KR20100044651A - Triple band metro optic repeater system and its signal transmisson method - Google Patents

Abstract

PURPOSE: A TMR(Triple band Metro optic Repeater) system and a signal transmission method thereof are provided to enable bidirectional transmission of electric wave through one optical cable after receiving the electric wave from a portable internet base station, thereby reducing the cost of an optical line. CONSTITUTION: An MHU(Main Hub Unit)(100) separates signals of different frequency bands into two or more sector signals. The MHU forms one frame by multiplexing the separated sector signals. The MHU puts the frame to different optical frequency bands. A ROU(Remote Optic Unit)(200) de-multiplexes the signal which is transmitted from the MHU.

Description

TMR system and its signal transmission method {Triple band Metro optic Repeater system and its signal transmisson method}

The present invention relates to a TMR system and a signal transmission method thereof for multiplexing a CDMA / WCDMA / WiBro signal into two sector signals using different frequency bands and transmitting and receiving using one optical cable.

Optical repeaters, which are widely used in mobile communication systems, are used in terms of coverage expansion of base stations to expand mobile phone services in shaded areas where signals of base stations are difficult to reach.

Currently, as mobile communication systems of various frequency bands such as 2G, 3G, and WiBro coexist, base stations of each mobile communication system are often installed in the same space.In this case, each system and each company (KTF / KT / LG) If you use repeaters made differently), it is not good for aesthetic appearance because a large number of repeaters are attached to shaded areas such as platform, waiting room and tunnel of subway, and it is inefficient in manufacturing and installation cost and installation place of repeaters. have.

In addition, as a plurality of repeaters are attached, a plurality of cables are installed, whereby cables are entangled with each other, and when a cable breakdown occurs, a problem that it is difficult to derive a broken cable from many strands of cables may occur. do.

Accordingly, there is a need for a repeater for integrating several frequency band mobile communication systems into one signal and a small number of cables capable of transmitting the integrated signal.

The present invention has been made in an effort to provide a TMR system and a signal transmission method thereof capable of transmitting and receiving a transmission capacity of 7.2 Gbps in one direction in order to solve the disadvantages of the prior art.

In order to achieve the above object, in the TMR system and the signal transmission method of the present invention, signals of Code Division Multiple Access (CDMA), Wideband CDMA (WCDMA), and Wireless Broadband Internet (WBro) using different frequency bands are multiplexed. Therefore, two-way communication can be performed through one optical cable.

The present invention relates to a TMR system, wherein signals of different frequency bands are separated into two or more sector signals, multiplexed by the separated sector signals, and formed into one frame, and then one or more of the frames are divided into different optical frequency bands. It includes a main control device to carry and transmit, demultiplexing the signal transmitted from the main control device received through the optical cable, and includes a remote optical repeater for integrating the demultiplexed signal by frequency and transmitting to each repeater Can be.

In the present invention, the remote optical relay device and the main control device includes an optical filter for separating the sector signal for each optical frequency, a laser diode for transmitting the sector signal, and a photodiode for receiving the sector signal. It may further comprise two optical transceivers.

In the present invention, the signals having different frequency bands may include a first signal, which is a CDMA signal, a second signal, which is a WCDMA signal, and a third signal, which is a WiBro signal.

The present invention may further include a first optical link apparatus for multiplexing the first signal and the second signal and mounting and transmitting the same in one frame and a second optical link apparatus for multiplexing and transmitting a third signal.

The main controller may further include a signal processor configured to demultiplex the signals received from the first and second optical link devices.

In addition, the present invention relates to a signal transmission method of a TMR system, comprising the step of separating signals of different frequency bands into two or more sector signals, and multiplexing each of the separated sector signals by sector signals in one frame. And mounting the two or more frames on which the separated sector signals are mounted, respectively, on different optical frequencies and transmitting them through one optical cable.

In the present invention, the data capacity of the frame may be implemented at 3.6Gbps, and the data transmission capacity of the optical cable may be implemented at 7.2Gbps.

In the present invention, the frame includes a first frame in which a first signal of 2.4 Gbps data capacity and a second signal of 1.2 Gbps data capacity are mounted, and a second signal of 1.2 Gbps data capacity and a third signal of 2.4 Gbps data capacity are mounted. The second frame may be included.

In the present invention, the first signal may be implemented as a CDMA signal, the second signal as a WCDMA signal, and the third signal as a WiBro signal.

Optical frequency used in the optical cable in the present invention can be implemented in 1510nm and 1570nm.

Demultiplexing two or more frames received through the optical cable in the present invention and separating into sector signals, and integrating sector signals of the same frequency band among the separated sector signals transmitted to the repeater of each frequency band It may further include.

According to the present invention, by multiplexing signals using different frequency bands and transmitting them through one optical cable, the number of cables and main controllers that have been used in the past can be reduced, and the installation and operating costs of the system can be reduced.

In addition, since the functions of the digital module and the optical module are simultaneously executed using the FPGA chip inside the remote optical relay, there is an effect of miniaturizing and simplifying the device by eliminating unnecessary interfaces.

In addition, according to the present invention, by using one optical cable to transmit a signal having a capacity of 7.2 Gbps of varying optical frequencies at once, it is possible to reduce the optical cable cost, and to increase the usage per optical cable line to reduce the load due to signal transmission It works.

In addition, there is an effect of environmental beautification as the number of cables and repeaters is reduced by using the TMR system using the integrated remote repeater, compared to the existing system in which the remote repeaters are installed for each frequency band.

Preferred embodiments of the present invention will be described with reference to the accompanying drawings. In adding reference numerals to components of the following drawings, it is determined that the same components have the same reference numerals as much as possible even if displayed on different drawings, and it is determined that they may unnecessarily obscure the subject matter of the present invention. Detailed descriptions of well-known functions and configurations will be omitted.

Figure 1a is a block diagram showing a TMR system according to an embodiment of the present invention, comprising a main controller 100 and a remote optical relay 200, the main controller 100 is a base station and a dedicated circuit (RF cable) ). In addition, although not shown in the drawing, the remote optical relay 200 may be connected to one main controller 100.

The main controller 100 receives the CDMA (2G signal), WCDMA (3G signal) and WiBro signals received through the RF cable, multiplexes the signals, separates them into sector signals, and combines the same sector signals in one frame. It is carried to the remote optical relay device 200.

The main controller 100 includes a 2G transceiver 110 for receiving the CDMA signal, a 3G transceiver 120 for receiving a WCDMA signal, a WiBro transceiver 130 for receiving a WiBro signal, the transceiver 110, 120, Analog interface 140 for converting the analog signal received by the 130 to a digital signal, FPGA 150 for multiplexing and separating the converted digital signal into a sector signal, and optical transmission and reception for transmitting the signal according to the optical frequency The unit 160 is included.

The 2G transceiver 110 is a signal having a frequency range of 1840MHz or more and 1870MHz or less, and may receive, for example, 2G signals of K company and L company. The K company's 2G signal uses a frequency range of 1840 MHz to 1860 MHz, and the L company's 2G signal uses 1860 MHz to 1870 MHz, and the present invention is not limited thereto and may include all signals using the CDMA frequency band. have.

The 3G transceiver 120 is a signal having a frequency range of 2160MHz or more and 2170MHz or less, for example, may receive a 3G signal of K company, but is not limited thereto. The 3G transceiver 120 may include all signals using the WCDMA frequency band.

The WiBro transceiver 130 may be a signal having a frequency range of 2330 MHz or more and 2360 MHz or less. For example, the WiBro transceiver 130 may receive a WiBro signal of K company, but is not limited thereto and may include all signals using the WiBro frequency band.

The analog interface 140 is formed of an analog to digital converter (ADC) and a digital to analog converter (DCA) for converting an analog signal into a digital signal, and digitally converts the analog signal received by the transmitter / receiver 110, 120, 130. The conversion is transmitted to the FPGA unit 150, and the digital signal received from the FPGA unit 150 is converted into an analog signal and transmitted to the transceiver unit 110, 120, 130 according to the frequency band, respectively.

The FPGA (Field Programmable Gate Array) 150 multiplexes (MUX) the digital IF signal received by the analog interface 140, converts the multiplexed electrical signal into an optical signal, and transmits the converted optical signal.

In the multiplexing (MUX) method, signals of each frequency band are separated into sector signals, and the same sector signals are mounted on one frame. More specifically, 2G signals are classified into one sector signal, and 3G signals are divided into one sector. The signal is divided into two sectors and the WiBro signal is divided into two sectors.

In addition, as described above, a signal divided into two sectors may be loaded on the same sector signal in one frame and transmitted by the optical transceiver 160 using different optical frequencies, for example, optical frequencies of 1510 nm and 1570 nm. . Hereinafter, a method of mounting the first and second sector signals in a frame may refer to FIG. 1B.

The sector signal formed by the multiplexing may be converted into an optical signal through an all-optical conversion as an electrical signal, mounted in a frame, and transmitted to the optical transceiver 160.

The optical transceiver 160 may receive first and second sector signals indicating different optical frequencies received by the FPGA unit 150 and transmit them through one optical cable, wherein the sector signals are respectively 3.6 Gbps. The optical cable may represent a data transmission capacity of 7.2 Gbps.

The optical transceiver 160 may increase the usage per optical line of the optical cable by sending the first and second sector signals to two different optical frequency regions by using one optical cable. That is, it is possible to transmit and receive 7.2Gbps transmission data and 7.2GBps received data at one time by using one optical cable. For details, refer to FIG. 1C below.

The remote optical relay 200 separates the sector signal received through the optical cable connected to the main controller 100 for each optical frequency through the filter of the optical transceiver 260, and the sector signal separated for each optical frequency is FPGA After demultiplexing by the unit 250 and integrating the same frequency band, the analog interface 240 performs photoelectric conversion and transmits the signals to each repeater.

The optical transceiver 260 has the same configuration as the optical transceiver 160 of the main controller 100, and the function may be reversed. In other words, the first and second sector signals received from the optical transceiver 160 of the main controller 100 are separated into a first sector signal and a second sector signal through an optical filter and transmitted to the FPGA unit 250.

The FPGA unit 250 demultiplexes each received sector signal (DEMUX) and converts the demultiplexed sector signal into an IF signal.

The analog interface 240 may convert the digital IF signal received by the FPGA unit 250 into an analog signal and transmit the analog IF signal to the transceivers 210, 220, and 230 corresponding to the respective frequencies.

At this time, the transceiver unit 2G transceiver 210 for transmitting and receiving CDMA signals of 1840MHz or more and 1870MHz or less, 3G transceiver 220 for transmitting and receiving WCDMA signals of 2160MHz or more and 2170MHz or less and WiBro transmission and reception for transmitting and receiving WiBro signals of 2330MHz or more and 2360MHz or less The unit 230 may be formed.

1B is a block diagram illustrating a digital unit of the main controller according to an embodiment of the present invention.

Referring to FIG. 1B, the digital unit includes an analog interface 160 and 260, an FPGA unit 150 and 250, and an optical transceiver 160 and 260, and each of the FPGA units 150 and 250 reverses a signal flow from each other.

The FPGA unit 150 of the main controller 100 includes a SUM (thumb 151), a SerDes 154 including a ReFramer (reframe 152) and a Framer (frame, 153).

The SUM 151 sums up the digital signal (it) received from the analog interface 140 according to each frequency band, and serves as a bit-sum.

More specifically, the SUM 151 separates the signals of each frequency band 2G, 3G, and WiBro into sector-specific signals for forward signals (signals flowing from the main controller to the remote optical relay) and reverse signals (remote light). The signals flowing from the relay in the direction of the main controller are separated into sector-specific signals and a 'main' or 'diversity' signal, and the same sector signals and the same main or separation signals are summed.

Looking in more detail with respect to the forward signal, that is, the frame signal flowing in the forward direction, the 2G signal classified as the first sector signal and the divided 3G signal, the divided 3G signal classified as the second sector signal, the WiBro signal, and other DCC (Data Communication) Channel), and a synchronization signal.

The frame signal in the reverse direction includes a 2G signal classified as the first sector signal and a 3G signal divided into two parts, a divided 3G signal classified as the second sector signal and a WiBro signal and a main signal and a separate signal in each sector signal.

The above-configured frame is divided into 2G 1sector and 3G 1sector, WiBro 1sector and 3G 2sector for the optical transmission, and transmits and receives using two optical transceivers with the same capacity.

SerDes 154 is an abbreviation of Serializer DeSerializer, and is located between SUM 151 and optical transceiver 160, and serves as a serializer for converting a parallel signal into a serial signal and vice versa.

In more detail, the Framer 153, which functions as a frame of the SerDes 154, transmits parallel data to serial data in order to transfer each digital signal received from the SUM 151 to an optical line. Converted to and transmitted to the optical transceiver 160.

The ReFramer 152, which reconstructs the frames of the SerDes 154, is a frame reconstructor that separates and reconstructs the frames into respective digital signals to match the received serial data frames with digital signals in the form of 2G, 3G, and Wibro.

That is, the forward signal of the FPGA unit 150 of the main controller 100 including the above-described components 151, 152, 153, 154, 155, and 156 may optically transmit and receive a framed serial signal through the framer 153. The unit 160 transmits the reverse signal to the SUM 151 by dividing the serial data frame received from the optical transceiver 160 into the respective digital signals through the ReFramer 152.

The FPGA unit 250 of the remote optical relay 200 includes a SerDes 154, a ReFramer 152, a Framer 153, a SUM 151, and a Delay 155. And functions to correspond to components of the FPGA unit 150 of the main controller 100.

However, the delay 155 is additionally configured to equally correct delay times of signals transmitted before the signal received by the analog interface 240 moves to the SUM.

That is, the remote optical relay 200 receives a signal transmitted from the main controller 100 through the optical transceiver 260, and the 2G signal and the WiBro signal are serviced as they are, and the 3G signal has two signals. Select one of the sectors to serve. In addition, the signal transmitted from the main controller 100 may be transmitted to the lower remote optical repeater.

In addition, the 3G and WiBro transmission signals of the remote optical relay 200 can be operated efficiently by adjusting the delay time of each signal by the Delay 156 before the analog interface 240 becomes.

Although not shown, the FPGA unit 250 of the receiver of the remote optical relay 200 passes through the analog interface 240, and the delay time of the 3G signal and the WiBro signal of the digital signals received are adjusted by the delay. The 2G signal can be transmitted without adjusting the delay time, and the transmitted signals are selected as main or split in the SUM 151, and the split between main and main is added to the signals transmitted from the lower remote optical repeater. ). In this case, since the 3G signal has two sectors, the 3G signal may be added separately for each sector.

1C is a block diagram illustrating an optical transceiver of a main controller and a remote optical repeater according to an exemplary embodiment.

Referring to FIG. 1C, optical filters 162 and 252, laser diodes 164 and 254, and photo diodes 166 and 256 are included.

The optical transceiver 160 of the main controller and the optical transceiver 260 of the remote optical repeater are divided into two branches for each branch (the transmission path to which the main control device and the remote optical repeater are connected is extended up to 4 branches). It consists of optical filters 162 and 252 and a total of eight diodes, and one optical filter 162 and 252 uses a 3.6 Gbps sector signal using an optical frequency of 1510 nm and a 3.6 Gbps using an optical frequency of 1570 nm. By simultaneously transmitting and receiving sector signals, two-way communication is possible through one fiber of 7.2Gbps.

That is, 3.6Gbps data can be transmitted with one laser diode and 7.2Gbps data can be transmitted with two laser diodes of 1510nm and 1570nm, and one photodiode can receive 7.2Gbps data with two photodiodes. Gbps data can be received.

That is, while light of 1570 nm or 1510 nm optical frequency transmitted by the optical transceiver 160 is totally reflected by an internal 45 ° filter (optical filter 252) to focus on the photodiode 256, 1510 nm or 1570 nm Light of wavelengths can be transmitted 100% in a 45 ° filter.

When two-way simultaneous communication is performed with the same signal, two signals are used because the interference between the signals occurs and the signals cannot be separated. Since there is no interference, it is possible to communicate with signals of the same wavelength (optical frequency) using a single optical fiber.

Therefore, the present invention can increase the amount of use per line because bidirectional communication is divided into two optical frequencies of 1510nm and 1570nm using one strand of optical cable.

FIG. 2 is a diagram illustrating a TMR system according to another embodiment of the present invention. The system may further include an optical link device (OLU) 300 in the configuration of FIG. 1A.

Referring to FIG. 2, a TMR system may be configured with an optical link device 300, a main control device 100, and a remote optical relay device 200, and the main control device 100 may be located in a base station when not in the base station. The optical link devices 300 and 400 are installed, and the optical link devices 300 and 400 and the main control device 100 are connected by optical cables.

The first optical link device (OLU, 300) converts the 2G signal and the 3G signal from the 2G transceiver 310 and the 3G transceiver 320 into an IF signal, which is transmitted through the RF cable of the base station, and the analog IF. After the signal is converted into a digital signal and multiplexed, the signal is transmitted to the main controller 100 by the first signal processor 330 which converts the multiplexed signal into an optical signal.

In this case, the main controller 100 additionally configures a third signal processor 340 in the component of FIG. 1A, demultiplexes a signal received from the first optical link device 300, and transmits a 2G transceiver of a corresponding frequency. 110 and the 3G transceiver 120 to transmit.

When the optical signal is received from the main controller 100 (reverse direction), the first signal processing unit 330 electrically converts the optical signal, and then analog converts the signal generated through demultiplexing and amplifies the signal at a high frequency. To the corresponding sector.

The second optical link device (OLU, 400) receives a WiBro signal transmitted through an RF cable of a base station from the WiBro transceiver 410, and converts the received signal into a digital signal by the second signal processor 420. The signal is converted into an optical signal through multiplexing and transmitted to the WiBro transceiver 130 of the main controller 100.

When the optical signal is received from the main controller 100 (reverse direction), the received optical signal is converted into an electrical signal and demultiplexed, and then converted into an analog signal and transmitted to the corresponding sector of the base station.

3 is a view showing a frame transmitted and received at one time through one optical cable according to an embodiment of the present invention.

Referring to FIG. 3, a 2.4Gpbs CDMA signal (2G) and a 1.2Gbps WCDMA signal (3G) are carried in one frame (first sector) of 3.6 Gbps and transmitted at an optical frequency of 1510 nm. In the second sector, a 2.4Gpbs WCDMA signal 3G and a 1.2Gbps WiBro signal are loaded and transmitted at an optical frequency of 1570 nm. In this case, the optical frequencies to which each frame is transmitted may be changed differently.

As described above, the reason why the data is mounted in the first and second sectors is to transmit CDMA 30MHz Bandwidth, WCDMA 20MHz Bandwidth, and WiBro 27MHz Bandwidth signals, which are triple band signals. As shown in the table, a total capacity of 7.2Gbps is required, and two laser diodes are used to transmit over one optical cable for bidirectional communication.

That is, the first sector composed of CDMA and WCDMA is transmitted through one laser diode, and the second sector signal composed of WCDMA and WiBro is transmitted through one optical cable through another laser diode.

1.CDMA 30MHz Bandwidth

     100 MHz sampling rate, 12-bit, 2-Rx

     Data Rate = 100MHz * 12bit * 2 = 2.4 Gbps

2.WCDMA 20MHz Bandwidth

     50 MHz sampling rate, 12-bit, 2-Sector, 2-Rx

     Data Rate = 50MHz * 12bit * 2 * 2 = 2.4 Gbps

3.WBro 27MHz Bandwidth

     100 MHz sampling rate, 12-bit, 2-Rx

     Data Rate = 100MHz * 12bit * 2 = 2.4 Gbps

4A and 4B are diagrams illustrating a remote optical relay device according to an embodiment of the present invention. FIG. 4A is a top view and FIG. 4B is a side view.

4A and 4B, a power unit 270 for supplying power to the remote optical relay 200, a filter unit 251 for filtering a signal received through an optical cable, and the filtered signal for each module (2G). RF module unit 252 for separating the 3G, WiBro, and amplifiers 253, 254, and 255 for amplifying the received signal for each module, and antennas 212 and 232 for transmitting the amplified RF signal to each repeater.

As described above, it has been described with reference to a preferred embodiment of the present invention, but those skilled in the art various modifications and changes of the present invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

Figure 1a is a block diagram showing a TMR system according to an embodiment of the present invention.

Figure 1b is a block diagram showing a digital unit of the main control device according to an embodiment of the present invention.

Figure 1c is a block diagram showing the optical transceiver of the main controller and the remote optical relay according to an embodiment of the present invention.

2 is a block diagram showing a TMR system according to another embodiment of the present invention.

3 is a view showing a frame transmitted and received at one time through one optical cable according to an embodiment of the present invention.

4A and 4B illustrate a remote optical relay device according to an embodiment of the present invention.

             <Explanation of symbols for main parts of the drawings>

100: main controller (MHU) 110, 210, 310: 2G transmitter and receiver

120, 220, 320: 3G transmitter and receiver 130, 230, 410: WiBro transmitter and receiver

140, 240: analog interface 150, 250: FPGA unit

151: SUM 152: ReFramer

153: Framer 154: SerDes

155: Delay 160, 260: optical transceiver

162, 252: optical filter 164, 254: laser diode

166, 256: photodiode 200: remote optical repeater (ROU)

212: 2G / 3G antenna 232: WiBro antenna

251: filter unit 252: RF module unit

253: 2G Amp 254: 3G Amp

255: WiBro amplifier 252: optical cable entry

270: power supply unit 300: first optical link device (OLU)

330: first signal processor 340: third signal processor

400: second optical link device (OLU) 420: second signal processing unit

Claims (11)

A main control unit for separating signals of different frequency bands into two or more sector signals, multiplexing the separated sector signals into one frame, and then carrying one or more of the frames in different optical frequency bands; And A remote optical repeater for demultiplexing a signal transmitted from the main controller received through an optical cable, and integrating the demultiplexed signal for each frequency to transmit to each repeater; TMR system comprising a. The remote optical relay device and the main control device of claim 1 An optical filter separating the sector signal for each optical frequency; A laser diode transmitting the sector signal; And And two optical transceivers comprising photodiodes for receiving the sector signal. The signal of claim 1, wherein the signals having different frequency bands And a third signal as a CDMA signal, a second signal as a WCDMA signal, and a third signal as a WiBro signal. 4. The apparatus of claim 3, further comprising a first optical link apparatus for multiplexing the first signal and the second signal, mounting and transmitting the same in one frame, and a second optical link apparatus for multiplexing and transmitting a third signal. TMR system. The method of claim 4, wherein the main controller And a signal processor for demultiplexing the signals received from the first and second optical link devices. Separating signals of different frequency bands into two or more sector signals; Multiplexing the separated sector signals for each sector signal and mounting them in one frame; And Mounting two or more frames on which the separated sector signals are mounted at different optical frequencies and transmitting them through one optical cable; Signal transmission method of the TMR system comprising a. 7. The method of claim 6, wherein the data capacity of the frame is 3.6 Gbps, and the data transmission capacity of the optical cable is 7.2 Gbps. The method of claim 6, wherein the frame  A first frame in which a first signal of 2.4 Gbps data capacity and a second signal of 1.2 Gbps data capacity are mounted, and a second frame in which a second signal of 1.2 Gbps data capacity and a third signal of 2.4 Gbps data capacity are mounted. The signal transmission method of the TMR system, characterized in that. The method of claim 8, wherein the first signal is a CDMA signal, the second signal is a WCDMA signal, and the third signal is a WiBro signal. The method of claim 8, wherein the optical frequencies used for the optical cable are 1510 nm and 1570 nm. The method of claim 6, further comprising: demultiplexing two or more frames received through the optical cable into sector signals; And Integrating sector signals of the same frequency band among the separated sector signals and transmitting them to repeaters of each frequency band; Signal transmission method of a TMR system, characterized in that it further comprises.

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