JP4886595B2 - Mobile communication repeater device, slave station and communication control method - Google Patents

Description

  The present invention relates to a mobile communication repeater device installed in a building or the like, a slave station, and a communication control method.

  As an indoor countermeasure repeater device connected to a mobile phone base station as a countermeasure for dead zones in high-rise apartments, office buildings, etc., a ROF (Radio Over Fiber) system is used to connect each mobile phone terminal to each door, floor, or zone. There is a system in which one mobile station device that performs wireless communication is installed one by one and a mobile phone can be communicated at any location in the room.

  In mobile phone applications in which extension telephone terminals that communicate in a building of a company office and general public mobile phone terminals are used, it is always connected to a repeater on the indoor countermeasure side in the building. Need to communicate.

  However, in this case, when the outdoor base station has a relatively strong signal strength, such as near a window, there is a possibility that the dual-purpose mobile phone terminal may be misconnected to the outdoor base station and communicate even though it is indoors. It was.

  In particular, the strength of radio waves from outdoor base stations is often affected by the environment of surrounding buildings.For example, when a new high-rise building is built in the vicinity of a building in operation, the reception strength from the base station is affected by reflections. However, there is a problem that may become stronger than before, exceeding the reception intensity of the radio wave from the repeater. Further, the output of the base station is controlled according to the call status with the dual-purpose mobile phone terminal in the cover area.

In order to prevent erroneous connection between a repeater for indoor countermeasures and a general area, a method for transmitting transmission restriction information for transmitting a control signal for preventing erroneous connection from a repeater or a base station to a mobile phone terminal ( For example, there is Patent Document 1), but the operation of the repeater or the base station becomes complicated, and the burden of connection control increases. In addition, when the control signal cannot be received normally, an erroneous connection may occur.
Japanese Patent Laying-Open No. 2005-101976 (page 13, FIG. 4)

  A conventional mobile phone operation system using a mobile communication repeater for indoor use is erroneously transmitted to an external base station when a dual-purpose mobile phone terminal operating indoors receives a signal at a level higher than that received from the repeater from an external base station. There was a problem connecting.

  The present invention has been made to solve the above problem, and a dual-purpose mobile phone terminal operated in a building in which an indoor repeater is installed communicates via the repeater without erroneous connection to an external base station. It is an object of the present invention to provide a mobile communication repeater device, a slave station, and a communication control method.

In order to achieve the above object, the mobile communication repeater of the present invention is a mobile communication terminal in which a mobile terminal serving both as an extension for a specific area and a mobile phone terminal for public use are installed in the specific area. In a mobile communication repeater device that connects to a slave station of a communication repeater device and performs wireless communication of the extension, a master station that relays and transmits a wireless communication signal between the slave station and the dual-purpose portable terminal, and the master station An intra-area base station means for performing connection and communication management between the dual-purpose portable terminal and the extension communication, a transmission / reception processing means for processing transmission / reception of radio communication signals between the master station, and the master station A transmission power amplifier that outputs a signal input from the antenna as a radio wave that is transmitted to the dual-purpose portable terminal, and a reception level that measures the reception level of the radio wave having the same frequency as the transmitted radio wave and notifies the control means And Le measuring means, connected to the output of one of the switching terminal is the transmission power amplifier, is the other switching terminal connected to an input of the first reception level measuring means,
By switching means for selecting either one and connecting to the antenna, and control for switching the connection destination of the switching means from the output of the transmission power amplifier to the input of the reception level measuring means at a predetermined switching timing or switching interval. Control that increases the output of the transmission power amplifier when the reception level measured by the reception level measurement means is input from the antenna and measured and notified by transmitting radio waves from the public base station is greater than a predetermined level. And a slave station having a control means for performing the operation.

  Further, the slave station of the mobile communication repeater device according to the present invention is configured such that the extension mobile phone that is used as the extension mobile phone terminal for a specific area and the public mobile phone terminal can communicate with the extension to which the radio terminal transmits and receives radio waves. In the slave station of the mobile communication repeater device that relays and transmits the radio communication signal with the master station in order to communicate with the in-area base station means that performs communication management and communication management of the radio communication signal with the master station Transmitting / receiving processing means, a transmission power amplifier for outputting the radio communication signal input from the master station as a radio wave transmitted from an antenna to the dual-purpose portable terminal, and a reception level of a radio wave having the same frequency as the transmitted radio wave Receiving level measuring means for measuring and notifying the control means, one switching terminal connected to the output of the transmission power amplifier, and the other switching terminal connected to the input of the receiving level measuring means And switching means for selecting one of them and connecting to the antenna, and switching the connection destination of the switching means from the output of the transmission power amplifier to the input of the reception level measuring means at a predetermined switching timing or switching interval. When the reception level measured by the reception level measurement means input from the antenna and receiving the transmission radio wave from the public base station is greater than a predetermined level, control is performed to increase the output of the transmission power amplifier. And a control means.

  Further, the communication control method of the slave station of the mobile communication repeater device according to the present invention is such that a mobile terminal serving both as an extension for a specific area and a public mobile telephone as a destination for transmitting and receiving radio waves. In order to communicate with the in-area base station means for connection and communication management of the extension, the transmission power amplifier, the reception level measuring means, the switching means, and the control means are provided to relay and transmit the wireless communication signal with the master station. In the slave station communication control method of the mobile communication repeater device, the transmission power amplifier outputs the radio communication signal input from the master station as a radio wave transmitted from an antenna to the dual-purpose portable terminal via the switching means. The control means switches the connection destination of the switching means from the output of the transmission power amplifier to the input of the reception level measuring means at a predetermined switching timing or switching interval. The reception level measuring means notifies a reception level measured by inputting a transmission radio wave from the public base station from the antenna to the previous period control means, and the control means is configured to determine whether the notified reception level is predetermined. When the level is larger than the level, control for increasing the output of the transmission power amplifier is performed.

  According to the present invention, a mobile communication repeater device, a slave station, and a communication control method for a dual-purpose portable terminal that is operated in a building in which an indoor repeater is installed communicate with each other without being erroneously connected to an external base station Can be provided.

  Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a conceptual diagram of communication using an indoor mobile communication repeater device according to an embodiment of the present invention.
In FIG. 1, a mobile communication repeater device is a base station 1 in a specific area that performs communication control between a cellular phone terminal 5 for extension and public use in a building (hereinafter abbreviated as a portable terminal 5). A slave station 3a to 3n (hereinafter referred to as “wireless communication”) that communicates wirelessly with the master station 2 and the portable terminal 5 that are connected to the base station 1 in the specific area and relay the optical signal obtained by converting the radio signal with the slave station 3. When the common items for the slave stations 3a to 3n are described, they are omitted as the slave station 3.) and the optical cable 4 for connecting the master station 2 and the slave station 3 (a coaxial cable may be used. This will be described as an example.).

  The slave stations 3 are installed in a distributed manner on each floor in the building. For example, the slave stations 3a and 3b are installed on the first floor, and signals such as connection and communication with the mobile terminal 5 are transmitted / received via the master station 2. It is controlled by the base station 1 in a specific area. The mobile terminal 5 moves in each floor, but performs wireless communication with a nearby, for example, the slave station 3b indoors. The master station 2 and the specific area base station 1 may be independent from each other or may be integrated relay base station means.

  However, when a base station is installed outside the building, the reception intensity of radio waves from the base station antenna 6 may be stronger than that received from the slave station 3b. When the mobile terminal has a public mobile phone function, a link for wireless communication via the base station antenna 6 is set, in other words, connected.

  The mobile communication repeater apparatus according to the embodiment of the present invention uses the following means and method for controlling the transmission level at each of the slave stations 3a to 3n, so that the portable terminal 5 is stronger than the received radio wave from the external base station antenna 6. Can be received from the slave station 3.

FIG. 2 is a functional block diagram for explaining the operation and processing procedure of the slave station of the mobile communication repeater apparatus according to the embodiment of the present invention.
In FIG. 2, the slave station 3 processes a signal for wireless communication between the master station 2 and the E / O 312, O / E 311, and the portable terminal 5 that transmit and receive optical signals via the optical cable 4. Wireless communication using the antenna 34 for transmitting and receiving radio waves to and from the portable terminal 5, the antenna 34 for transmitting and receiving radio waves to and from the mobile terminal 5, and the like. A duplexer 33 that separates radio waves into transmission radio waves and transmission radio waves, an LNA (low noise amplifier) 36 that is connected to the reception terminal r of the duplexer 33 and that amplifies the radio waves received from the portable terminal 5 and outputs the amplified radio waves to the transmission / reception processing unit 31. Is connected to the transmission terminal s of the duplexer 33, and the connection destination is a switch for selecting one of the output of the PA (transmission power amplifier) 32 (terminal p) or the input of the LNA 303 (terminal a). 301, LNA 303 that amplifies the received radio wave from base station antenna 6 that is transmitted at the same frequency fs as the transmission frequency of PA 32 that transmits radio waves to indoor portable terminal 5, and the output level of base station antenna 6 from the output level of LNA 303 The level measurement unit 302 that measures the reception level and outputs the data to the control unit 30, outputs a control signal for switching the connection destination of the switch 301, and installs the slave station 3 from the reception level data from the level measurement unit 302 And a control unit 30 that controls the PA 32 to a preset output so that the reception level is equal to or higher than the reception level of the radio wave from the base station antenna 6 in the area.

  As will be described later, the control unit 30 stores the data measured by the level measurement unit 302 in the internal memory 30M.

  As for the radio signal input / output to / from the transmission / reception processing unit 31 via the master station 2 and the E / O 312 and O / E 311, the downlink signal of the frequency f1 is transmitted from the PA 32 via the duplexer 33 and the antenna 34, similarly. An upstream signal having a frequency f2 is received. When the radio wave from the antenna 6 of the outdoor base station covering the area where the building is built reaches the antenna 34 and the radio wave has the frequency f1, the mobile terminal 5 in the building There is a possibility of connection processing with the station.

  That is, the conventional slave station does not have the control unit 30, the LNA 303, the level measurement unit 302, the control unit 30, and the switch 301, and the output of the radio wave transmitted from the transmission power amplifier toward the slave station is externally transmitted. The feedback control was not performed with reference to the received intensity of the received radio wave. And since it was transmitted with small output sufficient for in-building communication, there was a problem of erroneous connection when the mobile terminal 5 received strong radio waves from an external base station.

  In the slave station 3 according to the embodiment of the present invention, the control unit 30 normally connects the switch 301 to the s terminal of the duplexer 33 so that the output from the PA 32 is transmitted from the antenna 34 to the building as a downlink radio wave. . On the other hand, radio waves from the external base station antenna 6 are similarly received in the building, but the frequencies of both downlinks are the same. Therefore, even if the reception level from the outside is to be measured, the output of the radio wave transmitted by the PA 32 of the slave station 3 is received, which is much stronger than the external radio wave.

FIG. 3 is a flowchart showing a processing procedure of transmission output control of a slave station according to the embodiment of the present invention. Hereinafter, the transmission output control operation of the slave station will be described with reference to FIGS.
In mobile phone systems, downlink radio waves are transmitted in bursts during transmission, but control signals for controlling access between mobile terminals and base stations are transmitted almost continuously. Therefore, it is difficult to receive external radio waves of the same frequency.

  However, in a mobile phone system, there is a momentary interruption that occurs due to movement of a terminal. Therefore, even if a radio wave transmitted from a base station is interrupted for several tens of milliseconds, for example, data retransmission and recovery processing are performed so that access and a call are not hindered. Has been done.

  For example, the control unit 30 refers to an internal timer (not shown), interrupts transmission in a cycle such as once every several minutes (step s1 in FIG. 3), and outputs a switching signal of the switch 301. Control is performed to switch to reception a side for 10 msec (step s2). The LNA 303 receives and amplifies radio waves from the base station antenna 6 via the antenna 34 from the terminal s of the duplexer 33. The level measurement unit 302 measures the reception level of the radio wave received from the base station antenna 6 received by the LNA 303 (step s3) and outputs it to the control unit 30.

  For example, the control unit 30 sets the reference output level transmitted from the antenna 34 of the slave station 3b, for example, the reception intensity on the floor (the first floor) where the slave station 3b is installed, for example, the radio wave at the time of (−10 dBm). The measured mapping data mda or simulation data msa is held in the internal memory 30M. And the portable terminal 5 has memorize | stored the substation reception assumption value of -BdBm which assumed that the electromagnetic wave from the antenna 34 was received with the receiving intensity which fell -bdB from the reference output as an average value.

  Further, the control unit 30 measures the measurement data msd of the received intensity distribution on the floor (first floor) of the radio wave transmitted from the external base station antenna 6, and the measurement received by the antenna 34 and the LNA 303 of the slave station 3b at the time of the measurement. The calibration data cd1 created from the difference data sd1 of the difference from the data moa, for example, the average level difference −20db of the difference data sd1 is held in the internal memory 30M. Therefore, the reception level from the base station antenna 6 on the floor at the same timing can be estimated by subtracting −20 db of the calibration data cd1 from the measurement data moa for the reception data of the LNA 303 at an arbitrary timing.

  If this estimated reception level is -sdBm, on that floor, if -sdBm is lower than the expected -BdBm of the slave station reception value for receiving the transmission radio wave from the slave station 3b (Yes in step s4), the terminal 5 Will be connected to the slave station 3b.

  On the other hand, when the value is high (No in step s4), the control unit 30 sets the transmission level to the correction value A so that (measurement data moa−calibration data cd1) <substation reception expected value (−BdBm) + correction value A. To control the PA 32 to increase the output (step s5). This increase in output is performed by reducing the attenuation amount of an attenuator (not shown) built in the PA 32 or by increasing the amplification gain within a range where the PA 32 is not saturated.

  High linearity is required for PAs such as mobile phone base station transmitters and slave stations, especially when CDMA or OFDM modulation is used. Sometimes an attenuator is used. However, since the efficiency with respect to the drive power source is lowered, when making the slave station highly efficient while suppressing the power consumption of the slave station, for example, if a Doherty PA is used, there is an effect that an efficient slave station can be realized.

  The accuracy of the measurement data and the calibration value differ depending on the application area, but in actuality, the arrangement is devised so that the reception intensity of the radio wave transmitted from the own station is averaged within each cover area of each slave station 3. The

FIG. 4 is a functional block diagram illustrating a configuration example of a slave station that performs transmission output control of the slave station when a downlink signal is transmitted intermittently or burstly from the slave station 3.
In the slave station 3 in FIG. 4, unlike the case of FIG. 2, the received radio wave from the antenna 34 and the duplexer 33 input to the LNA 303 is replaced by the attenuator (ATT) 304 instead of the switch 301. In this case, during a period in which transmission is not performed, the amount of attenuation is suppressed to a low level by the suppress signal input from the control unit 30 to the ATT 304, and during transmission, the amount of attenuation is large and the switch is turned off. This method is effective when the output fluctuation from the base station antenna 6 is large, such as the number of mobile phone terminals accessing an outdoor base station.

  Since the transmission output correction method is the same as in the previous example, the description thereof is omitted.

FIG. 5 is a functional block diagram illustrating a configuration example of the slave station 3 that performs output control by providing a monitor antenna 37 that receives radio waves from the base station antenna 6.
In this method, the monitor antenna 37 is installed away from the antenna 34 of the slave station 3 and at a position where the influence of external radio waves is large on the floor such as a window. In this method, it is not estimated from the radio wave intensity received by sharing the antenna 34 provided in the slave station 3 as shown in FIGS. 2 and 4, but the monitor antenna 32 is provided independently, so that the accuracy is higher. Control becomes possible.

  As in the case shown in FIG. 4, the timing for receiving the incoming radio wave from the base station antenna 6 is normally increased by attenuation of the ATT 304, and the transmission from the PA 32 is stopped for about 10 msec at the time of transmission. As in the case, the attenuation is made small during that time. As in FIG. 2, the input to the LNA 303 may be turned on and off with a switch. Further, when transmitted in a burst form from the slave station 3, the incoming radio wave from the base station antenna 6 is received with the attenuation of the ATT 304 reduced except for the burst transmission timing as in the case of FIG. May be.

  The control of the transmission output of the slave station according to this embodiment does not read the address information of the radio wave transmitted from the base station antenna 6 and the slave station 3, but is controlled only by the reception intensity of the radio wave. It is possible to easily perform communication control related to device signal processing and device scale.

The conceptual diagram of the communication using the indoor mobile communication repeater apparatus concerning the Example of this invention. The functional block diagram explaining the operation | movement of the sub-station | mobile_unit of the mobile communication repeater apparatus concerning the Example of this invention, and a process sequence. The flowchart explaining the operation | movement of a sub-station | mobile_unit of the mobile communication repeater apparatus concerning the Example of this invention, and a process sequence. The functional block diagram which shows the structural example of the sub_station | mobile_unit which performs transmission output control of the sub_station | mobile_unit in case a downstream signal is transmitted from the sub_station | mobile_unit 3 intermittently and in burst. The functional block diagram which shows the structural example of the sub_station | mobile_unit which provides a monitor antenna which receives the electromagnetic wave from a base station antenna, and performs output control.

Explanation of symbols

1 Base station in specific area 2 Master stations 3a to 3n Slave station 30 Control unit 301 Switch 302 Level measurement unit 303 LNA
304 ATT
31 Transmission / Reception Processing Unit 32 PA (Transmission Power Amplifier)
33 Duplexer 34 Antenna 37 Monitor antenna 5 Mobile terminal 6 Base station antenna

Claims (12)

A mobile terminal serving both as an extension for a specific area and a public mobile phone terminal is connected to a slave station of a mobile communication repeater installed in the specific area to perform wireless communication for the extension. In a mobile communication repeater device,
A master station that relays and transmits a wireless communication signal between the slave station and the dual-purpose portable terminal;
In-area base station means for performing communication management, connection between the dual-purpose portable terminal and the extension communication via the master station ,
Transmission / reception processing means for processing transmission / reception of radio communication signals to / from the master station, a transmission power amplifier for outputting a signal input from the master station as a radio wave transmitted from an antenna to the dual-purpose portable terminal, and the transmission A reception level measuring means for measuring the reception level of a radio wave having the same frequency as the radio wave to be transmitted and notifying the control means, and one switching terminal is connected to the output of the transmission power amplifier,
The other switching terminal is connected to the input of the first reception level measuring means, and the switching means for selecting either one and connecting to the antenna; and the connection destination of the switching means at a predetermined switching timing or switching interval The reception level measured by the reception level measurement means is input from the antenna and measured and notified by the control to switch the output of the transmission power amplifier to the input of the reception level measurement means. A mobile communication repeater apparatus comprising: a slave station including control means for performing control to increase the output of the transmission power amplifier when the level is higher than a predetermined level.
The wireless communication signal relayed and transmitted between the master station and the slave station is:
2. The mobile communication repeater device according to claim 1, wherein the mobile communication repeater device is converted into an optical signal. The control means usually sets the connection destination of the switching means to the output of the transmission power amplifier, and measures the reception level only for a short time when wireless communication between the dual purpose portable terminal and the slave station is not interrupted. 2. The mobile communication repeater device according to claim 1, wherein the mobile communication repeater device is switched to the input of the means.   4. The mobile communication repeater device according to claim 3, wherein the switching time is at most several tens of milliseconds. A mobile terminal that serves as an extension for a specific area and a public mobile phone that communicates with an in-area base station that performs communication connection and communication management of the extension that is a destination for transmitting and receiving radio waves. In the slave station of the mobile communication repeater device that relays and transmits the wireless communication signal with the master station,
A transmission / reception processing means for processing transmission / reception of a wireless communication signal with the master station;
A transmission power amplifier that outputs the radio communication signal input from the master station as a radio wave transmitted from an antenna to the dual-purpose portable terminal; and
A reception level measuring means for measuring a reception level of a radio wave having the same frequency as the transmitted radio wave and notifying the control means;
One switching terminal is connected to the output of the transmission power amplifier, the other switching terminal is connected to the input of the reception level measuring means, and switching means for selecting either one and connecting to the antenna;
The reception level measuring means transmits the radio wave transmitted from the public base station by controlling the connection destination of the switching means from the output of the transmission power amplifier to the input of the reception level measuring means at a predetermined switching timing or switching interval. And a control means for performing control to increase the output of the transmission power amplifier when the reception level measured by inputting from the antenna is larger than a predetermined level, the slave station of the mobile communication repeater device . The control means usually sets the connection destination of the switching means to the output terminal side of the transmission power amplifier, and receives the reception only for a short time when wireless communication between the dual purpose portable terminal and the slave station is not interrupted. 6. The mobile communication repeater apparatus slave station according to claim 5, wherein switching is made to the input terminal side of the level measuring means. The slave station of the mobile communication repeater apparatus according to claim 6, wherein the switching time is at most several tens of milliseconds.
A mobile terminal that serves as an extension for a specific area and a public mobile phone that communicates with an in-area base station that performs communication connection and communication management of the extension that is a destination for transmitting and receiving radio waves. In the slave station that relays and transmits the wireless communication signal with the master station,
A transmission / reception processing means for processing transmission / reception of a wireless communication signal with the master station;
A transmission power amplifier that outputs the radio communication signal input from the master station as a radio wave transmitted from an antenna to the dual-purpose portable terminal; and
A reception level measuring unit that is connected to the antenna via an input attenuating unit and measures a reception level of a radio wave having the same frequency as the transmitted radio wave and notifies the control unit;
The output of the transmission power amplifier is stopped at a predetermined switching timing or switching interval, and during the stop, the reception level measuring means transmits the transmission from the public base station by controlling the attenuation of the input attenuating means. A slave station of a mobile communication repeater apparatus, comprising: a control unit that performs control to increase an output of the transmission power amplifier when a reception level measured by inputting radio waves is higher than a predetermined level. A mobile terminal that serves as an extension for a specific area and a public mobile phone that communicates with an in-area base station that performs communication connection and communication management of the extension that is a destination for transmitting and receiving radio waves. In the slave station that relays and transmits the wireless communication signal with the master station,
A transmission / reception processing means for processing transmission / reception of a wireless communication signal with the master station;
A transmission power amplifier that outputs the radio communication signal input from the master station as a radio wave transmitted from an antenna to the dual-purpose portable terminal; and
A reception level measuring unit connected to a monitor antenna installed in the specific area, measuring a reception level of a radio wave transmitted from the public base station and notifying a control unit;
The output of the transmission power amplifier is stopped at a predetermined switching timing or switching interval, and the reception level measured by the reception level measuring means inputting the transmission radio wave from the base station during the stop is lower than the predetermined level. When it is larger, the slave station of the mobile communication repeater apparatus comprises control means for performing control to increase the output of the transmission power amplifier. In-area base station means for connecting and managing communication of the extension as a destination for transmitting and receiving radio waves, wherein a mobile terminal for a specific area extension mobile phone terminal and a public mobile phone terminal In the communication control method for a slave station of a mobile communication repeater device that comprises a transmission power amplifier, a reception level measuring means, a switching means, and a control means for relaying and transmitting a wireless communication signal with a master station,
The transmission power amplifier is
The radio communication signal input from the master station is output as a radio wave transmitted from the antenna to the dual-purpose portable terminal via the switching means,
The control means switches the connection destination of the switching means from the output of the transmission power amplifier to the input of the reception level measuring means at a predetermined switching timing or switching interval,
The reception level measuring means notifies the previous period control means of a reception level measured by inputting a transmission radio wave from the public base station from the antenna,
The control means includes
A communication control method for a slave station of a mobile communication repeater apparatus, wherein when the notified reception level is higher than a predetermined level, control is performed to increase the output of the transmission power amplifier. The control means includes
The normal connection destination of the switching means is set to the output of the transmission power amplifier, and is input to the reception level measuring means only for a short time when wireless communication between the dual-purpose portable terminal and the slave station is not interrupted. The communication control method for a slave station of a mobile communication repeater device according to claim 10, wherein switching is performed.   12. The communication control method for a slave station of a mobile communication repeater apparatus according to claim 11, wherein the switching time is at most several tens of msec.

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