KR20150039069A - Satellite communication system and method for adaptive frequency assignment - Google Patents

Satellite communication system and method for adaptive frequency assignment Download PDF

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Publication number
KR20150039069A
KR20150039069A KR20140015585A KR20140015585A KR20150039069A KR 20150039069 A KR20150039069 A KR 20150039069A KR 20140015585 A KR20140015585 A KR 20140015585A KR 20140015585 A KR20140015585 A KR 20140015585A KR 20150039069 A KR20150039069 A KR 20150039069A
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South Korea
Prior art keywords
satellite
channel
coverage
interference information
network
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KR20140015585A
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Korean (ko)
Inventor
오대섭
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한국전자통신연구원
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Priority to US14/493,798 priority Critical patent/US20150094056A1/en
Publication of KR20150039069A publication Critical patent/KR20150039069A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18513—Transmission in a satellite or space-based system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/18578—Satellite systems for providing broadband data service to individual earth stations
    • H04B7/1858—Arrangements for data transmission on the physical system, i.e. for data bit transmission between network components
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/18578—Satellite systems for providing broadband data service to individual earth stations
    • H04B7/18584—Arrangements for data networking, i.e. for data packet routing, for congestion control

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computing Systems (AREA)
  • Radio Relay Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Disclosed is a satellite communication system and method for an adaptive frequency assignment. A satellite communication apparatus of the satellite communication system comprises: a beam generator for generating a satellite beam to be outputted to a coverage; an channel assignment part for assigning channels for the satellite beam based on interference information of the coverage; and a communication link formation part for forming a communication link with an earth station disposed in the coverage based on the assigned channels.

Description

TECHNICAL FIELD [0001] The present invention relates to a satellite communication system and method for adaptive channel allocation,

The present invention relates to a satellite communication system and method for adaptive channel allocation, and more particularly, to a satellite communication system and method for determining a channel to be allocated to a satellite beam in consideration of the radio wave interference state of coverage of a satellite network in a satellite communication system .

A satellite communication system using multiple beams can be composed of a plurality of satellite network coverage where each satellite beam is output. In addition, the satellite communication system can use different frequency bands for each beam and reuse frequency bands for different beams in order to increase the frequency efficiency.

In the present frequency distribution, the same frequency band is often shared between the satellite network and the ground network. Therefore, there may exist a ground network in which a channel of the same frequency band as the satellite beam is allocated in the satellite network coverage. In this case, radio interference may occur between the satellite beam and the radio signal of the terrestrial network.

Conventional satellite communication systems arbitrarily allocate channels of available frequency bands to satellite beams. Therefore, there is a possibility that the channel assigned to the satellite beam by the conventional satellite communication system and the channel of the frequency band used in the terrestrial network are the same. When the channel assigned to the satellite beam and the channel used for the terrestrial network are the same, there is a possibility that the satellite service may be obstructed by the radio wave interference of the terrestrial network.

Therefore, a method for avoiding interference between the terrestrial network and the satellite network is being demanded.

The present invention can provide an apparatus and method for avoiding interference between a satellite beam and a wireless signal used by another wireless system located within the coverage of a satellite network.

A satellite communication apparatus according to an embodiment of the present invention includes a beam generator for generating a satellite beam to be output as a coverage of a satellite network; A channel allocation unit for allocating a channel for the satellite beam based on frequency use and interference information of a coverage of a satellite network; And a communication link forming unit forming a communication link with an earth station located in the coverage of the satellite network based on the allocated channel.

The channel allocation unit of the satellite communication apparatus according to an embodiment of the present invention may allocate a satellite beam to a channel different from a channel used for wireless communication in the coverage of the satellite network.

The channel allocation unit of the satellite communication apparatus according to an exemplary embodiment of the present invention may select a channel that minimizes radio interference with the terrestrial radio network in the coverage of the satellite network and allocate the selected channel to the satellite beam.

The satellite communication apparatus according to an embodiment of the present invention further includes a monitoring unit for monitoring frequency use and interference information in the coverage, The channel can be reassigned.

A satellite control apparatus according to an embodiment of the present invention includes a channel allocation unit for allocating a channel for a satellite beam to be output as a coverage of a satellite network based on frequency use and interference information of a coverage of a satellite network; And a satellite communication device control unit for controlling the satellite communication device to output a satellite beam to the allocated channel to form a communication link between the earth station of coverage of the satellite network and the satellite communication device.

An earth station according to an embodiment of the present invention includes an interference information generating unit for generating interference information by measuring interference between a channel used for wireless communication and a channel assigned to a satellite beam in a coverage of a satellite network; An interference information transmission unit for transmitting interference information to the satellite communication device; And a communication link forming unit for receiving a satellite beam assigned a channel based on the interference information from the satellite communication apparatus and forming a communication link with the satellite communication apparatus by the received satellite beam.

A satellite communication method according to an embodiment of the present invention includes: generating a satellite beam to be output as a coverage of a satellite network; Allocating a channel for the satellite beam based on frequency use and interference information of coverage of a satellite network; And forming a communication link with an earth station located in the coverage of the satellite network based on the assigned channel.

According to another aspect of the present invention, there is provided a satellite control method comprising: allocating a channel for a satellite beam to be output as a coverage of a satellite network based on frequency use and interference information of a coverage of a satellite network; And controlling the satellite communication device to output a satellite beam on the assigned channel to form a communication link between the earth station of coverage of the satellite network and the satellite communication device.

The method of operating an earth station according to an embodiment of the present invention includes: generating interference information by measuring interference between a channel used for wireless communication and a channel allocated to a satellite beam in a coverage of a satellite network; Transmitting interference information to a satellite communication device; And receiving a satellite beam assigned a channel based on the interference information from the satellite communication device and forming a communication link with the satellite communication device with the received satellite beam.

According to an embodiment of the present invention, a channel to be allocated to a satellite beam is determined by using interference information of a coverage of a satellite network in which a satellite beam is output, so that interference between a satellite beam and a wireless signal used by another wireless system located within the coverage of the satellite network Can be avoided.

1 is a diagram illustrating a satellite communication system according to an embodiment of the present invention.
2 is an example of a conventional satellite communication system.
3 is an example of an interference phenomenon occurring in a conventional satellite communication system.
4 is a diagram illustrating a satellite communication apparatus according to an embodiment of the present invention.
5 is a diagram illustrating an earth station according to an embodiment of the present invention.
6 is a diagram illustrating a satellite control apparatus according to an embodiment of the present invention.
7 is an example of a satellite communication system according to an embodiment of the present invention.
8 is a flowchart illustrating a satellite communication method according to an embodiment of the present invention.
9 is a diagram illustrating an operation between configurations of a satellite communication system according to an embodiment of the present invention.
10 is a diagram illustrating an operation between configurations of a satellite communication system according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. A satellite communication method according to an embodiment of the present invention can be performed by a satellite communication system.

1 is a diagram illustrating a satellite communication system according to an embodiment of the present invention.

1, a satellite communication system according to an embodiment of the present invention may include a satellite communication device 110, an earth station 120, and a satellite control device 130.

The satellite communication device 110 may be a wireless device located outside the earth's atmosphere and performing satellite communications with the earth station 120 located on the earth's surface. For example, a satellite communication device 110 is a satellite network with a satellite or space station in the space shuttle (space It may be a station). At this time, the satellite communication apparatus 110 may generate a multi-satellite beam and output the generated satellite beams to the coverage of another satellite network, thereby forming a communication link with the earth station 120 located in the coverage of the satellite network. The satellite communication device 110 can transmit and receive voice and information to and from the earth station 120 through the formed communication link.

At this time, the satellite communication apparatus 110 can allocate a channel for the satellite beam based on the interference information of the coverage of the satellite network received from the earth station 120. At this time, the interference information may be information determined based on the channel used for wireless communication in the coverage of the satellite network in which the earth station 120 is located. Specifically, the satellite communication device 110 recognizes the radio interference generated in the coverage of the satellite network in which the earth station 120 is located based on the frequency use and interference information in the coverage received from the earth station 120, and the earth station 120 A channel for the satellite beam can be allocated so as to minimize the interference caused by the coverage of the satellite network located.

In addition, when the satellite control device 130 allocates a channel for the satellite beam based on the interference information, the satellite communication device 110 transmits the satellite signal to the frequency channel allocated to the satellite beam in accordance with the remote control of the satellite control device 130 And may form a communication link between the earth station 120 and the satellite communication device 110.

Detailed configuration and operation of the satellite communication apparatus 110 will be described in detail with reference to FIG.

The earth station 120 may be a wireless device located on the earth's surface and performing satellite communications with the satellite communications device 110. For example, the earth station 120 may include a fixed earth station that is installed in a specific location and does not move, and a mobile earth station that is movable.

At this time, the earth station 120 can establish a communication link with the other earth station through the satellite communication device 110. [ Specifically, the satellite communication device 110 connects a communication link between the earth station 120 and the satellite communication device 110 to a communication link between the other earth station and the satellite communication device 110 to establish a communication link between the earth station 120 and another earth station. Can be formed. At this time, the earth station 120 can transmit and receive voice and information to and from other earth stations using a communication link between the earth station 120 and another earth station.

In addition, the earth station 120 may form a communication link with the satellite control device 130 via the satellite communication device 110. At this time, the satellite control device 130 can connect to another communication network using a switching system. That is, the earth station 120 may form a communication link with a terminal or a base station in another communication network through the switching system of the satellite control device 130 forming the communication link. The earth station 120 can transmit and receive voice and information to and from other communication network terminals or base stations using the established communication link.

Then, the earth station 120 can generate interference information based on the coverage of the satellite network in which the earth station 120 is located. Specifically, the earth station 120 can measure the interference between the channel used by the satellite network of the satellite communication system and the other wireless network in the wireless communication and the channel allocated by the satellite communication apparatus 110 to the satellite beam in the coverage of the satellite network in which it is located have. The earth station 120 may generate the frequency use status and interference information in the satellite beam based on the measurement result and transmit the generated frequency use status and interference information to the satellite communication device 110 or the satellite control device 130. For example, when a channel used by a terrestrial network, such as a cellular system or a fixed microwave radio station, for wireless communication overlaps a channel assigned to a satellite beam by the satellite communication device 110, interference may occur between the terrestrial network and the satellite network of the satellite communication system Lt; / RTI > At this time, the earth station 120 can generate the interference information by measuring the frequency utilization information of the terrestrial network and the interference with the satellite network.

The detailed configuration and operation of the earth station 120 will be described in detail with reference to Fig.

The satellite control device 130 may remotely control the satellite communication device 110. [ Specifically, the satellite control device 130 can allocate a channel to a satellite beam to be output as the coverage of the satellite network based on the interference information. The satellite control device 130 controls the satellite communication device 110 to output the satellite beam to the assigned channel so as to establish a communication link between the earth station 120 and the satellite communication device 110 located in the coverage of the satellite network .

In addition, the satellite control device 130 may establish a communication link with the earth station 120 through the satellite communication device 110. Specifically, the satellite communication device 110 connects a communication link between the satellite control device 130 and the satellite communication device 110 to a communication link between the earth station 120 and the satellite communication device 110, And a communication link between the base station 120 and the earth station 120.

The satellite control device 130 includes a switching system, and can use a switching system to connect other communication networks such as a satellite network and a public switched telephone network (PSTN) network. For example, the satellite control device 130 may be a gateway earth station.

The detailed configuration and operation of the satellite control device 130 will be described in detail with reference to FIG.

2 is an example of a conventional satellite communication system.

The satellite network system 210 of the satellite communication system located outside the Earth's atmosphere can generate and output multiple satellite beams corresponding to each of the coverage 220 of the satellite network. For example, satellite network 210 may output satellite beam B1 to satellite network coverage 221 and output satellite beam B2 to coverage network 222 of the satellite network. When the entire frequency band used by the satellite network space station 210 is F and the frequency reuse factor is 7, the satellite network space station 210 can allocate and output the frequency channels f1 to f7 to the satellite beams B1 to B7, respectively.

That is, the satellite network space station 210 can allocate different channels of the frequency bands to the satellite beams B1 to B7, thereby increasing the frequency utilization efficiency through a frequency reuse technique or the like. In addition, the earth station of the satellite communication system may receive the satellite beam output to the coverage of the satellite network in which it is located and form a communication link with the satellite network 210. At this time, the earth station can be classified into the mobile earth station 231 or the fixed earth station 232 depending on the type of the satellite communication service. And, the user can use voice and information communication through the earth station. Specifically, the earth station can establish a communication link with another earth station through the satellite network 210 and transmit and receive voice and information to and from other earth stations.

The earth station may form a communication link with the gateway earth station 240 through the satellite network 210. The gateway earth station 240 is an earth station having a switching system, and can be connected to a satellite network and other communication networks. In addition, the gateway earth station 240 can control the operation of the satellite network 210 and the earth station, and can operate the billing system.

3 is an example of an interference phenomenon occurring in a conventional satellite communication system.

Since the service area of the satellite communication system is wider than that of the terrestrial network, at least one other wireless communication system can be operated within the coverage of the satellite network serving the satellite network. For example, there is a first base station 301 performing wireless communication with the second base station 302 using the channel f1 in the coverage 300 of the satellite network in which the satellite beam B1 310 allocated with the channel f1 is output .

At this time, the satellite beam 310 received by the ground station 303 can receive the interference 321 by the radio signal 320 of the channel f1 output from the first base station 301. [ The radio signal 320 of the channel f1 received by the second base station 330 may also receive the interference 311 by the satellite beam B1 310 to which the channel f1 is assigned. However, since the conventional satellite communication system fixes a channel to be allocated to a satellite beam, one satellite beam uses one channel regardless of interference. Therefore, when the channel allocated to the satellite beam and the channel used in the wireless communication of the coverage of the satellite network are overlapped, there is a possibility that the wireless communication and the satellite communication are interfered with each other and a failure occurs.

4 is a diagram illustrating a satellite communication apparatus according to an embodiment of the present invention.

4, a satellite communication apparatus 110 according to an embodiment of the present invention includes a beam generating unit 410, a channel allocating unit 420, a communication link forming unit 430, and a monitoring unit 440 can do.

The beam generating unit 410 may generate a satellite beam to be output to the coverage of the satellite network providing the satellite communication service. At this time, the beam generating unit 410 may generate multiple satellite beams corresponding to each of the coverage of the plurality of satellite networks.

The channel allocator 420 may allocate a channel for the satellite beam generated by the beam generator 410 based on the interference information of the coverage of the satellite network received from the earth station 120. [ At this time, the channel allocation unit 420 may select a channel that minimizes interference with the coverage of the satellite network using the optimal allocation algorithm, and allocate the selected channel as a channel for the satellite beam. Specifically, the channel allocator 420 recognizes a channel used for wireless communication in the coverage of the satellite network based on the interference information, allocates a channel different from the channel used for the wireless communication to the satellite beam in the coverage of the satellite network, The channel used for the wireless communication and the channel used for the satellite beam can be prevented from interfering with each other. For example, the channel allocation unit 420 may analyze the interference information and recognize that the channel used by another wireless network for wireless communication in the coverage of the satellite network is the f2 channel. The channel allocation unit 420 may allocate channels other than the f2 channel as frequency channels for satellite beams. When the channel for the satellite beam and the channel used for the wireless communication are different from each other, interference between the channel for the satellite beam and the channel used for the wireless communication by the other wireless network may not occur. That is, the channel allocation unit 420 can avoid the interference between the other wireless network and the satellite network by allocating the channel for the satellite beam among the remaining channels excluding the channel used by the other wireless network in the frequency band.

Further, interference may occur in the coverage of the satellite network in which a plurality of satellite beams are output respectively. Also, different wireless networks may use different channels in one satellite network coverage. At this time, the channel allocating unit 420 allocates channels to each satellite beam so as to minimize the interference of the satellite beams generated by the beam generating unit 410 based on the interference information received from the earth stations located in the coverage of each satellite network, . ≪ / RTI >

The communication link forming unit 430 may establish a communication link with an earth station 120 located within the coverage of the satellite network based on the channel assigned by the channel allocating unit 420. [ In detail, the communication link forming unit 430 may output the satellite beam generated by the beam generating unit 410 to the coverage of the satellite network using the channel allocated by the channel allocating unit 420. The earth station 120 located in the coverage of the satellite network can receive the satellite beam and form a communication link between the satellite communication device 110 and the earth station 120 via the satellite beam.

The monitoring unit 440 may monitor the interference information received by the channel allocating unit 420. Specifically, the monitoring unit 440 can monitor whether the interference information currently received by the channel allocation unit 420 is different from the previously received interference information. If the currently received interference information is different from the previously received interference information, the channel allocation unit 420 may update the interference information with the currently received information. The channel allocation unit 420 may reallocate the channel for the satellite beam based on the updated interference information. In addition, the monitoring unit 440 may update the existing interference information using the interference information received at predetermined time intervals.

Specifically, the channel allocator 420 may allocate a default channel as a channel for the satellite beam when the satellite communication device 110 is initially driven. Then, the communication link forming unit 430 can output the satellite beam to the coverage of the satellite network using the default channel.

Next, the channel assigning unit 420 can receive the interference information by the satellite beam output from the earth station 120 of the coverage of the satellite network on the default channel.

Next, the channel allocator 420 can change the channel to be allocated to the satellite beam based on the received interference information. At this time, the communication link forming unit 430 may output the satellite beam to the coverage of the satellite network using the changed channel.

The satellite communication apparatus 110 repeatedly allocates and reassigns the channel to the satellite beam by repeating the above process so as to minimize the interference between the channel allocated to the satellite beam and the channel used by the other wireless network in the coverage of the satellite network for wireless communication can do.

In addition, when the satellite communication apparatus 110 uses on-board processing technology, the satellite communication apparatus 110 may include a channel allocation unit 420 to allocate a channel to a satellite beam. The satellite communication device 110 may also form a communication link with an earth station 120 located within the coverage of the satellite network under the control of the satellite control device 130. Specifically, the satellite communication device 110 can receive the channel for the satellite beam from the satellite control device 130. [ The satellite communication apparatus 110 can output the satellite beam generated by the beam generator 410 to the coverage of the satellite network using the received channel. In this case, the operation of the channel allocating unit 420 and the monitoring unit 440 is performed by the satellite control device 130, so that the satellite communication device 110 does not include the channel allocation unit 320 and the monitoring unit 440 It is possible.

5 is a diagram illustrating an earth station according to an embodiment of the present invention.

5, the earth station 120 according to an exemplary embodiment of the present invention may include an interference information generating unit 510, an interference information transmitting unit 520, and a communication link forming unit 530.

The interference information generating unit 510 may generate interference information by measuring interference between the channel used for the wireless communication and the channel allocated to the satellite beam in the coverage of the satellite network. At this time, the interference information generating unit 510 may collect channels used for wireless communication in the coverage of the satellite network, and measure interference between the collected channels and the channels allocated to the satellite beams. The interference information generating unit 510 can generate interference information including the collected channel and interference measurement result.

The interference information transmitting unit 520 may transmit the interference information generated by the interference information generating unit 510 to the satellite communication device 110. [ At this time, the satellite communication apparatus 110 transmits the interference information received from the interference information transmission unit 520 to the satellite control apparatus 130, and transmits a channel to be allocated to the satellite beam based on the interference information from the satellite control apparatus 130 And can output the satellite beam to which the received channel is allocated.

The interference information transmitting unit 520 may transmit the interference information generated by the interference information generating unit 510 to the satellite control device 130 through the satellite communication device 110. [ At this time, the satellite control device 130 may determine a channel to be allocated to the satellite beam based on the interference information and transmit the channel to the satellite communication device 110. Then, the satellite communication apparatus 110 can output the satellite beam to which the received channel is allocated.

The communication link forming unit 530 can receive a satellite beam assigned a channel based on the interference information from the satellite communication apparatus 110 and form a communication link with the satellite communication apparatus 110 with the received satellite beam.

6 is a diagram illustrating a satellite control apparatus according to an embodiment of the present invention.

6, a satellite control device 130 according to an embodiment of the present invention may include a channel allocation unit 610, a satellite communication device control unit 620, and a monitoring unit 630.

The channel allocation unit 610 may allocate a channel to a satellite beam to be output to the coverage of the satellite network based on the interference information of coverage of the satellite network. At this time, the channel allocation unit 610 may allocate the satellite beam to a channel different from the channel used for the wireless communication in the coverage of the satellite network.

The satellite communication device control unit 620 may control the satellite communication device 110 to output the satellite beam using the channel allocated by the channel allocation unit 610. [ At this time, the satellite communication apparatus 110 may output a satellite beam under the control of the satellite communication apparatus control unit 620 to form a communication link between the earth station of coverage of the satellite network and the satellite communication apparatus.

The monitoring unit 630 may monitor the interference information received by the channel assigning unit 610. [ Specifically, the monitoring unit 630 can monitor whether the interference information currently received by the channel assigning unit 610 is different from the previously received interference information. If the currently received interference information is different from the previously received interference information, the channel allocation unit 610 can update the interference information with the currently received information. The channel allocation unit 610 may reallocate the channel for the satellite beam based on the updated interference information.

7 is an example of a satellite communication system according to an embodiment of the present invention.

There may be a communication system T1 712 that performs wireless communication of the terrestrial network using the channel f1 in the coverage 711 of the satellite network in which the satellite beam B1 710 is output. Then, the satellite network space station 210 can allocate and output the channel f1 to the satellite beam B1 710 as a default channel. At this time, interference may occur between the satellite beam B1 710 and the radio signal used by the communication system T1 712 for wireless communication.

Next, the earth station located in the coverage area 711 measures the interference between the satellite beam B1 710 and the radio signal used by the communication system T1 712 for wireless communication, generates interference information based on the measurement result, 210).

The satellite network 210 may then perform a channel allocation algorithm that minimizes interference within the coverage of the satellite network based on the received interference information. The satellite network 210 may then assign a frequency channel to each satellite beam that minimizes interference within the coverage of each satellite network.

For example, satellite network 210 may reallocate channel f3 to satellite beam B1 710 to avoid interference between radio signals used by communication system T1 712 for wireless communications. In addition, there may be communication system T2 712 that performs wireless communication using channel f3 in coverage 722 where satellite beam B3 720 is output. At this time, since the channel f3 is allocated to the satellite channel B3 720 as a default channel as shown in Fig. 2, interference may occur between the satellite beam B3 720 and the radio signal used by the communication system T2 722 for wireless communication have. Thus, the satellite network space station 210 may reallocate channel f6 to satellite beam B3 720 to avoid interference between the radio signals used by the communication system T2 722 for wireless communication. And, the satellite beam B6 (740) to which the channel f6 has been allocated as the default channel has been reassigned to the satellite beam B3 (720), which was assigned to the default channel, so that no channel is allocated. Thus, satellite network space station 210 may reallocate satellite beam B1 710 to satellite beam B6 740, and channel f1 that was not reallocated to satellite beam B2 720. At this time, there is no other communication system using the channel f1 in the coverage 741 where the satellite beam B6 (740) is to be output, so that interference does not occur. In addition, satellite beam B2 730 may not have another communication system that uses channel f2 in coverage 731 to be output as shown in Fig. At this time, the satellite network space station 210 may not change the channel assigned to the satellite beam B2 (730).

That is, the satellite network space station 210 reassigns the channels to the respective satellite beams in consideration of the channels assigned to the respective satellite beams and the channels used by the other wireless systems in the coverage in which the respective satellite beams are output, It is possible to avoid the interference between the channel assigned to the radio system and the channel of the radio signal used by the other radio system.

8 is a flowchart illustrating a channel allocation method according to an embodiment of the present invention.

In step 810, the beam generator 410 may generate a satellite beam to be output to the coverage of the satellite network providing the satellite communication service. At this time, the beam generating unit 410 may generate multiple satellite beams corresponding to each of the coverage of the plurality of satellite networks.

In step 820, the channel allocation unit 420 may allocate a channel for the satellite beam generated in step 810 based on the interference information of coverage of the satellite network received from the earth station 120. At this time, the channel allocation unit 420 may select a channel that minimizes interference with the coverage of the satellite network using the optimal allocation algorithm, and allocate the selected channel as a channel for the satellite beam.

In step 830, the communication link forming unit 430 may establish a communication link with an earth station 120 located within the coverage of the satellite network based on the channel allocated in step 820. [ In detail, the communication link forming unit 430 may output the satellite beam generated by the beam generating unit 410 to the coverage of the satellite network using the channel allocated by the channel allocating unit 420. The earth station 120 located in the coverage of the satellite network can receive the satellite beam and form a communication link between the satellite communication device 110 and the earth station 120 via the satellite beam.

In step 840, the monitoring unit 440 may monitor whether the interference information currently received by the channel allocation unit 420 is compared with the previously received interference information.

If the interference information currently received by the channel allocation unit 420 changes, the monitoring unit 440 controls the channel allocation unit 420 to update the interference information with the currently received information, and performs step 850 . In addition, if the interference information currently received by the channel allocation unit 420 does not change, the monitoring unit 440 may terminate the operation.

In step 850, the channel allocation unit 420 may reallocate the channel for the satellite beam based on the updated interference information in step 840.

9 is a diagram illustrating an operation between configurations of a satellite communication system according to an embodiment of the present invention.

9 is an example of operation of a satellite communication system in which the satellite communication device 110 allocates a channel to a satellite beam.

In step 910, the beam generator 410 of the satellite communication device 110 may generate a satellite beam to be output to the coverage of the satellite network providing the satellite communication service. The channel allocation unit 420 of the satellite communication device 110 may allocate a predetermined default channel as a channel for the generated satellite beam.

The communication link forming unit 430 of the satellite communication device 110 in step 920 may output the satellite beam to the coverage of the satellite network using the default channel allocated in step 920. [

In step 930, the interference information generator 510 of the earth station 120 measures the interference between the satellite beam output in step 920 and the channel used for wireless communication in the coverage where it is located, Thereby generating interference information. At this time, the interference information generating unit 510 may collect channels used for wireless communication in the coverage of the satellite network, and measure interference between the collected channels and the channels allocated to the satellite beams. The interference information generating unit 510 can generate interference information including the collected channel and interference measurement result.

In step 940, the interference information transmitter 520 of the earth station 120 may transmit the interference information generated in step 930 to the satellite communication device 110.

In step 950, the channel allocation unit 420 of the satellite communication device 110 may allocate a channel for the satellite beam based on the interference information received in step 940. Specifically, the channel allocator 420 may select a channel that minimizes interference with the coverage of the satellite network based on the received interference information, and may re-allocate the selected channel as a channel for the satellite beam.

The communication link forming unit 430 of the satellite communication device 110 forms a communication link with the earth station 120 located within the coverage of the satellite network based on the channel allocated in step 950 in step 960 can do. In detail, the communication link forming unit 430 may assign the satellite beam to the channel selected in step 950 and output it to the coverage of the satellite network.

The communication link forming unit 430 of the earth station 120 may perform the satellite communication between the satellite communication device 110 and the earth station 120 through the satellite beam received in step 960 in step 970.

10 is a diagram illustrating an operation between configurations of a satellite communication system according to another embodiment of the present invention.

10 is an operation example of a satellite communication system in which a satellite control device 130 allocates a channel to a satellite beam and performs satellite communication by remotely controlling the satellite communication device 110. [

In step 1010, the beam generator 410 of the satellite communication device 110 may generate a satellite beam to be output to the coverage of the satellite network providing the satellite communication service. The channel allocation unit 420 of the satellite communication device 110 may allocate a predetermined default channel as a channel for the generated satellite beam.

In step 1020, the communication link forming unit 430 of the satellite communication device 110 may output the satellite beam to the coverage of the satellite network using the default channel allocated in step 1020.

In step 1030, the interference information generator 510 of the earth station 120 measures the interference between the satellite beam output in step 1020 and the channel used for wireless communication in the coverage where it is located, Thereby generating interference information. At this time, the interference information generating unit 510 may collect channels used for wireless communication in the coverage of the satellite network, and measure interference between the collected channels and the channels allocated to the satellite beams. The interference information generating unit 510 can generate interference information including the collected channel and interference measurement result.

In step 1040, the interference information transmitter 520 of the earth station 120 may transmit the interference information generated in step 1030 to the satellite communication device 110. At this time, the satellite communication device 110 can transmit the interference information received from the interference information transmission unit 520 to the satellite control device 130. [

In step 1050, the channel assigning unit 610 of the satellite control device 130 may allocate a channel for the satellite beam based on the interference information received in step 1040. Specifically, the channel allocation unit 610 may select a channel that minimizes interference with the coverage of the satellite network based on the received interference information, and may re-allocate the selected channel as a channel for the satellite beam.

In step 1060, the satellite communication device controller 620 of the satellite control device 130 may transmit a control signal to the satellite communication device 110. In this case, the control signal may be a signal for remotely controlling the satellite communication apparatus 110 to allocate and output a channel for the satellite beam determined in step 1050 to each satellite beam.

The communication link forming unit 430 of the satellite communication device 110 forms a communication link with the earth station 120 located in the coverage of the satellite network in accordance with the control signal received in step 1060 can do. Specifically, the communication link forming unit 430 allocates the channel selected in step 1050 to the satellite beam according to the control signal received in step 1060, and outputs the satellite beam allocated to the channel to the coverage of the satellite network have.

The communication link forming unit 430 of the earth station 120 may perform the satellite communication between the satellite communication apparatus 110 and the earth station 120 via the satellite beam received in step 1070 in step 1080.

The present invention can avoid the interference between the satellite beam and the radio signals used by other radio systems located in the coverage of the satellite network by using the interference information of the coverage of the satellite network in which the satellite beam is output.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

110: Satellite communication device
120: earth station
130: satellite control device

Claims (20)

A beam generator for generating a satellite beam to be output as a coverage of a satellite network;
A channel allocation unit for allocating a channel for the satellite beam based on interference information of coverage of a satellite network; And
And a communication link forming unit forming a communication link with an earth station located in the coverage of the satellite network based on the allocated channel,
≪ / RTI > The method according to claim 1,
The earth station,
A satellite communication apparatus for generating interference information by measuring interference between a channel used for wireless communication and a channel allocated to a satellite beam in a coverage of a satellite network, and transmitting the generated interference information to the channel allocation unit. 3. The method of claim 2,
The channel assigning unit,
A satellite communication apparatus for allocating a channel different from a channel used for wireless communication to a satellite beam in a coverage of a satellite network. The method according to claim 1,
The channel assigning unit,
A satellite communication apparatus for selecting a channel capable of minimizing interference with a coverage of a satellite network and assigning the selected channel to a satellite beam. The method according to claim 1,
A monitoring unit for monitoring interference information
Further comprising:
The channel assigning unit,
And reassigning the channel for the satellite beam based on the change in the monitored interference information. A channel allocation unit for allocating a channel for a satellite beam to be output to a coverage of a satellite network based on interference information of coverage of the satellite network; And
And a satellite communication device control unit for controlling the satellite communication device to output a satellite beam to the allocated channel to form a communication link between the earth station of the coverage of the satellite network and the satellite communication device,
≪ / RTI > The method according to claim 6,
The earth station,
A satellite control apparatus for generating interference information by measuring interference between a channel used for wireless communication and a channel allocated to a satellite beam in a coverage of a satellite network, and transmitting the generated interference information to the channel allocation unit. The method according to claim 6,
The channel assigning unit,
A satellite control apparatus for allocating a channel used for wireless communication and another channel to a satellite beam in a coverage of a satellite network. The method according to claim 6,
A monitoring unit for monitoring interference information
Further comprising:
The channel assigning unit,
And reassigning the channel for the satellite beam based on the change in the monitored interference information. An interference information generating unit for generating interference information by measuring interference between a channel used for wireless communication and a channel assigned to a satellite beam in a coverage of a satellite network;
An interference information transmission unit for transmitting interference information to the satellite communication device; And
A communication link forming unit for receiving a satellite beam assigned a channel based on the interference information from the satellite communication apparatus and forming a communication link with the satellite communication apparatus by the received satellite beam,
. 11. The method of claim 10,
The satellite communication apparatus includes:
And selects a channel capable of minimizing interference with the coverage of the satellite network based on the received interference information, and allocates the selected channel to the satellite beam. 11. The method of claim 10,
The satellite communication device comprises:
Receives the received interference information to the satellite control device, receives the channel to be allocated to the satellite beam based on the interference information from the satellite control device, and outputs the satellite beam to which the received channel is allocated. Generating a satellite beam to be output as a coverage of a satellite network;
Allocating a channel for the satellite beam based on interference information of coverage of a satellite network; And
Establishing a communication link with an earth station located in the coverage of the satellite network based on the assigned channel
/ RTI > 14. The method of claim 13,
The interference information
Wherein the earth station measures and generates interference between a channel used for wireless communication and a channel assigned to a satellite beam in a coverage of a satellite network. 14. The method of claim 13,
Wherein the assigning of the channel comprises:
A satellite communication method in which a channel capable of minimizing interference with a coverage of a satellite network is selected and allocated to a satellite beam. 14. The method of claim 13,
Monitoring interference information; And
And reassigning the channel for the satellite beam based on the change in the monitored interference information
Further comprising the steps of: Allocating a channel for a satellite beam to be output to a coverage of a satellite network based on interference information of coverage of the satellite network; And
Controlling the satellite communication device to output a satellite beam at the allocated channel to form a communication link between the earth station of coverage of the satellite network and the satellite communication device
/ RTI > 18. The method of claim 17,
Monitoring interference information; And
And reassigning the channel for the satellite beam based on the change in the monitored interference information
Lt; / RTI > Generating interference information by measuring interference between a channel used for wireless communication and a channel allocated to a satellite beam in a coverage of a satellite network;
Transmitting interference information to a satellite communication device; And
Receiving a satellite beam assigned a channel based on the interference information from the satellite communication device, and forming a communication link with the satellite communication device with the received satellite beam
Gt; a < / RTI > earth station. 20. The method of claim 19,
The satellite communication device comprises:
Receiving the received interference information to the satellite control device, receiving a channel to be allocated to the satellite beam based on the interference information from the satellite control device, and outputting the satellite beam to which the received channel is allocated.
KR20140015585A 2013-10-01 2014-02-11 Satellite communication system and method for adaptive frequency assignment KR20150039069A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102124166B1 (en) 2019-11-26 2020-06-17 광운대학교 산학협력단 Satellite Image Based Channel Estimation and Adaptive Modulation System

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102124166B1 (en) 2019-11-26 2020-06-17 광운대학교 산학협력단 Satellite Image Based Channel Estimation and Adaptive Modulation System

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