KR20070110642A - Repeater system and method for frequency converting - Google Patents

Abstract

A frequency conversion relay system and a method are provided to offer a relay service to a primary propagation shadow area and to supply a secondary relay service additionally by using wireless links in plural remote devices, thereby expanding service areas up to small-sized shadow regions. A donor device(300) transmits/receives service channel signals with a base station(200). An optical relay remote device(400) transmits/receives optical signals with the donor device(300), and provides relay services to corresponding shadow regions. A frequency change relay remote device(500) provides relay services to separate shadow regions. In case of downlink, the frequency change relay remote device(500) receives a link channel signal delivered from the remote device(400) to convert the received signal into a service channel signal through frequency conversion, and delivers the converted signal to a mobile station(700) in a corresponding service region.

Description

REPEATER SYSTEM AND METHOD FOR FREQUENCY CONVERTING}

The following drawings, which are attached in this specification, illustrate exemplary embodiments of the present invention, and together with the detailed description of the present invention, serve to further understand the technical spirit of the present invention. It should not be construed as limited to.

1 is a schematic block diagram of a variable wave repeater according to the prior art.

Figure 2 is a schematic diagram of a basic frequency conversion repeater system according to an embodiment of the present invention.

Figure 3 is a schematic diagram of an extended frequency conversion repeater system according to another embodiment of the present invention.

4 to 6 are flowcharts for explaining a frequency conversion relay method according to an embodiment of the present invention in the case of downlink.

7 to 8 are flowcharts for explaining a frequency conversion relay method according to an embodiment of the present invention in the uplink.

Explanation of symbols on the main parts of the drawings

200: base station 300: donor device

310: variable-wave relay donor portion 320: optical relay donor portion

330: first coupler 340: 21st coupler

350: distribution / synthesis device 400: optical relay remote device

410: optical path 500: variable wave relay remote device

600,700 mobile stations

The present invention relates to a mobile communication frequency conversion repeater system and a method thereof, and more particularly, to a frequency conversion repeater system and method for maximizing the operation efficiency by expanding the service area.

Current mobile repeaters are used in terms of mobile phone service coverage in areas where base stations, optical repeaters are difficult to install, and shadowed areas where signals are difficult to reach. In other words, the variable frequency repeater converts the CDMA frequency of the base station into an idle frequency within the cellular frequency band (PCS), that is, converts the unused FA (Frequency Assignment) signal to the antenna and receives it remotely. To convert back to the original frequency signal. Therefore, since the frequency between the input and output antennas are different, oscillation can be prevented, and isolation between antennas is easily secured, so that coverage of a rather large area can be secured, and it is suitable for an area where isolation is difficult.

In this regard, Figure 1 shows a schematic block diagram of a wave repeater according to the prior art.

As shown in FIG. 1, the variable-wave repeater according to the related art includes a donor unit 110 located within a service range of the base station 100 and a remote located in the center of a service area (shading area) to be extended. It is composed of a remote unit (120), and is divided into a forward operation (down-link) and a reverse operation. In the forward operation, the donor unit 110 receives the CDMA frequency f1 transmitted by the base station 100 in order to prevent the loop back phenomenon of the input / output due to spill-over. It changes to another frequency f3 within and transmits it to the remote part 120 to cover the shadow area, and the remote part 120 receives the frequency f3 and transmits the original frequency signal f1 transmitted by the base station 100. ) To provide the service to the mobile station 130.

Similarly, in the reverse operation, the donor unit 120 receives the CDMA frequency f2 transmitted by the mobile station 130, converts it to another frequency f4 in the cellular frequency band, and transmits it to the donor unit 110 in the service area. The unit 110 converts the received frequency f4 into the original frequency signal f2 and transmits it to the base station 100.

However, the variable frequency repeater according to the related art described above necessarily requires an empty frequency band within a band allocated to the repeater. Accordingly, the conventional variable frequency repeater utilizes the idle frequency resources of the cellular frequency band for the link, so it is difficult to provide a multi-frequency number (FA) service due to the lack of frequency resources. In addition, due to the increase in the number of frequencies in accordance with the increase in the number of subscribers, there is a problem that service expansion through a conventional variable repeater (3FA only) is not possible in a city with high in-band frequency usage.

Accordingly, the present invention has been made to solve the problems inherent in the prior art as described above, and an object of the present invention is to provide a frequency conversion repeater system and method for efficiently extending a service area through a plurality of wirelessly linked remote devices. In providing.

In order to achieve the above object, in accordance with an aspect of the present invention, there is provided a frequency conversion repeater system for signal relay between a base station and a mobile station in a mobile communication network: the system is serviced from the base station when it is downlink. Receives a channel signal, converts it into a link channel signal, converts the service channel signal and the converted link channel signal into an optical signal, and outputs it. In the case of an uplink, an optical signal transmitted from the outside is an electrical signal. A donor device which converts the service channel signal and the link channel signal into a service channel signal, converts the extracted link channel signal into a service channel signal, and transfers the service channel signal to the base station together with the extracted service channel signal; In case of the downlink, the optical signal transmitted from the donor device is converted into an electrical signal to extract the service channel signal and the link channel signal, and the extracted service channel signal and the link channel signal are transmitted through a wireless network. In the case of a link, an optical relay remote apparatus for receiving a service channel signal transmitted from a mobile station in a corresponding service area and a link channel signal transmitted outside the corresponding service area, converting the converted optical signal into the optical signal, and transmitting the same to the donor device; In the case of the downlink, the link channel signal transmitted from the optical relay remote device is received, converted into a service channel signal through frequency conversion, and transmitted to the mobile station in the service area, and in the case of the uplink, the corresponding service area. And a variable wave relay remote device converting the service channel signal transmitted from the mobile station within the link channel signal through the frequency conversion and transmitting the converted link channel signal to the optical relay remote device.

In the above configuration, the donor device converts the service channel signal transmitted from the base station into a link channel signal through frequency conversion in the case of the downlink, and outputs the link channel signal to the optical signal received from the outside in the case of the uplink. A transformed relay donor unit converting an included link channel signal into a service channel signal through frequency conversion and transmitting the converted link channel signal to the base station; And in the downlink, receives the service channel signal transmitted from the base station and the link channel signal output from the variable wave relay donor unit, converts and outputs the optical signal, and in the case of uplink, the optical signal received from the outside. And an optical relay donor unit configured to extract the service channel signal and the link channel signal from the signal, transfer the extracted service channel signal to the base station, and transmit the extracted link channel signal to the variable frequency relay donor unit.

In the above configuration, the variable frequency relay donor unit, in the downlink, samples the service channel signal transmitted from the base station through a first coupler, and converts the sampled signal into the link channel signal.

In the above configuration, in the case of the uplink, the variable wave relay donor unit extracts the link channel signal from the optical relay donor unit through a second coupler and converts the extracted signal into the service channel signal.

In the above configuration, the optical relay remote device, in the downlink, amplifies the extracted service channel signal and transfers the amplified service channel signal to a corresponding mobile station in the corresponding service area.

In the above configuration, the optical signal is transmitted / received through an optical line connecting the optical relay donor unit and the optical relay remote device.

According to another aspect of the present invention, there is provided a frequency conversion repeater system for signal relay between a base station and a mobile station in a mobile communication network: the system receives a service channel signal transmitted from the base station in case of a down link. A transformed relay donor unit for converting the link channel signal into an output link and receiving the link channel signal in the uplink, converting the link channel signal to the service channel signal, and transmitting the converted link channel signal to the base station; In the case of the downlink, the link channel signal outputted from the variable frequency relay donor unit is divided into n (arbitrary integer) signals, and in the case of the uplink, the link channel signal is received and received as one signal. A dispensing / compositing device for synthesizing and delivering the synthesized wave to the wave relay donor unit; In the case of the downlink, the service channel signal transmitted from the base station and the n link channel signals transmitted from the distribution / synthesis apparatus are received, converted into n optical signals, and outputted. Receives n optical signals and converts them into electrical signals to extract n service channel signals and link channel signals, transfers the extracted service channel signals to the base station, and distributes the extracted link channel signals to the base station. An optical relay donor portion for transmitting to the apparatus; In the case of the downlink, the optical signal transmitted from the optical relay donor unit is converted into an electrical signal to extract the service channel signal and the link channel signal, and the extracted service channel signal and the link channel signal are transmitted through a wireless network. In case of uplink, n optical relays receive service channel signals from mobile stations in the corresponding service area and link channel signals transmitted from outside the service area, convert them into the optical signals, and transmit them to the optical relay donor. Remote device; In the case of the downlink, the link channel signals are respectively received from the n optical relay remote devices, converted into service channel signals, and transmitted to the corresponding mobile stations in the respective service areas. And n second remote devices which receive the service channel signals transmitted from the mobile stations in the service area, convert the service channel signals into link channel signals, and transmit the converted service channel signals to the corresponding optical relay remote devices.

In the above configuration, the variable frequency relay donor unit, in the downlink, samples the service channel signal transmitted from the base station through a first coupler, converts the sampled signal into the link channel signal, and distributes the distribution. Deliver to the synthesis device.

In the above configuration, in case of the uplink, the variable wave relay donor unit extracts the link channel signal output from the distribution / compositing device through a second coupler and converts the extracted signal into the service channel signal.

In the above configuration, the optical signal is transmitted / received through an optical line connecting the optical relay donor unit and the optical relay remote device.

According to another aspect of the present invention, there is provided a frequency conversion relay method for signal relay between a base station and a mobile station in a mobile communication network, the method comprising: a) receiving a service channel signal from the base station and linking the service channel signal to a link channel; Converting the signal into a signal, and generating and outputting an optical signal including the service channel signal and the link channel signal; b) extracting the service channel signal and the link channel signal by receiving the optical signal, and transmitting the extracted service channel signal and the link channel signal through a wireless network; And c) receiving the transmitted link channel signal, converting it into the service channel signal through frequency conversion, and providing the converted service channel signal to a mobile station in a corresponding service area.

In the above configuration, step a) comprises: a-1) receiving the service channel signal from the base station; a-2) sampling the service channel signal and converting the sampled signal into the link channel signal; a-3) combining the service channel signal and the link channel signal received from the base station, and converting the optical signal into an optical signal.

In the above configuration, the step b) may include b-1) receiving the converted optical signal through an optical line and converting the converted optical signal into an electrical signal; b-2) extracting the service channel signal and the link channel signal from the converted electric signal, and amplifying the service channel signal and transmitting the same through the wireless network; And b-3) transmitting the service channel signal transmitted through the wireless network to a corresponding mobile station in a corresponding service area.

According to yet another aspect of the present invention, there is provided a frequency conversion relay method for signal relay between a base station and a mobile station in a mobile communication network, the method comprising: a) receiving a service channel signal from the mobile station and converting it into a link channel signal; Transmitting the same; b) receiving the outgoing link channel signal and the service channel signal transmitted from the mobile station in a separate service area, and generating and outputting an optical signal including the service channel signal and the link channel signal; c) receiving the optical signal and converting the optical signal into an electrical signal to extract a service channel signal and a link channel signal; And d) converting the extracted link channel signal into a service channel signal through frequency conversion, and transmitting the extracted link channel signal to the base station together with the extracted service channel signal.

(Example)

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

2 illustrates a basic frequency conversion repeater system for signal relay between a base station and a mobile station in a mobile communication network according to an embodiment of the present invention.

As shown in FIG. 2, the system includes a donor device 300 that transmits / receives a service channel signal with a base station 200; An optical relay remote device 400 which transmits / receives an optical signal with the donor device 400 to provide a relay service in a corresponding shadow area; And a variable wave relay remote device 500 which transmits / receives a link channel signal with the optical relay remote device 400 and provides a relay service in a separate shadow area.

When the donor device 300 is a down link, the donor device 300 converts the service channel signal transmitted from the base station 200 into a link channel signal through frequency conversion, and outputs the downlink. In this case, a variable wave relay donor unit 310 converting the link channel signal included in the optical signal received from the optical relay remote device 400 into a service channel signal through frequency conversion and transferring the link channel signal to the base station 200; In the case of the downlink, the service channel signal transmitted from the base station 200 and the link channel signal output from the variable frequency relay donor 310 are received, converted into the optical signal, and outputted. Extracts the service channel signal and the link channel signal from the optical signal received from the optical relay remote device 400, transfers the extracted service channel signal to the base station 200, and transmits the extracted link channel signal to the base station 200. It is configured to include; optical relay donor 320 to deliver to the relay donor 310. In this case, in the case of the variable-wave relay donor 310 and the downlink, the service channel signal transmitted from the base station 200 is sampled through a first coupler Coupler 330, and the sampled signal is converted into the link channel. In the case of the uplink and the uplink, the link channel signal is extracted from the optical relay donor 320 through the second coupler 340. In this case, the first coupler 330 samples the original signal, that is, the signal within the limit that minimizes the level reduction of the service channel signal.

In the case of the downlink, the optical relay remote device 400 converts an optical signal transmitted from the donor device into an electrical signal to extract a service channel signal and a link channel signal, and extracts the extracted service channel signal and link channel signal. To transmit through the wireless network. At this time, the service channel signal transmitted from the optical relay remote device 400 is provided to the corresponding mobile station 600 in the service area. In addition, when the optical relay device 400 is uplinked, the optical relay device 400 receives the service channel signal transmitted from the mobile station 600 in the service area and the link channel signal transmitted from the variable wave relay remote device 500 to receive the optical signal. To the donor device. Here, the optical signal transmitted / received between the donor device 300 and the optical relay remote device 400 is transmitted through an optical line 410 connecting both ends.

In the case of the downlink, the variable wave relay remote apparatus 500 receives the link channel signal transmitted from the optical relay remote apparatus 400, converts the link channel signal into a service channel signal through frequency conversion, and converts it into a service channel signal. It transmits to the mobile station 700. In addition, when the uplink is in the uplink, the optical relay remote device 400 converts the service channel signal transmitted from the mobile station 700 in the service area into a link channel signal through frequency conversion. Send it out.

Hereinafter, with reference to FIG. 3, the configuration of the extended frequency conversion repeater according to another embodiment of the present invention will be described. 3 is a schematic configuration diagram of an extended frequency conversion repeater system according to another embodiment of the present invention.

As shown in FIG. 3, the system includes a donor device 300 that transmits / receives a service channel signal with a base station 200; A plurality of optical relay remote devices 400 for transmitting / receiving an optical signal with the donor device 400 to provide a relay service in a corresponding shadow area; And a plurality of variable wave relay remote devices 500 for transmitting / receiving a link channel signal with the optical relay device 400 and providing a relay service in a separate shadow area. Here, the variable-wave relay remote device 500 is provided in a number corresponding to the optical relay remote device 400, the plurality of optical relay remote device 500 and the variable-wave relay remote device 500 is each service area In the relay service, the relay service for the mobile station 600, 700 is performed, and thus the service area is wider than that of the basic frequency conversion repeater system described with reference to FIG.

The donor device 300 receives a service channel signal transmitted from the base station 200 in the case of a down link, converts the service channel signal into a link channel signal, and outputs the link channel signal. A variable frequency relay donor unit 310 which receives the link channel signal, converts it into the service channel signal, and transmits the link channel signal to the base station; In the case of the downlink, the link channel signal output from the variable wave relay donor 310 is divided into a plurality of signals, and in the case of the uplink, the link channel signals are received and synthesized into one signal. A dispensing / compositing device (350) for transmitting to the wave relay donor (310); In the case of the downlink, the service channel signal transmitted from the base station 200 and the plurality of link channel signals transmitted from the distribution / synthesis device 350 are received, converted into a plurality of optical signals, and output. In the case of a link, a plurality of optical signals are received from the outside and converted into electrical signals to extract a plurality of service channel signals and link channel signals, and the extracted service channel signals are transmitted to the base station 200. And an optical relay donor unit 320 for transmitting the link channel signal to the distribution / synthesis device 350. Here, the link channel signals distributed by the distribution / synthesis device 350 have a number corresponding to that of the optical relay remote device 400.

Each of the optical relay remote device 400, in the downlink, converts the optical signal transmitted from the optical relay donor unit 350 into an electrical signal to extract the service channel signal and the link channel signal, and the extracted The service channel signal and the link channel signal are transmitted through the wireless network. In addition, each of the optical relay remote device 400, in the uplink, receives the service channel signal transmitted from the mobile station 600 in the service area and the link channel signal transmitted from the variable wave relay remote device 500 corresponding to each other. The optical signal is converted into the optical signal and transferred to the optical relay donor 320.

In the downlink, each of the variable wave relay remote apparatuses 500 receives the link channel signal from the corresponding optical relay remote apparatus 400, converts the link channel signal into a service channel signal, and converts the link channel signal into a service channel signal. 700). In addition, each of the wave relay remote device 500, in the uplink, receives the service channel signal transmitted from the mobile station 700 in the service area, converts the service channel signal into a link channel signal, and corresponds to the corresponding link channel signal. It transmits to the optical relay remote apparatus 500. FIG.

Hereinafter, referring to FIGS. 4 to 8, the basic frequency conversion relay method illustrated in FIG. 2 will be described by dividing the downlink operation and the uplink operation. 4 to 6 are flowcharts for describing a frequency conversion relay method according to an embodiment of the present invention during down link, and FIGS. 7 and 8 are embodiments of the present invention during up link. It is a flowchart for explaining the frequency conversion relay method according to an example.

First, the downlink operation will be described with reference to FIGS. 4 to 6.

First, as shown in FIG. 4, the donor device 300 receives a service channel signal from the base station 200, and generates and outputs an optical signal including the service channel signal and the link channel signal (S100). That is, referring to FIG. 5, when the donor device 300 receives the service channel signal from the base station 200 (S110), the variable frequency relay donor 310 receives the service channel through the first coupler 340. The signal is sampled, and the sampled signal is converted into a link channel signal through frequency conversion (S120). Then, the optical relay donor unit 320 converts the service channel signal received from the base station 200 and the converted link channel signal into an optical signal and outputs the converted signal (S130). Here, the optical signal includes a service channel signal and a link channel signal component, respectively.

Then, the optical relay remote device 400 receives the optical signal output from the remote device 300, extracts the service channel signal and the link channel signal, and transmits the extracted signal through the wireless network (S200). ). That is, referring to FIG. 6, the optical relay device 400 receives an optical signal output from the optical relay donor 320 through the optical path 410 and converts the optical signal into an electrical signal (S210). . Thereafter, the service channel signal and the link channel signal are extracted from the converted electric signal, and the amplified signal is transmitted through only radio (S220). Thereafter, the transmitted service channel signal is transmitted to the mobile station 600 in the corresponding service area (S230).

Then, the variable wave relay remote apparatus 500 receives the link channel signal transmitted from the optical relay remote apparatus 400, converts the link channel signal into a service channel signal through frequency conversion, and converts the converted service channel signal into a corresponding service area. It transfers to the mobile station 700 (S300).

Next, the uplink operation will be described with reference to FIGS. 7 and 8.

First, as illustrated in FIG. 7, the wave relay remote device 500 receives a service channel signal from a mobile station 700 in a corresponding service area, converts the service channel signal into a link channel signal, and converts the converted link channel signal into a wireless network. Output through (S400).

Thereafter, the optical relay remote device 400 receives the link channel signal transmitted through the wireless network and the service channel signal transmitted from the mobile station 600 in the corresponding service area, combines them, and generates and outputs an optical signal ( S500).

Then, the donor device 300 receives the optical signal transmitted from each optical relay device 400, extracts the service channel signal and the link channel signal, and converts the link channel signal to the service channel through frequency conversion. The signal is converted into a signal and transmitted to the base station together with the service channel signal extracted from the optical signal (S600). That is, referring to FIG. 8, the optical relay donor 320 receives an optical signal output from the optical relay remote device 400 through the optical line 410 and converts the optical signal into an electrical signal (S610). . Thereafter, the optical relay donor 320 extracts a service channel signal and a link channel signal from the converted electric signal, respectively (S620). Thereafter, the variable frequency relay donor 310 receives the extracted link channel signal through the second coupler 340 and converts the received link channel signal into a service channel signal (S630). Then, the variable wave donor unit 310 transmits the converted service channel signal to the base station 200, and the optical relay donor unit 320 also transmits the extracted service channel signal to the base station 200. .

Meanwhile, the extended frequency conversion repeater system according to another embodiment of the present invention described with reference to FIG. 3 has the same basic operation as the basic frequency conversion repeater system described above. However, in the case of the extended frequency conversion repeater system, the plurality of optical relays from the donor device 300 to transmit an optical signal including a service channel signal and a link channel signal to each of the plurality of optical relay remote devices 400. The same optical signal as the number of remote devices 400 should be output. Therefore, the donor device 300 divides the link channel signal converted by the wave repeater donor unit 310 into a plurality of signals through the distribution / synthesis device 350 and transmits the signal to the optical relay donor device 320. A plurality of optical signals are transmitted to each optical relay remote device 400. Thereafter, the plurality of optical relay remote devices 400 provides the relay service as described above to the mobile stations 600 and 700 in the corresponding service area together with the wave relay remote devices 500 corresponding to the plurality of optical relay remote devices 400.

As described above, the frequency conversion repeater system and method according to the present invention, in the radio wave shaded region in which the optical relay remote device 400 is installed and transmit and receive signals to and from the donor device 300 through the optical line 410 In the service expansion area, that is, the small outlying area, the wave relay remote device 500 is separately provided, thereby relaying between the wave relay remote device 500 and the base station 200 through the signal relay of the optical relay device 400. Provide service. That is, the present invention can extend the service area to a small shadow area through one donor device 300 and a plurality of wirelessly linked remote devices 400 and 500.

As can be seen from the above, the frequency conversion repeater system and method according to the present invention provides a relay service in the primary radio shadow area through the optical relay method, and wireless in a number of remote devices installed in a small out of poor area The use of the link to provide additional secondary relay services enables the expansion of service areas to small shaded areas through low cost, low power equipment.

Although the present invention has been described in detail with reference to the preferred embodiments, the present invention is not limited to the above-described embodiments, and the present invention belongs to the present invention without departing from the gist of the present invention as claimed in the following claims. Anyone skilled in the art will have the technical idea of the present invention to the extent that various modifications or changes are possible.

Claims (14)

In the frequency conversion repeater system for signal relay between a base station and a mobile station in a mobile communication network, In the case of down link, a service channel signal is received from the base station, converted into a link channel signal, and the service channel signal and the converted link channel signal are converted into an optical signal and output. ), Extracts a service channel signal and a link channel signal by converting an optical signal transmitted from the outside into an electrical signal, converts the extracted link channel signal into a service channel signal, and together with the extracted service channel signal. A donor device for transmitting to a base station; In case of the downlink, the optical signal transmitted from the donor device is converted into an electrical signal to extract the service channel signal and the link channel signal, and the extracted service channel signal and the link channel signal are transmitted through a wireless network. In the case of a link, an optical relay remote apparatus for receiving a service channel signal transmitted from a mobile station in a corresponding service area and a link channel signal transmitted outside the corresponding service area, converting the converted optical signal into the optical signal, and transmitting the same to the donor device; In the case of the downlink, the link channel signal transmitted from the optical relay remote device is received, converted into a service channel signal through frequency conversion, and transmitted to the mobile station in the service area, and in the case of the uplink, the corresponding service area. And a variable wave repeater remote device converting the service channel signal transmitted from the mobile station within the link channel signal through frequency conversion to the optical relay remote device. The donor device of claim 1, In the case of the downlink, the service channel signal transmitted from the base station is converted into a link channel signal through frequency conversion and outputted; In the case of the uplink, a variable wave relay donor unit converting a link channel signal included in the optical signal received from the outside into a service channel signal through frequency conversion and transferring the converted link channel signal to the base station; And In the case of the downlink, the service channel signal transmitted from the base station and the link channel signal output from the variable frequency relay donor unit are received, converted into the optical signal, and outputted. In the uplink, the service channel signal and the link channel signal are extracted from the optical signal received from the outside, the extracted service channel signal is transmitted to the base station, and the extracted link channel signal is transmitted to the variable frequency relay donor unit. Optical conversion donor unit for transmitting; frequency conversion repeater system comprising a. The variable wave relay donor unit according to claim 2, In the case of the downlink, the frequency conversion repeater system for sampling the service channel signal transmitted from the base station through a first coupler (Coupler), and converts the sampled signal into the link channel signal. The variable wave relay donor unit according to claim 2, The uplink, frequency conversion repeater system, characterized in that for extracting the link channel signal from the optical relay donor unit through a second coupler, and converts the extracted signal into the service channel signal. The optical relay device of claim 1, A downlink, amplifying the extracted service channel signal and delivering the amplified service channel signal to a corresponding mobile station in the service area. The method according to any one of claims 1 to 5, wherein the optical signal, And a transmission / reception through an optical line connecting the optical relay donor unit and the optical relay remote device. In the frequency conversion repeater system for signal relay between a base station and a mobile station in a mobile communication network, In the case of the down link, it receives the service channel signal transmitted from the base station, converts it into a link channel signal, and outputs it. In the case of the up link, the link channel signal is received. A transformed relay donor unit for converting a service channel signal and transmitting the service channel signal to the base station; In the case of the downlink, the link channel signal outputted from the variable frequency relay donor unit is divided into n (arbitrary integer) signals, and in the case of the uplink, the link channel signal is received and received as one signal. A dispensing / compositing device for synthesizing and delivering the synthesized wave to the wave relay donor unit; In the case of the downlink, the service channel signal transmitted from the base station and the n link channel signals transmitted from the distribution / synthesis apparatus are received, converted into n optical signals, and outputted. Receives n optical signals, converts them into electrical signals, extracts n service channel signals and link channel signals, transfers the extracted service channel signals to the base station, and distributes the extracted link channel signals to the base station. An optical relay donor portion for transmitting to the apparatus; In the case of the downlink, the optical signal transmitted from the optical relay donor unit is converted into an electrical signal to extract the service channel signal and the link channel signal, and the extracted service channel signal and the link channel signal are transmitted through a wireless network. In case of uplink, n optical relays receive service channel signals from mobile stations in the corresponding service area and link channel signals transmitted from outside the service area, convert them into the optical signals, and transmit them to the optical relay donor. Remote device; In the case of the downlink, the link channel signals are respectively received from the n optical relay remote devices, converted into service channel signals, and transmitted to the mobile stations within the respective service areas. And n second remote devices that receive the service channel signals transmitted from the mobile stations in the corresponding service area, convert the service channel signals into link channel signals, and transmit the same to the optical relay remote devices corresponding to the service channel signals. Frequency conversion repeater system. The method of claim 7, wherein the variable frequency relay donor portion, In the case of the downlink, the service channel signal transmitted from the base station is sampled through a first coupler, and the sampled signal is converted into the link channel signal and transmitted to the distribution / compositing device. Frequency conversion repeater system. The method of claim 7, wherein the variable frequency relay donor portion, The uplink, frequency conversion repeater system, characterized in that for extracting the link channel signal output from the distribution / synthesis device through a second coupler, and converts the extracted signal into the service channel signal. The method of claim 7, wherein the optical signal, And a transmission / reception through an optical line connecting the optical relay donor unit and the optical relay remote device. In the frequency conversion relay method for signal relay between a base station and a mobile station in a mobile communication network, a) receiving a service channel signal from the base station, converting the service channel signal into a link channel signal, and generating and outputting an optical signal including the service channel signal and the link channel signal; b) extracting the service channel signal and the link channel signal by receiving the optical signal, and transmitting the extracted service channel signal and the link channel signal through a wireless network; And c) receiving the transmitted link channel signal and converting it into the service channel signal through frequency conversion, and providing the converted service channel signal to a mobile station in a corresponding service area. Way. The method of claim 11, wherein step a) comprises: a-1) receiving the service channel signal from the base station; a-2) sampling the service channel signal and converting the sampled signal into the link channel signal; a-3) combining the service channel signal and the link channel signal received from the base station, converting and outputting the optical signal; and a frequency conversion relay method. The method of claim 11 or 12, wherein b), b-1) receiving the converted optical signal through an optical line and converting the converted optical signal into an electrical signal; b-2) extracting the service channel signal and the link channel signal from the converted electric signal, and amplifying the service channel signal and transmitting the same through the wireless network; And b-3) transmitting the service channel signal transmitted through the wireless network to a corresponding mobile station in a corresponding service area. In the frequency conversion relay method for signal relay between a base station and a mobile station in a mobile communication network, a) receiving a service channel signal from the mobile station, converting it into a link channel signal, and transmitting it; b) receiving the outgoing link channel signal and the service channel signal transmitted from the mobile station in a separate service area, and generating and outputting an optical signal including the service channel signal and the link channel signal; c) receiving the optical signal and converting the optical signal into an electrical signal to extract a service channel signal and a link channel signal; And d) converting the extracted link channel signal into a service channel signal through frequency conversion and transferring the extracted link channel signal to the base station together with the extracted service channel signal; Frequency conversion relay method comprising a.

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