JP3074964B2 - Terminal identification device and digital mobile communication device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to digital mobile communication using a high-efficiency voice codec. In particular, the present invention relates to non-telephone signal relay between a mobile station and a mobile station or between a mobile station and a non-telephone terminal of a general telephone network.

[0002] In the present invention, a "mobile device" refers to a device that performs wireless communication with a base station. The term "mobile station" refers to a mobile station including a mobile station, an antenna connected to the mobile station, and a terminal device group, for example, a telephone, a facsimile device, a personal computer, and the like.

[0003]

2. Description of the Related Art Digital mobile communication devices using a high-efficiency voice codec have already been put into practical use, but a high-efficiency voice codec cannot always transmit modem signals for non-telephone terminals accurately. Therefore, conventionally, a non-telephone signal relay interface circuit corresponding to a modem signal (hereinafter referred to as a "non-telephone interface")
Is used. That is, it is necessary to provide a non-telephone interface corresponding to a non-telephone signal to be relayed between the mobile station and the radio base station, identify the type of signal to be relayed by some method, and switch between the high-efficiency voice codec and the non-telephone interface There is.

As such an example, Japanese Patent Application Laid-Open No. Hei 3-1417 is disclosed.
Japanese Patent Application Publication No. 33 (Japanese Patent Application No. 1-278455, hereinafter referred to as "prior application") discloses that a mobile station identifies a signal type by detecting an off-hook signal of a mobile station side terminal device, and transmits the identification result to a base station. Has been proposed to switch between a high-efficiency voice codec and a non-telephone interface.

[0005]

However, in the configuration shown in the above-mentioned prior application, it is necessary that each terminal device is directly connected to the high-efficiency voice codec and the non-telephone interface of the mobile device. For this reason, for example, in a usage mode in which a plurality of terminal devices are connected via a two-wire telephone interface, and each is switched by a network control device to connect to a mobile device, the mobile device identifies which terminal has gone off-hook. Can not do it.

A usage mode in which a plurality of terminal devices are connected by a two-wire telephone interface and switched by a network control device is often used in ship phones. Currently, the analog method is adopted for marine telephones. In the analog method, voice signals and non-voice signals are transmitted to the radio section without distinction, so whether the terminal connected to the mobile device is a telephone or a non-telephone terminal It doesn't matter. However, in the future, it will not be possible to use a ship phone digitally.

SUMMARY OF THE INVENTION The present invention solves the above problems and provides a digital mobile communication device capable of identifying a calling terminal by using an existing two-wire transmission line as it is, and a terminal identification device therefor. With the goal.

[0008] A first aspect of the present invention is a terminal identification device, which determines whether a terminal connected to a call is a telephone terminal for voice communication or a non-telephone terminal that generates non-telephone signals other than voice. a first device connected to a transmission apparatus for performing signal transmission by switching between the high efficient speech codec and the non-telephone signal relay interface off Esu circuit according to the type, is connected via a two-wire transmission path to the first device , Comprising a second device that accommodates one or more telephone terminals and non-telephone terminals, the second device detects call origination of the accommodated terminal,
Connecting means for connecting the calling terminal to the first device, and notifying means for notifying the first device of the terminal type of the calling terminal by a frequency not used by any of the telephone terminal and the non-telephone terminal, One device is characterized by including notification detection means for detecting the notification, and connection control means for connecting to the transmission device in accordance with the detected notification.

[0009] The first device detects an incoming call to the connection control means and connects it to the second device, and transmits information for selecting a terminal to either the telephone terminal or the non-telephone terminal. And a terminal selection notifying unit for notifying the second device by a frequency that is not used, wherein the second device detects a notification from the terminal selection notifying unit and a detection output of the terminal selection notification detecting unit. And a called terminal selecting means for selecting a called terminal according to the following.

[0010] In addition, since the type of the terminal on the calling side may not be known at the time of receiving a call, the second device sets the terminal type to the telephone terminal and the non-telephone terminal when the called terminal is off-hook. It is desirable to include an incoming call notification means for notifying the first device by a frequency not used in any of the above.

A second aspect of the present invention is a digital mobile communication device, comprising a mobile terminal connected to a telephone terminal for voice communication and a non-telephone terminal for generating non-telephone signals other than voice. A wireless base station to which the device is wirelessly connected,
The mobile station and the radio base station include a high-efficiency voice codec for voice communication, a non-telephone signal relay interface circuit for transmitting non-telephone signals, a high-efficiency voice codec and a non-telephone signal relay interface circuit. The mobile station further includes means for identifying whether the calling terminal is a telephone terminal or a non-telephone terminal, and wireless notifying means for notifying the wireless base station of the identification result. Further, in the digital mobile communication device including means for controlling the switching means of the own station in accordance with the notification from the mobile device, the mobile device and the terminal are connected via the terminal identification device described above. And

[0012]

According to the present invention, a terminal identification device including a first device and a second device is installed between a mobile device and a plurality of terminal devices connected by a two-wire transmission path to identify a call-connected terminal. Since this device transmits the terminal identification information using a signal out of the band used by the terminal, it becomes possible for the mobile device to identify the terminal connected by call using the existing two-wire transmission path. .

[0013]

FIG. 1 is a block diagram showing a digital mobile communication apparatus according to an embodiment of the present invention. FIGS. 2 and 3 are block diagrams showing an example of a mobile station 8 and a radio base station 9, respectively.

The apparatus of this embodiment comprises a telephone 1 as a telephone terminal for voice communication and a mobile unit 8 to which a facsimile apparatus 2 and a personal computer 3 are connected as non-telephone terminals for generating non-voice signals other than voice. The mobile device 8 includes a wireless base station 9 to which a wireless connection is made. The wireless base station 9 is connected to a general telephone exchange network 10 and connects the telephone 1, the facsimile apparatus 2 or the personal computer 3 to the other party's telephone 11, the facsimile apparatus via the mobile station 8, the wireless base station 9 and the general telephone exchange network 10. 12 or a personal computer 13.

The mobile station 8 includes a high-efficiency voice codec 21 for voice communication, non-telephone interfaces 22 and 23 for transmitting non-telephone signals, and a high-efficiency voice codec 2.
Identifying 1 and interface off Esu switch 24 as switching means for switching between a non-telephone interface 23, a transceiver 25, the calling terminal to the interface off Esu switch 24 whether telephone terminal or non-telephone terminal Means are provided, and a wireless notification means for notifying the wireless base station 9 of the identification result is provided in the transceiver 25.

The radio base station 9 includes a transceiver 31, a high-efficiency voice codec 33 for voice communication, non-telephone interfaces 34 and 35 for transmitting non-telephone signals, a high-efficiency voice codec 33 and a non-telephone Interface 34,
An interface switch 32 and a line switch 36 are provided as switching means for switching between the interface switch 35 and the line switch 35. The interface switch 32 and the line switch 36 are configured to switch according to a notification from the mobile device.

The present embodiment is characterized in that a terminal identification device 4 is provided between the mobile phone 8 and the telephone 1, the facsimile machine 2, and the personal computer 3. The terminal identification device 4 includes a mobile device-side device 7 as a first device connected to a mobile device 8 as a transmission device, and is connected to the mobile device-side device 7 via a two-wire transmission path 6. The above-mentioned telephone terminal and the non-telephone terminal include the telephone 1, the facsimile device 2, and the terminal device 5 as a second device accommodating the personal computer 3.

FIG. 4 is a block diagram showing details of the terminal device 5.

The terminal device 5 includes subscriber line interface circuits 41-1 to 41-3 as call detection means for detecting a call from the accommodated terminal. Controller 4 as connection means for connecting to
5, switches 42-1 and 42-2, low-pass filter 4
3-1 and 43-2 and a two-wire / four-wire converter 44, as a notification means for notifying the type of the calling terminal to the mobile device-side device 7 at a frequency not used by any of the telephone terminal and the non-telephone terminal. , A controller 45, an oscillator 46, a multiplier 47-1, and a high-pass filter 48-1.

Controller 45, oscillator 46, multiplier 4
7-1 and the high-pass filter 48-1 call a terminal accommodated in the terminal-side device 5 and, when the terminal is off-hook, change the terminal type according to a frequency not used by any of the telephone terminal and the non-telephone terminal. An incoming call notification means for notifying the mobile device 7 is configured.

Further, the terminal-side device 5 serves as a high-pass filter 48-2 as a terminal-selection-notice detecting means for detecting a terminal-selection-notification notification from the mobile-unit-side device 7 at a frequency not used by any of the telephone terminal and non-telephone terminal. , Multiplier 4
7-2 and a low-pass filter 49, and the controller 45 is provided with a called terminal selecting means for selecting a called terminal according to the detection output of this means.

When the subscriber line interface circuits 41-1 to 41-3 to which each terminal is directly connected detect an on-hook signal of the terminal, the circuit notifies the controller 45 of the signal. The controller 45 analyzes the notified signal,
Switch 4 to connect the off-hook terminal to the line
On / off of 2-1 and 42-2 is controlled. As a result, a signal from the terminal is transmitted to the two-wire transmission line 6 via the corresponding subscriber line interface circuit, switch 42-1, low-pass filter 43-1 and two-wire to four-wire converter 44. A signal from the two-wire transmission line 6 to the terminal is transmitted to a two-wire / four-wire converter 44, a low-pass filter 43-2,
It is transmitted via the switch 42-2 and the corresponding subscriber line interface circuit.

The controller 45 also includes a switch 42-
In order to notify the mobile unit-side device 7 of the signals notified from the subscriber line interface circuits 41-1 to 41-3 at the same time as the control of the terminals 1 and 42-2, the terminal identification signal is multiplied by the multiplier 47-1.
Output to At this time, the center frequency of the terminal identification signal is A
And The multiplier 47-1 outputs the terminal identification signal to the oscillator 4
6 multiplied by the unmodulated carrier signal of center frequency B. The unmodulated carrier signal generated by the oscillator 46 is set so that the frequency A + B is a signal outside the frequency band used by each terminal. The multiplied signal includes a signal component having a center frequency of A + B and a signal component having a center frequency of AB. Center frequency A
For the -B signal component, the high-pass filter 48-1
To remove. The signal having the center frequency of A + B is transmitted from the two-wire to four-wire converter 51 to the two-wire transmission line 6 together with the signal transmitted through the switch 42-1 and the low-pass filter 43-1.

At the time of receiving a call to the terminal, an incoming call notification at a frequency A + B that is not used by either the telephone terminal or the non-telephone terminal is input from the mobile device 7 via the two-wire transmission path 6. This incoming notification is sent to the high-pass filter 48-
2 and is multiplied by the unmodulated carrier signal of the center frequency B from the oscillator 46 in the multiplier 47-2. As a result, a signal component having a center frequency of A + 2B and a signal component having a center frequency of A are generated. The signal component of the center frequency A is extracted by the low-pass filter 49 and transmitted to the controller 45. The controller 45 analyzes the signal of the center frequency A, and controls the switches 42-1 and 42-2 so that the corresponding terminal is connected to the line. As a result, the signal arriving at the two-wire to four-wire converter 44 from the two-wire transmission line 6 is filtered out of the out-of-band signal by the low-pass filter 43-2, and the corresponding subscriber line input via the switch 42-2. It is sent to the face circuit (any of 41-1 to 41-3) and further to a terminal connected thereto.

FIG. 5 is a block diagram showing the details of the mobile unit 7. Here, a case where the mobile device 7 is connected to the mobile device via the private branch exchange 60 will be described as an example.

The mobile device 7 includes a high-pass filter 55-1, an oscillator 56, a multiplier 57-1 and a low-pass filter 58 as notification detecting means for detecting a notification based on the frequency A + B. Switches 53-1, 53-2, network control devices 54-1 to 54-3, and a controller 59 are provided as connection control means for connecting to the exchange 60.

The switches 53-1 and 53-2 and the controller 59 are also provided with low-pass filters 52-1 and 52-.
2 together with incoming connection means for detecting incoming calls to the network control devices 54-1 to 54-3 and connecting them to the terminal device 5. The controller 59 and the oscillator 56 also include a multiplier 57-2 and a high-pass filter 55-2.
At the same time, a terminal selection notifying means for notifying the terminal device 5 of information for selecting a terminal by using a frequency A + B not used by any of the telephone terminal and the non-telephone terminal is configured.

The signal transmitted from the terminal device 5 via the two-wire transmission line 6 is input from the two-wire / four-wire converter 51 to the low-pass filter 52-1 and the high-pass filter 55-1. The signal that has passed through the high-pass filter 55-1 has its in-band signal removed, and the frequency A + B
If there is a signal, the signal is extracted. When this signal is multiplied by the multiplier 57-1 by the invariable carrier signal of the center frequency B generated by the oscillator 56, the center frequency becomes A +
A 2B signal component and a signal component whose center frequency is A are generated. The signal component of the center frequency A is extracted by the low-pass filter 58 and transmitted to the controller 59. The controller 59 analyzes the signal of the center frequency A, and controls the switches 53-1 and 53-2 such that the corresponding one of the network controllers 54-1 to 54-3 is connected to the terminal. .

As a result, the signal arriving at the two-wire to four-wire converter 51 from the two-wire transmission line 6 is converted to a low-pass filter 52-1.
, The signal outside the band is removed and transmitted to the corresponding network control device (any of 54-1 to 54-3) via the switch 53-1. The signal from the line at that time is sent from the network control device to the two-wire transmission line 6 via the switch 53-2, the low-pass filter 52-2, and the two-wire to four-wire converter 51.

The mobile device 7 also sends out information for selecting a terminal to the terminal device 5 when a call is received. To identify the calling terminal, the individual terminals must be
1 to 54-3, but it is also possible to adopt a configuration in which the terminal identification signal of the calling terminal is obtained from the radio base station 9 via the mobile station 8, and furthermore, in this case via the private branch exchange 60. it can.

In any case, the controller 59 analyzes the notifications from the network controllers 54-1 to 54-3, controls the switches 53-1 and 53-2, and transmits information for selecting a terminal to the center frequency. A outputs to the multiplier 57-2. Multiplier 57-2 multiplies the signal by the unmodulated carrier signal of center frequency B from oscillator 56. The multiplied signal includes a signal component having a center frequency of A + B and AB
And the signal component of AB is removed by the high-pass filter 55-2. The remaining signal of the center frequency A + B, together with the signal from the network controller,
The signal is transmitted to the two-wire transmission line 6 via the two-wire / four-wire converter 51.

FIG. 6 shows an example of an operation sequence.
An example in which a terminal of a general telephone network makes a call and calls a facsimile apparatus of a mobile station will be described. In a general telephone network, there is no need to distinguish whether a terminal is a telephone terminal or a non-telephone terminal, and it is not possible to know the type of terminal on the calling side. Therefore, in this case, a terminal identification signal is transmitted from the called terminal.

That is, when the communication line between the terminal of the general telephone network and the mobile unit is set up via the switching center and the radio base station, the mobile unit issues a ring tone transmission command to the mobile unit. Send out. This command is relayed from the mobile device to the terminal device, and the terminal device sends a ring tone to the corresponding terminal. Up to here, the operation is performed in the telephone mode.

The facsimile apparatus which has detected the ring tone is started manually or automatically, and goes off-hook.
The terminal device detects this off-hook and switches the switch, and since the terminal is a facsimile device, the mobile device side transmits a terminal identification signal indicating that the terminal is a facsimile device to the frequency used in the facsimile. Transmit using a frequency other than the band. The mobile device detects the FAX mode from the terminal identification signal and switches the switch in the device. As a result, the mobile station also knows that it is in the FAX mode, notifies the radio base station of the FAX mode using the control field of the communication line, and switches between the internal codec and the FAX interface. The wireless base station detects the FAX mode based on the notification from the mobile device, and determines the codec and F
Switch to AX interface. Further, the radio base station notifies the mobile device of the completion of the switching using the control field.

FIG. 7 is a diagram showing another example of the operation sequence, in which a facsimile apparatus of one mobile station calls a facsimile apparatus of another mobile station.

The setting of the communication line between the calling side mobile station and the called side mobile station is completed via the calling side radio base station, the switching center and the called side radio base station, When the calling terminal is activated, the calling terminal detects the off-hook of the facsimile device, switches a switch in the device, and uses a frequency other than the frequency band used by the facsimile to identify the terminal. Is sent. The mobile device on the calling side detects a terminal identification signal from the terminal device and switches a switch in the device. The calling side mobile device knows that the facsimile apparatus has been started, and switches between the codec and the FAX interface based on notifying the radio base station that the call connection is in the FAX mode using the control field. . The calling radio base station knows that it is in the FAX mode by the notification from the mobile device, and switches between the codec and the FAX interface.
The switching completion is notified to the calling mobile station.

When the called radio base station detects the FAX mode, it notifies the called mobile station of the FAX mode and switches between the codec and the FAX interface. The called mobile station detects that it is in the FAX mode, sends a ring tone transmission command to the mobile device, switches between the codec and the FAX interface, and notifies the called base station of the completion of the switching. Notice. When the receiving-side mobile device detects the FAX mode, it switches a switch in the device and transmits a terminal identification signal using a frequency outside the frequency band used for facsimile. Upon detecting the FAX mode, the called terminal device switches a switch in the device and sends a ring tone to the called facsimile machine.

FIG. 8 is a diagram showing an example of use of the present invention, in which the present invention is applied to a ship telephone.

In this example, a private branch exchange 82 is connected to the digital mobile unit 81, and telephones 83-1 and 83-2 and a mobile unit side device 84 are connected to the private branch exchange 82. A terminal device 86 is connected to the mobile device 84 via a two-wire transmission line 85, and a telephone 87, a facsimile device 88 and a personal computer 89 are connected to the terminal device 86.

In a conventional analog marine telephone, a plurality of terminals are connected to a network controller through a two-wire telephone interface, and are switched by the network controller to connect to a mobile unit. However, this does not allow the mobile station to identify which terminal went off-hook. If a new control line is laid, it is possible to identify the terminal type by the conventional method.However, when a two-wire transmission line is embedded in the wall of a ship, a new transmission line must be laid. Is often difficult and can require enormous costs and time.

Therefore, two devices constituting the terminal identification device of the present invention are connected to both ends of an existing two-wire transmission line. As a result, the equipment can be easily changed to the digital system.

[0042]

As described above, the terminal identification device and the digital mobile communication device according to the present invention connect a mobile terminal connected via a two-wire transmission line to a plurality of terminals, and the mobile terminal is connected to the mobile terminal. The user can know the type of the terminal. INDUSTRIAL APPLICABILITY The present invention is effective in digitizing a conventional analog mobile phone using a two-wire transmission line, particularly a marine phone.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a digital mobile communication device according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration example of a mobile device.

FIG. 3 is a block diagram showing a configuration example of a wireless base station.

FIG. 4 is a block diagram showing a configuration example of a terminal device.

FIG. 5 is a block diagram showing a configuration example of a mobile device.

FIG. 6 is a diagram showing an operation sequence example.

FIG. 7 is a diagram showing an example of an operation sequence.

FIG. 8 is a diagram showing an example in which the present invention is applied to a ship telephone.

[Explanation of symbols]

1, 11, 83-1, 83-2, 87 Telephone 2, 12, 88 Facsimile machine 3, 13, 89 Personal computer 4 Terminal identification device 5, 86 Terminal device 6, 85 Two-wire transmission path 7, 84 Move Machine side device 8 Mobile device 9 Radio base station 10 General telephone switching network 21, 33 High-efficiency voice codec 22, 23, 34, 35 Non-telephone interface 24, 32 Interface switch 25, 31 Transceiver 36 Line switch 41-1 41-3 Subscriber line interface circuits 42-1, 42-2, 53-1 and 53-2 Switches 43-1, 43-2, 49, 52-1, 52-2 and 58
Low-pass filter 44, 51 Two-wire to four-wire converter 45, 59 Controller 46, 56 Oscillator 47-1, 47-2, 57-1, 57-2 Multiplier 48-1, 48-2, 55-1, 55- 2 High-pass filter 54-1 to 54-3 Network control device 60, 82 Private branch exchange 81 Digital mobile device

──────────────────────────────────────────────────続 き Continuation of front page (72) Eiji Hagiwara, inventor NTT Mobile Communication Network Co., Ltd. 2-1-1 Toranomon, Minato-ku, Tokyo (56) References JP-A-2-194740 (JP) JP-A-60-64564 (JP, A) JP-A-63-285059 (JP, A) JP-A-1-147933 (JP, A) JP-A-3-143955 (JP, A) (58) Field surveyed (Int.Cl. ⁷ , DB name) H04B ^7/ 24-7/26 H04Q ⁷ /00-7/38 H04M 11/00-11/10 H04N 1/32-1/36 H04N 1/42- 1/44

Claims (4)

(57) [Claims] 1. A high-efficiency voice codec and a non-telephone signal relay depending on a terminal type of a call-connected terminal being a telephone terminal for voice communication or a non-telephone terminal generating a non-telephone signal other than voice. a first device connected to the transmission device to switch the interface off Esu circuit transmitting signals, the first device is connected via a two-wire transmission path, receiving one or more telephone terminals and non-telephone terminal A second device for detecting a call from the accommodated terminal; a connection device for connecting the call terminal to the first device; and a call terminal. Notification means for notifying the first device of the terminal type of the first device using a frequency not used by any of the telephone terminal and the non-telephone terminal, wherein the first device detects notification by the frequency; and Noticed Terminal identification device and a connection control means for connecting between the transmission device I. 2. The first device detects an incoming call to the connection control means and connects the incoming connection to the second device, and transmits information for selecting a terminal to and from the telephone terminal. A terminal selection notifying unit that notifies the second device by a frequency that is not used by any of the telephone terminals, wherein the second device detects a notification from the terminal selection notifying unit; 2. The terminal identification device according to claim 1, further comprising: a called terminal selecting unit that selects a called terminal according to a detection output of the terminal selection notification detecting unit. 3. The incoming call notifying means for notifying the first device of the type of the incoming call terminal when the off-hook of the incoming call terminal is performed by a frequency not used by any of the telephone terminal and the non-telephone terminal. The terminal identification device according to claim 2, comprising: 4. A mobile station connected to a telephone terminal for voice communication and a non-telephone terminal for generating non-telephone signals other than voice, and a radio base station to which the mobile station is wirelessly connected. A mobile station and the radio base station, a high-efficiency voice codec for voice communication, a non-telephone signal relay interface circuit for transmitting non-telephone signals, the high-efficiency voice codec and the non-telephone signal relay interface Switching means for switching between a circuit and a circuit, wherein the mobile station includes means for identifying whether the calling terminal is a telephone terminal or a non-telephone terminal, and radio notifying means for notifying the radio base station of the identification result. A digital mobile communication device including a means for controlling the switching means of the wireless base station in accordance with a notification from the mobile device; To a digital mobile communication apparatus characterized by being connected through the terminal identification device according to any one of 3.