KR101325291B1 - Apparatus and Method for Sharing Frequency - Google Patents

Apparatus and Method for Sharing Frequency Download PDF

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KR101325291B1
KR101325291B1 KR1020100014128A KR20100014128A KR101325291B1 KR 101325291 B1 KR101325291 B1 KR 101325291B1 KR 1020100014128 A KR1020100014128 A KR 1020100014128A KR 20100014128 A KR20100014128 A KR 20100014128A KR 101325291 B1 KR101325291 B1 KR 101325291B1
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South Korea
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radio communication
cognitive radio
area
interference
communication device
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KR1020100014128A
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Korean (ko)
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KR20110068743A (en
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강현덕
홍헌진
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한국전자통신연구원
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Priority claimed from US12/938,611 external-priority patent/US8718693B2/en
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Abstract

A frequency sharing apparatus and method are disclosed. According to embodiments of the present invention, by selecting a cognitive radio communication device having a minimum interference influence area among a plurality of cognitive radio communication devices and assigning an idle frequency to the selected cognitive radio communication device, the opportunity for the idle frequency of the secondary system It can improve the use efficiency.

Description

Frequency sharing apparatus and method {Apparatus and Method for Sharing Frequency}

The present invention relates to a frequency sharing apparatus and a method, and more particularly to a frequency sharing apparatus and method that can improve the opportunistic use efficiency for the idle frequency of the primary system of the cognitive radio communication device.

Cognitive radio technology uses the idle frequency that the secondary system does not use temporally / locally in the frequency system of the primary system so as to increase the frequency utilization efficiency for the frequency band already in use without interfering with the primary system. It is a spectrum overlay sharing technology.

The opportunistic use of the frequency band by such a cognitive radio technology can solve the problem of exhaustion of frequency resources, which is insufficient due to the emergence of new wireless communication services and the development of radio communication technology.

Therefore, in cognitive radio technology, it is important to develop a technology for improving the opportunistic use efficiency of idle frequencies.

In the present specification, a method for improving the opportunistic use efficiency for the idle frequency of the cognitive radio communication device is presented.

Embodiments of the present invention select the cognitive radio communication device having the least interference area among a plurality of cognitive radio communication devices and assign an idle frequency to the selected cognitive radio communication device, thereby improving the opportunistic use efficiency for the idle frequency of the secondary system. The goal is to provide a way to improve.

According to an aspect of the present invention, there is provided a frequency sharing apparatus comprising: a receiver configured to receive information on an interference influence region from a plurality of cognitive radio communication apparatuses when there are a plurality of cognitive radio communication apparatuses to use an idle frequency of a primary system; And a frequency allocator configured to select a cognitive radio communication device having a minimum size of the interference influence area based on the received information and to allocate the idle frequency to the selected cognitive radio communication device.

The frequency sharing method according to an aspect of the present invention, when there are a plurality of cognitive radio communication devices to use the idle frequency of the primary system, receiving information on the interference influence region from the plurality of cognitive radio communication devices, the Selecting a cognitive radio communication device having a minimum size of the interference affected area based on the received information and assigning the idle frequency to the selected cognitive radio communication device.

By selecting a cognitive radio communication device having a minimum interference influence area from among a plurality of cognitive radio communication devices and assigning an idle frequency to the selected cognitive radio communication device, it is possible to improve the opportunistic use efficiency for the idle frequency of the secondary system.

1 is a diagram conceptually illustrating a primary system and a secondary system according to an embodiment of the present invention.
2 is a view showing a secondary system according to an embodiment of the present invention.
3 is a diagram illustrating a configuration of a frequency sharing device according to an embodiment of the present invention.
4 is a flowchart illustrating a frequency sharing method according to an embodiment of the present invention.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to or limited by the embodiments. Like reference symbols in the drawings denote like elements.

1 is a diagram conceptually illustrating a primary system and a secondary system according to an embodiment of the present invention.

Referring to FIG. 1, the secondary system 110 includes a secondary base station 111 and a secondary terminal 112, and the primary system 120 includes a primary base station 121 and a primary. And a head terminal 122.

The secondary system 110 may recognize some or all of the frequency resources allocated to the primary system 120 as available frequency resources using cognitive radio technology. The secondary base station 111 and the secondary terminal 112 belonging to the secondary system 110 may transmit / receive data with each other using the recognized available frequency resources. Here, all communication devices belonging to the secondary system 110 such as the secondary base station 111 and the secondary terminal 112 will be referred to as "cognitive wireless communication devices".

In order for the cognitive radio communication device to use the idle frequency of the primary system 110, information exchange between the primary base station 121 and the primary terminal 122 is required.

Meanwhile, when the primary system 120 and the secondary system 110 use the same frequency resource, a collision may occur between the primary system 120 and the secondary system 110. However, primary system 120 has priority over frequency resources allocated to primary system 120 over secondary system 110.

Accordingly, the secondary system 110 may use some or all of the frequency resources allocated to the primary system 120 with the limitation that it does not interfere with the communication operation of the primary system 120. As a result, the secondary base station 111 and the secondary terminal 112 may sense a signal of the primary system 120 and perform data communication based on the sensing result. For example, when the signal of the primary system 120 does not exist, or the interference generated in the primary system 120 due to the data communication of the secondary base station 111 and the secondary terminal 112 is below a certain level, the secondary The base station 111 and the secondary terminal 112 may use some or all of the frequency resources allocated to the primary system 120.

2 is a view showing a secondary system according to an embodiment of the present invention.

Referring to FIG. 2, the secondary system 200 includes a secondary transmitter 210 and a secondary receiver 220. According to an embodiment, the secondary transmitter 210 may be a secondary base station of the secondary system 200. In addition, the secondary receiver 220 may be a secondary terminal of the secondary system 200. The cognitive radio communication device may be any communication device such as the secondary transmitter 210 and the secondary receiver 220 belonging to the secondary system 200.

The secondary transmitter 210 has a transmission range (TR) 211 and a carrier sensing range (CSR) 213.

The transmission area 211 may be an area in which the secondary transmitter 210 may transmit data to the secondary receiver 220 in the secondary system 200. According to an embodiment, the transmission area 211 may be in the form of a circle centering on the secondary transmitter 210. In this case, the maximum distance of the transmission region 211 may be represented by a transmission range of secondary transmitter (TRs) 212.

The carrier sensing area 213 may be an area where the secondary transmitter 210 senses a signal of the primary system. According to an embodiment, the secondary transmitter 210 may sense whether there is a third transmitter in the carrier sensing region 213. According to an embodiment, the carrier sensing region 213 may be in the form of a circle centered on the secondary transmitter 210. In this case, the maximum distance of the carrier sensing region 213 may be represented by a carrier sensing range of secondary transmitter (CSRs) 214.

The secondary receiver 220 has an interference region 221.

The interference area 221 may be an area for the secondary receiver 220 to perform data communication with the secondary transmitter 210 without being interfered with by other transmitters other than the secondary transmitter 210. For example, in order for the secondary receiver 220 to perform data communication with the secondary transmitter 210 without interference, there should be no third transmitter in the interference region 221. According to an embodiment, the interference region 221 may be in the form of a circle centering on the secondary receiver 220. In this case, the maximum distance of the interference region 221 may be represented by an interference range of secondary transmitters (IRs) 222.

Range of Interference (ROI) 230 according to an embodiment of the present invention is outside the carrier sensing region 213 of the secondary transmitter 210 of the interference region 221 of the secondary receiver 220. Area.

Meanwhile, since the interference affected area 230 is an area outside the carrier sensing area 213 of the secondary transmitter 210, a third transmitter other than the secondary transmitter 210 may exist inside the interference affected area 230. . In addition, since the interference affected area 230 is an area within the interference area 221 of the secondary receiver 220, when there is a third transmitter other than the secondary transmitter 210, the interference affected area 230 is not affected by the interference by the third transmitter. As a result, data communication between the secondary transmitter 210 and the secondary receiver 220 may fail. Therefore, the smaller the size of the interference influence area 230, the smaller the probability that data communication between the secondary transmitter 210 and the secondary receiver 220 is interfered by the third transmitter.

3 is a diagram illustrating a configuration of a frequency sharing device according to an embodiment of the present invention.

Referring to FIG. 3, the frequency sharing apparatus 300 according to an embodiment of the present invention includes a receiver 310 and a frequency allocator 320.

The frequency sharing apparatus 300 according to an embodiment may be inserted in the form of a module into a cognitive radio communication device of a secondary system to use an idle frequency of a primary system.

When there are a plurality of cognitive radio communication devices to use the idle frequency of the primary system, the receiver 310 receives information on an interference influence region from the plurality of cognitive radio communication devices. That is, the receiver 310 may receive information on the interference influence region of each of the plurality of cognitive radio communication devices from the plurality of cognitive radio communication devices.

According to an embodiment, the information on the interference influence region may be information about the size, location, etc. of the interference influence region.

The frequency allocator 320 may select at least one cognitive wireless communication device having a minimum size of the interference affected area based on the information on the interference affected areas received by the receiver 310 from the plurality of cognitive wireless communication devices. In addition, the frequency allocator 320 may allocate an idle frequency of the primary system to the selected at least one cognitive radio communication device.

According to an embodiment, there may be a plurality of cognitive radio communication devices having a minimum size of an interference influence area. In this case, the frequency allocator 320 may randomly select one cognitive radio communication device from among the plurality of cognitive radio communication devices having the smallest interference influence area and allocate an idle frequency.

According to one side of the present invention, the frequency sharing device 300 may further include a calculator 330.

The calculator 330 may calculate the size of the interference influence area of the cognitive radio communication device.

According to an exemplary embodiment, the receiver 310 may receive information on a carrier sensing area, information on a transmission area, and information on an interference area from a cognitive radio communication device. In addition, the calculator 330 may calculate the size of the interference influence area of the cognitive radio communication apparatus based on the information on the carrier sensing area, the information on the transmission area, and the information on the interference area received by the receiver 310. .

According to one aspect of the present invention, some of the plurality of cognitive radio communication devices to use the idle frequency of the primary system transmits information on the interference affected area to the frequency sharing device 300, and the other part of the carrier sensing area Information, information on a transmission area, and information on an interference area may be transmitted to the frequency sharing device 300.

When the receiver 310 of the frequency sharing apparatus 300 receives the information on the interference influence region from the cognitive radio communication apparatus, the receiver 310 may transmit the received information to the frequency allocator 320. In addition, when the receiver 310 receives information on the carrier sensing area, information on the transmission area, and information on the interference area from the cognitive radio communication device, the reception unit 310 may transmit the received information to the operation unit 330. According to an embodiment, the calculation unit 330 calculates and calculates the size of the interference influence area of the cognitive radio communication device based on the received information on the carrier sensing area, the information on the transmission area, and the information on the interference area. The result value may be transmitted to the frequency allocation unit 320.

When the maximum distance of the carrier sensing area and the maximum distance of the interference area of the cognitive radio communication apparatus are the same, the calculation unit 330 according to an embodiment of the present invention may calculate the size of the interference influence area by using Equation 1 below.

[Equation 1]

Figure 112010010290074-pat00001

only,

Figure 112010010290074-pat00002
Is the size of the interference affected area of the cognitive radio communication device,
Figure 112010010290074-pat00003
The maximum distance of the transmission area of the cognitive radio communication device,
Figure 112010010290074-pat00004
Is the maximum distance of the interference area of the cognitive radio communication device,
Figure 112010010290074-pat00005
Indicates. Also,
Figure 112010010290074-pat00006
Represents the maximum distance of the carrier sensing area of the cognitive radio communication device.

When the maximum distance of the carrier sensing area of the cognitive radio communication device is greater than the maximum distance of the interference area, the calculator 330 may calculate the size of the interference influence area differently according to the maximum distance of the transmission area of the cognitive radio communication device. .

According to an embodiment, the operation unit 330 classifies the maximum distance of the transmission area of the cognitive radio communication device into four cases of the first case, the second case, the third case, and the fourth case, and according to each case. The size of the interference influence region of the cognitive radio communication apparatus can be calculated differently.

The first case for the maximum distance of the transmission area

Figure 112010010290074-pat00007
In this case, the calculator 330 may calculate the size of the interference influence area of the cognitive radio communication device as 0.

The second case for the maximum distance of the transmission area

Figure 112010010290074-pat00008
In this case, the calculator 330 may calculate the size of the interference influence area of the cognitive radio communication device using Equation 2 below.

[Equation 2]

Figure 112010010290074-pat00009

only,

Figure 112010010290074-pat00010
Represents the size of the interference affected area of the cognitive radio communication device,
Figure 112010010290074-pat00011
,
Figure 112010010290074-pat00012
, And
Figure 112010010290074-pat00013
Indicates.

The third case for the maximum distance of the transmission area

Figure 112010010290074-pat00014
In this case, the calculator 330 may calculate the size of the interference influence area of the cognitive radio communication device using Equation 3 below.

[Equation 3]

Figure 112010010290074-pat00015

The fourth case for the maximum distance of the transmission area

Figure 112010010290074-pat00016
In this case, the calculator 330 may calculate the size of the interference influence area of the cognitive radio communication device using Equation 4 below.

[Equation 4]

Figure 112010010290074-pat00017

4 is a flowchart illustrating a frequency sharing method according to an embodiment of the present invention.

Referring to FIG. 4, the frequency sharing method according to an embodiment of the present invention may determine whether there are a plurality of cognitive radio communication devices to use the idle frequency of the primary system (S410).

If there is only one cognitive radio communication device to use the idle frequency of the primary system, the frequency sharing method may allocate an idle frequency to the one cognitive radio communication device.

When there are a plurality of cognitive radio communication devices to use the idle frequency of the primary system, the frequency sharing method may receive information on the interference influence region from the plurality of cognitive radio communication devices (S420).

According to an embodiment of the present invention, the frequency sharing method may receive information on a carrier sensing area, information on a transmission area, and information on an interference area from a plurality of cognitive radio communication devices (S421).

In addition, the frequency sharing method may calculate the size of the interference influence region of the cognitive radio communication apparatus based on the received information on the carrier sensing region, the information on the transmission region, and the information on the interference region (S422).

In the frequency sharing method according to an embodiment of the present invention, when the maximum distance of the carrier sensing region and the maximum distance of the interference region of the cognitive radio communication apparatus are the same, the size of the interference influence region may be calculated using Equation 5 below.

[Equation 5]

Figure 112010010290074-pat00018

only,

Figure 112010010290074-pat00019
Is the size of the interference affected area of the cognitive radio communication device,
Figure 112010010290074-pat00020
The maximum distance of the transmission area of the cognitive radio communication device,
Figure 112010010290074-pat00021
Is the maximum distance of the interference area of the cognitive radio communication device,
Figure 112010010290074-pat00022
Indicates. Also,
Figure 112010010290074-pat00023
Represents the maximum distance of the carrier sensing area of the cognitive radio communication device.

According to an embodiment of the present invention, in the frequency sharing method, when the maximum distance of the carrier sensing area of the cognitive radio communication device is greater than the maximum distance of the interference area, the size of the interference influence area differs according to the maximum distance of the transmission area of the cognitive radio communication device. Can be calculated.

According to an embodiment, the frequency sharing method classifies the maximum distance of the transmission area of the cognitive radio communication device into four cases of the first case, the second case, the third case, and the fourth case, and recognizes each case. The size of the interference influence area of the wireless communication device can be calculated differently.

The first case for the maximum distance of the transmission area

Figure 112010010290074-pat00024
In this case, the frequency sharing method may calculate the size of the interference influence area of the cognitive radio communication device as 0.

The second case for the maximum distance of the transmission area

Figure 112010010290074-pat00025
In the case of, the frequency sharing method may calculate the size of the interference influence region of the cognitive radio communication apparatus using Equation 6 below.

[Equation 6]

Figure 112010010290074-pat00026

only,

Figure 112010010290074-pat00027
Represents the size of the interference affected area of the cognitive radio communication device,
Figure 112010010290074-pat00028
,
Figure 112010010290074-pat00029
, And
Figure 112010010290074-pat00030
Indicates.

The third case for the maximum distance of the transmission area

Figure 112010010290074-pat00031
In the case of, the frequency sharing method may calculate the size of the interference influence region of the cognitive radio communication apparatus using Equation 7 below.

[Equation 7]

Figure 112010010290074-pat00032

The fourth case for the maximum distance of the transmission area

Figure 112010010290074-pat00033
In the case of, the frequency sharing method may calculate the size of the interference influence region of the cognitive radio communication apparatus using Equation 8 below.

[Equation 8]

Figure 112010010290074-pat00034

According to an embodiment of the present invention, the frequency sharing method may select a cognitive radio communication device having a minimum size of a received or calculated interference influence region (S430). When there are a plurality of cognitive radio communication devices having the smallest interference impact area, the frequency sharing method may arbitrarily select one of the cognitive radio communication devices having the smallest interference impact area.

In addition, the frequency sharing method may allocate an idle frequency to the selected cognitive radio communication device (S440).

Embodiments according to the present invention may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of the computer-readable recording medium include magnetic media such as a hard disk, a floppy disk, and a magnetic tape; optical media such as CD-ROM and DVD; magnetic recording media such as a floppy disk; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. 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: secondary system
111: secondary base station
112: secondary terminal
120: primary system
121: primary base station
122: primary terminal

Claims (10)

  1. When there are a plurality of cognitive radio communication devices to use the idle frequency of the primary system, the receiving unit for receiving information on the interference affected area from the plurality of cognitive radio communication devices; And
    A frequency allocator configured to select a cognitive radio communication device having a minimum size of the interference influence area based on the received information and to allocate the idle frequency to the selected cognitive radio communication device;
    Frequency sharing device comprising a.
  2. The method of claim 1,
    A calculator for calculating a size of the interference influence region
    Further comprising:
    The receiver may further comprise:
    Receiving information on a carrier sensing area, information on a transmission area, and information on an interference area from the plurality of cognitive radio communication devices,
    The operation unit,
    And a size of the interference influence region based on the information on the carrier sensing region, the information on the transmission region, and the information on the interference region.
  3. The method of claim 2, wherein the calculation unit,
    And calculating a size of the interference influence area by using Equation 1 below when the maximum distance of the carrier sensing area and the maximum distance of the interference area are the same.
    [Equation 1]
    Figure 112010010290074-pat00035

    only,
    Figure 112010010290074-pat00036
    : Size of interference influence region of cognitive radio communication device,
    Figure 112010010290074-pat00037
    : Maximum distance of a transmission area of a cognitive radio communication device,
    Figure 112010010290074-pat00038
    : Maximum distance of the interference zone of a cognitive radio communication device,
    Figure 112010010290074-pat00039
    , And
    Figure 112010010290074-pat00040
    : Maximum distance of carrier sensing area of cognitive radio communication device.
  4. The method of claim 2, wherein the calculation unit,
    And when the maximum distance of the carrier sensing area is greater than the maximum distance of the interference area, calculating the size of the interference influence area differently according to the maximum distance of the transmission area.
  5. 5. The apparatus according to claim 4,
    And calculating the size of the interference affected area as 0 when the maximum distance of the transmission area satisfies Equation 2 below.
    [Equation 2]
    Figure 112010010290074-pat00041

    only,
    Figure 112010010290074-pat00042
    : Maximum distance of a transmission area of a cognitive radio communication device,
    Figure 112010010290074-pat00043
    : Maximum distance of an interference area of a cognitive radio communication device, and
    Figure 112010010290074-pat00044
    : Maximum distance of carrier sensing area of cognitive radio communication device.
  6. 5. The apparatus according to claim 4,
    And the maximum distance of the transmission region satisfies Equation 3 below, and calculates the size of the interference influence region by using Equation 4 below.
    [Equation 3]
    Figure 112010010290074-pat00045

    only,
    Figure 112010010290074-pat00046
    : Maximum distance of a transmission area of a cognitive radio communication device,
    Figure 112010010290074-pat00047
    : Maximum distance of an interference area of a cognitive radio communication device, and
    Figure 112010010290074-pat00048
    : Maximum distance of carrier sensing area of cognitive radio communication device.
    [Equation 4]
    Figure 112010010290074-pat00049

    only,
    Figure 112010010290074-pat00050
    : Size of interference influence region of cognitive radio communication device,
    Figure 112010010290074-pat00051
    ,
    Figure 112010010290074-pat00052
    , And
    Figure 112010010290074-pat00053
  7. 5. The apparatus according to claim 4,
    And a maximum distance of the transmission area satisfies Equation 5 below, and calculates the size of the interference influence area by using Equation 6 below.
    [Equation 5]
    Figure 112010010290074-pat00054

    only,
    Figure 112010010290074-pat00055
    : Maximum distance of a transmission area of a cognitive radio communication device,
    Figure 112010010290074-pat00056
    : Maximum distance of an interference area of a cognitive radio communication device, and
    Figure 112010010290074-pat00057
    : Maximum distance of carrier sensing area of cognitive radio communication device.
    [Equation 6]
    Figure 112010010290074-pat00058

    only,
    Figure 112010010290074-pat00059
    : Size of interference influence region of cognitive radio communication device,
    Figure 112010010290074-pat00060
    ,
    Figure 112010010290074-pat00061
    , And
    Figure 112010010290074-pat00062
  8. 5. The apparatus according to claim 4,
    And a maximum distance of the transmission region satisfies Equation 7, and calculates the size of the interference influence region by using Equation 8.
    [Equation 7]
    Figure 112010010290074-pat00063

    only,
    Figure 112010010290074-pat00064
    : Maximum distance of a transmission area of a cognitive radio communication device,
    Figure 112010010290074-pat00065
    : Maximum distance of an interference area of a cognitive radio communication device, and
    Figure 112010010290074-pat00066
    : Maximum distance of carrier sensing area of cognitive radio communication device.
    [Equation 8]
    Figure 112010010290074-pat00067

    only,
    Figure 112010010290074-pat00068
    : Size of interference affected area of cognitive radio communication device
  9. When there are a plurality of cognitive radio communication devices to use an idle frequency of the primary system, receiving information on an interference influence region from the plurality of cognitive radio communication devices;
    Selecting a cognitive radio communication device having a minimum size of the interference affected area based on the received information; And
    Allocating the idle frequency to the selected cognitive radio communication device;
    / RTI >
  10. 10. The method of claim 9,
    Receiving information on a carrier sensing area, information on a transmission area, and information on an interference area from the plurality of cognitive radio communication devices; And
    Calculating a size of the interference influence region based on the information on the carrier sensing region, the information on the transmission region, and the information on the interference region;
    Frequency sharing method further comprising.
KR1020100014128A 2009-12-16 2010-02-17 Apparatus and Method for Sharing Frequency KR101325291B1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6466793B1 (en) 1999-05-28 2002-10-15 Ericsson Inc. Automatic frequency allocation (AFA) for wireless office systems sharing the spectrum with public systems
KR20090125539A (en) * 2008-06-02 2009-12-07 삼성전자주식회사 Cognitive radio communication system for recogninzing interference based on known signal
US20100303026A1 (en) 2009-05-29 2010-12-02 Motorola, Inc. Method and apparatus for zone controller based dynamic spectrum allocation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6466793B1 (en) 1999-05-28 2002-10-15 Ericsson Inc. Automatic frequency allocation (AFA) for wireless office systems sharing the spectrum with public systems
KR20090125539A (en) * 2008-06-02 2009-12-07 삼성전자주식회사 Cognitive radio communication system for recogninzing interference based on known signal
US20100303026A1 (en) 2009-05-29 2010-12-02 Motorola, Inc. Method and apparatus for zone controller based dynamic spectrum allocation

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Seon Yeong Lee 외 3명, "Cooperative network management in cognitive radio network assisted satellite" *
Seon Yeong Lee 외 3명, "Cooperative network management in cognitive radio network assisted satellite"*

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