST1) according to the resources allocated to said first device (ST1) and a signal-to-noise ratio target measured on the link between said first device (ST1) and said second device (ST2)
    [0011]
    11. The satellite communication system according to one of claims 7 to 10 wherein the allocated communications resources are flow rate or spectral efficiency resources.
    [0012]
    A method of controlling the allocated resources within a satellite communication system comprising at least one satellite communication device (ST1) and a control equipment (EC) of the resources within said system, said method comprising the steps following: - Calculate (301) periodically an equivalent isotropic radiated power setpoint as a function of a target link budget to be reached on the satellite link between a first communication device (ST1) and a second communication device (ST2), - Performing (302) a plurality of measurements of the equivalent isotropically radiated power of the antenna of said first device (ST1), - calculating (303) averaging over a first time interval of said plurality of power measurements, - computing ( 304) averaging, over a second time interval substantially identical to said first time interval, said power setpoints, - calculating (305) the difference between the average of the power setpoints and the average of the power measurements, - allocate (306) more or less communication resources to said first device (ST1) or to other devices (ST2) of the system according to said deviation.
    [0013]
    13. Resource control method according to claim 12 further comprising a step of updating the maximum permissible equivalent isotropic radiated power by adding said power deviation.
    [0014]
    14. The resource control method according to claim 13, further comprising the following resource allocation decision step: if the power setpoint transmitted to said first device (ST1) is strictly less than the maximum equivalent isotropically radiated power , allocate the available resources to the first device (ST1) or to other devices (ST2) of the system, - If the power setpoint transmitted to the first device (ST1) is strictly greater than the maximum equivalent isotropically radiated power, reduce the resources allocated to said first device (ST1).
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    同族专利:
    公开号 | 公开日
    EP2879305B1|2016-11-02|
    SG10201407811TA|2015-06-29|
    US9814004B2|2017-11-07|
    EP2879305A1|2015-06-03|
    US20150156734A1|2015-06-04|
    FR3014270B1|2016-01-01|
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    法律状态:
    2015-10-23| PLFP| Fee payment|Year of fee payment: 3 |
    2016-10-28| PLFP| Fee payment|Year of fee payment: 4 |
    2018-08-31| ST| Notification of lapse|Effective date: 20180731 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1302784A|FR3014270B1|2013-11-29|2013-11-29|SATELLITE COMMUNICATION DEVICE, SATELLITE COMMUNICATION SYSTEM COMPRISING SUCH A DEVICE AND METHOD OF MANAGING RESOURCES ALLOCATED WITHIN SUCH A SYSTEM|FR1302784A| FR3014270B1|2013-11-29|2013-11-29|SATELLITE COMMUNICATION DEVICE, SATELLITE COMMUNICATION SYSTEM COMPRISING SUCH A DEVICE AND METHOD OF MANAGING RESOURCES ALLOCATED WITHIN SUCH A SYSTEM|
    SG10201407811TA| SG10201407811TA|2013-11-29|2014-11-25|Satellite communication device, satellite communication system comprising such a device and method for managing the resources allocated within such a system|
    EP14194784.6A| EP2879305B1|2013-11-29|2014-11-25|Resource management in a satellite communication system by monitoring the effective isotropic radiated power emitted by a terminal.|
    US14/554,670| US9814004B2|2013-11-29|2014-11-26|Satellite communication device, satellite communication system comprising such a device and method for managing the resources allocated within such a system|
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