WO2020158044A1 - Procédé d'attribution de ressources et satellite de communication - Google Patents

Procédé d'attribution de ressources et satellite de communication Download PDF

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Publication number
WO2020158044A1
WO2020158044A1 PCT/JP2019/037901 JP2019037901W WO2020158044A1 WO 2020158044 A1 WO2020158044 A1 WO 2020158044A1 JP 2019037901 W JP2019037901 W JP 2019037901W WO 2020158044 A1 WO2020158044 A1 WO 2020158044A1
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WIPO (PCT)
Prior art keywords
communication
resource
antenna element
unit
cell
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PCT/JP2019/037901
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English (en)
Japanese (ja)
Inventor
草野　正明
良夫 稲澤
仁深 尾野
聡泰 角田
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三菱電機株式会社
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Priority to JP2020569362A priority Critical patent/JP7154318B2/ja
Publication of WO2020158044A1 publication Critical patent/WO2020158044A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/06—Airborne or Satellite Networks

Definitions

  • the present invention relates to a resource allocation method applied to wireless communication and a communication satellite capable of realizing the resource allocation method.
  • HetNet Heterogeneous Network
  • a plurality of small cells are constructed in a macro cell to increase the capacity of a communication system
  • Patent Document 1 Currently, in a terrestrial cellular network, HetNet (Heterogeneous Network) is being considered in which a plurality of small cells are constructed in a macro cell to increase the capacity of a communication system (see, for example, Patent Document 1). With this HetNet, it becomes possible to accommodate high traffic in a small cell covering a narrow area while maintaining connectivity of mobile communication in a macro cell covering a wide area.
  • HetNet in the terrestrial cellular network, it is necessary to physically install a base station including an antenna device so that a small cell can be constructed. Therefore, in order to provide a high-quality communication service in a macro cell in which an area with high traffic occurs or the area changes depending on the situation, install more base stations or install more base stations. It needs to be moved as needed. However, it is not easy to appropriately determine the shape including the position and the size of the area to be covered by the small cell, because the traffic volume may change depending on the situation. From this, in HetNet, it is also important to easily change the arrangement of the narrow area covered by the small cells in the wide area covered by the macro cells.
  • the present invention has been made in order to solve such a problem, and an object thereof is to provide a resource allocation method and a communication satellite in which the arrangement of narrow areas within a wide area can be easily changed.
  • a resource allocation method allocates a first communication resource to a first beam that a communication satellite irradiates toward the ground by digital beam forming, and a first beam within a first area covered by the first beam.
  • the second communication resource different from the first communication resource is allocated to the second beam that covers the second area smaller than the area of 1), and the communication satellite is irradiated with the second beam by digital beam forming.
  • a communication satellite includes a first antenna element group for irradiating a beam toward the ground by digital beam forming, and a second antenna element group for receiving an electromagnetic wave emitted from a wireless device capable of receiving the beam.
  • a transmission processing unit capable of causing the antenna element group and each antenna element forming the first antenna element group to radiate an electromagnetic wave with a set communication resource, and each antenna element forming the second antenna element group
  • a reception processing unit that performs processing according to the set communication resource for the received signal output from the transmission processing unit, and a resource allocation unit that allocates communication resources to the reception processing unit in antenna element units. I have it.
  • FIG. 3 is a diagram illustrating a communication system to which the resource allocation method according to Embodiment 1 of the present invention can be applied, and an example of communication resource allocation to each cell by the resource allocation method.
  • FIG. 6 is a diagram illustrating an example of allocating communication resources to each cell by the resource allocation method according to the second embodiment of the present invention. It is a figure explaining the example of a time resource.
  • FIG. 9 is a diagram illustrating an example of allocating communication resources to each cell by the resource allocating method according to the third embodiment of the present invention. It is a figure explaining the example of a change of the content of a frequency resource. It is a figure explaining the example of allocation of the communication resource to each cell by the resource allocation method which concerns on Embodiment 4 of this invention.
  • FIG. 1 is a diagram illustrating a communication system to which the resource allocation method according to Embodiment 1 of the present invention can be applied, and an example of communication resource allocation to each cell by the resource allocation method.
  • the resource allocation method is applied to a communication system that provides a communication service that relays communication satellites.
  • a communication satellite that includes an antenna device in which a plurality of antenna elements, which are primary radiators capable of radiating electromagnetic waves to be a beam, are arranged in an array, and forms a beam by digital beam forming (DBF) is an arbitrary area on the ground. It is possible to irradiate a beam to which the communication resources of It is possible to easily form a beam for irradiating a wide area and also a beam for irradiating a narrow area within the wide area which is narrower than the wide area, and to cancel the formation. It is possible to easily change the shape including the position and size of the narrow area.
  • the resource allocation method is applied to the communication system that provides the communication service that relays the communication satellite.
  • the excitation phase and the excitation amplitude of the transmission signal supplied to each antenna element are controlled by digital signal processing, and it is possible to irradiate a beam of an arbitrary size in an arbitrary irradiation direction.
  • 10 is a communication satellite equipped with a DBF function
  • 11 is a ground station
  • 12 is a macrocell
  • 13-1 to 13-3 are small cells.
  • the area of the macro cell 12 corresponds to the first area
  • the beam covering the macro cell 12 corresponds to the first beam.
  • the communication resource assigned to the macro cell 12, or more precisely, the beam covering the macro cell 12, corresponds to the first communication resource.
  • Each area of each small cell 13-1 to 13-3 corresponds to the second area, and the beam that covers each small cell 13-1 to 13-3 corresponds to the second beam.
  • the area of each of the small cells 13-1 to 13-3 is much smaller than the area of the macro cell 12.
  • the “cell” when referring to the macro cell 12 and the small cells 13-1 to 13-3, or when the target one of the macro cell 12 and the small cells 13-1 to 13-3 cannot be specified, the “cell ". When there is no need to specify any of the small cells 13-1 to 13-3, it will be referred to as “small cell 13”. This also applies to the embodiments described later.
  • Fig. 1 shows an example of communication resources allocated to the beam radiated toward the ground.
  • a wireless device specifically, a mobile station or a fixed station existing in each cell irradiated with a beam also transmits a signal using the corresponding communication resource. Therefore, here, description will be made focusing on the allocation of communication resources to the beams emitted by the communication satellite 10.
  • the mobile station includes, for example, an aircraft, a ship, a mobile phone carried by a user, and the like.
  • the mobile station is used as a general term for wireless devices that the communication satellite 10 communicates with.
  • frequency resources are assumed as communication resources to be allocated.
  • This frequency resource can differ in at least one of a frequency band and a type of polarization.
  • “F1” and “F2” in FIG. 1 represent different frequency resources.
  • FIG. 1 shows that the frequency resource F1 is assigned to the macro cell 12 and the frequency resource F2 is assigned to each small cell 13 in the macro cell 12.
  • the same frequency resource F2 is allocated to each small cell 13 because the small cells 13 are arranged at positions distant from each other.
  • HetNet that provides high quality communication service is realized.
  • the macro cell 12 can maintain the mobile communication connectivity, and each small cell 13 can accommodate high traffic.
  • Such allocation of communication resources is effective in the macro cell 12 in which an area having high traffic appears in a distant position depending on the situation, for example, the time zone.
  • the communication resources are only frequency resources.
  • the communication resources include frequency resources and time resources for limiting the communicable range in the time domain. By further including the time resource in the communication resource, it becomes possible to further suppress the occurrence of interference between the beams as compared with the first embodiment.
  • FIG. 2 is a diagram illustrating an example of allocating communication resources to each cell by the resource allocating method according to the second embodiment of the present invention.
  • T1 and T2 represent different time resources.
  • the four small cells 21-1 to 21-4 in the macro cell 20 are arranged at positions distant from each other. Therefore, similar to the first embodiment, the communication resources of the frequency resource F1 and the time resource T2 are assigned to all the small cells 21. Communication resources of a frequency resource F1 and a time resource T1 are assigned to the macro cell 20.
  • FIG. 3 is a diagram illustrating an example of a time resource. Next, with reference to FIG. 3, the time resource whose allocation can be changed in the second embodiment will be specifically described.
  • -Time resources are resources for limiting the communicable range in the time domain as described above.
  • a control unit period P which is a control period that serves as a unit for limiting the communicable range in the time domain, is provided, and the control unit period P is divided into two.
  • the arrangement of the time resources T1 and T2 within the control unit period P is T1 ⁇ T2 from the beginning.
  • the periods 22-1 and 23-1 shown in FIG. 3 are obtained by dividing a certain control unit period P into two, and the periods 22-2 and 23-2 indicate the next control unit period P. It is obtained by dividing into two.
  • the periods 22-3 and 23-3 are obtained by further dividing the next control unit period P into two, and the periods 22-4 and 23-4 are further obtained by dividing the next control unit period P into two. It was obtained by doing.
  • the periods 22-1 to 22-4 are assigned to the time resource T1 and the periods 23-1 to 23-4 are assigned to the time resource T2.
  • the time resource T1 is also referred to as “time division slot T1”. Only when pointing to a specific time division slot, the symbol corresponding to the time division slot is also written. This also applies to frequency resources.
  • Embodiment 3 In the above-described first and second embodiments, since the small cells are arranged at the distant positions, the same communication resource is assigned to all the small cells.
  • the third embodiment is adapted to cope with a situation where two or more small cells overlap by adding a small cell.
  • FIG. 4 is a diagram illustrating an example of allocating communication resources to each cell by the resource allocating method according to the third embodiment of the present invention.
  • FIG. 4 shows an example in which small cells 32-1 and 32-2 are added in the situation where communication resources are allocated to each cell as shown in FIG.
  • the small cells 31-1 to 31-4 are already existing small cells.
  • the small cell 32-1 has portions overlapping with the small cells 31-2 and 31-3
  • the small cell 32-2 has portions overlapping with the small cells 31-3 and 31-4. To do. Therefore, when the same communication resource as that of the other small cells 31 is assigned to the small cells 32-1 and 32-2, the communication quality is deteriorated due to the interference between the beams in the overlapping portion and the periphery thereof. From this, in the third embodiment, by increasing the frequency resources from two of F1 and F2 to three of F1′ to F3′ and changing the communication resources of all cells, the communication can be performed. It avoids quality deterioration. Therefore, as shown in FIG. 4, a frequency resource F1′ is newly allocated to the macro cell 30, a frequency resource F2′ is newly allocated to each small cell 31, and a frequency resource F3′ is allocated to the small cell 32. ..
  • FIG. 5 is a diagram illustrating an example of changing the contents of frequency resources.
  • FIG. 5 a specific example of changing the content when the frequency resources are increased from two of F1 and F2 to three of F1′ to F3′ will be specifically described.
  • the frequency resources F1 and F2 are assigned frequency bands 33-1 and 33-2 obtained by dividing the total bandwidth into two, as shown in FIG. 5, for example.
  • the total bandwidth is divided into three frequency bands 34-1 to 34-3, and the frequency bands 34-1 to 34-3 are frequency resources F1′. To F3', respectively.
  • communication resources are allocated so that interference between beams does not occur in response to the addition of the small cell 32 as shown in FIG.
  • changing frequency resources is not limited to that shown in FIG.
  • the frequency resource is changed in this way, it is possible to avoid changing the allocation of the communication resource of the macro cell 30.
  • the frequency resource F2' is newly allocated to the small cell 31-1. Since the small cell 31-1 does not have a portion overlapping with other small cells, the frequency resource F3' may be allocated in addition to the frequency resource F2'.
  • the communication resource allocation of each cell may be changed. Because of this, the option to change the allocation of communication resources may be selected according to the small cell to be deleted.
  • the communication resources include frequency resources and time resources. Since the small cells 21 are arranged so as not to overlap other small cells 21, the same communication resource is assigned to all of the small cells.
  • the fourth embodiment is adapted to cope with a situation in which two or more small cells are overlapped by adding a small cell.
  • FIG. 6 is a diagram illustrating an example of allocating communication resources to each cell by the resource allocating method according to the fourth embodiment of the present invention.
  • FIG. 6 shows an example in which small cells 42-1 and 42-2 are added when communication resources are allocated to each cell as shown in FIG.
  • the small cells 41-1 to 41-4 are already existing small cells.
  • the small cell 42-1 has a portion overlapping with the small cells 41-2 and 41-3
  • the small cell 42-2 has a portion overlapping with the small cells 41-3 and 41-4. To do. Therefore, when the same communication resources as those of the other small cells 41 are assigned to the small cells 42-1 and 42-2, the communication quality is increased due to the interference between the beams in the overlapping portion and the periphery thereof, as in the third embodiment. to degrade. From this, in the fourth embodiment, by increasing the time resources from two of T1 and T2 to three of T1′ to T3′ and changing the communication resources of all cells, the communication is performed. It avoids quality deterioration. Therefore, as shown in FIG.
  • the time resource of the macro cell 40 is changed from T1 to T1′ while the frequency resource F1 assigned to each cell is left unchanged.
  • the time resource of each small cell 41 is changed from T2 to T2', and the small cell 42 is assigned a frequency resource F1 and a time resource T3'.
  • FIG. 7 is a diagram illustrating an example of changing the content of the time resource.
  • FIG. 7 a specific example of changing contents when the number of time resources is increased from two of T1 and T2 to three of T1′ to T3′ will be specifically described.
  • each control unit period P is divided into two, and each divided period is assigned to the time resources T1 and T2.
  • each control unit period P is divided into three, and the three periods obtained by the division are assigned to the frequency resources T1' to T3', respectively.
  • the periods 43-1, 44-1 and 45-1 shown in FIG. 7 are obtained by dividing a certain control unit period P into three, and the periods 43-2, 44-2 and 45-2 are , Is obtained by dividing the next control unit period P into three.
  • the periods 43-1 and 43-2 are allocated to the time resource T1′, the periods 44-1 and 44-2 are allocated to the time resource T2′, and the periods 45-1 and 45-2 are allocated to the time resource T3′.
  • communication resources are allocated so that interference between beams does not occur in response to the addition of the small cell 42 as shown in FIG.
  • control unit period P may be divided in consideration of the communication traffic amount estimated in the small cell to be added and the communication traffic amount of each existing cell. In such a case, higher quality communication service can be provided.
  • the target whose content is changed is the time resource, but the frequency resource may be the target.
  • the frequency resource may be a target depending on the situation.
  • the communication resource allocation of each cell may be changed. Because of this, the option to change the allocation of communication resources may be selected according to the small cell to be deleted.
  • FIG. 8 is a diagram showing a configuration example of a relay system mounted on a communication satellite according to the fourth embodiment of the present invention.
  • FIG. 9 is a diagram showing a configuration example of a system built in a ground station for managing a communication satellite according to the fourth embodiment of the present invention.
  • the system mounted on the communication satellite 10 includes two antenna devices 51 and 52, two amplifier groups 53 and 54, a channelizer 55, an antenna device 56, a satellite control unit 57, a resource allocation unit 58, and And a communication traffic measuring unit 59.
  • the antenna device 51 is a receiving antenna element group in which a plurality of antenna elements 51a capable of receiving electromagnetic waves are arranged in an array, and corresponds to the second antenna element group.
  • the other antenna device 52 is a transmission antenna element group in which a plurality of antenna elements 52a capable of radiating electromagnetic waves are arranged in an array, and corresponds to the first antenna element group.
  • the amplifier group 53 includes an amplifier for each antenna element 51a. Each amplifier amplifies the received signal input from the connected antenna element 51a. The amplified received signals are all input to the channelizer 55.
  • the amplifier group 54 also includes an amplifier for each antenna element 52a. Each amplifier amplifies the transmission signal input from the channelizer 55 and outputs the amplified transmission signal to the connected antenna element 52a.
  • the channelizer 55 realizes relay of communication between mobile stations, and includes a reception processing unit 61, a switch unit 62, and a transmission processing unit 63.
  • the reception processing unit 61 performs processing according to the communication resource of the received signal for each received signal input from each antenna element 51a, excites and combines the amplitude and phase of the received signal, and responds to the received beam. Generate a signal.
  • the combined signal is output to the switch unit 62.
  • the switch unit 62 collects the input signals on a cell-by-beam basis.
  • the transmission processing unit 63 changes the processing content for each antenna element 52a used for beam irradiation to the same cell.
  • the transmission processing unit 63 performs processing for each cell, that is, for each antenna element used to irradiate a beam to the same cell, according to the communication resource assigned to that cell, and performs processing for forming a beam by the DBF.
  • the transmission signal obtained by performing the processing is input to the amplifier group 54.
  • the transmission signal is amplified by the input amplifier and then radiated as an electromagnetic wave from the antenna element 52a. Since the transmission signal is digitally processed for DBF, a beam is formed for each cell by radiation of electromagnetic waves from each antenna element 52a.
  • the reception processing unit 61 includes an ADC (Analog-to-Digital Converter) group 611, a demultiplexing unit group 612, a demultiplexer group 613, and a DBF receiving unit 614.
  • ADC Analog-to-Digital Converter
  • the ADC group 611 includes an ADC prepared for each antenna element 51a. Accordingly, the ADC group 611 converts the analog reception signal input from the amplifier group 53 into a digital reception signal and outputs the digital reception signal to the demultiplexing unit group.
  • the demultiplexing unit group 612 includes a demultiplexing unit for each antenna element 51a. Thereby, the demultiplexing unit group 612 extracts the signal component for each frequency band and outputs the signal component to the demultiplexer group 613. There are as many output destinations of the signal component as there are time resources, and each demultiplexing unit selects the output destination of the signal component according to the set frequency resource and time resource.
  • the demultiplexer group 613 includes, for each antenna element 51a, a demultiplexer capable of changing the signal component to be selected for each time division slot. Therefore, the demultiplexer group 613 outputs a signal component corresponding to the set frequency resource and the set time resource for each antenna element 51a to the DBF receiving unit 614 as a received signal.
  • the DBF receiving unit 614 performs digital processing for each input received signal and synthesizes a signal corresponding to the beam.
  • the combined signal is output to the switch unit 62, is combined by the switch unit 62 in cell units, and is output to the transmission processing unit as a transmission signal.
  • the transmission processing unit 63 includes a DBF transmission unit 631, a demultiplexer group 632, a multiplexing unit group 633, and a DAC group 634.
  • the DBF transmitter 631 manipulates the excitation phase and the excitation amplitude of the transmission signal by digital processing in cell units, that is, in beam units, and outputs the transmission signal after digital processing to the demultiplexer group 632. By this digital processing, the beam of each cell can be formed with the set frequency resource.
  • the DBF transmission unit 631 is provided with an output destination corresponding to the number of time resources that can be assigned, for example, for each transmission signal, and outputs the transmission signal to an output destination corresponding to the assigned time resource.
  • the demultiplexer group 632 includes a demultiplexer for each antenna element 52a. Each demultiplexer switches the output destination to be selected according to the set time resource, that is, the time division slot. As a result, each demultiplexer outputs the transmission signal to the multiplexing unit group 633 for the period corresponding to the allocated time resource.
  • the DBF transmission unit 631 and the demultiplexer group 632 perform processing according to the allocated time resource. By changing the number of output destinations and the period for switching the output destinations selected by each demultiplexer, it is possible to deal with the change in the content of the time resource. Cell addition, cell deletion, and cell shape change can be handled by digital processing performed by the DBF transmission unit 631.
  • the multiplexing unit group 633 also includes a multiplexing unit for each antenna element 52a.
  • Each multiplexing unit operates the transmission signal according to the allocated frequency resource, and outputs the transmission signal after the operation to the DAC (Digital-to-Analog Converter) group 634. Therefore, the DBF transmission unit 631, the demultiplexer group 632, and the multiplexing unit group 633 perform processing corresponding to the assigned frequency resource. By controlling the DBF transmission unit 631, the demultiplexer group 632, and the multiplexing unit group 633, it is possible to deal with the content change of the frequency resource.
  • the transmission signal output by the DBF transmission unit 631 is a digital signal on the frequency axis.
  • the multiplexing unit converts, for example, the digital signal into a real-time digital signal, and outputs the converted digital signal as a transmission signal.
  • the DAC group 634 also includes a DAC for each antenna element 52a. Each DAC converts the input digital transmission signal into an analog transmission signal. The analog transmission signal is amplified by the amplifier group 54 and then output to the antenna element 52a.
  • the communication satellite 10 can allocate various communication resources, including the allocation of communication resources as shown in FIGS. 1, 2, 4, and 6, and change the allocated communication resources. It can be carried out. Therefore, the communication satellite 10 can flexibly and appropriately cope with addition of cells, deletion of cells, change of shape including cell size, and the like. Thereby, the communication satellite 10 can always provide a high quality communication service.
  • the antenna device 56 is dedicated to communication with the ground station that manages the operation of the communication satellite 10.
  • the ground station is assumed to be the ground station 11 installed in the small cell 13-3 shown in FIG.
  • the satellite control unit 57 connected to the antenna device 56 controls the entire communication satellite 10 and communicates with the ground station 11 via the antenna device 56.
  • the assignment of communication resources to cells, that is, to beams is changed by an instruction from the ground station 11 side.
  • the command transmitted by the ground station 11 for instructing to change the allocation of communication resources will be referred to as “allocation changing command”.
  • the allocation change command includes, for example, placement data in addition to the identification code indicating the type of command.
  • This placement data is data representing, for each cell to be placed, the position of the cell, the shape including the size of the cell, and the communication resource to be assigned to the cell.
  • the resource allocation unit 58 refers to the arrangement data in the allocation change command, for example, to add a cell or delete a cell, and change the necessary allocation of communication resources. I do.
  • the resource allocation unit 58 targets the demultiplexing unit group 612, the demultiplexer group 613, the DBF receiving unit 256, the switch unit 62, the demultiplexer group 632, and the multiplexing unit group 623. Take control and change settings.
  • the communication traffic measuring unit 59 measures the communication traffic amount for each cell, for example. Therefore, the communication traffic measuring unit 59 acquires information necessary for measurement from the resource allocating unit 58.
  • the information to be acquired is, for example, information for identifying, for each cell, the antenna elements 51a and 52a assigned to the cell. By acquiring such information from the resource allocation unit 58, the communication traffic measurement unit 59 can measure the communication traffic amount for each cell. Traffic data indicating the amount of communication traffic measured for each cell is output from the communication traffic measuring unit 59 to the satellite control unit 57.
  • the satellite control unit 57 transmits the traffic data to the ground station 11 via the antenna device 56. Therefore, on the side of the ground station 11, it is possible to change the allocation of communication resources in a timely manner according to the communication traffic amount measured for each cell.
  • a system including an antenna device 71, a transmission/reception unit 72, a control unit 73, a command generation unit 74, an input unit 75, and a storage unit 76 is constructed.
  • the antenna device 71 is dedicated to communication with the communication satellite 10, for example.
  • the transmission/reception unit 72 enables communication with the communication satellite 10 via the antenna device 71. Therefore, when data is input from the control unit 73, modulation is performed using the input data to generate an analog transmission signal, and the generated transmission signal is output to the antenna device 71.
  • the transmission/reception unit 72 demodulates the reception signal to restore the original data, and outputs the restored data to the control unit 73.
  • the control unit 73 controls the operation of the communication satellite 10.
  • the control unit 73 outputs various data including the command to be transmitted to the communication satellite 10 by outputting the data to the transmission/reception unit 72. Further, the control unit 73 inputs and processes the data from the communication satellite 10 restored by the transmitting/receiving unit 72. When the input data is traffic data, the control unit 73 outputs the traffic data to the command generation unit 74.
  • the command generation unit 74 generates various commands to be transmitted to the communication satellite 10 and outputs the generated commands to the control unit 73. This command is input to the transmission/reception unit 72 via the control unit 73. As a result, the command is transmitted to the communication satellite 10.
  • the command generation unit 74 processes the data input from the input unit 75 and also generates necessary commands. In order to generate a command, the command generation unit 74 refers to various data stored in the storage unit 76 as needed.
  • the input unit 75 includes an operation unit 75a operated by an operator and a disaster occurrence notification unit 75b.
  • the operator can cause the command generation unit 74 to generate a desired command by operating the operation unit 75a.
  • This command includes an allocation change command.
  • the operator can input the layout data by operating the operation unit 75a, for example. Therefore, the operator can arbitrarily add a cell, delete a cell, change the shape including the size of the cell, change communication resources assigned to one or more cells, and so on.
  • the disaster occurrence notification unit 75b has a function of notifying the period from the notification of the occurrence of the disaster affecting the macro cell or the danger of the disaster to the normal time.
  • the notification is used for autonomous generation of the allocation change command by the command generation unit 74.
  • that period will be referred to as the “disaster response period”.
  • Examples of disasters include typhoons, heavy rains, heavy snowfalls, volcanic eruptions, earthquakes, and the like.
  • the storage unit 76 stores schedule data 76a, a traffic volume-based allocation data group 76b, and a disaster occurrence allocation data 76c as data to be referenced for generating an allocation change command. These are as follows respectively.
  • the schedule data 76a is data for changing the allocation of communication resources depending on the day of the week, the time of day, etc.
  • the schedule data 76a includes placement data for each time zone including a date, for example.
  • the traffic volume-based arrangement data group 76b is data referred to when traffic data is received from the communication satellite 10.
  • the traffic volume-based arrangement data group 76b includes appropriate arrangement data, for example, for each combination of the upper limit values of the communication traffic amounts of the respective cells. Therefore, the traffic data is used to refer to the traffic volume-based arrangement data group 76b, extract appropriate arrangement data, and generate an allocation change command to autonomously and appropriately change the communication traffic volume of each cell Can correspond to. Therefore, it is effective in reliably maintaining a high quality communication service.
  • the disaster-time arrangement data 76c is arrangement data indicating the allocation contents of communication resources within the disaster response period, and is referred to during the disaster response period.
  • the arrangement data is stored in the generated allocation change command.
  • Arranging such a command generating unit 74 on the side of the ground station 11 suppresses the power consumption of the communication satellite 10, suppresses the cost of the communication satellite 10, and suppresses the influence when a defect occurs in the command generating unit 74. , For that reason.
  • the command generation unit 74 including the storage unit 76 may be mounted on the communication satellite 10. Since the communication traffic amount is measured on the communication satellite 10 side, the communication satellite 10 may be equipped with a command generation unit 74 for generating an allocation change command by referring to the traffic amount-based arrangement data group 76b.
  • the communication resource is not limited to the frequency resource, the time resource and the like as described above.
  • the spreading code is also a changeable communication resource.

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  • Signal Processing (AREA)
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  • Radio Relay Systems (AREA)

Abstract

Dans des communications par l'intermédiaire d'un satellite de communication, une première ressource de communication est attribuée à un premier faisceau que le satellite de communication doit diffuser vers la terre au moyen d'une formation de faisceau numérique; une seconde ressource de communication différente de la première ressource de communication est attribuée à un second faisceau devant être amené à couvrir, dans une première zone couverte par le premier faisceau, une seconde zone plus petite que la première zone; et le satellite de communication est ensuite amené à diffuser le second faisceau au moyen d'une formation de faisceau numérique.
PCT/JP2019/037901 2019-01-30 2019-09-26 Procédé d'attribution de ressources et satellite de communication WO2020158044A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012147753A1 (fr) * 2011-04-28 2012-11-01 三菱電機株式会社 Satellite relais et système de communication par satellite
US20170214500A1 (en) * 2016-01-22 2017-07-27 Space Systems/Loral, Llc Protected Overlay Of Assigned Frequency Channels
JP2017168898A (ja) * 2016-03-14 2017-09-21 ソフトバンク株式会社 通信端末装置、衛星基地局、基地局制御装置及び移動通信システム

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012147753A1 (fr) * 2011-04-28 2012-11-01 三菱電機株式会社 Satellite relais et système de communication par satellite
US20170214500A1 (en) * 2016-01-22 2017-07-27 Space Systems/Loral, Llc Protected Overlay Of Assigned Frequency Channels
JP2017168898A (ja) * 2016-03-14 2017-09-21 ソフトバンク株式会社 通信端末装置、衛星基地局、基地局制御装置及び移動通信システム

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