KR100627800B1 - System, apparatus and method for reapeating a digital data - Google Patents

Abstract

The present invention relates to a relay system for transmitting a signal transmitted from a base station to a mobile terminal in a mobile communication system, and in particular, a master optical for converting a code division multiple access physical signal received from the base station to an optical signal. Repeater; A master digital repeater for receiving a code division multiple access physical signal converted into an optical signal from the master optical repeater and converting the code division multiple access physical signal into a digital code division multiple access physical signal; A wired transmission line for transmitting the digital code division multiple access physical signal; A slave digital repeater for converting and transmitting the digital code division multiple access physical signal transmitted through the wired transmission line into an optical signal; And a slave optical repeater for converting an optical signal transmitted from the slave digital repeater into a code division multiple access physical signal and transmitting the converted signal wirelessly through an antenna.

Repeater System, Optical Repeater, Digital Repeater, Master, Slave

Description

DIGITAL WIRED RELAY SYSTEM, APPARATUS AND METHOD {SYSTEM, APPARATUS AND METHOD FOR REAPEATING A DIGITAL DATA}

1 is a view showing a relay system by an optical repeater according to the prior art.

Figure 2 is a diagram showing a relay system by a wireless repeater according to the prior art.

3 is a diagram illustrating a relay system by a digital repeater interlocked with an optical repeater according to a first embodiment of the present invention.

Fig. 4 is a block diagram showing the detailed structure of a master digital repeater in the first embodiment of the present invention.

Fig. 5 is a block diagram showing the detailed structure of a slave digital repeater in the first embodiment of the present invention.

6 is a block diagram showing the detailed structure of a digital signal processing unit in the first embodiment of the present invention;

7 is a diagram illustrating a relay system by a digital repeater interlocked with a base station according to a second embodiment of the present invention.

8 is a block diagram showing the detailed structure of a master digital repeater in a second embodiment of the present invention;

9 is a block diagram showing a detailed structure of a slave digital repeater in a second embodiment of the present invention.

Fig. 10 is a block diagram showing the detailed structure of a digital signal processing unit in a second embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: BTS 110: Master Optical Repeater

120: slave optical repeater 130: antenna

200: master wireless repeater 210, 220: antenna

230: slave wireless repeater 240: amplifier

250: antenna 300: master digital repeater

310, 710: transmission line 320: slave digital repeater

400: signal converter 410, 800: digital signal processor

500: signal converter 510, 900: digital signal processor

600, 1000: transmission data processing unit 610, 1010: compression processing unit

620, 1020: reception data processing unit 700: master digital repeater

720: slave digital repeater 730: physical signal processor

The present invention relates to a relay system, apparatus and method for relaying and retransmitting a signal in a mobile communication system, and more particularly, to a digital relay system, apparatus and method for relaying and retransmitting a signal using a wired transmission line from a base station. will be.

To date, communication services have been developed into two categories: mobile communication and wired communication services. Mobile communication is a technology that provides voice and wireless data services using mobile phones. Advanced Mobile Phone Service system (AMPS), Global System for Mobile communication (GSM) and Inter-Standard-95 (CDMA) code of IS-95 series Division Multiple Access (CDMA) system, cdma2000 1x / Ev-Do (Evolution Data only), Wideband CDMA (WCDMA), and the like. Such technologies are rapidly growing despite the high usage fee due to the feature that the voice communication and wireless data service can be provided anytime, anywhere using a mobile communication terminal.

Currently, the 3G mobile communication system is developing into a 4G (4th Generation) mobile communication system. The fourth generation mobile communication system is not only a simple wireless communication service like the previous generation mobile communication systems, but also aims at efficient interworking and integration services between a wired communication network and a wireless communication network and is faster than the third generation mobile communication system. Techniques for providing data transmission services are being standardized.

Meanwhile, in a general public mobile communication network, a plurality of base stations cover an entire area, and one base station forms one mobile communication network area. Therefore, the mobile terminal transmits and receives data through the wireless channel with the base station within the coverage of the base station. However, there is a problem in that communication between the base station and the mobile terminal is not smoothly performed in an area where radio waves are difficult to reach even in a tunnel or underground mobile communication network service area.

Accordingly, a repeater between the base station and the mobile terminal in order to improve call quality and extend base station coverage for a call dead zone or a geographically blocked region due to geographical features that are difficult to reach in a mobile communication network service area as described above. Will be installed. That is, the repeater is responsible for effectively amplifying and relaying a weak signal in a radio wave shadow area.

The repeater may be an optical repeater, a radio frequency (hereinafter, referred to as 'RF') repeater, a microwave (M / W) repeater, an in building repeater, etc. according to an application area and a repeating method. There is this.

In general, the repeaters are directly connected to a base station and transmitting a signal to a corresponding shielded area, etc., and the relay is installed in the shielded area and receives a signal from the master repeater to retransmit the signal into the shielded area It consists of a slave repeater. In this case, when the connection method of the master repeater and the slave relay period is configured by optical communication, the repeater becomes an optical repeater, and when the connection method is connected by a wireless communication channel, the repeater may communicate with each other by a wireless repeater or a microwave. In the case of a microwave repeater. The various repeaters are appropriately installed depending on the size and type of shielded area.

For example, an optical repeater may be used in an exterior area, and a wireless repeater may be used in an underground tunnel and an underground parking lot. In addition, a microwave repeater may be used in a line of sight shaded area within 5 km, and a repeater in a building may be used in a building such as a small distribution complex.

Hereinafter, a relay system using an optical repeater and a wireless repeater generally used will be described.

1 is a view showing a relay system by an optical repeater according to the prior art.

Referring to FIG. 1, a general optical relay system may include a base transceiver system (hereinafter, referred to as a 'BTS') 100, a master optical repeater 110, and one or more slave optical repeaters 120a to 120n. And antennas 130a to 130n connected to the respective slave optical repeaters 120a to 120n.

The BTS 100 refers to a mobile communication base station that performs signal processing in a code division multiple access (hereinafter, referred to as 'CDMA') method and includes a radio frequency (IF) / intermediate frequency (IF) signal. It communicates with the repeater. Therefore, the BTS 100 and the master optical repeater 110 are connected by an RF cable or the like to transmit a CDMA physical signal as a RF / IF signal.

Meanwhile, the master optical repeater 110 is a repeater master device which is interworked with the BTS 100 by an RF or IF signal (that is, a CDMA physical signal), and branches by the number of sites to which a CDMA physical signal to be transmitted is transmitted. After the conversion, the CDMA physical signal of the branched electrical signal is converted into an optical signal. Then, the master optical repeater 110 transmits the CDMA physical signal converted into the optical signal to the slave optical repeater 120 located at each shaded area site through the optical cable.

In addition, the master optical repeater 110 receives the state / control information of the master optical repeater 110 and the slave optical repeater 120 through communication with a BTS 100 or an EMS (Enterprise Management System) server. As shown, one master optical repeater 110 communicates with a plurality of slave optical repeaters 120 according to the installation environment of the system. In this case, the master optical repeater 110 periodically or intermittently monitors the status / control information of the slave optical repeater 120 in order to report the status information of the slave optical repeater 120 to the EMS server.

The slave optical repeater 120 is located in each shaded area or site for a mobile communication service, and converts the optical signal received from the master optical repeater 110 into an electrical CDMA physical signal and converts the optical signal. The CDMA physical signal is amplified and transmitted over the air through the antenna 130. In addition, the slave optical repeater 120 reports the state / control information of the slave optical repeater 120 through communication with the master optical repeater 110 described above, and the information thus reported is transmitted to the master optical repeater 110. Will report to the EMS server.

Accordingly, even though communication with the BTS 100 is difficult, the mobile terminals located in the shaded area or the site communicate with each slave optical repeater 120 through the antenna 130 to enable communication in the shaded or shielded area. do.

Hereinafter, the communication procedure through the above-described optical relay system will be briefly described. For convenience of description, it is assumed that the BTS 100 supports 2FA omni, and the number of sites in the shadow area is three.

First, as described above, the master optical repeater 110 transmits CFA physical signals of 3FA received from the BTS 100 through an RF cable or the like as many as the master optical repeater 110 wants to service. CDMA physical signals are divided into three CDMA physical signals, and the three signals divided in this way are converted into optical signals and transmitted to each slave optical repeater 120 through a predetermined optical path.

At this time, each of the plurality of sites (for example, three sites) converts the optical signals transmitted in this manner into a CDMA physical signal in which each slave optical repeater 120 has electrical characteristics, amplifies them, and transmits them over the air. do. Through this process, services for three sites are enabled, and the mobile terminal detects the radio signal transmitted as described above and performs communication.

Meanwhile, in the relay system using the optical repeater described above, although the loss and distortion of the CDMA physical signal to be transmitted are small due to the characteristics of the optical line, the optical system is installed between the master optical repeater 110 and each slave optical repeater 120. The installation and leasing costs of the tracks are significant, and after the equipment is installed, continuous management is required, resulting in high management costs. For example, in Korea, the cost of renting a light line of about 3 million won per month is calculated, which has the disadvantage of continuously paying an administrative cost of nearly 40 million won per year. Therefore, there is a problem in that the management cost is usually higher than the cost of the optical repeater device.

The conventional relay system by the optical repeater has been described, and the relay system by the wireless repeater will be described below. The wireless relay system described below may be understood as a concept including an RF relay system relayed by an RF signal and a microwave relay system relayed by a microwave signal for convenience.

2 is a view showing a relay system by a wireless repeater according to the prior art.

Referring to FIG. 2, a general wireless relay system is connected to a base transceiver system (hereinafter, referred to as a 'BTS') 100, a master wireless repeater 200, and a master wireless repeater 200. Antenna 210, one or more antennas 220a through 220n installed at each site, one or more slave wireless repeaters 230a through 230n, one or more amplifiers 240a through 240n, and respective amplifiers 240a through 240n Antennas 250a to 250n connected to the plurality of antennas.

The BTS 100 refers to a mobile communication base station that is in charge of CDMA signal processing as described above, and communicates with a repeater using a radio frequency (RF) / intermediate frequency (IF) signal. Therefore, the BTS 100 and the master wireless repeater 200 are connected by an RF cable or the like to transmit a CDMA physical signal as a RF / IF signal.

Meanwhile, the master wireless repeater 200 is a repeater master device interworking with the BTS 100 by an RF or IF signal (that is, a CDMA physical signal), and branches by the number of sites to which a CDMA physical signal to be transmitted is transmitted. Then, the CDMA physical signal of the branched electrical signal (electrialc signal) is converted to a frequency different from the input RF (in case of RF repeater), or in microwave (in case of microwave repeater). Then, the master wireless repeater 200 transmits the CDMA physical signal converted into the RF signal or the microwave signal to the slave wireless repeater 230 of each site through the antenna 210.

In addition, the master wireless repeater 200 transmits the state / control information of the master wireless repeater 200 and the slave wireless repeater 230 through communication with a BTS 100 or an EMS (Enterprise Management System) server. As illustrated, one master wireless repeater 200 communicates with a plurality of slave wireless repeaters 230 according to the installation environment of the system. In this case, the master wireless repeater 200 periodically or intermittently monitors the status / control information of the slave wireless repeater 230 to report the status information of the slave wireless repeater 230 to the EMS server.

The antenna 210 connected to the master wireless repeater 200 serves to wirelessly transmit the RF or microwave signal transmitted from the master wireless repeater 200, and the signal transmitted from each slave wireless repeater 230. Receives and serves to deliver to the master wireless repeater 200. Therefore, the antennas 220a to 220n located at each site serve as a counter part and an antenna 210 connected to the master wireless repeater 200, and transmit signals transmitted from the master wireless repeater 200. Transfer to the slave wireless repeater 230, and also serves to transmit the signal transmitted from the slave wireless repeater 230 over the air.

The slave wireless repeater 230 is located in each shaded area or site for the mobile communication service, and converts the RF / microwave signal received from the master wireless repeater 200 into a CDMA physical signal, and thus is converted. The CDMA physical signal is transmitted to the amplifier 240. In addition, the slave wireless repeater 230 reports the state / control information of the slave wireless repeater 230 through communication with the above-described master wireless repeater 200, and the information thus reported is transmitted to the master wireless repeater 200. Will report to the EMS server.

In addition, the amplifier 240 receives and amplifies the CDMA physical signal from each slave wireless repeater 230, and transmits the amplified CDMA physical signal wirelessly through each antenna 250.

Accordingly, even though communication with the BTS 100 is difficult, the mobile terminals located in the shaded area or the site communicate with each slave optical repeater 120 through the antenna 250 to enable communication in the shaded or shielded area. do. The relay system through the wireless repeater is generally used when the site to be serviced is small or the user of the terminal is small.

Hereinafter, the communication procedure through the above-mentioned wireless relay system will be briefly described. For convenience of description, it is assumed that the BTS 100 supports 2FA omni, and the number of sites in the shadow area is three.

First, as described above, the master wireless repeater 200 transmits 3FA CDMA physical signals transmitted from the BTS 100 through an RF cable or the like to the number of the master wireless repeaters 200 (ie, three). And then amplify and frequency modulate (i.e., RF or microwave signals of a different frequency than the input RF) and then wirelessly via the antenna 210. Will be sent.

At this time, each of the plurality of sites (for example, three) receives the signal transmitted over the air through the antenna 220 installed at each site and transmits the signal to each slave wireless repeater 230. As such, the modulated signal (that is, the RF signal or the microwave signal) transmitted to the slave wireless repeater 230 is restored to the CDMA physical signal through the slave wireless repeater 230. The CDMA physical signal restored by the slave wireless repeater 230 is amplified to a power amount to be transmitted through the amplifier 240, and then wirelessly transmitted through each CDMA antenna 250 to serve the corresponding site. Can be provided.

On the other hand, in the above-described relay system through a wireless repeater is modulated to the analog signal and transmitted again wirelessly, the loss and distortion of the CDMA physical signal is increased, Signal to Noise Ratio (S / N) ), There is a problem that the characteristics of the deterioration. In addition, although the line cost and installation cost are relatively inexpensive as compared to the above-described optical repeater, the actual frequency use efficiency is considerably lowered due to signal loss caused by transmitting analog signals over a long distance.

In addition, in a place where a large number of terminal users are used, such as downtown, there is a disadvantage in that a frequency higher than necessary is required due to signal loss. For example, if a base station or an optical repeater can accommodate 35 terminal users at the same time at one frequency, the wireless repeater can accommodate 25 users due to signal loss. Therefore, in the case where it is desired to simultaneously accommodate 70 users at the corresponding site, the existing optical repeater or base station can be accommodated even if only two FAs are allocated. This increases the cost of the amplifier 240 to amplify the signal before transmitting wirelessly.

As described above, various optical repeaters or wireless repeaters currently in use have serious problems in cost and performance, respectively. Therefore, a more efficient relay system is required.

Accordingly, an object of the present invention is to provide a digital wired relay system, apparatus, and method for transmitting a signal loss regardless of distance through digital wired transmission between a base station and a site in a relay system of a mobile communication system.

In addition, an object of the present invention, in the relay system of the mobile communication system, by flexibly applying the service frequency and the size of the amplifier, digital wired relay system, apparatus that enables transmission without signal loss regardless of the size of the site to be serviced And providing a method.

It is also an object of the present invention to provide a digital wired relay system, apparatus, and method for relaying a signal without a separate master relay by interworking with a baseband signal of a base station in a relay system of a mobile communication system.

In addition, an object of the present invention, in the relay system of the mobile communication system, digital wired relay system that can reduce the optical line cost while maintaining the same performance as the existing optical repeater through the digital wired transmission between the base station and the site, An apparatus and method are provided.

It is also an object of the present invention to provide a digital wired relay system, apparatus, and method for enabling optical line replacement and relay replacement without changing equipment in a relay system of a mobile communication system.

It is also an object of the present invention to provide a digital wired relay system, apparatus, and method having different functions of control / management / reporting when performing optical line replacement and repeater replacement in a relay system of a mobile communication system. have.

A first system for achieving the above object is a relay system for transmitting a signal transmitted from a base station in a mobile communication system to a mobile terminal, the code division multiple access physical signal to be received from the base station A master optical repeater for converting the optical signal; A master digital repeater for receiving a code division multiple access physical signal converted into an optical signal from the master optical repeater and converting the code division multiple access physical signal into a digital code division multiple access physical signal; A wired transmission line for transmitting the digital code division multiple access physical signal; A slave digital repeater for converting and transmitting the digital code division multiple access physical signal transmitted through the wired transmission line into an optical signal; And a slave optical repeater for converting an optical signal transmitted from the slave digital repeater into a code division multiple access physical signal and transmitting the converted signal wirelessly through an antenna.

The master digital repeater may include: a signal converter converting an optical signal received from the master optical repeater into a digital code division multiple access physical signal; And a digital signal processor for digitally compressing the code division multiple access physical signal transmitted from the signal converter.

The slave digital repeater may include: a digital signal processing unit configured to receive a digital code division multiple access physical signal from a base station through a wired transmission line and convert it into a data format suitable for signal conversion processing; And a signal converter converting the digital code division multiple access physical signal received from the digital signal processor into an optical signal and transmitting the optical signal to a slave optical repeater.

A first master digital relay device for achieving the above object is a master relay device for relaying a signal transmitted from a base station in a mobile communication system and transmitting the same to a mobile terminal, which is received from a master optical repeater linked to the base station. A signal converter for converting an optical signal into a digital code division multiple access physical signal; And a digital signal processor for digitally compressing the code division multiple access physical signal transmitted from the signal converter.

The apparatus may further include a control unit which controls the input signal from the base station to be directly input to the digital signal processor when the baseband signal of the base station is directly input.

The digital signal processor may include a transmission data processor configured to store a digital code division multiple access physical signal transmitted from the signal converter in a memory; A compression processor for compressing the digital code division multiple access physical signal transmitted from the transmission data processor in a predetermined unit; And a reception data processing unit converting the compressed data transmitted from the compression processing unit according to the input format of the wireless signal processing unit.

In addition, the output data format of the reception data processor is characterized in that any one selected from T1, T3, E1, E3, Ethernet, ATM, parallel and serial.

A first slave digital relay device for achieving the above object is a slave relay device for relaying a signal transmitted from a mobile terminal to a base station in a mobile communication system, the digital code division multiple access through the wired transmission line from the base station A digital signal processor for receiving a physical signal and converting the signal into a data format suitable for signal conversion processing; And a signal converter converting the digital code division multiple access physical signal into an optical signal and transmitting the optical signal to a slave optical repeater.

The apparatus may further include a controller configured to directly control the received signal from the mobile terminal to the digital signal processor when receiving a signal obtained by physically processing a signal transmitted from the mobile terminal. .

The digital signal processor may include a transmission data processor configured to store a digital code division multiple access physical signal transmitted from the signal converter in a memory; A compression processor for compressing the digital code division multiple access physical signal transmitted from the transmission data processor in a predetermined unit; And a reception data processing unit converting the compressed data transmitted from the compression processing unit according to the input format of the wireless signal processing unit.

In addition, the output data format of the reception data processor is characterized in that any one selected from T1, T3, E1, E3, Ethernet, ATM, parallel and serial.

A first method for achieving the above object is a relay method for relaying a signal transmitted from a base station in a mobile communication system and transmitting the same to a mobile terminal, wherein the code division multiple access physical signal received from the base station is transmitted. Converting to an optical signal; Receiving the code division multiple access physical signal converted into the optical signal, converting the digital signal division multiple access physical signal, and transmitting the converted signal through a wired transmission line; Receiving and converting the transmitted digital code division multiple access physical signal into an optical signal; And converting the converted optical signal into a code division multiple access physical signal and transmitting the converted signal to the mobile terminal through an antenna.

The wireless signal conversion step may include: a signal conversion step of converting the received optical signal into a digital code division multiple access physical signal; And a digital signal processing step of compressing the converted code division multiple access physical signal.

The optical signal conversion step may include: a digital signal processing step of decompressing a signal received from the base station through a wired transmission line and converting the signal into a data format suitable for signal conversion processing; And a signal conversion step of converting and converting the converted digital code division multiple access physical signal into an optical signal.

A second system for achieving the above object is a relay system for transmitting a signal transmitted from a base station in a mobile communication system to a mobile terminal, the baseband digital code division multiple access physical signal received from the base station A master digital repeater for compressing and transmitting the compressed signal through a wired transmission line; A slave digital repeater for converting a digital code division multiple access signal transmitted from the master digital repeater into a baseband code division multiple access physical signal; And a physical signal processor for converting the signal received from the slave digital repeater into a signal that can be transmitted over the air through analog conversion and up-converting.

The system further comprises an amplifier for amplifying the signal received from the physical signal processor by the power to be serviced over the air.

The master digital repeater may include a digital signal processor configured to compress the baseband digital code division multiple access physical signal received from the base station.

The slave digital repeater may include a digital signal processing unit for receiving a digital code division multiple access physical signal from the base station through a wired transmission line and converting the same into a data format suitable for physical signal processing.

A second master digital relay device for achieving the above object is a master relay device for transmitting a signal transmitted from a base station in a mobile communication system to a mobile terminal, the baseband digital code division multiplex received from the base station And a digital signal processing unit for compressing the connection physical signal.

A second slave digital relay device for achieving the above object is a slave relay device for relaying a signal transmitted from a mobile terminal to a base station in a mobile communication system, the digital code division received from the base station via a wired transmission line And a digital signal processor for converting the multiple access physical signal into a data format suitable for physical signal processing.

A second method for achieving the above object is a relay method for transmitting a signal transmitted from a base station to a mobile terminal in a mobile communication system, the baseband digital code division multiple access physical signal received from the base station Compressing and transmitting the data through a wired transmission line; Receiving the transmitted digital code division multiple access physical signal and converting the baseband code division multiple access physical signal; And converting the converted signal into a signal that can be transmitted over the air through analog conversion and up-converting.

The converting into a digital communication enabled signal may include a digital signal processing step of compressing a baseband digital code division multiple access physical signal received from the base station.

The converting of the digital signal into a baseband code division multiple access physical signal may include converting the digital code division multiple access physical signal received from the base station through a wired transmission line into a data state suitable for physical signal processing. It is characterized by including.

The present invention proposes a digital wired relay system that minimizes installation and management costs of equipment by supplementing the functions of a repeater used for eliminating a shadow area of a frequency and expanding a coverage of a frequency. That is, in order to solve the problems caused by the optical line cost in the conventional optical relay system, the cost is reduced by using the digital wired transmission line instead of the optical line. In addition, in order to solve the problem of performance degradation in general wireless repeaters, a digital repeater which relays through digital communication is proposed.

Therefore, the digital relay system according to the present invention to be described later to minimize the management cost by reducing the expensive optical line rental cost that occupies most of the optical repeater management costs in using the optical repeater. It also minimizes signal distortions and losses seen in conventional wireless repeaters (e.g., wave repeaters, RF repeaters, microwave repeaters, etc.), while maintaining the same signal-to-noise ratio (S / N) as the optical repeater Minimize the effect. In addition, in addition to the optical line reduction cost of the site in which the optical repeater is installed, the repeater and the optical line are not installed in the newly installed site, thereby minimizing the installation cost of the entire equipment.

Prior to describing the present invention, terms used in the following description will be described first. The 'CDMA physical signal' used in the following description is a physical signal capable of CDMA communication through a process of encoding, modulating and filtering a voice signal or a data signal for communication. It refers to a state in which a signal has become, and this signal is called a 'digital CDMA physical signal'. In addition, a signal obtained by converting such a digital CDMA physical signal into an analog signal is called an 'analog CDMA physical signal'.

Meanwhile, the 'digital communication signal' generally refers to a physical layer signal of a communication signal that uses a digital modulation method such as CDMA, and mainly refers to CDMA / TDMA / WCDMA / UMTS / TRS / Wibro / OFDM, etc. The physical layer signal used in the same communication method.

In the following description, two embodiments are proposed. First, the first embodiment proposes a digital repeater that can replace the optical line in order to reduce the expensive optical line cost in the place where the conventional optical repeater is installed, in the second embodiment, in the case of newly installing the base station, the shaded area In order to solve the problem of replacing the repeater with the system according to the present invention without installing a repeater as in the prior art. This enables the construction of a relay system that maintains high performance and minimizes repeater and optical line management and installation costs.

Hereinafter, a detailed description of a preferred embodiment of the present invention will be described with reference to the accompanying drawings. In the following description, detailed descriptions of well-known functions or configurations will be omitted when it is determined that the detailed descriptions of the known functions or configurations may unnecessarily obscure the subject matter of the present invention.

First, a relay system by a digital repeater interlocking with an optical repeater according to a first embodiment of the present invention will be described with reference to FIGS. 3 to 5. As described above, in the first embodiment to be described later, in order to reduce the expensive optical line cost in the area where the optical repeater is already installed, the optical line is replaced with a relatively cheap wired transmission line compared to the digital repeater and the optical line according to the present invention. do. By doing so, it is possible to provide high signal-to-noise ratio as well as reducing optical line costs.

3 is a diagram illustrating a relay system using a digital repeater interlocked with an optical repeater according to a first embodiment of the present invention.

Referring to FIG. 3, the relay system according to the first embodiment of the present invention includes a base transceiver system (hereinafter, referred to as a 'BTS') 100, a master optical repeater 110, a master digital repeater 300, One or more wired transmission lines 310a to 310n connected to each site in the master digital repeater 300, and the master digital repeater 300 is installed at each site and through each wired transmission lines 310a to 310n. And one or more digital slave repeaters 320a to 320n connected to each other, one or more slave optical repeaters 120a to 120n, and antennas 130a to 130n connected to the respective slave optical repeaters 120a to 120n. .

The BTS 100 refers to a mobile communication base station that performs signal processing in a code division multiple access (hereinafter, referred to as 'CDMA') method and includes a radio frequency (IF) / intermediate frequency (IF) signal. It communicates with the repeater. Therefore, the BTS 100 and the master optical repeater 110 are connected by an RF cable or the like to transmit a CDMA physical signal as a RF / IF signal.

On the other hand, the master optical repeater 110 is a repeater master device that interoperates with the BTS 100 by an RF or IF signal (that is, a CDMA physical signal), and the conventional master optical repeater 110 described with reference to FIG. It is possible to reuse. That is, the master optical repeater 110 branches after the number of sites to transmit the CDMA physical signal to be transmitted, and then converts the CDMA physical signal of the branched electrical signal into an optical signal. Will be converted. Then, the master optical repeater 110 transmits the CDMA physical signal converted into the optical signal to the master digital repeater 300 according to the present invention through the optical cable. At this time, between the master optical repeater 110 and the master digital repeater 300 may be implemented as a short distance optical line within a few m as an optical line for the optical signal interface (interface).

The master digital repeater 300 receives a CDMA physical signal converted into an optical signal from the master optical repeater 110 and converts it into an electrical signal, and thus converts the CDMA physical signal converted into an electrical signal into a digital signal. Done. Thereafter, the converted digital signal is subjected to digital signal processing such as compression, and then transmitted to the slave digital repeater 320 through the wired transmission line 310. In addition, the master digital repeater 300 converts a digital CDMA physical signal received at each site (that is, a slave digital repeater 320) into an analog optical signal as a reverse link and transmits the analog CDMA physical signal to the master optical repeater 110. Do this. In this case, the master digital repeater 300 may configure a plurality of devices (for example, n) according to the number or functions of the devices having the same function as described above. The detailed structure and function of the master digital repeater 300 will be described later in the description of FIG. 4.

The wired transmission line 310 transmits the digital CDMA physical signal converted by the master digital repeater 300 to each site, and the digital CDMA physical signal of the reception link transmitted by the slave digital repeater 320. (I.e., a reverse signal) to the master digital repeater 300. That is, the wired transmission line 310 connected to the master digital repeater 300 performs 1: 1 communication with the slave digital repeater 320. Accordingly, each wired transmission line 310 receives a signal transmitted from the master digital repeater 300 or transmits a signal from a slave digital repeater 320 to the master digital repeater 300. . At this time, the wired transmission line 310 is T1, T3, E1, E3, Ethernet (Ethernet), ATM according to the signal processing method of the digital repeater (that is, the master digital repeater 300 and the slave digital repeater 320) It can be a transmission line for data formats such as parallel, serial, and serial.

Meanwhile, the slave digital repeater 320 converts the digital CDMA physical signal received from the master digital repeater 300 into an RF signal. Thereafter, the converted RF signal is converted into an optical signal, and then transmitted to the slave optical repeater 120 through a predetermined optical line. In addition, the slave digital repeater 320 performs a function of converting an optical signal received from the slave optical repeater 120 into a digital CDMA physical signal as a reverse link and transmitting the converted digital signal to the master digital repeater 300. The detailed structure and function of the slave digital repeater 320 will be described later in the description of FIG. 5.

The slave optical repeater 120 is a device located in a shadowed area or site and interoperates with the slave digital repeater 320, and the conventional slave optical repeater 120 described in FIG. 1 may be reused in the same manner. That is, the slave optical repeater 120 converts an optical signal received from the slave digital repeater 320 into a CDMA physical signal, amplifies the converted CDMA physical signal, and performs an air phase over the antenna 130. Will be sent to. In addition, the slave optical repeater 120 receives the CDMA physical signal transmitted from the mobile terminal through the antenna 130, converts the optical signal through the reverse process to the optical signal after the slave digital repeater through the optical line And to 320.

Accordingly, even though communication with the BTS 100 is difficult, the mobile terminals located in the shaded area or the site communicate with each slave optical repeater 120 through the antenna 130 to enable communication in the shaded or shielded area. do.

In addition, according to the present invention, there is no expensive optical line between the master optical repeater 110 and the slave optical repeater 120, and the optical line cost can be reduced by using a digital repeater and a low cost wired transmission line as described above. You can save. In addition, in using the repeater, it is possible to minimize signal distortion and loss due to wireless communication by using a digital repeater that transmits and receives a digitally converted digital CDMA physical signal.

Hereinafter, the communication procedure through the digital relay system according to the first embodiment of the present invention will be briefly described. For convenience of description, it is assumed that the BTS 100 supports 2FA omni, and the number of sites in the shadow area is three.

First, as described above, the master optical repeater 110 transmits CFA physical signals of 3FA received from the BTS 100 through an RF cable or the like as many as the master optical repeater 110 wants to service. CDMA physical signals are divided into three signals, and the three divided signals are converted into optical signals and transmitted to each master digital repeater 300 through a predetermined optical line.

According to the present invention, the master digital repeater 300 converts each optical signal back into an electrical signal, that is, a CDMA physical signal, and down converts and analog / digital converts the converted physical signal. Then, after modulating the digital CDMA physical signal, the modulated signal is transmitted to each site through the wired transmission line 310. At this time, the master digital repeater 300 operates three master digital repeater 300 modules to transmit CDMA physical signals to three sites.

As described above, the digital CDMA physical signal transmitted through each wired transmission line 310 is transmitted to the slave digital repeater 320 of each site. The slave digital repeater 320 converts the received digital CDMA physical signal through analog signal conversion and up converting through signal demodulation, and then converts the received digital CDMA physical signal into an optical signal and transmits the converted optical signal to the slave optical repeater 120. The slave optical repeater 120 converts and amplifies the received optical signal into a CDMA RF signal, and transmits the amplified optical signal through the antenna 130. In the case of the reverse link, the above-described procedure is performed in reverse.

Hereinafter, detailed structures and operations of the master digital repeater 300 and the slave digital repeater 320 in the above-described first embodiment will be described with reference to FIGS. 4 and 5.

4 is a block diagram showing the detailed structure of the master digital repeater 300 in the first embodiment of the present invention.

Referring to FIG. 4, the master digital repeater 300 may include a signal converter 400a to 400n and a digital signal processor 410a to 410n. The signal converter 400 and the digital signal processor 410 may be configured as one module, and the number of modules is determined according to the number of sites to be serviced. In FIG. 4, n modules are illustrated.

The signal converter 400 converts the optical signal received from the above-described master optical repeater 110 into a CDMA RF physical signal, converts the converted RF physical signal into an IF signal, and then converts the digital signal into a digital CDMA physical signal. It performs the function. In the reverse case, the digital CDMA physical signal transmitted from the digital signal processor 410 is converted into an analog IF or baseband signal, and then converted into an RF signal, and the converted RF signal is converted into an optical signal. It performs the function.

The digital signal processor 410 compresses the digital CDMA signal transmitted from the signal converter 400 and converts the digital CDMA signal into a data type suitable for transmission through the wired transmission line 310 described above. For example, when the transmission format of the wired transmission line 310 requires a format such as serial / parallel / T1 / E1 / Ethernet / ATM (asynchronous transmission mode), It is responsible for matching the data format. On the contrary, in the reverse link, the data received through the wired transmission line 310 is matched with the data format of the signal converter 400.

On the other hand, although not shown in the figure, the master digital repeater 300 may be implemented to be responsible for monitoring and controlling the states of the master digital repeater 300 and the slave digital repeater 320 by including a control unit. At this time, the control unit transmits and reports information of the master digital repeater 300 and the slave digital repeater 320 through communication with the EMS server. In addition, the control unit collects the status / control information of the slave digital repeater 320 and transmits to the EMS server. In addition, when the master digital repeater 300 is interlocked with the baseband of the BTS 100 as in the second embodiment to be described later, rather than in conjunction with the master optical repeater 110 as in the first embodiment, The correct control will be performed.

5 is a block diagram showing the detailed structure of the slave digital repeater 320 in the first embodiment of the present invention.

Referring to FIG. 5, the slave digital repeater 320 may include a signal converter 500 and a digital signal processor 510. In this case, the signal converter 500 and the digital signal processor 510 may be configured as one module and installed at each site to be serviced.

The signal converter 500 converts the digital CDMA physical signal received from the digital signal processor 510 into an analog CDMA RF physical signal of IF / RF, converts the converted RF physical signal into an optical signal, and converts the slave optical signal. Transmission to the repeater 120. In the reverse direction, the optical signal transmitted from the slave optical repeater 120 is changed into a CDMA RF signal which is an electrical signal, and the converted CDMA RF physical signal is converted into an analog IF or BB, and finally, a digital CDMA physical signal. Converts to and transmits the digital signal to the digital signal processor 510.

In the case of the forward link, the digital signal processor 510 converts the digital CDMA signal received through the wired transmission line 310 into data suitable for the signal converter 500. For example, when the transmission data format of the wired transmission line 310 requires a format such as serial / parallel / T1 / E1 / Ethernet / ATM, the data format for the wired transmission line 310 is received. In addition, the signal converting unit 500 converts the analog signal into a suitable analog signal.

Meanwhile, although not shown in the drawing, the slave digital repeater 320 may include a control unit to implement the state monitoring and control of the slave digital repeater 320. In this case, the control unit of the slave digital repeater 320 transmits control information to the EMS server through communication with the control unit of the master digital repeater 300. In addition, when the master digital repeater 300 is interlocked with the baseband of the BTS 100 as in the second embodiment to be described later, rather than in conjunction with the master optical repeater 110 as in the first embodiment, The correct control will be performed.

Hereinafter, detailed operations of the master digital repeater 300 and the slave digital repeater 320 according to the present invention described above with reference to FIGS. 4 and 5 will be described. For convenience of explanation, it is assumed that only three sites are supported.

First, as described above, the master optical repeater 110 transmits CFA physical signals of 3FA received from the BTS 100 through an RF cable or the like as many as the master optical repeater 110 wants to service. CDMA physical signals are divided into three signals, and the three divided signals are converted into optical signals and transmitted to each master digital repeater 300 through a predetermined optical line.

According to the present invention, the master digital repeater 300 converts each optical signal into an electrical signal, that is, a CDMA physical signal, in the signal conversion unit 400 described above, and down converts the converted physical signal. And analog / digital conversion. Then, the digital signal processor 410 converts the converted digital CDMA physical signal into a data format suitable for transmission of the wired transmission line 310. Here, the master digital repeater 300 operates three modules to transmit CDMA physical signals to three sites.

Meanwhile, the digital CDMA physical signal processed by the digital signal is transmitted to the slave digital repeater 320 of each site through the wired transmission lines 310, and the digital signal processor 510 of the slave digital repeater 320 is The received digital CDMA physical signal is decompressed, processed into a digital signal with data suitable for the signal converter 500, and transmitted to the signal converter 500.

The signal converter 500 converts the digital CDMA physical signal from the digital signal processor 510 into an analog signal and then undergoes an up converting process. Then, it is converted back to the optical signal and transmitted to the slave optical repeater 120. At this time, the slave optical repeater 120 amplifies the CDMA RF signal received from the signal conversion unit 500 and transmits the radio signal through the antenna 130. In the case of the reverse link, the above-described procedure is performed in reverse.

Hereinafter, detailed structures of the digital signal processing units 410 and 510 which are commonly used in the master digital repeater 300 and the slave digital repeater 310 will be described in detail with reference to FIG. 6.

6 is a block diagram showing a detailed structure of the digital signal processing units 410 and 510 in the first embodiment of the present invention.

Referring to FIG. 6, the digital signal processing units 410 and 510 described above with reference to FIGS. 4 and 5 may include a transmission data processing unit 600, a compression processing unit 610, a reception data processing unit 620, and the like.

First, the transmission data processing unit 600 is a device that functions to store data of the transmission portion of the BTS (100). That is, the transmission data processing unit 600 is a device for storing the digital CDMA physical signal transmitted from the signal conversion unit 400 described above in a memory such as FIFO / RAM, and processes the data to be compressed in the compression processing unit 610. A device that stores data while it is running. In addition, the apparatus converts the digital CDMA physical signal decompressed by the compression processor 610 into a data format suitable for the format of the A / D converter in the signal converter 400.

Meanwhile, a general A / D converter supports 14 bits, and at this time, the 16 bits of data transmitted from the compression processor 410 are converted into 14 bits, and the compression processor 410 transmits the data. It is a device that serves to convert the non-periodic (burst) data into the periodic data to the signal conversion unit 400.

The compression processor 610 generally processes data in units of 8 bits, and in the present invention, it is preferable to process data in units of 16 bits. The compression processor 610 compresses the digital CDMA physical signal transmitted from the transmission data processor 600 in a predetermined unit (for example, in units of 1K bytes) and then compresses the digital CDMA physical signal by the received data processor 620. It will transmit data. In addition, the signal processing unit 610 transmits a signal pattern for synchronization while the data is not transmitted by the compression processor 610.

In addition, the compression processor 610 serves to release the compressed information of the compressed data transmitted from the received data processor 620 and transmit the compressed information to the transmission data processor 600. In this case, the general CDMA data has a compression ratio of about 70% as a 2's complement or offset binary code having a random characteristic. Therefore, in the present invention, by compressing and transmitting the CDMA data through the compression processing unit 610 as described above, it is possible to transmit more data than the data rate (data rate) that can actually be transmitted, thereby maximizing the use efficiency of the channel. It has the advantage of being able to.

The received data processing unit 620 is a device having a function opposite to that of the transmission data processing unit 600 (a function of a countpart), and the compressed data transmitted from the compression processing unit 610 that compresses the data received from the BTS 100. Is a device for converting the input signal into an input format of the wireless signal processor 420. As described above, the input data of the wireless signal processor 420 may have a signal format such as T1, T3, E1, E3, Ethernet, ATM, parallel, serial, and the like. The data processor 620 converts the data into a data format suitable for this and transmits the converted data to the wired transmission line 310.

In addition, the compressed data received through the wired transmission line 310 as a receiver function of the received data processing unit 620 according to the transmission format of the wired transmission line 310 T1, T3, E1, E3, Ethernet (Ethernet) ), ATM, parallel, serial, and the like, and are converted into 16-bit data suitable for processing by the compression processor 610. In addition, after storing the data in a storage device such as a FIFO / RAM, when all the compressed files are stored, the data is transmitted to the compression processor 610.

On the other hand, according to the present invention as described above by having a compression processing unit 610 in the digital signal processing unit 410, 510, and has a further advantage described later by compressing and transmitting the transmission signal.

First, in addition to the above-described advantages, it is possible to transmit more data than the actual wireless or wired transmission capability through compression, thereby maximizing the frequency efficiency and channel use efficiency. For example, assuming that the compression rate of the digital CDMA physical signal is 70%, and that the information transmission capability of a medium (wired / wireless) that can be transmitted is 1 Mbps, while a conventional CDMA physical signal of 1 Mbps can be transmitted, According to the present invention it is possible to transmit data of 3Mbps.

In general, voice data is compressed by EVRC or QCELP, and data such as video is compressed by using data such as MPEG2 / 4. In order to perform mobile communication with the compressed data, In order to convert a modem into a physical signal, a process of encoding, modulation, and filtering is performed. However, in the present invention, by compressing and transmitting the converted physical signal again, the signal transmitted by the conventional optical fiber can be transmitted using digital communication such as T3, E3, ATM, etc., which has a relatively small bandwidth. .

As described above, a relay system using a digital repeater interlocking with an existing optical repeater according to the first embodiment of the present invention has been described with reference to FIGS. 3 to 6. Next, a relay system by a digital repeater interoperating with a baseband of a base station according to a second embodiment of the present invention will be described with reference to FIGS. 7 to 10.

As described above, in the second embodiment to be described later, when the repeater is installed in a new site or when the same function is performed without using the optical repeater, the digital repeater according to the present invention can be replaced. By doing so, it is possible to provide high signal-to-noise ratio as well as reducing optical line costs.

7 is a diagram illustrating a relay system by a digital repeater interworking with a base station according to a second embodiment of the present invention.

Referring to FIG. 7, the relay system according to the second embodiment of the present invention includes a base transceiver system (hereinafter, referred to as a 'BTS') 100, a master digital repeater 700, and a master digital repeater 700. Wired transmission lines 710a through 710n, one or more digital slave repeaters 720a through 720n, one or more physical signal processors 730a through 730n, and one or more amplifiers 240a through 240n connected to one or more respective sites in And antennas 250a to 250n connected to the respective amplifiers 240a to 240n.

The BTS 100 refers to a mobile communication base station that performs signal processing in a code division multiple access (hereinafter, referred to as 'CDMA') method. Unlike the first embodiment, the BTS 100 is a second embodiment. In the example, rather than interworking with the RF-modulated analog CDMA physical signal, the digital baseband CDMA physical signal (or digital IF CDMA physical signal) is processed. That is, the baseband physical signal of the BTS 100 can be directly transmitted to the master digital repeater 700. As a result, a repeater having a conventional complicated signal conversion process becomes unnecessary.

On the other hand, the transmission path between the BTS 100 and the master digital repeater 700 is a line for transmitting the digital baseband signal of the BTS 100, generally a pattern or a short distance of the back plane (back plane) UTP (Unshield Twisted Pair) cable suitable for transmission can be used. Alternatively, an optical cable may be used for stable transmission of the signal.

The master digital repeater 700 performs the same function as the master digital repeater 300 in the above-described first embodiment. However, although the master digital repeater 300 in the first embodiment described above is interlocked with the optical signal of the master optical repeater 110 connected to the BTS 100 by an optical signal, the master digital repeater 700 in the second embodiment is a BTS. It is directly linked to the digital baseband signal of (100).

That is, the master digital repeater 700 converts the digital baseband signal received from the baseband of the BTS 100 into a digital CDMA physical signal through a modulation process, and then performs a predetermined digital signal processing process such as compression. Through the wired transmission line 710 to be transmitted to the slave digital repeater 720. In addition, the master digital repeater 700 decompresses the digital CDMA physical signal transmitted from each site (ie, slave digital repeater 720), converts it into a digital baseband signal, and transmits the digital CDMA signal to the baseband of the BTS 100. Perform the function.

On the other hand, the relay system according to the second embodiment of the present invention can perform signal transmission through a simpler procedure than when replacing the optical repeater line in the first embodiment described above. In addition, as described above in the first embodiment, the master digital repeater 700 may configure a plurality of devices (for example, n) according to the number or functions of sites having the same function. Detailed structure and function of the master digital repeater 700 will be described later in the description of FIG. 8.

The wired transmission line 710 transmits a digital CDMA physical signal processed by the master digital repeater 700 on the radio, and also receives a digital CDMA physical of a reception link transmitted from a slave digital repeater 720. It performs the function of transmitting a signal (that is, a reverse signal). That is, the wired transmission line 710 connected to the master digital repeater 700 performs 1: 1 communication with each of the slave digital repeaters 720.

Meanwhile, the slave digital repeater 720 converts the digital CDMA physical signal received from the master digital repeater 700 into a digital baseband CDMA physical signal, and converts the converted digital baseband CDMA physical signal into a physical signal processor 730. Will be delivered. On the contrary, in the reverse link, the digital baseband CDMA physical signal transmitted from the physical signal processor 730 is converted into a digital CDMA physical signal, and then, through the predetermined compressed signal processing, the master is transmitted through the wired transmission line 720. Transmitted to the digital repeater 700 side. Detailed structure and function of the slave digital repeater 720 will be described later in the description of FIG.

The physical signal processor 730 is generally called a transceiver, and its main functions are as follows. In the forward link processing for processing a signal transmitted from a base station, the digital baseband CDMA physical signal received from the slave digital repeater 720 is converted into an analog signal, the analog signal is modulated into an RF signal, and then an amplifier. To 240. On the contrary, in the reverse link processing for transmitting the received signal to the base station, the RF signal received from the antenna 250 is converted into an IF or baseband signal and then converted into a digital baseband signal. The digital baseband signal converted by the physical signal processor 730 is transmitted to the base station (ie, the BTS 100) through the slave digital repeater 720.

The amplifier 240 is a device for amplifying an RF signal received from the physical signal processor 730, and includes a low noise amplifier (LNA) / high power amplifier (HPA) / linear power amplifier (LPA). And the like. That is, the amplifier 240 can adjust the power of the transmission output according to the range to be serviced.

Accordingly, even though communication with the BTS 100 is difficult, the mobile terminals located in the shadowed area or the site can communicate in the shadowed or shielded area by communicating through each antenna 250.

In addition, when a new site is added according to the present invention, by using only the present invention without providing a conventional optical repeater or a wireless repeater, it is possible to have better signal characteristics than an optical repeater or a wireless repeater. That is, in the conventional optical repeater, there is a disadvantage in that the optical signal and electrical signal conversion and line loss are added to the signal, and in the case of the wireless repeater, there are frequency modulation and signal loss occurring in the radio. According to the second embodiment of the present invention, there is the same signal characteristic as in the case of amplifying a conventional base station directly through an amplifier. This can increase the frequency efficiency, and has the advantage of serving the same subscriber even using less frequency than the conventional method.

Hereinafter, the communication procedure through the digital wired relay system according to the second embodiment of the present invention will be described briefly. For convenience of description, it is assumed that the BTS 100 supports 2FA omni, and the number of sites in the shadow area is three.

First, as described above, the master digital repeater 700 converts the baseband digital CDMA physical signal received from the BTS 100 into a data format suitable for transmission of the wired transmission line 710, and then the wired transmission. The modulated signal is transmitted through the line 710. In this case, the master digital repeater 700 operates three master digital repeater 700 modules to transmit CDMA physical signals to three sites.

As described above, the digital CDMA physical signal transmitted through the wired transmission line 710 is transmitted to each slave digital repeater 720. The slave digital repeater 720 decompresses the received digital CDMA physical signal through signal demodulation and converts the received digital CDMA physical signal into a CDMA physical signal. Thereafter, the CDMA physical signal is converted into a baseband CDMA physical signal suitable for the physical signal processor 730 and transmitted to the physical signal processor 730.

The physical signal processor 730 converts the signal received from the slave digital repeater 720 into an RF signal that can be transmitted over the air through analog conversion and up converting. The converted RF signal is amplified by the power to be serviced over the air through the amplifier 240 and transmitted to the site to be serviced. On the other hand, in the reverse link, the reverse order is performed.

Hereinafter, detailed structures and operations of the master digital repeater 700 and the slave digital repeater 720 in the above-described second embodiment will be described with reference to FIGS. 8 and 9.

8 is a block diagram showing the detailed structure of the master digital repeater 700 in the second embodiment of the present invention.

Referring to FIG. 8, the master digital repeater 700 may be configured to include a digital signal processor 800a to 800n. The digital signal processor 800 may be configured as a single module, and the number of modules is determined according to the number of sites to be serviced. In FIG. 8, n modules are illustrated.

The digital signal processor 800 converts the baseband digital CDMA physical signal transmitted from the baseband processing part of the BTS 100 into a form of data suitable for transmission through a wired transmission line 710. For example, when the transmission format of the wired transmission line 710 requires a format such as serial / parallel / T1 / E1 / Ethernet / ATM, the data format of the wired transmission line 710 may be adjusted. Play a role.

Although not shown in the drawing, the master digital repeater 700 may be implemented to be in charge of monitoring and controlling the states of the master digital repeater 700 and the slave digital repeater 720 by including a control unit. In this case, the controller transmits and reports the information of the master digital repeater 700 and the slave digital repeater 720 through communication with the EMS server. In addition, the controller collects the state / control information of the slave digital repeater 720 and transmits it to the EMS server. In addition, when the master digital repeater 700 is interlocked with the base band of the BTS 100 as in the above-described second embodiment without interlocking with the master optical repeater 110 as in the first embodiment, The correct control will be performed.

9 is a block diagram showing the detailed structure of the slave digital repeater 720 in the second embodiment of the present invention.

Referring to FIG. 9, the slave digital repeater 720 may be configured to include a digital signal processor 900. The digital signal processor 900 may be configured as a module and installed at each site to be serviced.

In the case of the forward link, the digital signal processor 900 converts the digital CDMA signal received through the wired transmission line 710 into data suitable for the physical signal processor 730. For example, when the transmission format of the wired transmission line 710 requires a format such as serial / parallel / T1 / E1 / Ethernet / ATM, the data format thereof is received. A baseband CDMA physical signal suitable for the physical signal processor 730 is changed.

Meanwhile, although not shown in the drawing, the slave digital repeater 720 may include a control unit to implement the state monitoring and control of the slave digital repeater 720. In this case, the controller of the slave digital repeater 720 transmits control information to the EMS server through communication with the controller of the master digital repeater 700. In addition, when the master digital repeater 700 is not interlocked with the master optical repeater 110 as in the first embodiment but in conjunction with the baseband of the BTS 100 as in the second embodiment described above, The correct control will be performed.

Hereinafter, detailed operations of the master digital repeater 700 and the slave digital repeater 720 according to the present invention described above with reference to FIGS. 8 and 9 will be described. For convenience of explanation, it is assumed that only three sites are supported.

First, as described above, the master digital repeater 700 transmits a baseband digital CDMA physical signal transmitted from the baseband of the BTS 100 to a data format suitable for transmission of the wired transmission line 710 by the digital signal processor 800. After converting to a signal of the, and transmits to the slave digital repeater 720 via the wired transmission line 710. Here, the master digital repeater 700 operates three modules to transmit CDMA physical signals to three sites.

On the other hand, the digital CDMA physical signal transmitted through the wired transmission line 710 is transmitted to the slave digital repeater 720 of each site, the digital signal processor 900 of the slave digital repeater 720 is a physical signal processor ( Data suitable for 730, i.e., a baseband CDMA physical signal, is converted, and the converted baseband CDMA physical signal is transferred to the physical signal processor 730.

The physical signal processor 730 converts an RF signal that can be transmitted over the air through analog conversion and up converting. The RF signal thus transmitted is amplified by the power to be serviced over the air through the amplifier 240 and transmitted to the site to be serviced. On the other hand, in the reverse link, the above procedure is performed in reverse.

Hereinafter, detailed structures of the digital signal processing units 800 and 900 which are commonly used in the master digital repeater 700 and the slave digital repeater 720 will be described in detail with reference to FIG. 10.

10 is a block diagram showing the detailed structure of the digital signal processing unit 800, 900 in the second embodiment of the present invention.

Referring to FIG. 10, the digital signal processing units 800 and 900 described above with reference to FIGS. 8 and 9 may include a transmission data processing unit 1000, a compression processing unit 1010, a reception data processing unit 1020, and the like.

First, the transmission data processing unit 1000 is a device that stores data of the transmission portion of the BTS 100 or the physical signal processing unit 730. That is, the transmission data processing unit 1000 is a device for storing the digital CDMA physical signal transmitted from the BTS 100 or the physical signal processor 730 in a memory such as a FIFO / RAM, and the compression processing unit 1010 is compressed. It is a device that stores data while processing data. Also, the apparatus converts the digital CDMA physical signal decompressed by the compression processor 1010 into a data format suitable for the input format of the BTS 100 or the physical signal processor 730.

The compression processor 1010 generally processes data in units of 8 bits, and in the present invention, it is preferable to process data in units of 16 bits. The compression processor 1010 compresses the digital CDMA physical signal transmitted from the transmission data processor 1000 in a predetermined unit (for example, in units of 1K bytes) and then compresses the digital CDMA physical signal in the received data processor 1020. It will transmit data. In addition, the compression processing unit 1010 transmits a signal pattern for synchronization while the data is not transmitted.

In addition, the compression processor 1010 releases the compressed information of the compressed data transmitted from the received data processor 1020 and transmits the compressed information to the transmission data processor 1000. In this case, the general CDMA data has a compression ratio of about 70% as a 2's complement or offset binary code having a random characteristic. Therefore, in the present invention, by compressing and transmitting the CDMA data through the compression processing unit 1010 as described above, it is possible to transmit more data than the data rate (data rate) that can be actually transmitted, maximizing the use efficiency of the channel (Channel) It has the advantage of being able to.

The reception data processor 1020 is a device having a function opposite to that of the transmission data processor 1000 (countpart function), and compresses data received from the BTS 100 or the physical signal processor 730. The apparatus converts the compressed data transmitted according to the transmission format according to the input format of the wired transmission line 710. As described above, the transmission data format of the wired transmission line 710 may have a signal format such as T1, T3, E1, E3, Ethernet, ATM, parallel, serial, or the like. The reception data processor 1020 converts the data into a data format suitable for the transmission and transmits the data to the wired transmission line 710.

In addition, the compressed data received through the wired transmission line 710 as a receiver function of the received data processing unit 1020, T1, T3, E1, E3, Ethernet, ATM, Parallel (Parallel), Serial (Serial) And the like, and convert the data into 16 bits of data suitable for processing by the compression processor 1010. In addition, after storing the data in a storage device such as a FIFO / RAM, when all the compressed files are stored, the data is transmitted to the compression processor 1010.

Meanwhile, according to the present invention, the digital signal processor 800, 900 includes a compression processor 1010, and compresses and transmits a transmission signal so as to have the same additional advantages as described above in the first embodiment. do.

On the other hand, as described above, each of the master digital repeater (300, 700) and slave digital repeater (310, 720) is provided with a control unit to operate in a form suitable for the system environment by selecting from two structures to operate. .

For example, the master digital repeater 300 includes a control unit, and by selectively controlling the input / output signals by the control unit, it is possible to implement the above-described first and second embodiments as a single device. More specifically, in the first embodiment, since the master digital repeater 300 is connected to the master optical repeater 110, the conversion process for the optical signal in the signal converter 400 should be performed. However, in the second embodiment, since the master digital repeater 700 is directly connected to the baseband part of the BTS 100, the function of the signal converter 400 is not necessary.

Therefore, when the master digital repeater (300, 700) is interlocked with the master optical repeater 110 according to the first embodiment by the control unit to control the input signal to the signal converter 400 On the other hand, when interworking with the baseband of the BTS 100 according to the second embodiment, it controls to input the input signal to the digital signal processing unit 800. This allows one master digital repeater 300, 700 to be adapted for two different systems.

In the same manner, the slave digital repeaters 310 and 720 may have the same effect by providing a control unit. That is, when the slave digital repeater (310, 720) is interlocked with the slave optical repeater 120 according to the first embodiment by the control unit to control to input the input signal to the signal converter 500 On the other hand, when interworking with the physical signal processor 730 according to the second embodiment, the input signal is controlled to be input to the digital signal processor 900. This allows one slave digital repeater 310, 720 to be adapted to two different systems.

On the other hand, the features of the present invention is different from the prior art as follows.

First, it can use the existing optical repeater and at the same time can act as an optical instrument without using an optical line. In addition, unlike conventional wireless repeaters (e.g., variable wave, RF, microwave repeater), the signal transmitted through the wired transmission line transmits a digitally modulated signal, so that the signal resilience is excellent and the signal characteristics similar to those of the optical repeater do.

In addition, when the new site is added, it is possible to have better signal characteristics than a conventional optical repeater or a wireless repeater by using only the present invention without installing an optical repeater or a wireless repeater separately. That is, in the case of the optical repeater, the conversion of the optical signal and the electrical signal and the line loss are applied to the signal. In the case of the wireless repeater, there is a signal loss occurring in the frequency modulation and the radio. The signal characteristics are the same as those of amplifying a conventional base station directly through an amplifier. This has the advantage of increasing the frequency efficiency and providing the same subscriber service even using less frequency than the conventional scheme.

In addition, the present invention has the advantage that can be implemented regardless of the distance (size) of the site to be serviced. For example, the use of digital wired communication allows data to be transmitted without signal loss of up to several tens of kilometers, and by controlling the size of the amplifier and the number of frequencies, it can be used for both large and small sites. On the other hand, as described above, when the control unit is provided, it is possible to perform different control when interworking with the optical repeater and when interworking with the baseband of the base station. Will have

On the other hand, in the embodiment of the present invention has been described with respect to specific embodiments, of course, various modifications are possible without departing from the scope of the invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the appended claims, but also by the equivalents of the claims.

According to the present invention, it is possible to reduce the optical line rental cost of the mobile communication operator and reduce the line installation cost and the like by reducing the expensive optical line rental cost. In addition, unlike conventional repeaters, the digital communication method is used, so the signal recovery ability is excellent and the signal characteristics (S / N ratio) are excellent, thereby maximizing frequency utilization. In addition, since one equipment can replace the existing optical repeater line and repeater equipment, it is possible to minimize the management and operation costs, and in the case of a manufacturer, it is possible to reduce the manufacturing cost and maximize the material management efficiency. do.

On the other hand, when interworking with the baseband of the base station, a signal loss is hardly generated by using digital communication to each site without using a conventional repeater. It has the advantage of being able to minimize the cost of purchase.

In addition, to maximize the efficiency of the use of the most important frequency in mobile communication, it is characterized by minimizing signal loss at long-distance sites, which has the advantage of accommodating service subscribers with the minimum use of frequency. do.

In addition, since the present invention transmits using digital wired communication, the structure can be used regardless of a long distance site or a short distance site, a large site, and a small site, thereby maximizing site utilization. have.

Claims (28)

In a relay system for transmitting a signal transmitted from a base station in a mobile communication system to a mobile terminal, A master optical repeater for converting a code division multiple access physical signal to be transmitted from the base station into an optical signal; A master digital repeater for receiving a code division multiple access physical signal converted into an optical signal from the master optical repeater and converting the code division multiple access physical signal into a digital code division multiple access physical signal; A wired transmission line for transmitting the digital code division multiple access physical signal; A slave digital repeater for converting and transmitting the digital code division multiple access physical signal transmitted through the wired transmission line into an optical signal; And And a slave optical repeater for converting an optical signal transmitted from the slave digital repeater into a code division multiple access physical signal and transmitting the converted signal wirelessly through an antenna. The method of claim 1, wherein the master digital repeater, A signal converter converting the optical signal received from the master optical repeater into a digital code division multiple access physical signal; And And a digital signal processor for digitally compressing the code division multiple access physical signal transmitted from the signal converter. The method of claim 1, wherein the slave digital repeater, A digital signal processing unit for receiving a digital code division multiple access physical signal from the base station through a wired transmission line and converting the digital code division multiple access physical signal into a data format suitable for signal conversion processing; And And a signal converter converting the digital code division multiple access physical signal received from the digital signal processor into an optical signal and transmitting the optical signal to a slave optical repeater. In the master relay device for transmitting a signal transmitted from a base station in a mobile communication system to a mobile terminal, A signal converter for converting an optical signal received from a master optical repeater linked with the base station into a digital code division multiple access physical signal; and And a digital signal processing unit for digitally compressing the code division multiple access physical signal transmitted from the signal conversion unit. The method of claim 4, wherein the device, And a control unit which controls the input signal from the base station to be directly input to the digital signal processor when the baseband signal of the base station is directly input. The method of claim 4, wherein the digital signal processing unit, A transmission data processor for storing the digital code division multiple access physical signal transmitted from the signal converter in a memory; A compression processor for compressing the digital code division multiple access physical signal transmitted from the transmission data processor in a predetermined unit; And And a reception data processing unit for converting the compressed data transmitted from the compression processing unit according to the input format of the wireless signal processing unit. The method of claim 6, wherein the output data format of the reception data processing unit, Master digital relay device, characterized in that any one selected from T1, T3, E1, E3, Ethernet, ATM, parallel and serial. A slave relay apparatus for relaying a signal transmitted from a mobile terminal to a base station in a mobile communication system, A digital signal processing unit for receiving a digital code division multiple access physical signal from the base station through a wired transmission line and converting the digital code division multiple access physical signal into a data format suitable for signal conversion processing; And And a signal converter converting the digital signal division multiple access physical signal into an optical signal and transmitting the converted signal to a slave optical repeater. The device of claim 8, wherein the device is And a controller for controlling a signal received from the mobile terminal to be directly input to the digital signal processor when receiving a signal obtained by physically processing a signal transmitted from the mobile terminal. . The method of claim 8, wherein the digital signal processing unit, A transmission data processor for storing the digital code division multiple access physical signal transmitted from the signal converter in a memory; A compression processor for compressing the digital code division multiple access physical signal transmitted from the transmission data processor in a predetermined unit; And And a receiving data processor converting the compressed data transmitted from the compression processor according to the input format of the radio signal processor. The method of claim 8, wherein the output data format of the reception data processing unit, Slave digital relay device, characterized in that any one selected from T1, T3, E1, E3, Ethernet, ATM, parallel and serial. In a relay method for transmitting a signal transmitted from a base station in a mobile communication system to a mobile terminal, Converting a code division multiple access physical signal to be transmitted from the base station into an optical signal; Receiving the code division multiple access physical signal converted into the optical signal, converting the digital signal division multiple access physical signal, and transmitting the converted signal through a wired transmission line; Receiving and converting the transmitted digital code division multiple access physical signal into an optical signal; And Converting the converted optical signal into a code division multiple access physical signal, and transmitting the converted signal to the mobile terminal through an antenna. The method of claim 12, wherein converting the wireless signal, A signal conversion step of converting the received optical signal into a digital code division multiple access physical signal; And And a digital signal processing step of compressing the converted code division multiple access physical signal. The method of claim 12, wherein the optical signal conversion step, A digital signal processing step of decompressing a signal received from the base station via a wired transmission line and converting the signal into a data form suitable for signal conversion processing; And And a signal conversion step of converting and converting the converted digital code division multiple access physical signal into an optical signal. 15. The method of claim 14, wherein in the digital signal processing step, And compressing the converted code division multiple access physical signal in a predetermined unit. In a relay system for transmitting a signal transmitted from a base station in a mobile communication system to a mobile terminal, A master digital repeater for compressing the baseband digital code division multiple access physical signal received from the base station and transmitting the compressed signal through a wired transmission line; A slave digital repeater for converting a digital code division multiple access signal transmitted from the master digital repeater into a baseband code division multiple access physical signal; And And a physical signal processor for converting a signal received from the slave digital repeater into a signal that can be transmitted over the air through analog conversion and up-converting. The system of claim 16, wherein the system is And an amplifier for amplifying the signal received from the physical signal processor by the power to be serviced over the air. The method of claim 16, wherein the master digital repeater, And a digital signal processor for compressing the baseband digital code division multiple access physical signal received from the base station. The method of claim 16, wherein the slave digital repeater, And a digital signal processor configured to receive a digital code division multiple access physical signal from the base station through a wired transmission line and convert the digital code division multiple access physical signal into a data format suitable for physical signal processing. In the master relay device for transmitting a signal transmitted from a base station in a mobile communication system to a mobile terminal, And a digital signal processor for compressing the baseband digital code division multiple access physical signal received from the base station. The method of claim 20, wherein the digital signal processing unit, A transmission data processor for storing a digital code division multiple access physical signal transmitted from the base station in a memory; A compression processor for compressing the digital code division multiple access physical signal transmitted from the transmission data processor in a predetermined unit; And And a reception data processing unit for converting the compressed data transmitted from the compression processing unit according to the transmission format of the wired transmission line. The output data format of claim 21, wherein Master digital relay device, characterized in that any one selected from T1, T3, E1, E3, Ethernet, ATM, parallel and serial. A slave relay apparatus for relaying a signal transmitted from a mobile terminal to a base station in a mobile communication system, And a digital signal processing unit for converting the digital code division multiple access physical signal received from the base station through a wired transmission line into a data format suitable for physical signal processing. The method of claim 23, wherein the digital signal processing unit, A transmission data processor for storing a digital code division multiple access physical signal transmitted from the physical signal processor in a memory; A compression processor for compressing the digital code division multiple access physical signal transmitted from the transmission data processor in a predetermined unit; And And a receiving data processor for converting the compressed data transmitted from the compression processor according to the transmission format of the wired transmission line. The output data format of claim 24, wherein Slave digital relay device, characterized in that any one selected from T1, T3, E1, E3, Ethernet, ATM, parallel and serial. In a relay method for transmitting a signal transmitted from a base station in a mobile communication system to a mobile terminal, Compressing the baseband digital code division multiple access physical signal received from the base station and transmitting the compressed signal over a wired transmission line; Receiving the transmitted digital code division multiple access physical signal and converting the baseband code division multiple access physical signal; And  And converting the converted signal into a signal that can be transmitted over the air through analog conversion and up-converting. 27. The method of claim 26, wherein the step of converting the signal into a digital communication enabled signal, And a digital signal processing step of compressing the baseband digital code division multiple access physical signal received from the base station. 27. The method of claim 26, wherein converting the digital signal into a baseband code division multiple access physical signal comprises: And a digital signal processing step of converting the digital code division multiple access physical signal received from the base station through a wired transmission line into a data state suitable for physical signal processing.

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