WO2002071648A1 - Sytem of mobile communication for in-building using frequence transfer method - Google Patents

Sytem of mobile communication for in-building using frequence transfer method Download PDF

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Publication number
WO2002071648A1
WO2002071648A1 PCT/KR2001/000591 KR0100591W WO02071648A1 WO 2002071648 A1 WO2002071648 A1 WO 2002071648A1 KR 0100591 W KR0100591 W KR 0100591W WO 02071648 A1 WO02071648 A1 WO 02071648A1
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WO
WIPO (PCT)
Prior art keywords
signal
power
control unit
antenna
variable attenuator
Prior art date
Application number
PCT/KR2001/000591
Other languages
French (fr)
Korean (ko)
Inventor
In-Cheol Bae
Original Assignee
In-Cheol Bae
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by In-Cheol Bae filed Critical In-Cheol Bae
Publication of WO2002071648A1 publication Critical patent/WO2002071648A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
    • H04B7/15535—Control of relay amplifier gain
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15507—Relay station based processing for cell extension or control of coverage area
    • H04B7/15514—Relay station based processing for cell extension or control of coverage area for shadowing compensation

Definitions

  • the present invention relates generally to an in-building mobile communication repeater, and more particularly to a mobile communication system, that is capable of eliminating shadow areas in buildings using a mobile communication repeater.
  • a mobile communication system includes a base station transceiver and a base station controller.
  • a base station and a mobile station communicate with each other at a constant frequency band, and such a base station has a constant communication radius. Accordingly, a plurality of base stations are appropriately arranged to overlap communication radiuses, so an area of a mobile communication service is expanded.
  • FIG. 1 is a block diagram showing a donor module of a conventional in- building repeater.
  • the conventional repeater is described with a Code Division Multiple Access (CDMA) mobile communication system taken as an example.
  • CDMA Code Division Multiple Access
  • FIG. 1 is a block diagram showing the donor module of the conventional in-building repeater.
  • the repeater servers to control power.
  • a donor module 1000 is comprised of a microcomputer 1500 for performing power control, a duplexer 1100 for enabling two-way communication between a base station and the donor module, a low noise amplifier 1210 for amplifying a high frequency band signal received through the duplexer 1100, a mixer 1220 for converting a high frequency band signal into an intermediate frequency band signal, a SAW filter 1230 for filtering an output signal of the mixer 1220 to obtain a desired intermediate frequency band signal from the output signal of the mixer 1220, a variable attenuator 1240 for power controlling an output signal of the SAW filter 1230 in response to a control signal of the microcomputer 1500, a power amplifier 1250 for power amplifying an output signal of the variable attenuator 1240, an FSK modulator 1900 for outputting a FSK signal, a variable attenuator 1310 for carrying out power control in response to a control signal of the microcomputer 1500, an amplifier 1320 for amplifying an output signal of the variable attenuator 1310,
  • FIG. 2 is a block diagram of a conventional remote module. One of the remote modules is described. The construction and operation of the remote modules are the same. A maximum of sixty remote modules are connected to one another as occasion demands.
  • the remote module is comprised of a microcomputer 1500 for performing power control, a duplexer 2040 for enabling two-way communication with the donor module, a SAW filter 2011 for passing a desired intermediate frequency band signal of an intermediate frequency band signal inputted through the duplexer 2040, a variable attenuator 2012 for power controlling an output signal of the SAW filter 2011 according to a control signal of the microcomputer 1500, an amplifier 2013 for amplifying an output signal of the variable attenuator 2012, a mixer 2014 for converting an output signal of the amplifier 2013 into a high frequency band signal, a SAW filter 2015 for carrying out filtering to obtain a desired high frequency signal from an output signal of the mixer 2014, a power amplifier 2016 for power amplifying an output signal of the SAW filter 2015, a low pass filter 2021 for low-pass filtering an output signal of the duplexer 2040, an amplifier 2022 for amplifying an output signal of the low pass filter 2021, a level detection and FSK demodulation unit 2023 for detecting a
  • a signal of a high frequency band that is, 1.8 to 1.9 MHz, is transmitted to the duplexer 1400 from the base station 200 in a wire or wireless manner.
  • the signal received through the duplexer 1100 is amplified by the low noise amplifier 1210, and then the amplified signal is converted into an intermediate frequency band signal at the mixer 1220.
  • the SAW filter 1230 passes a desired intermediate frequency band signal of the converted signal therethrough, but cuts off the other frequency band signal.
  • the microcomputer 1500 power controls an output signal of the SAW filter 1230 through the variable attenuator 1240.
  • an output signal of the variable attenuator 1240 is power amplified by the power amplifier 1250 and is outputted to the adder 1340.
  • the FSK modulator 1900 outputs a FSK signal.
  • the FSK modulator 1900 directly receives a signal of a 10 MHz oscillator when the donor module is linked to the base station 200.
  • variable attenuator 1310 power controls and outputs the FSK signal in response to a control signal of the microcomputer 1500.
  • the power controlled FSK signal is amplified by the amplifier 1320, and then only a low frequency band signal of the amplified signal is outputted to the adder 1340 through the low pass filter 1330.
  • the low frequency band signal outputted from the low pass filter 1330 is generated at a certain preset level to be power controlled.
  • the adder 1340 adds the output signal of the low pass filter
  • the duplexer 1400 transmits the output signal of the adder 1340 to the remote module 2000 in a building through the RG cable.
  • the RG cable is replaced by a coaxial line or Cable Television (CATV) cable as occasion demands.
  • CATV Cable Television
  • An intermediate frequency band signal transmitted through the RG cable is received by the duplexer 2040 of the remote module 2000.
  • the signal received by the duplexer 2040 is low pass filtered by the low pass filter 2021, the low pass filtered signal is amplified by the amplifier 2022, a reception level of an output signal of the amplifier 2022 is detected by the FSK demodulation at the level detection and FSK demodulation unit 2023, and the detected reception level is transmitted to the microcomputer 2060.
  • the microcomputer 2060 determines by how much the reception level has been decreased and carries out power control. Thereafter, the variable attenuator 2012 power controls an output signal of the SAW filter 2011 so as to compensate for a decrease in the reception level in response to a control signal of the microcomputer 2060.
  • an output signal of the variable attenuator 2012 is amplified by the amplifier 1013, and then is converted into a high frequency band signal by the mixer 2014. Thereafter, the SAW filter 2015 carries out filtering to obtain a desired high frequency signal from an output signal of the mixer 2014.
  • the power amplifier 2016 power amplifies an output signal of the SAW filter 2015 and outputs the amplified signal to the duplexer 2050.
  • the duplexer 2050 transmits an output signal of the power amplifier 2016 to a user's mobile phone through the antenna 2051. Accordingly, a shadow area in a building can be eliminated.
  • a signal transmitted from mobile phone is received by the duplexer 2050 through the antenna 2051, the inputted signal is amplified by the low noise amplifier 2037, and then the amplified signal is converted into an intermediate frequency band signal.
  • the SAW filter 2035 passes only a desired intermediate frequency band signal of a signal outputted from the mixer 2036 therethrough.
  • the mixer 2033 FSK modulates an output signal of the SAW filter 2035 according to the control of the microcomputer 1500 and outputs the modulated signal.
  • variable attenuator 2032 power controls an output signal of the mixer 2033 in response to a control signal of the microcomputer 1500.
  • a power controlled output signal of the variable attenuator 2032 is amplified by the power amplifier 2031 and is outputted into the duplexer 2040. Thereafter, the duplexer 2040 transmits an output signal of the power amplifier 2031 to the donor module through the RG cable.
  • the duplexer 1400 of the donor module receives an intermediate frequency band signal through the RG cable and outputs the signal into a receiver
  • the tone detection and FSK modulation unit 1700 detects a tone from the intermediate frequency band signal received by the duplexer 1400 and FSK demodulates the intermediate frequency band signal, and transmits a demodulated signal to the microcomputer 1500.
  • the SAW filter 1610 of the receiver 1600 passes a desired intermediate frequency band signal of an intermediate frequency band signal inputted into the duplexer 1400, and the low noise amplifier 1620 amplifies an output signal of the SAW filter 1620.
  • the mixer 1690 loads a state control signal onto an output signal of the low noise amplifier 1620 according to the control of the microcomputer 1500.
  • the variable attenuator 1630 power controls an output signal of the mixer 1690 according to the control of the microcomputer 1500 and outputs the controlled signal.
  • the microcomputer 1500 carries out power control according to a tone signal, that is, a state control signal detected by the tone detection and FSK demodulation unit 1700.
  • the mixer 1640 modulates an output signal of the variable attenuator 1630 into a high frequency band signal.
  • the SAW filter 1650 carries out filtering to obtain a desired high frequency band signal from an output signal of the mixer 1640.
  • the high frequency band signal is amplified by the power amplifier 1680 and the amplified signal is transmitted to the base station through the duplexer
  • a shadow area can be eliminated by connecting the mobile phone and the base station during the process.
  • the conventional repeater described above is problematic in that reverse direction output setting should be performed manually when a plurality of remote modules are installed, increased and removed, the continuous optimization maintenance of a reverse direction cell radius, a communication quality and a communication capacity should be carried out manually because a power control method using a data transfer format through simple tone and FSK modem manners is used to solve common problems residing in all the repeaters having 1 :N connection, and IMT-2000 repeaters needing a large amount of data capacity and a precise tsit nrror Kate (iibK) require many tecnnical supplements oecause an S modem manner of transmitting data by shifting a center tone frequency is employed.
  • an object of the present invention is to provide an in-building mobile communication repeating system using frequency conversion, which is capable of performing smooth repeating between a base station and a mobile station located in a building to improve the quality of communication, and eliminating a shadow area in a building at low cost.
  • the present invention provides an in-building mobile communication repeating system using frequency conversion, comprising: a base station for transmitting and receiving a certain service frequency signal (a PCS signal or an IMT-2000 signal); a donor module for decreasingly converting a forward frequency signal received from the base station or a variety of repeaters into an IF signal and transmitting the IF frequency signal to the antenna module through a CATV cable, and increasingly converting a reverse IF signal received from the antenna module to a RF signal and linking the RF signal to the base station or repeaters; a transmission unit for applying a DC voltage of +3 ON to a combiner to apply power to the antenna modules and transmitting the converted IF signal and a two-way OOK modem frequency signal together through a cable; a plurality of diplexers for receiving the forward IF signal, the OOK modem signal and the DC voltage of DC +30N with the forward IF frequency signal applied to an RF unit, the OOK modem signal applied to a reception power control unit (OOK
  • the donor module comprises the transmission unit for decreasingly converting the forward RF signal (the PCS or IMT-2000 signal) received from the base station or various repeaters into the IF signal, amplifying the IF signal and outputting the amplified IF signal; a four-way coupler for receiving the IF signal received through a CATV cable; a reception unit for increasingly converting the reverse IF signal received from the four-way coupler into the RF signal and linking the RF signal to the station or various repeaters; and a microcomputer control unit for detecting a bite tone level inputted from all the antenna modules to the reception unit and remotely controlling the antenna modules using the power control unit (the OOK modem) for controlling power through a forward pilot tone, and receiving alarm data from the antenna modules and transmitting an alarm signal to the base station or mobile phone.
  • the power control unit the OOK modem
  • the transmission unit comprises a low noise amplifier for amplifying the forward RF signal (the PCS or IMT-2000 signal) received from the base station (BTS) or repeaters; a first variable attenuator for controlling the gain of the forward RF signal, which is passed through the lower noise amplifier, by a control signal of the control unit; a mixer for converting an output signal of the first variable attenuator into an IF signal; an LC band pass filter for filtering an output signal of the mixer to obtain a desired IF signal; a power amplifier for amplifying the IF signal passed through the LC band pass filter; a second variable attenuator for detecting the level of the IF signal passed through the power amplifier and controlling a gain by an external microcomputer control signal; a power amplifier for power amplifying an output signal of the second variable attenuator; a level detector for transmitting a center tone frequency signal to the power control unit (the OOK modem); a third variable attenuator for controlling power in response to a control message of the power control unit;
  • the reception unit comprises a low noise amplifier for amplifying the reverse IF signal received by the four-way coupler; a LC band pass filter for passing a desired IF signal of the IF signal passed through the low noise amplifier; a power control unit (an OOK modem) for detecting a bite tone level outputted from all antenna modules and passed through the LC band pass filter and controlling power through a forward pilot tone; a power amplifier for amplifying the IF signal passed through the LC band pass filter; a fourth variable attenuator for power controlling the IF signal level passed through the power amplifier in response to a control message from the power control unit; a mixer for modulating an output signal of the fourth variable attenuator into an RF signal (a PCS signal or an IMT-2000 signal); a power amplifier for power amplifying an output signal of the mixer; and a band pass filter for passing a desired RF signal of the RF signal outputted from the power amplifier; wherein the output signal passed through the band pass filter is linked to the base station or repeaters.
  • the antenna modules each comprise a diplexer for enabling two-way communication with the donor module; a transmission unit for increasingly converting an IF signal inputted from the diplexer into an RF signal (a PCS signal or an IMT-2000 signal) and irradiating the RF signal through a patch antenna or an omnidirectional antenna; a power control unit (an OOK modem) for applying the RF signal to the reception power control unit (the reception OOK modem) through the diplexer; a duplexer for transmitting a signal of the transmission unit to an external shadow area and receiving an RF signal (a PCS signal or an IMT-2000 signal) transmitted from the mobile phone; a reception unit for decreasingly converting an RF signal (a PCS signal or an IMT-2000) into an IF signal and transmitting the IF signal together with an OOK signal into the diplexer; a Dual
  • DIP Inline Package
  • ID unique IDentification
  • microcomputer control unit for detecting a signal level of each of the antennas and transmitting detected information to the donor module through the power control unit (the OOK modem).
  • FIG. 1 is a block diagram showing a donor module of a conventional in- building repeating system
  • FIG. 2 is a block diagram showing an antenna module of the conventional in-building repeating system
  • FIG. 3 is a block diagram of a mobile communication system in accordance with a first embodiment of the present invention.
  • FIG. 4 is a block diagram showing power control of the mobile communication system in accordance with a second embodiment of the present invention.
  • FIG. 5 is a block diagram showing a donor module of the present invention.
  • FIG. 6 is a block diagram of an antenna module
  • FIG. 7 is a view showing an example to which the first and second embodiments are applied.
  • FIG. 3 is a block diagram of a mobile communication system in accordance with a first embodiment of the present invention.
  • FIG. 4 is a block diagram illustrating the power control of the mobile communication system in accordance with a second embodiment of the present invention.
  • the mobile communication system of the present invention is generally comprised of a base station 200, a donor module 3000, a plurality of diplexers 5000, and a plurality of antenna modules 6000.
  • the base station 200 transmits and receives a certain service frequency signal (a Personal Communication Service (PCS) signal or an International Mobile Telecommunication (IMT)-2000 signal).
  • PCS Personal Communication Service
  • IMT International Mobile Telecommunication
  • the donor module 3000 increasingly converts a reverse IF signal received from the antenna module 6000 to a Radio Frequency (RF) signal, and links the RF signal to the base station 200 or various repeaters 300.
  • IF Intermediate Frequency
  • RF Radio Frequency
  • a transmission unit 4000 applies a Direct Current (DC) voltage of +30V to a combiner to apply power to the antenna modules 6000 and transmits the converted IF signal and a two-way On/Off Keying (OOK) modem frequency signal together through a cable.
  • the diplexers each receive the forward IF signal, the OOK modem signal and the DC voltage of DC +30V, with the forward IF frequency signal applied to an RF unit, the OOK modem signal applied to a reception power control unit (OOK modem), and the DC voltage applied to the RF unit and a P through a power unit of an antenna module 6000.
  • Each of the antenna modules 6000 increasingly converts the received forward IF signal into a higher frequency signal and outputs the higher frequency signal to a mobile phone located in a shadow area through a patch antenna or an omnidirectional antenna, and decreasingly converts the reverse RF signal received from the mobile terminal into an IF signal and outputs the IF signal together with the OOK modem signal to the donor module 3000.
  • FIG. 5 is a block diagram of the donor module.
  • the donor module 3000 is comprised of the transmission unit 3100 that decreasingly converts the forward RF signal (the PCS or IMT-2000 signal) received from the base station 200 or various repeaters 300 into the IF signal, amplifies the IF signal and outputs the amplified IF signal, a four-way coupler 3200 that receives the IF signal received through a CATV cable, a reception unit
  • a microcomputer control unit 3400 that detects a bite tone level inputted from all the antenna modules to the reception unit 3300 and remotely controls the antenna modules using the power control unit (the OOK modem) for controlling power through a forward pilot tone, and receives alarm data from the antenna modules and transmits an alarm signal to the base station or mobile phone.
  • the power control unit the OOK modem
  • the transmission unit 3100 is comprised of a low noise amplifier 3301 that amplifies the forward RF signal (the PCS signal or the IMT-2000 signal) received from the base station (BTS) 200 or repeaters 300, a first variable attenuator 3102 that controls the gain of the forward RF signal, which is passed through the lower noise amplifier 3301, by a control signal of the control unit 3400, a mixer 3103 that converts an output signal of the first variable attenuator 3102 into an IF signal, a LC band pass filter 3104 that filters an output signal of the mixer 3103 to obtain a desired IF signal, a power amplifier 3105 that amplifies the IF signal passed through the LC band pass filter 3104, a second variable attenuator 3106 that detects the level of the IF signal passed through the power amplifier 3105 and controls a gain by an external microcomputer control signal, a power amplifier 3107 that power amplifies an output signal of the second variable attenuator 3106, a level detector 3108 that transmits a center
  • the reception unit 3300 is comprised of a low noise amplifier 3301 that amplifies the reverse IF signal received by the four- way coupler 3200, a LC band pass filter 3302 that passes a desired IF signal of the IF signal passed through the low noise amplifier 3301, a power control unit (an OOK modem) 3303 that detects a bite tone level outputted from all antenna modules and passed through the LC band pass filter 3302 and controls power through a forward pilot tone, a power amplifier 3304 that amplifies the IF signal passed through the LC band pass filter 3302, a fourth variable attenuator 3305 that power controls the IF signal level passed through the power amplifier 3304 in response to a control message of the power control unit 3303, a mixer 3306 that modulates an output signal of the fourth variable attenuator 3305 into an RF signal (a PCS signal or an IMT-2000 signal), a power amplifier 2207 that power amplifies an output signal of the mixer
  • band pass filter 3308 that passes a desired RF signal of the RF signal outputted from the power amplifier 3307, wherein the output signal passed through the band pass filter 3308 is linked to the base station 200 or repeaters 300.
  • FIG. 6 is a block diagram of an antenna module.
  • the antenna modules 6000 are each comprised of a diplexer 6100 that enables two-way communication with the donor module 3000, a transmission unit 6200 that increasingly converts an IF signal inputted from the diplexer 6100 into an RF signal (a PCS signal or an IMT-2000 signal) and transmits the RF signal through a patch antenna or an omnidirectional antenna, a power control unit (an OOK modem) 6300 that applies the RF signal to the reception power control unit
  • a diplexer 6100 that enables two-way communication with the donor module 3000
  • a transmission unit 6200 that increasingly converts an IF signal inputted from the diplexer 6100 into an RF signal (a PCS signal or an IMT-2000 signal) and transmits the RF signal through a patch antenna or an omnidirectional antenna
  • a power control unit (an OOK modem) 6300 that applies the RF signal to the reception power control unit
  • the reception OOK modem through the diplexer 6100
  • a duplexer 6600 that transmits a signal of the transmission unit 6200 to an external shadow area and receives an RF signal (a PCS signal or an IMT-2000 signal) transmitted from the mobile phone
  • a reception unit 6400 that decreasingly converts an RF signal (a PCS signal or an IMT-2000) into an IF signal and transmits the IF signal together with an OOK signal into the diplexer 6100
  • a Dual Inline Package (DIP) switch 6500 that assigns an unique IDentification (ID) to each of the antenna modules 6000 so that each of the antenna modules 6000 is monitored and controlled by a monitoring unit of the donor module even though several or several tens of antennas 6000 are installed
  • a microcomputer control unit 6700 that detects a signal level of each of the antennas 6000 and transmits detected information to the donor module 3000 through the power control unit (the OOK modem) 6500.
  • FIG. 7 is a view showing an example to which the first and second embodiments are applied. The operation of the example is described in detail hereinafter.
  • the donor module 3000 decreasingly converts a forward frequency signal received from the base station 200 or various repeaters 300 into an IF signal and transmits the IF frequency signal to the antenna module 6000 through the CATV cable, and increasingly converts a reverse IF signal received from the antenna modules 6000 to an RF signal and links the RF signal to the base station 200 or repeaters 300.
  • a PCS signal or an IMT-2000 signal a PCS signal or an IMT-2000 signal
  • the transmission unit 3100 of the donor module 3000 decreasingly converts the forward .
  • RF signal (the PCS or IMT-2000 signal) received from the base station 200 or various repeaters 300 into the IF signal, amplifies the IF signal and outputs the amplified IF signal, and the four-way coupler 3200 receives the IF signal received through a CATV cable.
  • the low noise amplifier 3301 amplifies the forward RF signal (the PCS or IMT-2000 signal) received from the base station (BTS) 200 or repeaters 300
  • the first variable attenuator 3102 controls the gain of the forward RF signal, which is passed through the lower noise amplifier 3301, by a control signal of the control unit 3400
  • the mixer 3103 converts an output signal of the first variable attenuator 3102 into an IF signal.
  • the LC band pass filter 3104 filters an output signal of the mixer 3103 to obtain a desired IF signal
  • the power amplifier 3105 amplifies the IF signal passed through the LC band pass filter 3104
  • the second variable attenuator 3106 detects the level of the IF signal passed through the power amplifier 3105 and controls a gain by an external microcomputer control signal.
  • the power amplifier 3107 power amplifies an output signal of the second variable attenuator 3106
  • the level detector 3108 transmits a center tone frequency signal to the power control unit (the OOK modem) 3111
  • the third variable attenuator 3109 controls power in response to a control message of the power control unit 3111.
  • the power amplifier 3110 power amplifies an output signal of the third variable attenuator 3111 and transmits the amplified signal to the four- way coupler 3200 as a reference signal. Thereafter, the reception unit 3300 increasingly converts the reverse IF signal received from the four-way coupler into the RF signal and links the RF signal to the station 200 or various repeaters 300.
  • the low noise amplifier 3301 amplifies the reverse IF signal received by the four-way coupler 3200
  • the LC band pass filter 3302 passes a desired IF signal of the IF signal passed through the low noise amplifier 3301
  • the power control unit (an OOK modem) 3303 detects a bite tone level outputted from all antenna modules and passed through the LC band pass filter 3302 and controls power through a forward pilot tone.
  • the power amplifier 3304 amplifies the IF signal passed through the LC band pass filter 3302, the fourth variable attenuator 3305 power controls the IF signal level passed through the power amplifier 3304 in response to a control message of the power control unit 3303, and the mixer 3306 modulates an output signal of the fourth variable attenuator 3305 into an RF signal (a PCS signal or an IMT-2000 signal).
  • the power amplifier 2207 power amplifies an output signal of the mixer 3306, and the band pass filter 3308 passes a desired RF signal of the RF signal outputted from the power amplifier 3307, thereby linking the output signal passed through the band pass filter 3308 to the base station 200 or repeaters 300.
  • the microcomputer control unit 3400 detects a bite tone level inputted from all the antenna modules to the reception unit 3300 and remotely controls the antenna modules using the power control unit (the OOK modem) for controlling power through a forward pilot tone, and receives alarm data from the antenna modules and transmits an alarm signal to the base station or mobile phone.
  • the power control unit the OOK modem
  • the transmission unit 4000 applies a voltage of +30V to a combiner to apply power to the antenna modules 6000 and transmits the converted IF signal and a two-way OOK modem frequency signal together through a cable.
  • the diplexers each receive the forward IF signal, the OOK modem signal and the DC voltage of DC +30V, with the forward IF frequency signal applied to an RF unit, the OOK modem signal applied to a reception power control unit (OOK modem), and the DC voltage applied to the RF unit and a P through a power unit of an antenna module 6000.
  • Each of the antenna modules 6000 increasingly converts the received forward IF signal into a higher frequency signal and outputs the higher frequency signal to a mobile phone located in a shadow area through a patch antenna or an omnidirectional antenna, and decreasingly converts the reverse RF signal received from the mobile terminal into an IF signal and outputs the IF signal together with the OOK modem signal to the donor module 3000.
  • the diplexer 6100 enables two-way communication with the donor module 3000, and the transmission unit 6200 increasingly converts an IF signal inputted from the diplexer 6100 into an RF signal (a PCS signal or an IMT-2000 signal) and transmits the RF signal through a patch antenna or an omnidirectional antenna.
  • an IF signal inputted from the diplexer 6100 into an RF signal (a PCS signal or an IMT-2000 signal) and transmits the RF signal through a patch antenna or an omnidirectional antenna.
  • the power control unit (an OOK modem) 6300 applies the RF signal to the reception power control unit (the reception OOK modem) through the diplexer
  • the duplexer 6600 transmits a signal of the transmission unit 6200 to an external shadow area and receives an RF signal (a PCS signal or an IMT-2000 signal) transmitted from the mobile phone.
  • the reception unit 6400 decreasingly converts an RF signal (a PCS signal or an IMT-2000) into an IF signal and transmits the IF signal together with an OOK signal into the diplexer 6100.
  • the Dual Inline Package (DIP) switch 6500 assigns a unique IDentification (ID) to each of the antenna modules 6000 so that each of the antenna modules 6000 is monitored and controlled by a monitoring unit of the donor module even though several or several tens of antennas 6000 are installed.
  • ID unique IDentification
  • the microcomputer control unit 6700 detects a signal level of each of the antennas 6000 and transmits detected information to the donor module 3000 through the power control unit (the OOK modem) 6500.
  • the present invention provides an in-building mobile communication repeating system, in which reverse direction output setting need not be performed manually when a plurality of remote modules are installed, increased and removed, and a reverse direction cell radius, a communication quality and a communication capacity are continuously optimized by a power control method using a data transfer format through a tone automatic control function and an OOK modem. Accordingly, repeating can be carried out smoothly between a base station and a mobile station located in a building, so the quality of communications is considerably improved and shadow areas can be eliminated at low cost.

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  • Mobile Radio Communication Systems (AREA)

Abstract

Disclosed herein is an in-building mobile communication repeating system using frequency conversion. The in-building mobile communication repeating system includes a base station (200) for transmitting and receiving a certain service frequency signal, a donor module for decreasingly converting a forward frequency signal and increasingly converting a reverse IF signal, a transmission unit (4000) for applying a Direct Current (DC) voltage of +30V to a combiner, a plurality of diplexers for receiving the forward IF signal, the OOK moden signal and the DC voltage of DC +30V, and a plurality of antenna modules (6000) for increasingly converting the received forward IF signal and decreasingly converting the reverse RF signal.

Description

SYSTEM OF MOBILE COMMUNICATION FOR IN-BUILDING USING FREQUENCE TRANSFER METHOD
Technical Field
The present invention relates generally to an in-building mobile communication repeater, and more particularly to a mobile communication system, that is capable of eliminating shadow areas in buildings using a mobile communication repeater.
Background Art
In general, a mobile communication system includes a base station transceiver and a base station controller.
A base station and a mobile station communicate with each other at a constant frequency band, and such a base station has a constant communication radius. Accordingly, a plurality of base stations are appropriately arranged to overlap communication radiuses, so an area of a mobile communication service is expanded.
However, although an entire city is covered by a plurality of base stations, there exist shadow areas in which mobile communication service is not provided in the underground spaces of large-sized buildings and the interiors of high-rise buildings. Accordingly, there is a problem in that smooth mobile communication services are not provided to mobile phone users in the shadow areas due to the existence of the shadow areas.
Hitherto, in order to overcome the problem caused by the shadow areas, there are employed a radio frequency repeater that is installed in a shadow area so as to eliminate the shadow area and an optical dispersion antenna that converts a radio frequency signal into an optical signal and transmits the optical signal to the shadow area of a building. However, the repeater using an optical cable and an optical dispersion antenna is disadvantageous in that excessively high cost is required to install the repeater. Accordingly, an in-building repeater system using a coaxial cable has been developed to eliminate a shadow area in a building, which is shown in FIG. 1. FIG. 1 is a block diagram showing a donor module of a conventional in- building repeater. Hereinafter, the conventional repeater is described with a Code Division Multiple Access (CDMA) mobile communication system taken as an example.
FIG. 1 is a block diagram showing the donor module of the conventional in-building repeater. In this case, the repeater servers to control power.
As shown in the drawing, a donor module 1000 is comprised of a microcomputer 1500 for performing power control, a duplexer 1100 for enabling two-way communication between a base station and the donor module, a low noise amplifier 1210 for amplifying a high frequency band signal received through the duplexer 1100, a mixer 1220 for converting a high frequency band signal into an intermediate frequency band signal, a SAW filter 1230 for filtering an output signal of the mixer 1220 to obtain a desired intermediate frequency band signal from the output signal of the mixer 1220, a variable attenuator 1240 for power controlling an output signal of the SAW filter 1230 in response to a control signal of the microcomputer 1500, a power amplifier 1250 for power amplifying an output signal of the variable attenuator 1240, an FSK modulator 1900 for outputting a FSK signal, a variable attenuator 1310 for carrying out power control in response to a control signal of the microcomputer 1500, an amplifier 1320 for amplifying an output signal of the variable attenuator 1310, a low pass filter 1330 for low-pass filtering an output signal of the amplifier 1320, an adder 1340 for adding an output signal of the low pass filter 1330 and an output signal of the power amplifier 1250 and outputting the sum of the output signals, a duplexer 1400 for transmitting an output signal of the adder 1340 to a RG cable and receiving an intermediate frequency band signal inputted from the RG cable, a tone detection and FSK modulation unit 1700 for detecting a tone signal from an intermediate frequency band signal outputted from the duplexer 1400, FSK demodulating the intermediate frequency band signal and transmitting the demodulated signal to microcomputer 1500, a SAW filter 1610 for passing a desired frequency band signal of an intermediate frequency band output signal of the tone detection unit and FSK modulator 1700 therethrough, a low noise amplifier 1620 for amplifying an output signal of the SAW filter 1610, a mixer
1690 for loading a state control signal onto an output signal of the low noise amplifier 1620 according to the control of the microcomputer 1500, a variable attenuator 1630 for power control an output signal of the mixer 1690 according to the control of the microcomputer 1500, a mixer 1640 for modulating an output signal of the variable attenuator 1630 into a high frequency band signal, a SAW filter 1650 for passing a desired high frequency band signal of an output signal of the mixer 1640 therethrough, and a power amplifier 1680 for power amplifying an output signal of the SAW filter 1650 and outputting the amplified signal to the duplexer 1100. FIG. 2 is a block diagram of a conventional remote module. One of the remote modules is described. The construction and operation of the remote modules are the same. A maximum of sixty remote modules are connected to one another as occasion demands.
As shown in the drawing, the remote module is comprised of a microcomputer 1500 for performing power control, a duplexer 2040 for enabling two-way communication with the donor module, a SAW filter 2011 for passing a desired intermediate frequency band signal of an intermediate frequency band signal inputted through the duplexer 2040, a variable attenuator 2012 for power controlling an output signal of the SAW filter 2011 according to a control signal of the microcomputer 1500, an amplifier 2013 for amplifying an output signal of the variable attenuator 2012, a mixer 2014 for converting an output signal of the amplifier 2013 into a high frequency band signal, a SAW filter 2015 for carrying out filtering to obtain a desired high frequency signal from an output signal of the mixer 2014, a power amplifier 2016 for power amplifying an output signal of the SAW filter 2015, a low pass filter 2021 for low-pass filtering an output signal of the duplexer 2040, an amplifier 2022 for amplifying an output signal of the low pass filter 2021, a level detection and FSK demodulation unit 2023 for detecting a level from an output signal of the amplifier 2022, FSK demodulating the output signal and transmitting the detected the level of the output signal to the microcomputer 2060, a duplexer 2050 for transmitting an output signal of the power amplifier 2016 to a user's mobile phone through the antenna 2051 and receiving a signal inputted from a mobile phone, a low noise amplifier 2037 for amplifying a signal received by the duplexer 2050, a mixer 2036 for converting an output signal of the low noise amplifier 2037 into an intermediate frequency band signal, a SAW filter 2035 for passing a desired frequency band signal of an output signal of the mixer 2036 therethrough, a mixer 2033 for FSK modulating a state control signal of the microcomputer 1500 and loading it onto an output signal of the SAW filter 2035, a variable attenuator 2032 for power controlling an output signal of the mixer 2033 according to the control of the microcomputer 1500, and a power amplifier 2031 for power amplifying an output signal of the variable attenuator 2032 and outputting the amplified signal to the duplexer 2040.
The operation of the donor module and remote module having the above- described constructions is described in detail hereinafter.
First, a signal of a high frequency band, that is, 1.8 to 1.9 MHz, is transmitted to the duplexer 1400 from the base station 200 in a wire or wireless manner.
The signal received through the duplexer 1100 is amplified by the low noise amplifier 1210, and then the amplified signal is converted into an intermediate frequency band signal at the mixer 1220.
Thereafter, the SAW filter 1230 passes a desired intermediate frequency band signal of the converted signal therethrough, but cuts off the other frequency band signal.
Then, the microcomputer 1500 power controls an output signal of the SAW filter 1230 through the variable attenuator 1240.
Thereafter, an output signal of the variable attenuator 1240 is power amplified by the power amplifier 1250 and is outputted to the adder 1340.
In the meantime, the FSK modulator 1900 outputs a FSK signal. In this case, the FSK modulator 1900 directly receives a signal of a 10 MHz oscillator when the donor module is linked to the base station 200.
Thereafter, the variable attenuator 1310 power controls and outputs the FSK signal in response to a control signal of the microcomputer 1500. The power controlled FSK signal is amplified by the amplifier 1320, and then only a low frequency band signal of the amplified signal is outputted to the adder 1340 through the low pass filter 1330. In this case, the low frequency band signal outputted from the low pass filter 1330 is generated at a certain preset level to be power controlled. Thereafter, the adder 1340 adds the output signal of the low pass filter
1330 and the output signal of the power amplifier 1250 and outputs the sum of the output signals to the duplexer 1400.
Then, the duplexer 1400 transmits the output signal of the adder 1340 to the remote module 2000 in a building through the RG cable. In this case, the RG cable is replaced by a coaxial line or Cable Television (CATV) cable as occasion demands.
An intermediate frequency band signal transmitted through the RG cable is received by the duplexer 2040 of the remote module 2000.
Thereafter, only a desired intermediate frequency band signal of the intermediate frequency band signal inputted through the duplexer 2040 is passed through the SAW filter 2011.
Meanwhile, the signal received by the duplexer 2040 is low pass filtered by the low pass filter 2021, the low pass filtered signal is amplified by the amplifier 2022, a reception level of an output signal of the amplifier 2022 is detected by the FSK demodulation at the level detection and FSK demodulation unit 2023, and the detected reception level is transmitted to the microcomputer 2060.
Then, the microcomputer 2060 determines by how much the reception level has been decreased and carries out power control. Thereafter, the variable attenuator 2012 power controls an output signal of the SAW filter 2011 so as to compensate for a decrease in the reception level in response to a control signal of the microcomputer 2060.
Thereafter, an output signal of the variable attenuator 2012 is amplified by the amplifier 1013, and then is converted into a high frequency band signal by the mixer 2014. Thereafter, the SAW filter 2015 carries out filtering to obtain a desired high frequency signal from an output signal of the mixer 2014.
Thereafter, the power amplifier 2016 power amplifies an output signal of the SAW filter 2015 and outputs the amplified signal to the duplexer 2050.
Then, the duplexer 2050 transmits an output signal of the power amplifier 2016 to a user's mobile phone through the antenna 2051. Accordingly, a shadow area in a building can be eliminated.
In the meantime, a signal transmitted from mobile phone is received by the duplexer 2050 through the antenna 2051, the inputted signal is amplified by the low noise amplifier 2037, and then the amplified signal is converted into an intermediate frequency band signal.
Thereafter, the SAW filter 2035 passes only a desired intermediate frequency band signal of a signal outputted from the mixer 2036 therethrough.
Thereafter, the mixer 2033 FSK modulates an output signal of the SAW filter 2035 according to the control of the microcomputer 1500 and outputs the modulated signal.
Then, the variable attenuator 2032 power controls an output signal of the mixer 2033 in response to a control signal of the microcomputer 1500.
A power controlled output signal of the variable attenuator 2032 is amplified by the power amplifier 2031 and is outputted into the duplexer 2040. Thereafter, the duplexer 2040 transmits an output signal of the power amplifier 2031 to the donor module through the RG cable.
Then, the duplexer 1400 of the donor module receives an intermediate frequency band signal through the RG cable and outputs the signal into a receiver
1600 and a tone detection and FSK demodulation unit 1700. Thereafter, the tone detection and FSK modulation unit 1700 detects a tone from the intermediate frequency band signal received by the duplexer 1400 and FSK demodulates the intermediate frequency band signal, and transmits a demodulated signal to the microcomputer 1500.
In the meantime, the SAW filter 1610 of the receiver 1600 passes a desired intermediate frequency band signal of an intermediate frequency band signal inputted into the duplexer 1400, and the low noise amplifier 1620 amplifies an output signal of the SAW filter 1620.
Thereafter, the mixer 1690 loads a state control signal onto an output signal of the low noise amplifier 1620 according to the control of the microcomputer 1500. Thereafter, the variable attenuator 1630 power controls an output signal of the mixer 1690 according to the control of the microcomputer 1500 and outputs the controlled signal. In this case, the microcomputer 1500 carries out power control according to a tone signal, that is, a state control signal detected by the tone detection and FSK demodulation unit 1700. Thereafter, the mixer 1640 modulates an output signal of the variable attenuator 1630 into a high frequency band signal. The SAW filter 1650 carries out filtering to obtain a desired high frequency band signal from an output signal of the mixer 1640.
The high frequency band signal is amplified by the power amplifier 1680 and the amplified signal is transmitted to the base station through the duplexer
1100 in a wire or wireless manner.
As described above, a shadow area can be eliminated by connecting the mobile phone and the base station during the process.
However, the conventional repeater described above is problematic in that reverse direction output setting should be performed manually when a plurality of remote modules are installed, increased and removed, the continuous optimization maintenance of a reverse direction cell radius, a communication quality and a communication capacity should be carried out manually because a power control method using a data transfer format through simple tone and FSK modem manners is used to solve common problems residing in all the repeaters having 1 :N connection, and IMT-2000 repeaters needing a large amount of data capacity and a precise tsit nrror Kate (iibK) require many tecnnical supplements oecause an S modem manner of transmitting data by shifting a center tone frequency is employed.
Disclosure of the Invention
Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide an in-building mobile communication repeating system using frequency conversion, which is capable of performing smooth repeating between a base station and a mobile station located in a building to improve the quality of communication, and eliminating a shadow area in a building at low cost.
In order to accomplish the above object, the present invention provides an in-building mobile communication repeating system using frequency conversion, comprising: a base station for transmitting and receiving a certain service frequency signal (a PCS signal or an IMT-2000 signal); a donor module for decreasingly converting a forward frequency signal received from the base station or a variety of repeaters into an IF signal and transmitting the IF frequency signal to the antenna module through a CATV cable, and increasingly converting a reverse IF signal received from the antenna module to a RF signal and linking the RF signal to the base station or repeaters; a transmission unit for applying a DC voltage of +3 ON to a combiner to apply power to the antenna modules and transmitting the converted IF signal and a two-way OOK modem frequency signal together through a cable; a plurality of diplexers for receiving the forward IF signal, the OOK modem signal and the DC voltage of DC +30N with the forward IF frequency signal applied to an RF unit, the OOK modem signal applied to a reception power control unit (OOK modem), and the DC voltage applied to the RF unit and a P through a power unit of an antenna module; and a plurality of antenna modules for increasingly converting the received forward IF signal into a higher frequency signal and outputting the higher frequency signal to a mobile phone located in a shadow area through a patch antenna or an omnidirectional antenna, and decreasingly converting the reverse RF signal received from the mobile terminal into an IF signal and outputting the IF signal together with the OOK modem signal to the donor module.
The donor module comprises the transmission unit for decreasingly converting the forward RF signal (the PCS or IMT-2000 signal) received from the base station or various repeaters into the IF signal, amplifying the IF signal and outputting the amplified IF signal; a four-way coupler for receiving the IF signal received through a CATV cable; a reception unit for increasingly converting the reverse IF signal received from the four-way coupler into the RF signal and linking the RF signal to the station or various repeaters; and a microcomputer control unit for detecting a bite tone level inputted from all the antenna modules to the reception unit and remotely controlling the antenna modules using the power control unit (the OOK modem) for controlling power through a forward pilot tone, and receiving alarm data from the antenna modules and transmitting an alarm signal to the base station or mobile phone.
The transmission unit comprises a low noise amplifier for amplifying the forward RF signal (the PCS or IMT-2000 signal) received from the base station (BTS) or repeaters; a first variable attenuator for controlling the gain of the forward RF signal, which is passed through the lower noise amplifier, by a control signal of the control unit; a mixer for converting an output signal of the first variable attenuator into an IF signal; an LC band pass filter for filtering an output signal of the mixer to obtain a desired IF signal; a power amplifier for amplifying the IF signal passed through the LC band pass filter; a second variable attenuator for detecting the level of the IF signal passed through the power amplifier and controlling a gain by an external microcomputer control signal; a power amplifier for power amplifying an output signal of the second variable attenuator; a level detector for transmitting a center tone frequency signal to the power control unit (the OOK modem); a third variable attenuator for controlling power in response to a control message of the power control unit; and a power amplifier for power amplifying an output signal of the third variable attenuator and transmitting the amplified signal to the four-way coupler as a reference signal. The reception unit comprises a low noise amplifier for amplifying the reverse IF signal received by the four-way coupler; a LC band pass filter for passing a desired IF signal of the IF signal passed through the low noise amplifier; a power control unit (an OOK modem) for detecting a bite tone level outputted from all antenna modules and passed through the LC band pass filter and controlling power through a forward pilot tone; a power amplifier for amplifying the IF signal passed through the LC band pass filter; a fourth variable attenuator for power controlling the IF signal level passed through the power amplifier in response to a control message from the power control unit; a mixer for modulating an output signal of the fourth variable attenuator into an RF signal (a PCS signal or an IMT-2000 signal); a power amplifier for power amplifying an output signal of the mixer; and a band pass filter for passing a desired RF signal of the RF signal outputted from the power amplifier; wherein the output signal passed through the band pass filter is linked to the base station or repeaters. The antenna modules each comprise a diplexer for enabling two-way communication with the donor module; a transmission unit for increasingly converting an IF signal inputted from the diplexer into an RF signal (a PCS signal or an IMT-2000 signal) and irradiating the RF signal through a patch antenna or an omnidirectional antenna; a power control unit (an OOK modem) for applying the RF signal to the reception power control unit (the reception OOK modem) through the diplexer; a duplexer for transmitting a signal of the transmission unit to an external shadow area and receiving an RF signal (a PCS signal or an IMT-2000 signal) transmitted from the mobile phone; a reception unit for decreasingly converting an RF signal (a PCS signal or an IMT-2000) into an IF signal and transmitting the IF signal together with an OOK signal into the diplexer; a Dual
Inline Package (DIP) switch for assigning an unique IDentification (ID) to each of the antenna modules so that each of the antenna modules is monitored and controlled by a monitoring unit of the donor module even though several or several tens of antennas are installed; and a microcomputer control unit for detecting a signal level of each of the antennas and transmitting detected information to the donor module through the power control unit (the OOK modem). Brief Description of the Drawings
The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in that: FIG. 1 is a block diagram showing a donor module of a conventional in- building repeating system;
FIG. 2 is a block diagram showing an antenna module of the conventional in-building repeating system;
FIG. 3 is a block diagram of a mobile communication system in accordance with a first embodiment of the present invention;
FIG. 4 is a block diagram showing power control of the mobile communication system in accordance with a second embodiment of the present invention;
FIG. 5 is a block diagram showing a donor module of the present invention;
FIG. 6 is a block diagram of an antenna module; and
FIG. 7 is a view showing an example to which the first and second embodiments are applied.
Best Mode for Carrying Out the Invention
Hereinafter, a preferred embodiment of the present invention is described with the accompanying drawings.
FIG. 3 is a block diagram of a mobile communication system in accordance with a first embodiment of the present invention. FIG. 4 is a block diagram illustrating the power control of the mobile communication system in accordance with a second embodiment of the present invention.
As shown in the drawings, the mobile communication system of the present invention is generally comprised of a base station 200, a donor module 3000, a plurality of diplexers 5000, and a plurality of antenna modules 6000.
The base station 200 transmits and receives a certain service frequency signal (a Personal Communication Service (PCS) signal or an International Mobile Telecommunication (IMT)-2000 signal). The donor module 3000 decreasingly converts a forward frequency signal received from the base station 200 or repeaters
300 into an Intermediate Frequency (IF) signal, and transmits the IF frequency signal to the antenna module 6000 through a CATV cable. Additionally, the donor module 3000 increasingly converts a reverse IF signal received from the antenna module 6000 to a Radio Frequency (RF) signal, and links the RF signal to the base station 200 or various repeaters 300.
A transmission unit 4000 applies a Direct Current (DC) voltage of +30V to a combiner to apply power to the antenna modules 6000 and transmits the converted IF signal and a two-way On/Off Keying (OOK) modem frequency signal together through a cable. The diplexers each receive the forward IF signal, the OOK modem signal and the DC voltage of DC +30V, with the forward IF frequency signal applied to an RF unit, the OOK modem signal applied to a reception power control unit (OOK modem), and the DC voltage applied to the RF unit and a P through a power unit of an antenna module 6000.
Each of the antenna modules 6000 increasingly converts the received forward IF signal into a higher frequency signal and outputs the higher frequency signal to a mobile phone located in a shadow area through a patch antenna or an omnidirectional antenna, and decreasingly converts the reverse RF signal received from the mobile terminal into an IF signal and outputs the IF signal together with the OOK modem signal to the donor module 3000. FIG. 5 is a block diagram of the donor module. As shown in this drawing, the donor module 3000 is comprised of the transmission unit 3100 that decreasingly converts the forward RF signal (the PCS or IMT-2000 signal) received from the base station 200 or various repeaters 300 into the IF signal, amplifies the IF signal and outputs the amplified IF signal, a four-way coupler 3200 that receives the IF signal received through a CATV cable, a reception unit
3300 that increasingly converts the reverse IF signal received from the four- way coupler into tne P signal ana ιιnκs tne t signal to tne station zυυ or various repeaters 300, and a microcomputer control unit 3400 that detects a bite tone level inputted from all the antenna modules to the reception unit 3300 and remotely controls the antenna modules using the power control unit (the OOK modem) for controlling power through a forward pilot tone, and receives alarm data from the antenna modules and transmits an alarm signal to the base station or mobile phone. The transmission unit 3100 is comprised of a low noise amplifier 3301 that amplifies the forward RF signal (the PCS signal or the IMT-2000 signal) received from the base station (BTS) 200 or repeaters 300, a first variable attenuator 3102 that controls the gain of the forward RF signal, which is passed through the lower noise amplifier 3301, by a control signal of the control unit 3400, a mixer 3103 that converts an output signal of the first variable attenuator 3102 into an IF signal, a LC band pass filter 3104 that filters an output signal of the mixer 3103 to obtain a desired IF signal, a power amplifier 3105 that amplifies the IF signal passed through the LC band pass filter 3104, a second variable attenuator 3106 that detects the level of the IF signal passed through the power amplifier 3105 and controls a gain by an external microcomputer control signal, a power amplifier 3107 that power amplifies an output signal of the second variable attenuator 3106, a level detector 3108 that transmits a center tone frequency signal to the power control unit (the OOK modem) 3111 , a third variable attenuator 3109 that controls power in response to a control message of the power control unit 3111, and a power amplifier 3110 that power amplifies an output signal of the third variable attenuator 3111 and transmits the amplified signal to the four-way coupler 3200 as a reference signal. The reception unit 3300 is comprised of a low noise amplifier 3301 that amplifies the reverse IF signal received by the four- way coupler 3200, a LC band pass filter 3302 that passes a desired IF signal of the IF signal passed through the low noise amplifier 3301, a power control unit (an OOK modem) 3303 that detects a bite tone level outputted from all antenna modules and passed through the LC band pass filter 3302 and controls power through a forward pilot tone, a power amplifier 3304 that amplifies the IF signal passed through the LC band pass filter 3302, a fourth variable attenuator 3305 that power controls the IF signal level passed through the power amplifier 3304 in response to a control message of the power control unit 3303, a mixer 3306 that modulates an output signal of the fourth variable attenuator 3305 into an RF signal (a PCS signal or an IMT-2000 signal), a power amplifier 2207 that power amplifies an output signal of the mixer
3306, and a band pass filter 3308 that passes a desired RF signal of the RF signal outputted from the power amplifier 3307, wherein the output signal passed through the band pass filter 3308 is linked to the base station 200 or repeaters 300.
FIG. 6 is a block diagram of an antenna module. As shown in this drawing, the antenna modules 6000 are each comprised of a diplexer 6100 that enables two-way communication with the donor module 3000, a transmission unit 6200 that increasingly converts an IF signal inputted from the diplexer 6100 into an RF signal (a PCS signal or an IMT-2000 signal) and transmits the RF signal through a patch antenna or an omnidirectional antenna, a power control unit (an OOK modem) 6300 that applies the RF signal to the reception power control unit
(the reception OOK modem) through the diplexer 6100, a duplexer 6600 that transmits a signal of the transmission unit 6200 to an external shadow area and receives an RF signal (a PCS signal or an IMT-2000 signal) transmitted from the mobile phone, a reception unit 6400 that decreasingly converts an RF signal (a PCS signal or an IMT-2000) into an IF signal and transmits the IF signal together with an OOK signal into the diplexer 6100, a Dual Inline Package (DIP) switch 6500 that assigns an unique IDentification (ID) to each of the antenna modules 6000 so that each of the antenna modules 6000 is monitored and controlled by a monitoring unit of the donor module even though several or several tens of antennas 6000 are installed, and a microcomputer control unit 6700 that detects a signal level of each of the antennas 6000 and transmits detected information to the donor module 3000 through the power control unit (the OOK modem) 6500.
FIG. 7 is a view showing an example to which the first and second embodiments are applied. The operation of the example is described in detail hereinafter.
First, when the base station 200 transmits a certain service frequency signal (a PCS signal or an IMT-2000 signal), the donor module 3000 decreasingly converts a forward frequency signal received from the base station 200 or various repeaters 300 into an IF signal and transmits the IF frequency signal to the antenna module 6000 through the CATV cable, and increasingly converts a reverse IF signal received from the antenna modules 6000 to an RF signal and links the RF signal to the base station 200 or repeaters 300.
In more detail, the transmission unit 3100 of the donor module 3000 decreasingly converts the forward . RF signal (the PCS or IMT-2000 signal) received from the base station 200 or various repeaters 300 into the IF signal, amplifies the IF signal and outputs the amplified IF signal, and the four-way coupler 3200 receives the IF signal received through a CATV cable.
That is, in the transmission unit 3100, the low noise amplifier 3301 amplifies the forward RF signal (the PCS or IMT-2000 signal) received from the base station (BTS) 200 or repeaters 300, the first variable attenuator 3102 controls the gain of the forward RF signal, which is passed through the lower noise amplifier 3301, by a control signal of the control unit 3400, and the mixer 3103 converts an output signal of the first variable attenuator 3102 into an IF signal. The LC band pass filter 3104 filters an output signal of the mixer 3103 to obtain a desired IF signal, the power amplifier 3105 amplifies the IF signal passed through the LC band pass filter 3104, and the second variable attenuator 3106 detects the level of the IF signal passed through the power amplifier 3105 and controls a gain by an external microcomputer control signal. The power amplifier 3107 power amplifies an output signal of the second variable attenuator 3106, the level detector 3108 transmits a center tone frequency signal to the power control unit (the OOK modem) 3111, and the third variable attenuator 3109 controls power in response to a control message of the power control unit 3111. Additionally, the power amplifier 3110 power amplifies an output signal of the third variable attenuator 3111 and transmits the amplified signal to the four- way coupler 3200 as a reference signal. Thereafter, the reception unit 3300 increasingly converts the reverse IF signal received from the four-way coupler into the RF signal and links the RF signal to the station 200 or various repeaters 300.
That is, in the reception unit 3300, the low noise amplifier 3301 amplifies the reverse IF signal received by the four-way coupler 3200, the LC band pass filter 3302 passes a desired IF signal of the IF signal passed through the low noise amplifier 3301, and the power control unit (an OOK modem) 3303 detects a bite tone level outputted from all antenna modules and passed through the LC band pass filter 3302 and controls power through a forward pilot tone. Additionally, the power amplifier 3304 amplifies the IF signal passed through the LC band pass filter 3302, the fourth variable attenuator 3305 power controls the IF signal level passed through the power amplifier 3304 in response to a control message of the power control unit 3303, and the mixer 3306 modulates an output signal of the fourth variable attenuator 3305 into an RF signal (a PCS signal or an IMT-2000 signal). Additionally, the power amplifier 2207 power amplifies an output signal of the mixer 3306, and the band pass filter 3308 passes a desired RF signal of the RF signal outputted from the power amplifier 3307, thereby linking the output signal passed through the band pass filter 3308 to the base station 200 or repeaters 300.
The microcomputer control unit 3400 detects a bite tone level inputted from all the antenna modules to the reception unit 3300 and remotely controls the antenna modules using the power control unit (the OOK modem) for controlling power through a forward pilot tone, and receives alarm data from the antenna modules and transmits an alarm signal to the base station or mobile phone.
The transmission unit 4000 applies a voltage of +30V to a combiner to apply power to the antenna modules 6000 and transmits the converted IF signal and a two-way OOK modem frequency signal together through a cable. The diplexers each receive the forward IF signal, the OOK modem signal and the DC voltage of DC +30V, with the forward IF frequency signal applied to an RF unit, the OOK modem signal applied to a reception power control unit (OOK modem), and the DC voltage applied to the RF unit and a P through a power unit of an antenna module 6000.
Each of the antenna modules 6000 increasingly converts the received forward IF signal into a higher frequency signal and outputs the higher frequency signal to a mobile phone located in a shadow area through a patch antenna or an omnidirectional antenna, and decreasingly converts the reverse RF signal received from the mobile terminal into an IF signal and outputs the IF signal together with the OOK modem signal to the donor module 3000.
In each of the antenna modules 6000, the diplexer 6100 enables two-way communication with the donor module 3000, and the transmission unit 6200 increasingly converts an IF signal inputted from the diplexer 6100 into an RF signal (a PCS signal or an IMT-2000 signal) and transmits the RF signal through a patch antenna or an omnidirectional antenna.
The power control unit (an OOK modem) 6300 applies the RF signal to the reception power control unit (the reception OOK modem) through the diplexer
6100, and the duplexer 6600 transmits a signal of the transmission unit 6200 to an external shadow area and receives an RF signal (a PCS signal or an IMT-2000 signal) transmitted from the mobile phone.
The reception unit 6400 decreasingly converts an RF signal (a PCS signal or an IMT-2000) into an IF signal and transmits the IF signal together with an OOK signal into the diplexer 6100. At this time, the Dual Inline Package (DIP) switch 6500 assigns a unique IDentification (ID) to each of the antenna modules 6000 so that each of the antenna modules 6000 is monitored and controlled by a monitoring unit of the donor module even though several or several tens of antennas 6000 are installed.
The microcomputer control unit 6700 detects a signal level of each of the antennas 6000 and transmits detected information to the donor module 3000 through the power control unit (the OOK modem) 6500.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. Industrial Applicability
As described above, the present invention provides an in-building mobile communication repeating system, in which reverse direction output setting need not be performed manually when a plurality of remote modules are installed, increased and removed, and a reverse direction cell radius, a communication quality and a communication capacity are continuously optimized by a power control method using a data transfer format through a tone automatic control function and an OOK modem. Accordingly, repeating can be carried out smoothly between a base station and a mobile station located in a building, so the quality of communications is considerably improved and shadow areas can be eliminated at low cost.

Claims

Claims
1. An in-building mobile communication repeating system using frequency conversion, comprising: a base station (200) for transmitting and receiving a certain service frequency signal (a Personal Communication Service (PCS) signal or an
International Mobile Telecommunication (IMT)-2000 signal); a donor module for decreasingly converting a forward frequency signal received from the base station (200) or a variety of repeaters (300) into an Intermediate Frequency (IF) signal and transmitting the IF frequency signal to the antenna module (6000) through a Cable Television (CATV) cable, and increasingly converting a reverse IF signal received from the antenna module (6000) to a Radio Frequency (RF) signal and linking the RF signal to the base station (200) or repeaters (300); a transmission unit (4000) for applying a Direct Current (DC) voltage of +30V to a combiner to apply power to the antenna modules (6000) and transmitting the converted IF signal and a two-way On/Off Keying (OOK) modem frequency signal together through a cable; a plurality of diplexers for receiving the forward IF signal, the OOK modem signal and the DC voltage of DC +30V with the forward IF frequency signal applied to an RF unit, the OOK modem signal applied to a reception power control unit (OOK modem), and the DC voltage applied to the RF unit and a P through a power unit of an antenna module (6000); and a plurality of antenna modules (6000) for increasingly converting the received forward IF signal into a higher frequency signal and outputting the higher frequency signal to a mobile phone located in a shadow area through a patch antenna or an omnidirectional antenna, and decreasingly converting the reverse RF signal received from the mobile terminal into an IF signal and outputting the IF signal together with the OOK modem signal to the donor module (3000).
2. The in-building mobile communication repeating system according to claim 1, wherein the donor module (3000) comprises: the transmission unit (3100) for decreasingly converting the forward RF signal (the PCS or IMT-2000 signal) received from the base station (200) or various repeaters (300) into the IF signal, amplifying the IF signal and outputting the amplified IF signal; a four- way coupler (3200) for receiving the IF signal received through a CATV cable; a reception unit (3300) for increasingly converting the reverse IF signal received from the four-way coupler into the RF signal and linking the RF signal to the station (200) or various repeaters (300); and a microcomputer control unit (3400) for detecting a bite tone level inputted from all the antenna modules to the reception unit (3300) and remotely controlling the antenna modules using the power control unit (the OOK modem) for controlling power through a forward pilot tone, and receiving alarm data from the antenna modules and transmitting an alarm signal to the base station or mobile phone.
3. The in-building mobile communication repeating system according to claim 2, wherein the transmission unit (3100) comprises: a low noise amplifier (3301) for amplifying the forward RF signal (the PCS or IMT-2000 signal) received from the base station (BTS) (200) or repeaters
(300); a first variable attenuator (3102) for controlling the gain of the forward RF signal, which is passed through the lower noise amplifier (3301), by a control signal of the control unit (3400); a mixer (3103) for converting an output signal of the first variable attenuator (3102) into an IF signal; an LC band pass filter (3104) for filtering an output signal of the mixer (3103) to obtain a desired IF signal; a power amplifier (3105) for amplifying the IF signal passed through the LC band pass filter (3104); a second variable attenuator (3106) for detecting the level of the IF signal passed through the power amplifier (3105) and controlling a gain by an external microcomputer control signal; a power amplifier (3107) for power amplifying an output signal of the second variable attenuator (3106); a level detector (3108) for transmitting a center tone frequency signal to the power control unit (the OOK modem) (311 1); a third variable attenuator (3109) for controlling power in response to a control message of the power control unit (3111); and a power amplifier (3110) for power amplifying an output signal of the third variable attenuator (3111) and transmitting the amplified signal to the four- way coupler (3200) as a reference signal.
4. The in-building mobile communication repeating system according to claim 2, wherein the reception unit (3300) comprises: a low noise amplifier (3301) for amplifying the reverse IF signal received by the four-way coupler (3200); a LC band pass filter (3302) for passing a desired IF signal of the IF signal passed through the low noise amplifier (3301); a power control unit (an OOK modem) (3303) for detecting a bite tone level outputted from all antenna modules and passed through the LC band pass filter (3302) and controlling power through a forward pilot tone; a power amplifier (3304) for amplifying the IF signal passed through the LC band pass filter (3302); a fourth variable attenuator (3305) for power controlling the IF signal level passed through the power amplifier (3304) in response to a control message from the power control unit (3303); a mixer (3306) for modulating an output signal of the fourth variable attenuator (3305) into an RF signal (a PCS signal or an IMT-2000 signal); a power amplifier (2207) for power amplifying an output signal of the mixer (3306); and a band pass filter (3308) for passing a desired RF signal of the RF signal outputted from the power amplifier (3307); wherein the output signal passed through the band pass filter (3308) is linked to the base station (200) or repeaters (300).
5. The in-building mobile communication repeating system according to claim 1, wherein the antenna modules (6000) each comprise: a diplexer (6100) for enabling two-way communication with the donor module (3000); a transmission unit (6200) for increasingly converting an IF signal inputted from the diplexer (6100) into an RF signal (a PCS signal or an IMT-2000 signal) and irradiating the RF signal through a patch antenna or an omnidirectional antenna; a power control unit (an OOK modem) (6300) for applying the RF signal to the reception power control unit (the reception OOK modem) through the diplexer (6100); a duplexer (6600) for transmitting a signal of the transmission unit (6200) to an external shadow area and receiving an RF signal (a PCS signal or an IMT- 2000 signal) transmitted from the mobile phone; a reception unit (6400) for decreasingly converting an RF signal (a PCS signal or an IMT-2000) into an IF signal and transmitting the IF signal together with an OOK signal into the diplexer (6100); a Dual Inline Package (DIP) switch (6500) for assigning an unique
IDentification (ID) to each of the antenna modules (6000) so that each of the antenna modules (6000) is monitored and controlled by a monitoring unit of the donor module even though several or several tens of antennas (6000) are installed; and a microcomputer control unit (6700) for detecting a signal level of each of the antennas (6000) and transmitting detected information to the donor module (3000) through the power control unit (the OOK modem) (6500).
PCT/KR2001/000591 2001-03-02 2001-04-09 Sytem of mobile communication for in-building using frequence transfer method WO2002071648A1 (en)

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