KR20060084755A - Mobile coumunication relay apparatus, relay system and method using the same - Google Patents

Abstract

The present invention relates to a mobile communication relay apparatus, a relay system, and a relay method using the same to increase the capacity of the relay station and improve the call quality by allowing only a specific signal of the signals of various base stations around the relay station to be received.

The mobile communication relay system according to the present invention includes a user's mobile communication terminal; A plurality of base stations for generating a pseudo noise signal to provide a mobile communication service to the mobile communication terminal; A pseudo noise signal for selecting a pseudo noise signal of a specific base station among the base stations and generating a pseudo noise signal identical to the selected pseudo noise signal to amplify and relay the pseudo noise signal from the base stations to the mobile communication terminal. A relay device having a selection and generation unit is provided, and the relay device amplifies the pseudo noise signals from the base stations and adds the pseudo noise signal generated by the pseudo noise signal selection and generation unit.

Description

Mobile communication relay device and relay system and relay method using same {Mobile Coumunication Relay Apparatus, Relay System And Method Using The Same}             

1 schematically illustrates a universal mobile communication system.

2 illustrates a cell of a mobile communication system.

3 is a diagram illustrating a conventional base station and repeater.

4 is a view showing an amplification process of a conventional repeater.

5 is a view showing a mobile communication relay device of the present invention.

FIG. 6 shows the PN selection / generation section 28 of FIG. 6 in more detail.

7 is a view showing a service providing method using a relay device of the present invention.

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

1: mobile communication terminal 3: base station

5: base station controller 7: mobile switching center

9: mobile communication service server 10: mobile communication system

11: circular cell 12: hexagonal cell

17: donor antenna 18: donor transceiver

13: first amplifying / filtering unit 14: second amplifying / filtering unit

15: service transceiver 16: service antenna

20: first antenna 21: first duplexer

22: first low noise amplifier 23: first frequency converter

24: first filter unit 25: second frequency converter

26: first amplifier 27: second amplifier

28: PN selecting / generating unit 29: adding unit

30: second antenna 31: second duplexer

32: second low noise amplifier 33: third frequency converter

34: 2nd filter part 35: 4th frequency converter

36: third amplifier 37: fourth amplifier

41: demodulation part 42: analog-to-digital converter

43: PN searcher 44: PN generator

45: digital-to-analog converter 46: modulator

47: frequency converter

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to mobile communications, and more particularly, to a mobile communication relay apparatus and a relay method using the same to increase capacity and call quality of a relay station by receiving only a specific signal among signals of various base stations around the relay station. .

Recently, the field of mobile communication has been innovated with the introduction of third generation mobile communication systems (3G) such as International Telecommunication 2000 (IMT2000), Universal Mobile Telecommunications System (UMTS) and Wide-Code Division Multiple Access (W-CDMA). I'm trying. The emergence of higher speed, higher capacity, and higher quality of the third generation (G3), following the digital second generation (G2), which is a departure from the conventional first generation (G1) analog handset method, is an opportunity to bring mobile communication and users closer together. It is becoming.

1 is a diagram schematically illustrating a universal mobile communication system.

Referring to FIG. 1, such a mobile communication system includes a mobile station (MS) 1 of a user, a base station (BS) 3 that wirelessly connects the mobile communication terminal and the mobile communication system. Base station controller (BSC) 5 for controlling a base station, a mobile switching center (MSC) 7 for controlling a base station controller, and a service system for providing a service and a call to a user by interworking with them (9) )

The service system 9 provides already provided Short Message Service (SMS), Multi Media Service (MMS), data communication, and interworking services with landline telephones.

The mobile communication system connects the user terminal (MS) and the system 10 by radio frequency (RF) of various areas. This radio frequency (RF) provides users with voice calls, data communications and various services.

To this end, as shown in FIG. 1, a base station 3 for receiving a signal from the terminal 1 and transmitting a signal from the system 10 is installed at an end of the system 10. In general, such a mobile communication system is called a cellular system because a range of a constant radius is formed by the reach of the signal transmitted from the base station 3, that is, the output of the base station 3. This area is commonly referred to as a cell, which appears to be circular in the ideal case, and is usually represented as a hexagonal area in the design of the system 10 for simplicity of design.

2 illustrates a cell of a mobile communication system.

As shown in FIG. 2, a circular cell 11 is formed under a situation in which interference in a planar region is excluded. The circular cell 11 formed by each base station 3 overlaps with the circular cell 11 of the neighboring base station 3, and the terminals 1 located in the overlapping part are received from both base stations. The base station 3 to communicate is selected based on the strength of the signal. When the part of the selection is ideal, since the line is a side of the overlapping line, that is, the hexagonal cell 12, the approximated cell, that is, the hexagonal cell 12 is mainly used in the design.

The shapes of the cells 11 and 12 may not be able to maintain the ideal circle 11 or hexagon 12 for various reasons. These reasons vary with terrain, buildings, number of terminals in the cell, and climate. For this reason, if the cell radius is distorted, a shaded area is created when there is no base station 3 to accommodate the distorted portion. The terminal 1 located in the shadowed area becomes incapable of providing a mobile communication service to the user.

In addition, in the case of a mobile communication provider, it is economically unreasonable to increase the number of base stations indefinitely, so that a shadow area is intentionally formed to install a base station in an appropriate place. Among the factors determining the cell radius, the number of resident terminals within the cell radius acts as a large factor, so that in the case of a city where the density of the terminal is relatively high, the cell radius is decreased to increase the number of base stations. On the other hand, in the case of secluded countryside, one cell radius reaches several times the city center.

If the density of the terminal is relatively low and there is room in the capacity of the neighboring base station 3 among the shadowed areas caused by this reason, a method of eliminating the shaded area by installing a repeater is used. That is, the signals from the neighbor base stations 3 are relayed to the terminal 1, and the signals from the terminal 1 are also relayed to the base station 3 to which the call is communicated. Through this, communication of the terminal 1 located in the shaded area is possible.

On the other hand, in order to start communication between the base station 3 and the terminal 1, various types of signals are exchanged in various stages. Among these various signals, the terminal 1 is used as a signal for identifying and selecting a neighboring base station 3, which is a pseudo noise code (PN code). One cell of the normal base station 3 is divided into three sectors and managed. For this purpose, one base station 3 is given a PN code suitable for this sector number. The PN code allows the base station 1 to distinguish the base stations by having different time zones for each base station 3. To this end, each base station or sector can be distinguished with an offset of 512 steps from 0 to 511, and used in a base station at a distance where radio waves of each base station 3 do not reach. Each offset has a length of 64 chips. Here, one chip has a time length of approximately 813 nanoseconds. As described above, the terminal 1 distinguishes between base stations by PN offsets having different time zones for each 64 chips, and among the base stations 3 which transmit different PN codes, the PN code determined to have a strong output, i. Will choose to communicate.

In the case of the aforementioned repeater, the PN code is also relayed so that the terminal 1 can select the base station 3 using the repeater.

3 is a diagram illustrating a conventional base station and repeater.

As shown in Fig. 3, the base stations 3a, 3b, and 3c transmit each unique PN code to the corresponding cell of each base station. A relay station (RS) amplifies and transmits PN codes of adjacent base stations 3a, 3b, and 3c to a shaded area. The terminal 1 selects one base station 3 in consideration of the strength of the output among the PN codes PN1 to PN3 transmitted from the relay RS. When the terminal 1 transmits a signal synchronized with the selected PN code, the relay RS transmits a signal from the terminal 1 to the base station 3 so that communication is performed.

4 illustrates amplification of a conventional repeater, in which a service antenna direction in a donor antenna amplifies a signal from a base station, and a donor antenna direction in a service antenna amplifies a signal from a terminal.

Referring to FIG. 4, the repeater RS includes a donor antenna 17, a donor transceiver 18, first and second amplification / filtering units 13 and 14, a service transceiver 15, and a service antenna 15. 16).

The donor antenna 17 receives signals from neighboring base stations 3 and provides them to the donor transceiver 18, and provides terminal-side signals from the donor transceiver 18 to the neighbor base stations 3. do.

The donor transceiver 18 receives a signal from a neighbor base station received through the donor antenna 17 and provides it to the first amplification / filtering unit 13 and the terminal side from the second amplification / filtering unit 13. The signal is provided to donor antenna 17. In addition, the donor transceiver 18 includes a filter unit for filtering out noise of the signal of the base station 3 received through the donor antenna 17.

The first amplification / filtering unit 13 amplifies the signal of the base station 3 from the donor transceiver 18 and provides it to the service transceiver 15. To this end, the first amplifier / filter unit 13 includes a low noise amplifier (LNA), a frequency converter, a SAW filter unit, an amplifier, and the like. The first amplifying / filtering unit 13 converts the received signal into a frequency of a low frequency band which is easy to process in order to amplify the base station side signal. In general, current mobile communication systems use frequencies in the hundreds of megahertz (MHz) to several gigahertz (GHz) bands, which is difficult to process as they are. This converts the frequency into a few tens of megahertz (MHz) band that is easy to filter and amplify. The converted base station signal is filtered by a filter such as a SAW filter, and is then provided to the service transceiver 15 through frequency conversion and amplification. This amplification and filtering is not just a one-time but repeated for multiple steps, resulting in efficient filtering and amplification.

The second amplifying / filtering portion 14 has a direction opposite to the first amplifying / filtering portion 14. That is, the first amplification / filtering unit 14 amplifies and filters the base station side signal and provides the service transmission / reception unit 15, while the second amplification / filtering unit 14 amplifies and filters the terminal side signal. The donor transceiver 18 is provided. To this end, the second amplifying / filtering unit 14 has a configuration similar to that of the first amplifying / filtering unit 14.

The service transceiver 15 transmits the signal amplified and filtered from the first amplification / filtering unit 13 to the shadow area through the service antenna 16, and the terminal-side signal from the terminal 1 in the shadow area. Is received and provided to the second amplification / filtering unit 14. To this end, the service transceiver 15 has a configuration similar to the donor transceiver 18.

In the conventional mobile communication relay system as described above, all signals received from neighboring base stations 3 are amplified and transmitted to the shaded area. Of course, since the strength of the signal of the base station 3 received by the repeater RS is different, the strength of the signal of the base station 3 transmitted to the shadow area after amplification has different magnitudes. However, the output of the signal transmitted from the same base station 3 also temporarily occurs. In this case, the terminal 1 in the shaded area determines this as a handoff (Hand_Off) time point and selects another base station 3, that is, another PN code. In addition, when the output of the previous base station 3 returns to normal again, the terminal 1 performs handoff again.

When such frequent handoff is made, there is a problem in that the efficiency of the system is very degraded because one terminal occupies channel capacity of a plurality of base stations.

Accordingly, an object of the present invention is to provide a mobile communication relay apparatus, a relay system, and a relay method using the same, which can increase the capacity of a relay station and improve call quality by allowing only a specific signal of signals of various base stations around the relay station to be received.

In order to achieve the above object, a mobile communication relay system includes a mobile communication terminal of a user; A plurality of base stations for generating a pseudo noise signal to provide a mobile communication service to the mobile communication terminal; A pseudo noise signal for selecting a pseudo noise signal of a specific base station among the base stations and generating a pseudo noise signal identical to the selected pseudo noise signal to amplify and relay the pseudo noise signal from the base stations to the mobile communication terminal. A relay device having a selection and generation unit is provided, and the relay device amplifies the pseudo noise signals from the base stations and adds the pseudo noise signal generated by the pseudo noise signal selection and generation unit.

The relay device includes a base station signal processing unit for amplifying and filtering a base station signal provided from the base stations to the mobile communication terminal, and a terminal signal for amplifying and filtering the terminal side signal provided from the mobile communication terminal to the base stations. It has a processing part.

The relay device includes a duplexer unit for forming a communication channel with any one of the base station and the mobile communication terminal, an amplifier unit for amplifying a signal received by the duplexer unit, and a filter unit for removing noise of the signal. do.

The pseudo noise signal selection and generation unit is provided in the base station signal processing unit.

The mobile communication relay apparatus according to the present invention receives a pseudo noise signal from a plurality of base stations for transmitting a base station signal for providing a mobile communication service to a user's mobile communication terminal, and amplifies the pseudo noise signal amplified and filtered. A duplexer unit for providing the mobile communication terminal; A filter unit for removing noise of the pseudo noise signal; A frequency converter for converting a frequency of the pseudo noise signal for filtering the pseudo noise signal; An amplifier for amplifying the pseudo noise signal; A pseudo noise signal selection and generation unit for selecting a pseudo noise signal of a specific base station among the base stations and generating a pseudo noise signal identical to the selected pseudo noise signal; And an adder for adding the amplified pseudo noise signal and the pseudo noise signal of the specific base station.

The duplexer receives a base station signal including the pseudo noise signal from the base stations and provides a terminal side signal from the mobile communication terminal to the base station, and the base station signal to the mobile communication terminal. And a second duplexer for receiving the terminal-side signal.

The amplifier includes first and second low noise amplifiers for low noise amplifying the signals from the duplexers, and first to fourth amplifiers for amplifying gain and output of the signals.

The frequency converter converts a frequency of the signals into an intermediate frequency band for noise reduction and provides a first frequency converter for providing the first filter unit, and converts the frequencies of the signals converted into an intermediate frequency band into an original radio frequency. And a second frequency converter for converting the band.

The pseudo noise signal selection and generation unit provides the pseudo noise signals from the first filter unit.

The adder is connected between the first amplifier, the second amplifier, and the pseudo noise signal selector and generator.

The pseudo noise signal selection and generation unit includes a demodulation unit for demodulating the pseudo noise signals, an analog-to-digital converter for digitalizing the demodulated pseudo noise signals, and a specific pseudo noise signal among the digitized pseudo noise signals. Selects and selects a PN searcher for generating the selected command of generating the specific pseudo noise signal; and a piene generator for generating the same pseudo noise signal as the specific pseudo noise signal by the generating command; And a digital-to-analog converter for analogizing the pseudo noise signal from the digital signal and a modulator for modulating the analogized pseudo noise signal.

A frequency converter for converting the frequency of the modulated pseudo noise signal to the frequency of the radio frequency band is further provided.

According to an aspect of the present invention, there is provided a mobile communication relay method comprising: receiving pseudo noise signals from a plurality of base stations transmitting base station signals for providing a mobile communication service to a user's mobile communication terminal; Removing noise of the pseudo noise signal; Converting a frequency of the pseudo noise signal to remove noise of the pseudo noise signal; Amplifying the pseudo noise signal; Selecting a pseudo noise signal of a specific base station among the base stations; Generating a pseudo noise signal identical to the selected pseudo noise signal; Adding the amplified pseudo noise signal and the pseudo noise signal of the specific base station.

Either of the frequency conversion step and the pseudo noise selection step further includes demodulating the pseudo signals and digitizing the demodulated pseudo noise signals.

Any one of the frequency conversion step and the pseudo noise selection step may include selecting a specific pseudo noise signal among the pseudo noise signals, and generating a generation command for generating a pseudo noise signal identical to the selected pseudo noise signal. It further comprises a step.

The generating of the pseudo noise signal further includes generating the pseudo noise signal in response to the generation command, digitizing the generated pseudo noise signal, and modulating the digitized pseudo noise signal. do.

Any one of generating and adding the pseudonoise signal further includes converting a frequency of the modulated pseudonoise signal.

Other features and operations of the present invention other than the above object will become apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 5 to 7.

5 is a diagram illustrating a mobile communication relay apparatus of the present invention.

Referring to FIG. 5, a mobile communication relay device includes first and second duplexers 21 and 31, first and second low noise amplifiers 22 and 32, and first to fourth frequency converters 23, 25, and 33. 35, first and second filter units 24 and 34, first to fourth amplifiers 26, 27, 36 and 37, adder 29 and PN selector / generator 28 do.

The first duplexer 21 forms a communication channel with the base stations 3 located near the relay, and receives a signal from the base stations 3 so as to receive a first low noise amplifier (hereinafter referred to as "LNA"). , 22). In addition, the amplified terminal side signal provided from the fourth amplifier 37 is provided to the base station 3 in which the communication channel is formed. To this end, the first duplexer 21 further includes a transmitter, a receiver for forming a communication channel with the base station 3, and a filter for removing noise generated in a signal during transmission and reception with the antenna.

The second duplexer 31 forms a communication channel with the terminal 91 in the service area, i.e., the shadow area, and provides the terminal-side signal from the terminal 1 to the second LNA. In addition, the amplified base station signal from the second amplifying unit 27 and the selected and amplified specific PN signal are provided to the terminal 1 using the formed communication channel. To this end, the second duplexer 31 includes a transmitter, a receiver, an antenna, and a filter for removing noise, for forming a communication channel with the terminal 1.

The first and second LNAs 22 and 32 amplify the base station or the terminal-side signals provided from the first and second duplexes 21 and 31 so as to amplify the first frequency converter 23 and the third frequency converter 33. To each). The power of the signal received from the base station 3 or the terminal 1 through the duplexes 21 and 31 has a very low power level due to the effects of attenuation and noise. Therefore, the LNAs 22 and 32 minimize noise and amplify the signals to the first and third frequency converters 23 and 33 so that the signals from the base station 3 or the terminal 1 can be easily processed. to provide.

The first frequency converter 23 converts the base station signal from the first LNA 22 into a frequency of an intermediate frequency (IF) band that is easy to filter and amplify. In detail, the frequency range used in the mobile communication system is a frequency of several hundred megahertz (MHz) to several hundred hertz (GHz) band, and the first frequency converter 23 can easily filter the tens of megahertz (MHz). Convert to the middle frequency of the band.

The first filter unit 24 receives the base station signal of the intermediate frequency from the first frequency converter 23, removes noise added to the signal, and selects the second frequency converter 25 and the PN. The generator 28 is provided. To this end, the first filter unit 24 includes a narrow band filter such as a SAW filter to accurately select a frequency of a desired signal with a narrow bandwidth.

The second frequency converter 25 converts the base station signal of the intermediate frequency band from which the noise signal is attenuated by the first filter unit 24 to a radio frequency band (RF) signal used in mobile communication. .

The first amplifier 26 amplifies the base station signal from the second frequency converter 25 to the shadow area primarily. To this end, the first amplifier 26 includes a drive amplifier (DA) or a driving amplifier (DRA) and pairs with the second amplifier 27 to amplify the base station signal. The driving amplifier of the first amplifier 26 increases the gain of the filtered base station signal and provides it to the second amplifier 27.

The second amplifier 27 amplifies the base station signal having increased gain from the first amplifier 26 and the selected PN signal from the PN selector / generator 28 to provide it to the second duplexer 31. To this end, the second amplifier 27 includes a high power amplifier (HPA) for power amplification.

The third frequency converter 33 converts the frequency RF of the received terminal-side signal into a frequency of the intermediate frequency IF band, and provides it to the second filter unit 24.

The second filter unit 34 receives the base station signal of the intermediate frequency IF from the third frequency converter 33, removes noise added to the signal, and transmits the noise to the fourth frequency converter 35. to provide. To this end, the second filter unit 34 includes a narrow band filter such as a SAW filter to accurately select a frequency of a desired signal with a narrow bandwidth.

The fourth frequency converter 35 converts the terminal-side signal of the intermediate frequency (IF) band filtered by the second filter unit 34 into a radio frequency (RF) for transmitting to the base station.

The third and fourth amplifiers 36, 37 primarily amplify the signals from the terminal from the fourth frequency converter 35 to the base station. To this end, the third amplifying unit 36 includes a driving amplifier, and pairs with the fourth amplifying unit 37 to amplify the base station signal. The driving amplifier of the third amplifier 36 increases the gain of the filtered base station signal and provides it to the fourth amplifier 37.

The fourth amplifier 37 amplifies the terminal-side signal whose gain from the third amplifier 36 is increased and provides it to the first duplexer 21. To this end, the fourth amplifier 37 includes a large power amplifier for power amplification.

The adder 29 adds the base station signal from the first amplifier 26 and the specific PN signal from the PN selector / generator 28 to provide it to the second amplifier 27.

The PN selector / generator 28 selects a specific PN signal included in the base station signal and generates the same PN signal as the selected PN signal to provide to the adder 29. To this end, the PN selector 28 includes an analog-digital converter, a demodulator, a PN searcher, a PN generator, a digital-analog converter, and a modulator for converting a base station signal into a digital signal. That is, in the present invention, the PN searcher selects a specific PN signal among the PN signals transmitted by the base stations 3 every specific period. When a specific PN signal is selected, the PN searcher supplies a PN signal generation command to the PN generator to generate this PN signal. The PN signal generated by the PN generator is added to the base station signal that is primarily amplified by the amplified adder 29. The same PN signal included in the signal generated by the PN generator and the base station signal amplified by the first amplifier 26 is added to increase the strength of the PN signal selected from the base station signals amplified together. Subsequently, when the base station signal to which the specific PN signal is added by the second amplifier 27 is amplified and transmitted to the shadow area, the terminal 1 transmits this specific PN signal in response to the specific PN signal by the signal strength. The call is opened with one base station 3. As a result, the handoff rate with the base station transmitting another PN signal is significantly lowered, or the shadow area can be controlled by the designated base station.

Here, the first LNA 22, the first frequency converter 23, the first filter 24, the second frequency converter 25, the first amplifier 26, the PN selector generator 28 ), The adder 29 and the second amplifier 27 are a base station signal processor for amplifying a signal of the base station and providing the amplified signal to the mobile communication terminal. In addition, the second LNA 32, the third frequency converter 33, the second filter 34, the fourth frequency converter 35, the third amplifier 36 and the fourth amplifier 37 Is a terminal side signal processor which amplifies the terminal side signal and provides the terminal side signal. The base station signal processor amplifies and filters the PN signals transmitted from the base stations at specific periods and transmits the same to the shaded area. When the mobile communication terminal receives the PN signal and sends the response signal Ack, the signal processing unit of the repeater receives the signal.

FIG. 6 is a diagram illustrating the PN selection / generation unit 28 of FIG. 6 in more detail.

Referring to FIG. 6, the PN selector 28 according to the present invention includes a demodulator 41, an analog-digital converter 42, a PN searcher 43, a PN generator 44, and a digital-analog converter ( 45, a frequency converter 47 and a modulator 46.

The demodulator 41 demodulates the noise-free base station signal provided from the first filter unit 24 into an I / Q signal. This demodulator 41 provides the demodulated signal to the analog-to-digital converter 42.

The analog-to-digital converter (hereinafter, referred to as "ADC") 42 converts the demodulated base station signal provided from the demodulator 41 into a digital signal for processing and provides it to the PN searcher 43. . To this end, the ADC 42 has an I signal converter and a Q signal converter for converting each of the I and Q signals into digital signals.

The PN searcher 43 selects a specific PN signal from the digitized base station signals provided from the ADC 43 and provides a PN generation command to the PN generator 44 to generate the same PN signal as the selected PN signal. In order for the PN searcher 43 to select a specific PN signal, a strong PN signal is selected among the base station signals, or the operator selects and amplifies the PN signal of the same base station as the PN signal preset in the PN searcher 43. can do. When the PN signal having a strong strength is selected, the strength of the PN signals is measured at an average value or a time point for a predetermined time to select a signal having a large strength among the PN signals. In this case, the PN searcher 43 has a comparator for comparing the strengths of the PN signals. In addition, when amplifying the PN signal set by the operator, it is determined whether to receive a preset PN signal among base station signals, and when the set PN signal is input, the PN is generated in the PN generator 44 to generate the set PN signal. Supply the command.

The PN generator 44 generates the same signal as the PN signal selected by the PN searcher 43 according to the PN generation command from the PN searcher 43. In this case, the signal generated by the PN Zener 44 should have the same PN signal and six chips, that is, about 488 nanoseconds, in order to avoid collision or cancellation with other PN signals or the same amplified PN signal. Do. In addition, the PN signal generated by the PN generator 44 is generated as an I / Q signal and provided to the digital-to-analog converter 45 at the next stage.

A digital-analog converter (hereinafter referred to as "DAC") 45 converts a digital PN signal generated from the PN generator 44 into an analog signal. To this end, the DAC 45 includes an I signal DAC and a Q signal DAC for converting I and Q signals into analog signals. Here, the filter unit for removing the noise of the generated PN signal may be located between the PN generator 44 and the DAC 45, and the filter used is preferably a FIR filter (Finite Impulse Response Filter).

The modulator 46 modulates the PN signal converted from the DAC 45 into an analog signal into a signal that can be transmitted.

The frequency converter 47 converts the specific PN signal of the modulated intermediate frequency IF into a frequency of the original radio frequency (RF) band and supplies it to the adder 29.

7 is a view showing a service providing method using a relay device of the present invention.

Referring to FIG. 7, a repeater receives PN signals from neighboring base stations (S10).

The repeater converts the received PN signal into a frequency of an intermediate frequency (IF) band that is easy to filter and amplify. (S20) The PN signals converted to the intermediate frequency (IF) band are noise-reduced by a low noise filter or the like. S30)

The PN signals from which the noise is removed are converted back to the frequency of the radio frequency (RF) band used in the mobile communication (S41).

The PN signals converted to the frequencies of the radio frequency band are primarily amplified by the first amplifier (S42).

Meanwhile, the filtered PN signals are selected to select a specific PN signal together with the amplification step S41 and S42 (S51 to S55).

The filtered PN signals are demodulated into I / Q signals and converted into digital signals (S51).

The demodulated and digitally signaled PN signals are supplied to a PN searcher so that the PN searcher selects one of these PN signals. The PN searcher that selects one of the PN signals provides a PN signal generation command to the PN generation unit so as to generate the same PN signal as the selected PN signal (S52). Here, the PN searcher is a PN signal preset by the operator or a received PN. The PN generator is controlled to generate a strong PN signal among the signals. When only the set PN signal is generated, the PN searcher determines whether the same PN signal as the set PN signal is received among the received PN signals, and generates a set PN signal when the PN signal is received. Provide generation command. Alternatively, the PN signal may be determined by measuring the instantaneous intensity or the intensity during a certain period of the PN signals to determine the PN signal having the strongest PN signal, and controlling the PN generator to generate the PN signal having the strongest PN signal. It is possible.

The PN generation unit generates a specific PN signal having a predetermined delay time by the generation command from the PN searcher (S53).

The PN signal generated from the PN generator is subjected to analogization and modulation processes (S54).

The modulated PN signal is converted into a frequency of the radio frequency band (S55).

The specific PN signal converted to the frequency of the radio frequency band and the PN signals amplified in steps S41 and S42 are combined by an adder (S60).

Combined PN signals are sent to the shadowed area (S70).

In more detail this method, the PN signals are continuously transmitted at predetermined time intervals from the base stations. Signals received by the repeater among the PN signals are amplified without signal division through frequency conversion (S20), filtering (S30), frequency change (S41), and amplification (S42). In order to prevent the terminal located in the shadow area from occupying the capacity of the neighboring base station by the signals amplified without distinction, the present invention includes the step of selecting and generating a specific PN signal in the step after filtering (S30). . By this step, the conventional analog signal is not only filtered and amplified. As shown in FIG. 7, the PN signal is selected by demodulation and digitization. The reason for demodulating and digitizing the PN signal is that the PN signals received as analog signals go through only a frequency conversion and amplification step, so that the signal received by the repeater does not know exactly what the signal is. It demodulates and digitizes the signal to separate the PN signals to select a specific PN signal.

The same PN signal as that of the selected specific PN signal is generated by the PN generator, which is then subjected to analogization and modulation. After the modulation process, the PN signal is combined with the signal amplified first in step S42 through frequency conversion. That is, by supplying a specific PN signal to the amplified PN signals once more, the strength of a specific PN signal is made larger than that of other PN signals so that the terminal responds to the specific PN signal.

When responding to a specific PN signal as described above, only the capacity of the base station that transmits the corresponding PN signal is occupied, thereby reducing the incidence of handoff. According to the method and the apparatus in the present invention, the signal of the feature base station becomes relatively larger than the signal of the other base station, so that the terminal of the repeater service area can use only the resources of the specific base station. This has the effect of increasing the base station capacity, it is possible to improve the call quality by increasing the base station capacity.

As described above, the relay device, the relay system and the relay method using the same according to the present invention selects any one of the PN signals of the neighboring base station by the relay device and generates the same PN signal to combine with the amplified signals An apparatus and method are provided. Accordingly, the relay device, the relay system and the relay method using the same of the present invention can amplify a specific PN signal. In addition, the relay device of the present invention, the relay system and the relay method using the same by amplifying a specific PN signal, thereby preventing frequent handoff of the terminal in the shadow area and thereby occupying the base station capacity, thereby increasing base station capacity and improving call quality. It is possible to contribute to.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (17)

A mobile communication terminal of a user; A plurality of base stations for generating a pseudo noise signal to provide a mobile communication service to the mobile communication terminal; A pseudo noise signal for selecting a pseudo noise signal of a specific base station among the base stations and generating a pseudo noise signal identical to the selected pseudo noise signal to amplify and relay the pseudo noise signal from the base stations to the mobile communication terminal. A repeater having a selection and generating section, And the relay device amplifies the pseudo noise signals from the base stations and adds the pseudo noise signals to a specific pseudo noise signal generated by the pseudo noise signal selection and generation unit. The method of claim 1, The relay device A base station signal processor for amplifying and filtering base station signals provided from the base stations to the mobile communication terminal; And a terminal signal processing unit for amplifying and filtering terminal-side signals provided from the mobile communication terminal to the base stations. The method of claim 2, The relay device A duplexer unit for forming a communication channel with any one of the base station and the mobile communication terminal; An amplifier for amplifying the signal received by the duplexer; And a filter unit for removing noise of the signal. The method of claim 3, wherein The pseudo-noise signal selection and generation unit is provided in the base station signal processing unit. Duplexer unit for receiving a pseudo noise signal from a plurality of base stations for transmitting a base station signal for providing a mobile communication service to a user's mobile communication terminal, and providing the amplified and filtered pseudo noise signal to the mobile communication terminal Wow; A filter unit for removing noise of the pseudo noise signal; A frequency converter for converting a frequency of the pseudo noise signal for filtering the pseudo noise signal; An amplifier for amplifying the pseudo noise signal; A pseudo noise signal selection and generation unit for selecting a pseudo noise signal of a specific base station among the base stations and generating a pseudo noise signal identical to the selected pseudo noise signal; And an adder for adding the amplified pseudo noise signal and the pseudo noise signal of the specific base station. The method of claim 5, wherein The duplexer A first duplexer for receiving a base station signal including the pseudo noise signal from the base stations and providing a terminal side signal from the mobile communication terminal to the base station; And a second duplexer for providing the base station signal to the mobile communication terminal and receiving the terminal side signal. The method of claim 6, The amplification unit First and second low noise amplifiers for low noise amplifying the signals from the duplexers; And first to fourth amplifiers for amplifying gains and outputs of the signals. The method of claim 6, The frequency converter A first frequency converter for converting a frequency of the signals into an intermediate frequency band to remove noise and providing the first filter to the first filter; And a second frequency converter for converting the frequency of the signals converted into the intermediate frequency band into the original radio frequency band. The method of claim 8, The pseudo noise signal selection and generation unit And the pseudo noise signals are provided from the first filter unit. The method of claim 9, The addition unit And the first amplifying unit, the second amplifying unit, and the pseudo noise signal selecting and generating unit are connected to each other. The method of claim 9, The pseudo noise signal selection and generation unit A demodulator for demodulating the pseudo noise signals; An analog-to-digital converter for digitalizing the demodulated pseudonoise signals; A PN searcher for selecting a specific pseudo noise signal among the digitized pseudo noise signals and generating an instruction for generating the selected specific pseudo noise signal; A pien generator for generating a pseudo noise signal identical to the specific pseudo noise signal by the generation command; A digital-analog converter for analogizing the pseudo noise signal from the piene generating unit; And a modulator for modulating the analogized pseudo noise signal. The method of claim 11, And a frequency converter for converting a frequency of the modulated pseudo noise signal into a frequency of a radio frequency band. Receiving a pseudo noise signal from a plurality of base stations which transmit a base station signal for providing a mobile communication service to a user's mobile communication terminal; Removing noise of the pseudo noise signal; Converting a frequency of the pseudo noise signal to remove noise of the pseudo noise signal; Amplifying the pseudo noise signal; Selecting a pseudo noise signal of a specific base station among the base stations; Generating a pseudo noise signal identical to the selected pseudo noise signal; And adding the amplified pseudo noise signal and the pseudo noise signal of the specific base station. The method of claim 13, Any one of the frequency conversion step and the pseudo noise selection step Demodulating the pseudo signals; And digitizing the demodulated pseudo noise signals. The method of claim 14, Any one of the frequency conversion step and the pseudo noise selection step Selecting a specific pseudo noise signal among the pseudo noise signals; And generating a generation command for generating a pseudo noise signal identical to the selected pseudo noise signal. The method of claim 15, Generating the pseudo noise signal Generating the pseudo noise signal in response to the generation command; Digitizing the generated pseudo noise signal; And modulating the digitized pseudo-noise signal. The method of claim 15, Wherein the generating and adding of the pseudo noise signal further comprises converting a frequency of the modulated pseudo noise signal.

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