KR20130078889A - Emergency disaster communication system - Google Patents

Emergency disaster communication system Download PDF

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Publication number
KR20130078889A
KR20130078889A KR1020120000030A KR20120000030A KR20130078889A KR 20130078889 A KR20130078889 A KR 20130078889A KR 1020120000030 A KR1020120000030 A KR 1020120000030A KR 20120000030 A KR20120000030 A KR 20120000030A KR 20130078889 A KR20130078889 A KR 20130078889A
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KR
South Korea
Prior art keywords
laser
high frequency
signal
repeater
laser beam
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Application number
KR1020120000030A
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Korean (ko)
Inventor
이양기
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이양기
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Publication date
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Priority to KR1020120000030A priority Critical patent/KR20130078889A/en
Publication of KR20130078889A publication Critical patent/KR20130078889A/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
    • H04B7/155—Ground-based stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/26—Cell enhancers or enhancement, e.g. for tunnels, building shadow
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/50—Connection management for emergency connections

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present invention provides a plurality of laser repeaters installed in a service extension area or a shadow area to relay base stations and mobile communication terminals using a laser: a radio signal of a desired frequency band among high frequency signals transmitted and received through a transmit / receive antenna A duplexer for filtering and outputting the transmitted / received channel; A first low noise amplifier receiving a high frequency signal output through a receiving channel of the duplexer to suppress and amplify noise; A preamplifier for amplifying the output signal of the first low noise amplifier; A laser driver controlling generation of a high frequency laser beam according to a signal output from the preamplifier; A laser diode which generates a laser beam under the control of the laser driver and transmits a high frequency laser beam to an adjacent laser repeater through a predetermined transmission lens; An optical signal receiver receiving a laser beam from an adjacent laser repeater through a predetermined receiving lens and generating a corresponding high frequency signal; A band pass filter for detecting a high frequency signal of a desired frequency band among the high frequency signals received through the optical signal receiver; A second low noise amplifier receiving the signal output from the band pass filter to suppress and amplify noise; And a power amplifier receiving and amplifying the signal output from the second low noise amplifier and outputting the amplified signal to a transmission channel of a duplexer. It is simpler to configure and can greatly reduce the installation cost. Also, by not using a local oscillator that down- or up-converts the frequency of the radio signal transmitted to and received from the base station, it is possible to fundamentally change the reference frequency according to the temperature. The present invention provides a mobile communication repeater using a laser beam that can further improve call quality.

Description

Emergency disaster communication system {emergency disaster communication system}

The present invention relates to a mobile communication system, and more particularly, to a mobile communication repeater using a laser beam installed in a shaded area or a service extension area of a wireless base station, which is cheaper in terms of installation time and cost than an optical cable.

Currently, mobile communication services such as digital cellular terminals and personal mobile communication (PCS) are provided, and shaded areas are generated depending on regions, and outdoor base stations or optical relay systems are used to solve such shaded areas. .

In case of using the outdoor base station, the base station oscillation phenomenon is caused by the base station's input frequency and output frequency being the same.

In addition, the optical relay system using the optical antenna and the optical cable can solve the call failure condition of the shadow area by installing only the optical antenna where coverage may be equal to the base station anywhere within 20 km from the base station. In addition, the connection by the optical cable has to use a method such as securing the optical path and laying or leasing, such a method has a lot of constraints in the installation due to the high cost and civil complaints.

Although the optical relay system using the laser beam can solve and expand the shadow area or the service area more conveniently and at a lower cost than the optical cable, it uses a phase locked loop that generates a reference frequency, a high frequency signal for transmitting and receiving and a reference signal. Devices such as mixers that mix frequencies down and down or upconvert still complicate base station configuration and increase the manufacturing cost of the equipment. There was a difficulty in expanding the service area.

In addition, since the local oscillator is very sensitive to temperature, when the device is overheated or overcooled by direct sunlight or cold, the reference frequency for converting a high frequency signal into a predetermined IF signal is changed to restore the IF signal back to a high frequency signal. There was also a problem that the call quality was considerably degraded due to the incorrect frequency.

Accordingly, an object of the present invention is to install a base station using a laser beam in the shadow area or service extension area in the wireless base station, the equipment can be easily configured by amplifying the frequency of the radio signal transmitted and received to the base station without down- or up-converting It is to provide a mobile communication repeater using a laser beam that can significantly reduce the installation cost.

In addition, another object of the present invention is to install a base station using a laser beam in the shadow area or service extension area within the radio base station, by not using a local oscillator to down- or up-convert the frequency of the radio signal transmitted and received to the base station, It is to provide a mobile communication repeater using a laser beam that can further improve the call quality by removing the change in the reference frequency according to the source.

1 is a conceptual diagram illustrating a relay system using a laser beam according to the present invention;
2 is a circuit block diagram showing a main laser repeater according to the present invention;
3 is a circuit block diagram showing an auxiliary laser repeater according to the present invention;
4 is a circuit diagram showing a detailed circuit of the optical signal receiver according to the present invention;
5 is a circuit block diagram showing a laser repeater for relay according to the present invention.

Technical means of the present invention for achieving the above object, in the plurality of laser repeaters installed in the service expansion area or shadow area to relay the base station 10 and the mobile communication terminal 50 with each other using a laser: A duplexer 120 for filtering a radio signal of a desired frequency band among high frequency signals transmitted and received through the reception antenna 110 and outputting the filtered / received channel to the transmit / receive channel (TX, RX); A first low noise amplifier 130 which receives a high frequency signal output through the reception channel RX of the duplexer 120 to suppress and amplify noise; A preamplifier 135 for amplifying an output signal of the first low noise amplifier 130; A laser driver 140 for controlling generation of a high frequency laser beam according to a signal output from the preamplifier 135; A laser diode 145 for generating a laser beam under the control of the laser driver 140 and transmitting a high frequency laser beam to an adjacent laser repeater through a predetermined transmission lens 150; An optical signal receiver 170 which receives a laser beam from an adjacent laser repeater through a predetermined receiving lens 160 and generates a high frequency signal corresponding thereto; A band pass filter 180 for detecting a high frequency signal of a desired frequency band among the high frequency signals received through the optical signal receiver 170; A second low noise amplifier 185 receiving the signal output from the band pass filter 180 to suppress and amplify noise; And a power amplifier 190 for receiving and amplifying the signal output from the second low noise amplifier 185 and outputting the amplified signal to the transmission channel of the duplexer 120.

Preferably the plurality of laser repeater, the main laser repeater 100 is installed in the outer point of the inside of the cell; And an auxiliary laser repeater 200 installed in the service expansion area or the shadow area.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 is a conceptual diagram illustrating a relay system using a laser beam according to the present invention, FIG. 2 is a circuit block diagram showing a main laser repeater in a cell according to the present invention, and FIG. As a circuit block diagram showing an auxiliary laser repeater in a shaded area, a base station 10, a main laser repeater 100, and an auxiliary laser repeater 200 are illustrated.

First, there are shadowed areas inside the cell and outside the cell, which are serviceable areas around the base station 10, and the base station 10 is installed at the center of the cell to the mobile communication terminal 50 inside the cell. The mobile communication service is provided, and the laser repeater 200 is installed in the shadow area to solve the shadow area.

That is, when a shaded area occurs outside the service area of the base station 10, the main laser repeater 100 shown in FIG. 2 is installed at the outer point inside the cell, and the auxiliary laser shown in FIG. By installing the repeater 200 to form an arbitrary laser cell, the shadow area is eliminated, and the mobile communication service is smoothly provided to the subscriber.

Since the laser beams emitted from the laser repeaters 100 and 200 have a straightness and directivity, obstacles (not possible to secure visibility or exceeding the equipment reaching distance) are generated between the main laser repeater 100 and the auxiliary laser repeater 200. Another laser repeater 300 as shown in FIG. 5 may be installed at another point such that the main laser repeater 100 and the auxiliary laser repeater 200 may be relayed.

The main laser repeater 100 as shown in FIG. 2 is installed at an outer point inside the cell, and filters a radio signal of a desired frequency band among high frequency signals transmitted and received from the adjacent base station 10 through the transmit / receive antenna 110. Low-duplex amplifier 130 that receives a duplexer 120 outputting to the transmission / reception channels TX and RX and a high-frequency signal output to the receiving channel RX of the duplexer 120 to suppress and amplify noise. ), A preamplifier 135 for amplifying an output signal of the low noise amplifier 130, a laser driver 140 for controlling generation of a high frequency laser beam according to a signal output from the preamplifier 135, and the A laser diode 145 for generating a laser beam under the control of the laser driver 140 and transmitting a high frequency laser beam to the adjacent laser repeater 200 through a predetermined transmission lens 150 and a predetermined reception lens 160. Through the secondary A high frequency signal of a desired frequency band is detected among the high frequency signals received through the optical signal receiver 170 and the optical signal receiver 170 which receives the laser beam from the low repeater 200 and generates a corresponding high frequency signal. A band pass filter 180, a low noise amplifier 185 that receives the signal output from the band pass filter 180 and suppresses and amplifies the noise, and a signal output from the low noise amplifier 185. After receiving and amplified by a power amplifier (190; High Power Amplifier) for outputting to the transmission channel (TX) of the duplexer 120.

In addition, the auxiliary laser repeater 200 is installed in the shaded area as shown in Figure 3 is installed at the outer point inside the cell, the laser beam is received from the main laser repeater 100 through a predetermined receiving lens 210 An optical signal receiver 220 for generating a corresponding high frequency signal, a band pass filter 230 for detecting a high frequency signal of a desired frequency band among the high frequency signals received through the optical signal receiver 220, and the band pass The low noise amplifier 240 receives the signal output from the filter 230 and suppresses and amplifies the noise, and receives and amplifies the signal output from the low noise amplifier 240 and outputs the signal to the transmission channel of the duplexer 250. Among the high frequency signals transmitted and received from the mobile communication terminal 50 through the power amplifier 245 and the transmit / receive antenna 255, the wireless signal of the desired frequency band is filtered and output to the transmit / receive channels TX and RX. A low noise amplifier 260 that receives a high frequency signal output through the receiving channel RX of the duplexer 250, suppresses noise, and amplifies the output signal of the low noise amplifier 260. The preamplifier 265, the laser driver 270 for controlling the generation of a high frequency laser beam in accordance with the signal output from the preamplifier 265, and generates a laser beam under the control of the laser driver 270 The laser diode 275 transmits a high frequency laser beam to the main laser repeater 100 through a predetermined transmission lens 280.

The configurations of the main laser repeater 100 and the auxiliary laser repeater 200 are the same, but the installation position and whether the RF signal is transmitted or received by the base station 10 or the mobile communication terminal 50 are different from each other. That is, the main laser repeater 100 is installed at an outer point inside the cell, and transmits and receives an RF signal to and from the base station 10 through the transmit / receive antenna 110 and through the other transmit / receive lenses 150 and 160. Transmitting and receiving the laser beam 200 and the laser beam.

In addition, the auxiliary laser repeater 200 is installed in the shadow area outside the cell, and transmits and receives the laser beam with the main laser repeater 100 through the transmission and reception lens (210, 280), and through the other transmission and reception antenna (255) The mobile communication terminal 50 transmits and receives an RF signal.

In addition, the optical signal receiver 170 (or 220) is composed of a photodiode 171 (or 221) and an amplifier 175 (or 275) as shown in FIG. 4, wherein the photodiode 171 is a silicon avalanche photodiode. A high frequency optical signal is received as a silicon avalanche photodiode, and an amplifier amplifies an electric signal generated through the photodiode 171, and a transimpedance is approximately 63 dB up to about 2.3 GHz. To 64dB or more.

As described above, by not using a mixer and a local oscillator which down- or down-converts the frequency of the radio signal unlike the conventional laser repeaters 100 and 200, the installation cost can be reduced by simplifying the equipment and the temperature If you change the frequency of the reference frequency and IF frequency and then restore the frequency again to eliminate the phenomenon of the frequency can be improved the call quality even more.

The operation process of the relay system configured as described above is as follows.

First, when a forward link through which a signal is transmitted from the base station 10 to the mobile communication terminal 50 is described, the main laser repeater 100 is installed outside the service area of the base station 10, and the base station 10 The RF signal transmitted from the RF signal is received through the reception channel RX of the reception antenna 110 and the duplexer 120 and transmitted to the low noise amplifier 130.

The low noise amplifier 130 amplifies the received high frequency signal while suppressing the amplification degree of noise included in the received high frequency signal, and outputs it to the preamplifier 135 to amplify the high frequency signal. The high frequency signal amplified by the preamplifier 135 is applied to the laser driver 140, the laser driver 140 drives the laser diode 145, and the laser diode 145 is a control signal of the laser driver 140. Generates a high frequency laser beam corresponding to the transmitted through the transmission lens 150 to the laser cell in the shaded area.

Subsequently, the auxiliary laser repeater 200 installed in the laser cell 70 receives the laser beam transmitted from the main laser repeater 100 through the receiving lens 210, and the laser beam received through the receiving lens 210 is The optical signal receiver 220 applied to the optical signal receiver 220 and configured as shown in FIG. 4 generates a high frequency electric signal corresponding to the laser beam through the photodiode 221 and amplifies to a predetermined level through the amplifier 225. Done.

The high frequency signal output through the amplifier 225 passes through only a signal of a predetermined frequency band through the band pass filter 230 and removes the unwanted wave and then outputs the low noise amplifier 240. The output of the bandpass filter 230 is amplified while suppressing the noise amplification by the low noise amplifier 240.

The signal amplified by the low noise amplifier 240 is amplified by the power amplifier 245 and then the mobile communication terminal 50 of the subscriber in the laser cell through the transmission channel TX and the transmission antenna 255 of the duplexer 250. To send.

Next, referring to the reverse link through which the signal is transmitted from the mobile communication terminal 50 to the base station 10, the auxiliary laser repeater 200 installed in the shaded area is a high frequency signal (RF) transmitted from the subscriber's mobile communication terminal 50. Signal) is received through the reception channel RX of the reception antenna 255 and the duplexer 250 and transmitted to the low noise amplifier 260.

The low noise amplifier 260 amplifies the received high frequency signal while suppressing the amplification degree of the noise included in the received high frequency signal, and outputs it to the preamplifier 265 to amplify the high frequency signal. The high frequency signal amplified by the preamplifier 265 is applied to the laser driver 270, the laser driver 270 drives the laser diode 275, and the laser diode 275 controls the control signal of the laser driver 270. Generates a high frequency laser beam corresponding to the transmission through the transmission lens 280 to the main laser repeater 100 in the service area.

The amplified signal of the low noise amplifier 185 is amplified by the power amplifier 190 and then a high frequency signal (RF) to the base station 10 in the cell through the transmission channel TX and the transmission antenna 110 of the duplexer 120. Signal).

In the reverse link of the laser repeater 300, a signal transmitted through the transmission lens 280 of the auxiliary laser repeater 200 is received through the reception lens 355 and an electrical signal is received through the optical signal receiver 360. After converting to, the output is converted to an amplifiable level, and the bandpass filter 370 removes the unwanted wave. The output of the bandpass filter 370 is amplified while suppressing the noise amplification by the low noise amplifier 375. The laser driver 380 drives the laser diode 385 by using the output of the low noise amplifier 375, which is driven by the transmission lens 390 to the main laser repeater 100 in the service area. By firing it is to relay the auxiliary laser repeater 200 and the main laser repeater 100.

While specific embodiments of the invention have been described and shown above, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Such modified embodiments should not be understood individually from the technical spirit or the prospect of the present invention, but should fall within the claims appended to the present invention.

10: base station 50: mobile communication terminal
100: main laser repeater 200: auxiliary laser repeater
110,255: Transmit and Receive Antenna 120,250: Duplexer
130,185,240,260: low noise amplifier 135,265: preamplifier
190,245: power amplifier 140,270: laser driver
145,275: laser diode 150, 280: transmission lens
160,210: receiving lens 170,220: optical signal receiver
171,221: photodiode 175,225: amplifier
180,230: bandpass filter 300: repeater laser repeater

Claims (3)

In a plurality of laser repeaters installed in an extended service area or a shadow area to relay base stations and mobile communication terminals to each other using a laser:
A duplexer for filtering a radio signal of a desired frequency band among high frequency signals transmitted and received through a transmit / receive antenna and outputting it to a transmit / receive channel;
A laser diode which generates a laser beam under the control of the laser driver and transmits a high frequency laser beam to an adjacent laser repeater through a predetermined transmission lens;
An optical signal receiver receiving a laser beam from an adjacent laser repeater through a predetermined receiving lens and generating a corresponding high frequency signal;
A band pass filter for detecting a high frequency signal of a desired frequency band among the high frequency signals received through the optical signal receiver;
And a power amplifier for receiving and amplifying a signal output from the second low noise amplifier and outputting the amplified signal to a transmission channel of a duplexer. The method according to claim 1,
The plurality of laser repeaters, the main laser repeater is installed at the outer point inside the cell; And an auxiliary laser repeater installed in the service expansion area or the shadow area. The method according to claim 1,
The optical signal receiver includes: a photodiode for generating an electrical signal of high frequency in response to a laser received through a receiving lens; And an amplifier receiving the output generated by the photodiode and amplifying the voltage and outputting the voltage to a band pass filter.
KR1020120000030A 2012-01-02 2012-01-02 Emergency disaster communication system KR20130078889A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160086675A (en) 2015-01-12 2016-07-20 광운대학교 산학협력단 Base station operating method in isolated E-UTRAN
KR20160086676A (en) 2015-01-12 2016-07-20 광운대학교 산학협력단 Signaling method among base-stations in isolated E-UTRN operation
KR20160150563A (en) 2015-06-22 2016-12-30 광운대학교 산학협력단 Method of managing resources of public safety network
KR20160150562A (en) 2015-06-22 2016-12-30 광운대학교 산학협력단 E-NodeB locating method and apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160086675A (en) 2015-01-12 2016-07-20 광운대학교 산학협력단 Base station operating method in isolated E-UTRAN
KR20160086676A (en) 2015-01-12 2016-07-20 광운대학교 산학협력단 Signaling method among base-stations in isolated E-UTRN operation
KR20160150563A (en) 2015-06-22 2016-12-30 광운대학교 산학협력단 Method of managing resources of public safety network
KR20160150562A (en) 2015-06-22 2016-12-30 광운대학교 산학협력단 E-NodeB locating method and apparatus

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