KR102499159B1 - Low earth orbit satellite and method for allocating offset group beam thereof - Google Patents

Abstract

According to the present invention, a low-orbit communication satellite comprises: a beam group dividing unit for dividing a predetermined frequency band into a plurality of color frequency band-based beam groups; and a beam group allocating unit for allocating an N^th (N is a natural number) beam group among the divided beam groups to a target area and allocating an (N+1)^th beam group based on a color different from that of the N^th group to the target area after the N^th beam group is allocated.

Description

Low Earth Orbit Communication Satellite and its Offset Group Beam Allocation Method

The present invention relates to a low-orbit communication satellite and an offset group beam allocation method thereof. ) Allocation method solves the problem of Co-Channel Interference, which is the biggest disadvantage of FCA, and additionally overcomes the inflexibility of beam resource allocation, which is an additional disadvantage of FCA, through dynamic beam sweeping technique It relates to a low earth orbit communication satellite and an offset group beam allocation method thereof.

Conventional beam allocation techniques are classified into a fixed cell allocation (FCA) method for fixing a beam and a dynamic cell allocation (DCA) method for dynamically allocating a beam. 1 is a diagram illustrating an FCA method of fixedly allocating a beam among conventional beam allocation techniques. 2 is a diagram illustrating a DCA method of dynamically allocating beams among conventional beam allocation techniques.

As shown in FIG. 1, the FCA method continuously allocates a fixed beam to each region (cell) on the ground. This FCA method supports stable communication and stable handover according to fixed beam allocation. However, as beam resources are always fixedly allocated, flexibility and responsiveness to additional resource requests are reduced. Continuous use may result in wastage of resources.

On the other hand, the DCA method, as shown in FIG. 2, is a method of allocating beams while hopping for a pre-planned time based on the resource demand of the terrestrial terminal. This DCA method has the advantage of increasing the overall available user capacity by dynamically allocating satellite beam resources in areas with low demand to areas with high demand by dynamically allocating beams. As a representative method of such DCA, there is a beam hopping method of DVB-S2X.

However, the DCA method has clear theoretical advantages, but its practical implementation is poor, so the technology of 10 years ago has not yet been commercialized. That is, in order to time-divisionally apply simultaneous beam allocation through multiple beams to a single beam, processing as fast as the number of multiple beams is required, making implementation in a satellite payload difficult.

In addition, the space in which data is to be stored increases, requiring additional hardware space of the payload. In particular, inter-beam handover and inter-satellite handover are frequently performed in low earth orbit communication satellites that operate multi-satellites. In this case, time delay and instability of communication connection due to dynamic resource allocation may cause communication disconnection of high-speed terminals on the ground or aircraft and drones. It is a technology that needs to be supplemented as it can affect the survivability of

Meanwhile, in satellite communication, the maximum strength at which satellite signals can be received on the ground is limited by the ITU-R PFD (Power Flux Density) regulation. That is, the effective isotropicadiated power (EIRP) output from the satellite per signal bandwidth is limited.

In the case of multi-beam allocation, when the satellite transmission and EIRP are close to the terrestrial PFD standards to provide maximum output, DCA's beam hopping technology requires that the single-beam output EIRP for beam hopping must be transmitted with the output added by the number of multi-beam EIRPs to achieve throughput (throughput) is maintained. That is, if multi-beams using 4 beams are implemented in a beam hopping method using 1 beam, the power per beam of beam hopping must provide an EIRP output that is 6dB (4 times) higher than the power per beam of multi-beams. , which is limited by PFD regulations and consequently cannot sustain throughput.

In addition, since the DCA method does not continuously steer the beam, when the ground terminal is a fast mobile terminal rather than a fixed terminal, it may cause problems such as increased performance variability such as communication instability and communication speed degradation due to frequent handover.

This characteristic may appear as a communication delay phenomenon due to temporary disconnection and reconnection of communication, and may be less sensitive in non-real-time data or Internet data communication. However, it can be a fatal disadvantage in areas where real-time performance is required or transmission speed must be maintained at all times, especially in military tactical satellite communication. For example, if the continuity of communication such as aircraft, unmanned drones, and self-destruct drones is not guaranteed, the risk of accidents as well as survival increases. In other words, caution is required in these military applications because the DCA method can cause a very dangerous situation.

The problem to be solved by the present invention is an offset group-beam allocation method in which a frequency bandwidth of a beam is frequency-divided and a plurality of groups without cross-frequency interference are sequentially allocated based on an offset, thereby maximizing FCA. A low-orbit communication satellite and its offset group beam allocation that solves the Co-Channel Interference problem, which is a disadvantage, and can overcome the inflexibility of beam resource allocation, which is an additional disadvantage of FCA, through a dynamic beam sweeping technique. is to provide a way

In addition, an embodiment of the present invention is a low-orbit communication satellite and an offset group beam allocation method thereof, which can increase the real implementation of a satellite payload by mitigating the high-speed processing problem of the disadvantage of DCA by simultaneously processing a plurality of beams in parallel. is to provide

However, the problem to be solved by the present invention is not limited to the above problem, and other problems may exist.

A method for allocating an offset group beam for a low earth orbit communication satellite according to a first aspect of the present invention for solving the above problems includes dividing a predetermined frequency band into a plurality of color frequency band-based beam groups; allocating an Nth (N is a natural number) beam group among the divided beam groups to a target region; and allocating an N+1 th beam group based on a color different from that of the N th beam group to the target region after the assignment of the N th beam group is completed.

In some embodiments of the present invention, the dividing of the predetermined frequency band into a plurality of color frequency band-based beam groups is associated with a predetermined number of color beams included in each beam group for the predetermined bandwidth. Thus, the plurality of beam groups may be divided.

In some embodiments of the present invention, after the assignment of the Nth beam group is completed, allocating the N+1th beam group based on a color different from that of the Nth group to the target region comprises: Beam groups are allocated to all of the plurality of groups, but when all of the plurality of groups are allocated during one cycle, the beam groups may be repeatedly allocated during the next cycle.

In some embodiments of the present invention, after the assignment of the Nth beam group is completed, the step of allocating the N+1th beam group based on a color different from that of the Nth group to the target region comprises: A step of dynamically allocating a beam group according to a beam steering time to at least one target region among target regions corresponding to the th beam group may be included.

In some embodiments of the present invention, the step of dynamically allocating a beam group according to a beam steering time to at least one target area among target areas corresponding to the N th beam group includes the N+1 th beam group. reducing a beam steering time by 1-X for a beam group corresponding to an area where there is no resource request; and increasing the beam steering time by the reduced +X for a beam group corresponding to an additional resource-requiring region among the N-th beam groups.

In some embodiments of the present invention, the step of dynamically allocating a beam group according to a beam steering time to at least one target area among target areas corresponding to the N th beam group includes the N+1 th beam group. reducing a beam steering time by 1-Y for a beam group corresponding to an area where there is no resource request; and increasing the beam steering time by the reduced +Y for a beam group corresponding to an additional resource-requiring region among the N-th beam groups.

In addition, the low earth orbit communication satellite according to the second aspect of the present invention includes a beam group divider for dividing a predetermined frequency band into a plurality of color frequency band-based beam groups and an N-th (N is a natural number) of the divided beam groups. ) Beam group allocator for allocating a beam group to a target area, and allocating an N+1 th beam group based on a color different from that of the N th group to the target area after the allocation of the N th beam group is completed include

In some embodiments of the present invention, the beam group divider may divide the plurality of beam groups in association with a predetermined number of color beams included in each beam group with respect to the predetermined bandwidth.

In some embodiments of the present invention, the beam group assigning unit allocates beam groups to all of the divided groups, and when all of the plurality of groups are all allocated during one cycle, repeats during the next cycle The beam group may be allocated.

In some embodiments of the present invention, the beam group assigning unit may dynamically allocate a beam group according to a beam steering time to at least one target region among target regions corresponding to the Nth beam group.

In some embodiments of the present invention, the beam group allocator reduces a beam steering time by 1-X for a beam group corresponding to a region without a resource request among the N+1 th beam groups, and Beam steering time may be increased by the reduced +X targeting a beam group corresponding to an additional resource-requiring region among the th beam group.

In some embodiments of the present invention, the beam group allocator reduces a beam steering time by 1-Y for a beam group corresponding to a region without a request for resources among the N+1 th beam groups, and The beam steering time may be increased by the reduced +Y targeting a beam group corresponding to an additional resource-requiring region among the th beam group.

A computer program according to another aspect of the present invention for solving the above problems is combined with a computer that is hardware to execute the offset group beam allocation method for low-orbit communication, and is stored in a computer-readable recording medium.

Other specific details of the invention are included in the detailed description and drawings.

The prior art has advantages and disadvantages as FCA and DCA methods, respectively. That is, the FCA method provides stability and real-time performance of network operation, but has a disadvantage in that it cannot satisfy co-channel interference between beams and dynamic resource requirements. On the other hand, the DCA method satisfies dynamic resource requirements, but has not been put to practical use in low-orbit satellite communication until now due to an increase in delay time and beam processing speed due to dynamic beam resource allocation.

In contrast, an embodiment of the present invention is to solve this problem, and through four color group beam allocation, simultaneous channel interference between beams is prevented during multi-beam antenna operation of a low-orbit communication satellite to improve SNR and frequency reusability. It also increases (basically 4 beams simultaneously) to provide the effect of increasing the throughput transmission capacity per satellite, and improves power consumption by lowering the signal processing clock speed of the satellite-mounted signal processing unit (OBP). Provides an effect that facilitates sex.

In addition, an embodiment of the present invention enables the transmission RF system to support only 4 beams at the same time and provides a 16-beam effect by applying a switching method between the transmission signal output and the antenna system. It can also provide weight and launch cost reduction effects.

In addition, unlike the beam hopping method, an embodiment of the present invention can be operated without an ESA, which is an electronic beam steering antenna, and can provide a beam operating effect such as beam hopping in conjunction with an already commercialized arbitrary antenna system. It is possible to build an effective low-orbit multi-beam cluster satellite communication network for military use or for civil communication networks requiring high stability.

In addition, since an embodiment of the present invention can provide dynamic beam resource allocation capability by applying a beam sweeping technique together, it is possible to increase available subscriber capacity by minimizing waste of beam resources.

In conclusion, an embodiment of the present invention enables high-capacity high-speed transmission by eliminating simultaneous channel interference, improves power consumption by lowering the processing speed of a satellite payload, improves practicality by reducing the complexity of implementation, and improves system and network operation. It can provide an effect that can increase both stability and flexibility.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description below.

The accompanying drawings are provided to aid understanding of the present embodiment, and provide embodiments along with detailed descriptions. However, the technical features of this embodiment are not limited to specific drawings, and features disclosed in each drawing may be combined with each other to form a new embodiment.
1 is a diagram illustrating an FCA method of fixedly allocating a beam among conventional beam allocation techniques.
2 is a diagram illustrating a DCA method of dynamically allocating beams among conventional beam allocation techniques.
3 is a block diagram of a low earth orbit communication satellite according to an embodiment of the present invention.
4 is a diagram for explaining an FCA scheme in the prior art.
5 is a diagram for explaining an offset group beam allocation scheme in one embodiment of the present invention.
6 is a diagram for explaining a dynamic beam sweeping method in an embodiment of the present invention.
7 is a diagram illustrating a terrestrial beam footprint when an embodiment of the present invention is applied to cluster satellite operation.
8 is a flowchart of a method for allocating an offset group beam for a low earth orbit communication satellite according to an embodiment of the present invention.

Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, only these embodiments are intended to complete the disclosure of the present invention, and are common in the art to which the present invention belongs. It is provided to fully inform the person skilled in the art of the scope of the invention, and the invention is only defined by the scope of the claims.

Terminology used herein is for describing the embodiments and is not intended to limit the present invention. In this specification, singular forms also include plural forms unless specifically stated otherwise in a phrase. As used herein, "comprises" and/or "comprising" does not exclude the presence or addition of one or more other elements other than the recited elements. Like reference numerals throughout the specification refer to like elements, and “and/or” includes each and every combination of one or more of the recited elements. Although "first", "second", etc. are used to describe various components, these components are not limited by these terms, of course. These terms are only used to distinguish one component from another. Accordingly, it goes without saying that the first element mentioned below may also be the second element within the technical spirit of the present invention.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used with meanings commonly understood by those skilled in the art to which the present invention belongs. In addition, terms defined in commonly used dictionaries are not interpreted ideally or excessively unless explicitly specifically defined.

The present invention relates to a low earth orbit communication satellite and an offset group beam allocation method thereof.

In the use of multiple beams for low-orbit communication satellites, the present invention can increase throughput per satellite by increasing frequency reusability while minimizing interference between beams, and additionally, flexible allocation of satellite beam resources and dynamic Supplementing the allocation can ensure effective use of satellite resources.

Hereinafter, a low earth orbit communication satellite 100 according to an embodiment of the present invention will be described with reference to FIG. 3 .

3 is a block diagram of a low earth orbit communication satellite 100 according to an embodiment of the present invention.

The low earth orbit communication satellite 100 according to an embodiment of the present invention is intended to alleviate the disadvantages of DCA while supplementing the disadvantages of FCA, and includes a beam group division unit 110 and a beam group allocation unit 120.

The beam group divider 110 divides a predetermined frequency band into a plurality of color frequency band-based beam groups.

The beam group allocator 120 allocates a first beam group among the divided beam groups to the target region. After the first beam group is allocated, a second beam group based on a color different from that of the first group is allocated to the target area. The beam group allocator may allocate all of the divided beam groups to the target region.

4 is a diagram for explaining an FCA scheme in the prior art. 5 is a diagram for explaining an offset group beam allocation scheme in one embodiment of the present invention. 6 is a diagram for explaining a dynamic beam sweeping method in an embodiment of the present invention.

An embodiment of the present invention is to overcome the disadvantages of the FCA method of FIG. 4, and proposes two beam resource allocation methods of FIGS. 5 and 6. At this time, FIG. 5 shows an example of an offset group beam allocation scheme that minimizes co-channel interference, which is a disadvantage of multi-beam operation, and FIG. 6 shows an offset group that overcomes another disadvantage of multi-beam operation, inflexibility of beam allocation. An example of a dynamic beam sweeping method in a beam allocation method is shown.

First, referring to FIG. 4, in the fixed beam allocation method, assuming that the terrestrial beam footprint is composed of 16 cells, each cell corresponds to the terrestrial footprint of multiple beams of the satellite. When 16 beams are operated simultaneously, a 1 GHz band can be frequency-divided into 250 MHz for each beam and divided into 4 color beams.

The FCA method of FIG. 4 can increase transmission capacity per satellite by maximizing frequency reusability when 16 multi-beams are fixedly operated. Noise Ratio) is limited. At this time, in the FCA method of FIG. 4, the reusability is 4, and the 1 GHz band is used as 4 GHz to provide a frequency increase effect of 4 times.

In order to solve this problem, an embodiment of the present invention removes interference between beams by temporally circularly allocating beam groups divided into a plurality of (eg, four) frequency bands in an offset manner as shown in FIG. can That is, when the beam groups are divided into four beam groups, the beam groups are sequentially and repeatedly allocated from step 1 to step 4. In this case, the beam group divider 110 according to an embodiment of the present invention may divide a plurality of beam groups in association with a predetermined number of color beams included in each beam group with respect to a predetermined bandwidth.

Meanwhile, the beam group allocator 120 may allocate a beam group to all of the plurality of divided groups. At this time, the beam group assigning unit 120 may repeatedly allocate beam groups during the next cycle when all of the plurality of groups are all assigned during one cycle.

For example, in the case of dividing into 4 beam groups, the 4 beam groups are allocated to the target area in sequential or random order, and when all of the 4 beam groups are allocated, one cycle of operation is completed, The operation of the next cycle can be performed.

The FCA method of always allocating 16 beams may cause a problem of interference on the contour of beams due to a narrow interval between beams of the same color. In contrast, according to the beam group allocation method of the present invention, the same color is not repeated at each stage within one period, so that inter-beam interference can be eliminated. Accordingly, even when the satellite transmits the maximum EIRP per beam, the carrier to noise ratio (CNR) does not decrease, and the transmission speed increases in proportion to the strength of the EIRP transmitted by the satellite.

FIG. 6 shows a method of dynamically allocating available resources to requested resources for each region on the ground while minimizing interference between beams by applying an additional technique to the offset beam group allocation method of FIG. 5 .

As an embodiment, the beam group assigning unit 120 may dynamically allocate a beam group according to a beam steering time to at least one target region among target regions corresponding to the Nth beam group.

That is, an embodiment of the present invention enables dynamic allocation of resources according to beam steering time by dynamically performing beam sweeping in an area where beam resources are additionally required while basically performing an offset group beam allocation method.

When the dynamic beam sweeping method in the present invention is applied, the four beam groups separated without frequency interference are rotated in an offset method, and the beam maintenance time is dynamically adjusted using beam sweeping when additional resource allocation is requested in the previous local cell. Resources can be allocated flexibly.

Specifically, the beam group assigning unit 120 reduces the beam steering time by (1-X) for the beam group corresponding to the region where there is no resource request among the N+1 th beam group, and reduces the beam steering time by (1-X) to the N th beam group. Beam steering time may be increased by (+X) reduced for a beam group corresponding to an area requiring additional resources.

Similarly, the beam group allocator reduces the beam steering time by (1-Y) for the beam group corresponding to the region where no resource is requested among the N+1 th beam group, and requests additional resources among the N th beam group. The beam steering time may be increased by the reduced (+Y) targeting the beam group corresponding to the area.

That is, the beam group allocator 120 may enable dynamic allocation of resources through beam sweeping that increases a beam steering time in the X or Y direction. As a result, it is possible to provide an effect of increasing the capacity of all available users by minimizing resource waste.

Unlike the beam hopping method of the existing DVB-S2X, this method increases frequency reusability by using multiple beams, enabling large-capacity communication and reducing power consumption by easing the data processing speed in the satellite.

In addition, by reducing the data processing clock speed of the satellite payload, the possibility of implementation is also increased. For example, if multi-beam operation of 16 beams is implemented with the existing beam hopping technology, the transmission EIRP of the satellite must increase 16 times (12dB). However, it is difficult to increase the output due to the PFD regulations of the ITU-R, and since 16 beams must be compressed 16 times in time, the data processing speed must be increased 16 times. This makes it impossible to implement the payload of the Space Ministry, making it difficult to implement even with current technology.

However, since an embodiment of the present invention requires only a 4-fold increase in processing speed compared to simultaneous 16-beam multi-beam operation to simultaneously operate 4 beams, the implementation is increased, and each beam only increases by a maximum of 4 times (6dB). Since this is done, it provides an effect of increasing the implementability of the payload of the Space Department.

In addition, since beams are cyclically operated in a regular offset method, it is easy to predict beam steering in a terrestrial terminal, thereby minimizing resource allocation time and resource request time, and increasing system safety by facilitating data buffering management.

7 is a diagram illustrating a terrestrial beam footprint when an embodiment of the present invention is applied to cluster satellite operation.

As shown in FIG. 7, the distance between beams of the same color is wide enough to minimize co-channel interference between beams even in the operation of cluster satellites, making it easy to secure CNR and enabling high-capacity communication.

In addition, in an embodiment of the present invention, beam allocation is cyclically repeated with cluster satellites having the same offset for each step, thereby minimizing interference between beams, and during this operation, a dynamic beam sweeping technique is additionally applied to cluster satellites. It can also satisfy resource allocation efficiency during operation.

Hereinafter, a method of allocating an offset group beam for the low earth orbit communication satellite 100 according to an embodiment of the present invention will be described with reference to FIG. 8 .

8 is a flowchart of a method for allocating an offset group beam for the low earth orbit communication satellite 100 according to an embodiment of the present invention.

In an embodiment of the present invention, first, a predetermined frequency band is divided into a plurality of color frequency band-based beam groups (S110).

Next, the Nth (N is a natural number) beam group among the divided beam groups is allocated to the target region (S120).

Next, after the assignment of the Nth beam group is completed, the N+1th beam group based on a color different from that of the Nth group is assigned to the target region (S130).

Meanwhile, in the above description, steps S110 to S130 may be further divided into additional steps or combined into fewer steps according to an embodiment of the present invention. Also, some steps may be omitted if necessary, and the order of steps may be changed. In addition, even if other omitted contents, the contents described in FIGS. 3 to 7 are also applied to the offset group beam allocation method of FIG. 8 .

The offset group beam allocation method for the low earth orbit communication satellite 100 according to an embodiment of the present invention described above may be implemented as a program (or application) to be executed in combination with a computer, which is hardware, and stored in a medium. .

The above-mentioned program is C, C++, JAVA, Ruby, C, C++, JAVA, Ruby, which the processor (CPU) of the computer can read through the device interface of the computer so that the computer reads the program and executes the methods implemented as a program. It may include a code coded in a computer language such as machine language. These codes may include functional codes related to functions defining necessary functions for executing the methods, and include control codes related to execution procedures necessary for the processor of the computer to execute the functions according to a predetermined procedure. can do. In addition, these codes may further include memory reference related codes for which location (address address) of the computer's internal or external memory should be referenced for additional information or media required for the computer's processor to execute the functions. there is. In addition, when the processor of the computer needs to communicate with any other remote computer or server in order to execute the functions, the code uses the computer's communication module to determine how to communicate with any other remote computer or server. It may further include communication-related codes for whether to communicate, what kind of information or media to transmit/receive during communication, and the like.

The storage medium is not a medium that stores data for a short moment, such as a register, cache, or memory, but a medium that stores data semi-permanently and is readable by a device. Specifically, examples of the storage medium include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, etc., but are not limited thereto. That is, the program may be stored in various recording media on various servers accessible by the computer or various recording media on the user's computer. In addition, the medium may be distributed to computer systems connected through a network, and computer readable codes may be stored in a distributed manner.

The above description of the present invention is for illustrative purposes, and those skilled in the art can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be construed as being included in the scope of the present invention. do.

100: low earth orbit communication satellite
110: beam group dividing unit
120: beam group assignment unit

Claims (12)

In the method of allocating an offset group beam for a low-orbit communication satellite,
dividing a predetermined frequency band into a plurality of color frequency band-based beam groups;
allocating an Nth (N is a natural number) beam group among the divided beam groups to a target region; and
After the assignment of the Nth beam group is completed, allocating an N+1th beam group based on a color different from that of the Nth group to the target region, comprising: assigning an offset group beam for a low earth orbit communication satellite method.
According to claim 1,
The step of dividing the predetermined frequency band into a plurality of color frequency band-based beam groups,
and dividing the plurality of beam groups in association with a predetermined number of color beams included in each beam group for the predetermined bandwidth.
According to claim 1,
After the assignment of the Nth beam group is completed, allocating the N+1th beam group based on a color different from that of the Nth group to the target region,
A beam group is allocated to all of the plurality of divided groups, and when all of the plurality of groups are all allocated during one period, the beam group is repeatedly allocated during the next period. Offset group beam allocation method.
According to claim 1,
After the assignment of the Nth beam group is completed, allocating the N+1th beam group based on a color different from that of the Nth group to the target region,
and dynamically allocating a beam group according to a beam steering time to at least one target region among target regions corresponding to the N-th beam group.
According to claim 4,
The step of dynamically allocating a beam group according to a beam steering time to at least one target area among target areas corresponding to the Nth beam group,
reducing a beam steering time by 1-X for a beam group corresponding to an area where no resource is requested among the N+1 th beam groups; and
and increasing a beam steering time by the reduced +X for a beam group corresponding to an additional resource-requiring region among the N-th beam groups.
According to claim 4,
The step of dynamically allocating a beam group according to a beam steering time to at least one target area among target areas corresponding to the Nth beam group,
reducing a beam steering time by 1-Y for a beam group corresponding to an area where no resource is requested among the N+1 th beam groups; and
Increasing the beam steering time by the reduced +Y targeting a beam group corresponding to an additional resource-requiring region among the N-th beam groups,
Offset group beam allocation method for low earth orbit communication satellite.
A beam group divider for dividing a predetermined frequency band into a plurality of color frequency band-based beam groups; and
An Nth beam group (where N is a natural number) among the divided beamgroups is allocated to a target region, and after the Nth beamgroup is allocated, the N+1th beam group is based on a color different from that of the Nth group. A low earth orbit communication satellite comprising a beam group allocator for allocating a beam group to the target region.
According to claim 7,
Wherein the beam group divider divides the plurality of beam groups in association with a predetermined number of color beams included in each beam group for the predetermined bandwidth.
According to claim 8,
The beam group assigning unit allocates beam groups to all of the divided groups, and repeatedly allocates the beam groups during the next period when all of the plurality of groups are all allocated during one cycle, Low Earth Orbit Communications Satellite.
According to claim 8,
Wherein the beam group allocator dynamically allocates a beam group according to a beam steering time to at least one target region among target regions corresponding to the N-th beam group.
According to claim 10,
The beam group allocator reduces a beam steering time by 1-X for a beam group corresponding to an area in which no resource is requested among the N+1 th beam group, and in an area requiring additional resources among the N th beam group. To increase the beam steering time by the reduced +X for the corresponding beam group, the low-orbit communication satellite.
According to claim 10,
The beam group allocator reduces a beam steering time by 1-Y for a beam group corresponding to an area without a resource request among the N+1 th beam group, and in an area requiring additional resources among the N th beam group. To increase the beam steering time by the reduced +Y targeting the corresponding beam group, the low-orbit communication satellite.

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