JPH10155176A - Private communication system and radio repeater used for the private communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a private communication system that does not require to install an extension cable among a private branch of exchange and extension terminals distributed in the wide premises. SOLUTION: The private communication system is made up of a portable private branch of exchange 1 that contains a public line network 21, a mobile communication network 22 or a satellite portable communication network 23 or the like, a private radio communication master set 3 contained in an extension of the portable private branch of exchange 1 and having a transmission reception function, a radio repeater having a small power cordless telephone function connecting to the private radio communication master set 3 through a radio channel and a function of relaying a received call and a sent call, and a terminal equipment 50 connecting to the radio repeater 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a private communication system and, more particularly, to a portable private branch exchange accommodating an external line such as a public line network, and a terminal device accommodated in the extension of the portable private exchange via radio. And a private communication system comprising:

[0002]

2. Description of the Related Art As a conventional private communication system, a private branch exchange connected to a public line network accommodates an extension terminal device, and at least a part of the extension terminal device is disposed on a premises. A private wireless communication system in which the extension wireless communication terminal device is accommodated in a communication area of the master device to form a system and talks with the extension wireless communication terminal device moving in the premises via the wireless communication master device. Has been proposed. When such a private wireless communication system is used in a large premises such as golf, for example,
A wireless communication base unit and a private branch exchange, which are grounded at a plurality of locations so that the call area covers the golf course, are connected by a cable. Further, when such a private wireless communication system is used in a three-dimensional area such as an office building, a cable is connected between the private wireless communication master unit installed on each floor and the private branch exchange. On the other hand, in a mobile communication system, a portable personal computer, a portable facsimile, or the like is connected to a communication terminal device to transfer data.

[0003]

In a conventional private wireless communication system, a cable must be connected between a private wireless communication base unit and a private branch exchange, and when a plurality of extension terminal devices are accommodated, a wiring is required. Is congested, and when installed in a large premises, there is a problem that the cost for wiring becomes large, and each extension terminal device needs to be a mobile telephone. In addition, in order to construct a private communication system only for a limited period at a site where a public network is not installed, such as when constructing a dam in a mountainous area, first lay the public network to the construction site. And wiring had to be laid on a large construction site. On the other hand, even in a conventional mobile communication system, in order to construct a private communication system in the above environment, a relay station having a large output must be newly installed. Even when making a call, the user has to go through a mobile communication system, and there is a problem that the call charge becomes expensive.

An object of the present invention is to solve the above-mentioned problems, and more specifically, to provide a private communication system which does not require an extension cable to be laid between a private branch exchange and extension terminals scattered over a wide area. The purpose is to provide. A further object of the present invention is to provide a private wireless communication system in which an existing terminal device can be used as an extension terminal device. Another object of the present invention is to provide a private communication system that can be installed in a mountainous area away from the public line network without extending the public line network or newly installing a wireless relay station. .

[0005]

In order to achieve the above-mentioned object, the present invention relates to a portable private branch exchange housed in a public line network or a mobile communication network or a satellite portable communication network in a private communication system, A private wireless communication main unit accommodated in an extension of the portable private branch exchange, a wireless repeater having a low-power cordless telephone function connected to the private wireless communication main unit via radio and a function of relaying outgoing and incoming calls When,
And a terminal device connected to the wireless repeater.

Further, the present invention provides a wireless repeater used in the above-mentioned local communication system, a low-power cordless telephone function, a function of transferring an incoming call from a local wireless communication master unit to a terminal device, and a function of transmitting a call from the terminal device to the local device. A wireless repeater having a function of transferring to a wireless communication master unit.

Further, in the present invention, the above-mentioned radio repeater is provided with a loop detection circuit for detecting off-hook of a single telephone, a call signal control circuit, a ring trip circuit, and a PB signal detection circuit.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The outline of the configuration of the present invention will be described with reference to FIG.
The private wireless communication system according to the present invention includes a portable private branch exchange 1, an outside line 2 such as a public line, a private wireless communication base unit 3 housed in the private branch exchange, a portable wireless repeater 4, A single telephone 50 connected to the wireless repeater by wire
And an extension terminal device 51 such as a key telephone or a cordless key telephone housed in the private branch exchange 1.

The private branch exchange 1 is configured as a small portable private branch exchange, and a time division switch (TSW) 1
1 and an external line interface unit 12 for interfacing with an external line such as a public telephone network 21, a mobile telephone 22 of a mobile telephone network, or a mobile telephone 23 of a satellite telephone network.
And a wireless interface unit 13 for interfacing with the local wireless communication base unit 3, a digital interface unit 14 for interfacing with the key telephone extension unit 51, and a conference call between extensions or between an extension and an outside line. A conference call unit 15;
Call control unit 16 for controlling calls in the private branch exchange
And a premises broadcast unit 17 for broadcasting to extension terminals
And an operation panel 18 for manual replacement.

The local wireless communication base unit 3 is a base unit for the low power cordless telephone 32, and is a minute output wireless transmitter for transmitting in a specific frequency band. Such a wireless transmitter expands a communication area to, for example, about 500 m without increasing output by making the antenna a high-performance one, or gives directionality to the communication area by giving directivity to the antenna. It is possible to enlarge the communication area by holding it.

The wireless repeater 4 has a function equivalent to that of the conventional low power cordless telephone 32 and also has a function of connecting to the single telephone 50. The low-power cordless telephone function includes a function of establishing a wireless link between the master unit and the slave unit according to a predetermined duplex system, a function of notifying the slave unit of an incoming call detected via the wireless link to the slave unit. A function of transmitting dial information to a base unit when making a call, and a call function.

A specific configuration of the wireless repeater 4 will be described with reference to FIG. The wireless repeater 4 includes an arithmetic processing circuit (CPU)
400, a wireless transmission / reception unit 401, a modulation circuit 402,
Amplifying circuit 403, loop detecting circuit 405 for detecting off-hook of single telephone 50, transformer 404 for isolating amplifying circuit 403 and loop detecting circuit 405, ringing signal control circuit 406, ring trip circuit 407, and dial key. A PB signal receiving circuit 408 that receives the transmitted push button (PB) signal, and a dial tone (DT) that is transmitted to the line at the time of calling, detects the call completion. Alternatively, the operation state of the tone detection circuit 409 for detecting a busy tone (BT) transmitted to the line at the end of the call and forcibly restoring the line, the key matrix circuit 410, the call signal generation circuit 411, and the radio repeater 4 are determined. And a buzzer circuit 413 for displaying an incoming call. Wireless transceiver 4
Reference numeral 01 denotes a low-frequency amplifier, a multi-stage bandpass filter, a multi-stage mixer, a reception circuit including a multi-stage reception power amplifier, a band-pass filter, and a transmission power amplifier which constitute a normal low-power cordless telephone. Transmission circuit. Key matrix circuit 410
Are composed of dial keys (1 to 0, *, #) and control keys (call, off, hold), and are used when a call is transmitted / received from the wireless repeater 4.

The operation of the private wireless communication system according to the present invention will be described below with reference to FIGS. The private branch exchange 1 is prepared in advance so that the following functions can be selected for incoming calls. Group incoming call display (button telephone function) When there is an incoming call on the external line interface 12, a terminal group (a group of the extension terminal devices 51, a group of the local wireless communication base unit 3, etc.) which can respond to the external line number is determined in advance. Function to ring the corresponding terminal group. Direct Incoming Call Display When a call arrives at the external line interface 12, a terminal (extension terminal device 51, local wireless communication master device 3, etc.) corresponding to the external line number is determined in advance, and the corresponding terminal device is ringed. function.

In the following, a description will be given of an incoming call process when the private branch exchange 1 selects the above function. In the private branch exchange 1, when an incoming call is received by the external line interface unit 12, a state change occurs in the external line interface unit 12. The communication control unit 16 includes the external line interface 12
Is periodically scanned, and an incoming call to the external line interface 12 is detected based on the state change. The communication control unit 16 that has detected the incoming call selects a corresponding extension from, for example, the extension number given to the incoming signal, and, via the wireless interface 13, the local wireless device facing the wireless repeater 4 to which the single telephone 50 is connected. The communication base unit 3 is started.
The local wireless communication base unit 3 emits a radio wave calling the wireless repeater 4, and the local wireless communication base unit 3 according to a predetermined duplex system (for example, MCA: multi-channel access system).
A wireless link is established between the wireless communication device and the wireless repeater 4, and a coded incoming signal is transmitted through the wireless link.

The wireless transmission / reception unit 401 of the wireless repeater 4 that has received the coded incoming signal transmitted from the local wireless communication base unit 3 notifies the arithmetic processing circuit 400 of the incoming. When detecting the incoming call, the arithmetic processing circuit 400 controls the calling signal control circuit 406 to transmit the oscillating signal of the calling signal generating circuit 411 as a calling signal, ring the single telephone 50, and notify the incoming call. The call signal control circuit 406 cuts the oscillation signal (20 Hz) of the call signal generation circuit 411 by an arithmetic processing circuit 400 at intervals of usually 1 second contact and 2 seconds off as a call signal (nominal 85 V).
Send to When the ring trip circuit 407 detects that the single telephone 50 has gone off-hook and responded to the incoming call, the arithmetic control circuit 400 monitoring the ring trip circuit.
Recognizes the response, controls the paging signal control circuit 406 to stop the transmission of the paging signal, extends the communication path to the loop detection circuit 405, and transmits the radio signal from the radio transmission / reception unit 401 to the local radio communication base station 3 via the radio channel. And sends the coded incoming response signal to

On the other hand, the call control unit 16 of the private branch exchange 1 that has recognized the incoming call response by the incoming call response signal passed through the local wireless communication base unit 3-wireless interface 13 transmits the position of the incoming external line interface 12 on the next division switch 11, Since the position of the responding single telephone 50, that is, the position of the corresponding private wireless communication master unit 3 on the wireless interface 13 is recognized, a response signal is transmitted to the external line interface 12 and the time division switch 11 is controlled to receive the incoming call. Connect the call path between the outside line and the answering terminal. Through the above processing, the connection between the incoming external line and the extension-only telephone 50 is established, and the telephone is in communication.

Next, a process of making a call from the single telephone 50 via the wireless repeater 4 will be described with reference to FIG. When the push-button single telephone 50 goes off-hook, the off-hook signal of the loop detection circuit 405 changes, and the arithmetic processing device 400 detects the off-hook of the single telephone 50 based on this change. The arithmetic processing unit 400 that has detected the off-hook of the single telephone set 50 sends out a call key pressing signal to the local wireless communication base unit 3 via the wireless transmission / reception unit 401, and communicates with the wireless repeater 4 in accordance with a normal low power cordless telephone control procedure. A wireless link is established with the private wireless communication base unit 3 so that a dial tone (DT) from the private branch exchange 1 can be heard. After listening to the dial tone, the dial signal (PB signal) transmitted by depressing the dial provided on the single telephone 50 is transmitted to the call signal control circuit 4.
06-Loop detection circuit 405-Transformer 404-Amplifier circuit 403, the signal is received by PB signal receiving circuit 408, and arithmetic processing unit 400 recognizes the dialed digit based on this signal. The arithmetic processing circuit 400 sequentially sends the dial information to the private branch exchange 1 via the wireless transmission / reception unit 401, the wireless link, and the private wireless communication base unit 3, and the private exchange 1 executes normal connection control.

When the outgoing call from the single telephone 50 is an outgoing call, the external line port of the time-division switch 11 is captured and the connection control to the external line 2 is executed.
When the call from 0 is to an extension, the extension port of the time-division switch 11 is captured and the extension terminal 51
The connection control to is executed.

As described above, according to the present invention, a private radio communication base unit is accommodated as an extension of a private branch exchange accommodating an outside line, and a wireless relay function having a function of a low power cordless telephone corresponding to the base unit is provided. Since the single telephone is connected, it is possible to omit the routing of the extension cable for a long distance. Therefore, if such a private wireless communication system is used at a construction site, for example, it is possible to communicate with a base station on the ground and a single telephone in a tower crane by extension,
Data from a computer provided in the tower crane can be wirelessly transmitted as a pseudo audio signal to a central processing unit connected to a private branch exchange provided on the ground via an extension. In addition, by using the output from the mobile phone 22 as an external line accommodated in the private branch exchange 1, it is possible to construct an inexpensive extension network connected to an external line even in a premises provided at a place away from the public line network. Can be. Further, as an external line accommodated in the private branch exchange 1, the satellite communication terminal 2
By using the output from 3, an extension network connected to an outside line can be constructed at low cost even in a premises provided in an area isolated from a public telephone network and a mobile telephone network such as a mountain area.

In the above description, the radio repeater 4 is created independently. FIG. 3 shows an example of the radio repeater 4 'in which the low power cordless telephone function is achieved by using an existing power transmission cordless telephone. explain. Wireless repeater 4 'of this embodiment
Is a normal low power cordless telephone (SRTP) 31
, An arithmetic processing unit (CPU) 400 and the telephone 31
Amplifying circuit 403 that amplifies the output of the speaker output terminal SP of the telephone set 5 and amplifies the signal from the single telephone set 50 described later and inputs the amplified signal to the microphone input terminal MIC of the telephone set.
A loop detection circuit 405 for detecting an off-hook of 0, a transformer 404 for insulating the amplification circuit 403 and the loop detection circuit 405, a ring signal control circuit 406, a ring trip circuit 407, a PB signal detection circuit 408, and a tone detection circuit. 409, a key matrix circuit 410, a calling signal generation circuit 411, and a light emitting diode (LED) 41
2, a buzzer 413 for displaying an incoming call, SRTP key control equivalent 414, and a call signal control relay 415. The low power cordless telephone 31 includes an arithmetic processing unit 310, a wireless transmission / reception unit 311 and a modulation / demodulation circuit 31.
2, a key matrix 313, and a buzzer circuit 314, and further includes a terminal 315 for receiving a signal from the SRTP key control equivalent circuit 414, and an output terminal 316 to the buzzer circuit. I have.

Hereinafter, the operation of the private wireless communication system according to the present invention will be described. The low power cordless telephone 31 of the wireless repeater 4 ′, which receives the coded incoming signal transmitted from the local wireless communication base unit 3 similar to the above embodiment, uses the buzzer circuit 413 to the arithmetic processing circuit 400. Notify incoming call. Arithmetic processing circuit 400
When detecting the incoming call, the control unit controls the call signal control circuit 406 to transmit the oscillation signal of the call signal generating circuit 411 as a call signal, and to ring the single telephone 50 to notify the call. When the ring trip circuit 407 detects that the single telephone 50 has gone off-hook and answered the incoming call, the arithmetic and control circuit 400 monitoring the ring trip circuit recognizes the response and controls the call signal control circuit 406 to control the call signal. Is stopped, and the communication path is extended to the loop detection circuit 405. When recognizing the response, the low power cordless telephone 31 sends a coded incoming response signal to the local wireless communication base unit 3 via the wireless channel.

On the other hand, the call control unit 16 of the private branch exchange 1 which has recognized the incoming call response by the incoming call response signal passed through the local wireless communication base unit 3-wireless interface 13 transmits the position of the incoming external line interface 12 on the next division switch 11, Since the position of the responding single telephone 50, that is, the position of the corresponding private wireless communication master unit 3 on the wireless interface 13 is recognized, a response signal is transmitted to the external line interface 12 and the time division switch 11 is controlled to receive the incoming call. Connect the call path between the outside line and the answering terminal. Through the above processing, the connection between the incoming external line and the extension-only telephone 50 is established, and the telephone is in communication.

Next, a description will be given of a process of making a call from the single telephone set 50 via the wireless repeater 4 'with reference to FIG. When the push-button single telephone 50 goes off-hook,
The off-hook signal of the loop detection circuit 405 changes, and the arithmetic processing device 400 detects the off-hook of the single telephone 50 by this change. The arithmetic processing device 400 that has detected the off-hook of the single telephone 50 controls the point provided in the STRP key control equivalent circuit 414, which has the same function as pressing down the talk key of the low power cordless telephone 31, to operate the low power cordless telephone. The same signal as when the call key is depressed is transmitted to the low power cordless telephone 31.

[0024] The low power cordless telephone 31 sends a call key depressing signal to the local wireless communication base unit 3 and operates between the low power cordless telephone 31 and the local wireless communication base unit 3 according to a normal low power cordless telephone control procedure. A wireless link is established and dial tone (DT) from private branch exchange 1
Can be heard. Low power cordless telephone 31
The signal from the speaker terminal SP can be heard by the single telephone set 50 via the amplifier circuit 403, the transformer 404, the loop detection circuit 405, and the call signal control circuit 406. The dial signal (PB signal) transmitted by depressing the dial provided on the single telephone 50 is transmitted to the call signal control circuit 40.
6-loop detection circuit 405-transformer 404-amplifier circuit 403 and received by PB signal receiving circuit 408,
The arithmetic processing unit 400 recognizes the dialed digit based on this signal. The arithmetic processing circuit 400 controls the STRP key control equivalent circuit 414 according to this dial, and sequentially sends dial information to the private branch exchange 1 via the low power cordless telephone 31-the private wireless communication base unit 3, and in the private branch exchange 1, Normal connection control is performed.

Next, an incoming call process when there is an incoming call to the single telephone set 50 via the wireless repeater 4 'will be described with reference to FIG. When an incoming call arrives at the private branch exchange 1, the incoming call information is transmitted to the low power cordless telephone 31 via the private wireless communication base unit 3, the information is output to the buzzer circuit 413, and the incoming call is displayed and the incoming call information BZ1 is displayed. It is sent to the arithmetic processing unit 400. When detecting the incoming call information, the arithmetic processing unit 400 generates a ringing signal (bell ringing signal) by periodically operating the ringing signal control relay 415, and transmits this signal to the single telephone via the ringing signal control circuit 406. The call is sent to the telephone 50 and the bell of the single telephone 50 is sounded to notify the incoming call. When the single telephone 50 is hooked off, the ring trip circuit 407 responds and sends a response signal to the arithmetic processing circuit 40. The arithmetic processing circuit 400 that has detected the response signal controls a point provided in the STRP key control equivalent circuit 414, which has a function (response operation) equivalent to pressing down the talk key of the low power cordless telephone 31 to operate the low power cordless telephone. The same signal as when the telephone 31 depresses the call key is output to the low power cordless telephone 31 to complete the response operation for the incoming call in the wireless repeater 4 '. The response signal is a low power cordless telephone 3
1 is sent to the private branch exchange 1 via the private wireless communication base unit 3 to perform a normal response process, and a communication path is set.

As described above, according to the present embodiment, an existing cordless telephone can be used as a part for achieving the low power cordless telephone function in configuring the wireless repeater. Thus, a simple repeater can be obtained.

Another use example of the present invention will be described with reference to FIG. This embodiment is an example in which the private wireless communication system of the present invention is installed in a business office such as a sightseeing bus. This system includes a private branch exchange 1 provided in a business office, a local wireless communication master unit 3, a wireless repeater 4 provided in a sightseeing bus, and an audio / video reproducing device 53 such as a karaoke device provided in a sightseeing bus. It is composed of The private branch exchange 1 includes a public network 2
It is connected to a database 100 in which karaoke sources or video sources are stored via one or a dedicated line. The audio-video reproducing device 53 mounted on the sightseeing bus has a storage device 5 for storing programs such as karaoke and video.
31. When updating the program content stored in the storage device 531, the sightseeing bus is connected to the local wireless communication base unit 3.
Then, the private branch exchange 1 accesses the database 100 via a public line network or the like, and receives necessary program data. The program data transmitted from the database 100 is transmitted to the wireless relay device 4 of the sightseeing bus via the local wireless communication master device 3 and downloaded to the storage device 531 of the audio / video reproducing device 53.

By adopting such a system,
Video and karaoke programs can be stored each time according to the audience, and the same program can be downloaded simultaneously to a plurality of sightseeing buses. In addition, a unique database 18 such as a sightseeing guide is provided in the business office, and the database 18 is downloaded to the audio / video reproducing device 53 via the private branch exchange 1-the local wireless communication master unit 3-wireless repeater 4. We can provide the best tourist information.

[0029]

As described above, according to the present invention, at least a part of the extension terminal device accommodated in the private branch exchange is used as a base unit (private wireless communication base unit) of a low power cordless telephone.
The slave unit has a low power cordless telephone function and a wireless repeater having a function of relaying incoming and outgoing calls, and a single telephone is connected to the wireless repeater, so a wireless communication extension network is set up within the premises within the range defined by the broom. The extension network can be set in a wide area at low cost. Further, by realizing the low power cordless telephone function of the wireless repeater with the existing low power cordless telephone, the wireless repeater itself can be inexpensively and simply configured. Furthermore, by using not only the public line network but also a mobile communication network or a satellite portable communication network as the external line accommodated in the exchange, the private communication network can be easily and inexpensively provided at a location away from the public line network. .

[Brief description of the drawings]

FIG. 1 is a conceptual diagram illustrating an outline of a configuration of a private communication system according to the present invention.

FIG. 2 is a block diagram showing a configuration of a wireless repeater used in the private communication system according to the present invention.

FIG. 3 is a block diagram showing another configuration example of the wireless repeater used in the private communication system according to the present invention.

FIG. 4 is a conceptual diagram showing an example of using a private communication system according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 private branch exchange 2 outside line 3 private wireless communication base unit 4, 4 'wireless repeater 400 arithmetic processing unit 402 demodulation circuit 403 amplification circuit 404 transformer 405 loop detection circuit 406 call control circuit 407 ring trip circuit 408 PB signal reception circuit 409 tone detection Circuit 410 Key matrix 412 LED circuit 413 Buzzer circuit 414 SRTP key control equivalent circuit 415 Ring signal control relay 11 Time division switch (TSW) 12 External line interface unit 13 Wireless interface unit 14 Digital interface unit 15 Conference call unit 16 Call control unit 17 Premise Broadcasting unit 18 Operation panel 21 Public line network 22 Mobile communication network 23 Satellite portable communication network 31, 32 Low power cordless telephone handset 300 Arithmetic processing circuit 311 Wireless transmitting / receiving section 312 Modulation / demodulation circuit 313 Key matrix 314 Buzzer circuit 50 Single phone 51 Button phone, cordless button phone 52 Cordless button phone handset 53 Audio / video reproduction device

Continued on the front page (72) Inventor Naoki Natori 2- 40-2 Daizawa, Setagaya-ku, Tokyo Nakayo Engineering Co., Ltd.

Claims (3)

[Claims] 1. A portable private branch exchange accommodating a public line network, a mobile communication network, a satellite portable communication network, or the like, a private wireless communication main unit having a transmission / reception function accommodated in an extension of the portable private exchange, An on-premise communication system comprising: a wireless repeater having a low-power cordless telephone function and a function of relaying incoming and outgoing calls connected to the local wireless communication base unit via radio, and a terminal device connected to the wireless repeater . 2. A wireless repeater for use in the private communication system according to claim 1, wherein said terminal is a low power cordless telephone function, a function of transferring an incoming call from a private wireless communication base unit to a terminal device, and A wireless repeater having a function of transferring an outgoing call from a mobile station to a local wireless communication master unit. 3. The wireless repeater according to claim 2, further comprising a loop detection circuit for detecting off-hook of the single telephone, a call signal control circuit, a ring trip circuit, and a PB signal detection circuit. .