Line control device, line control method, and program

Abstract

To provide a line control device, a line control method, and a program for connecting a voice line by automatic call control without performing incoming and outgoing call operations when using VoIP-GW (ODT).SOLUTION: In an air traffic control system, a line control device 104 includes a communication control unit that outputs an SS line ON signal to a first gateway device 105 connected to a first transmission device 103 when the line control device 104 is powered on. The communication control unit outputs, to the first gateway device 105, a dial signal for controlling an outgoing call to a second gateway device 205 connected to a second transmission device 203 when the first gateway device 105 outputs a predetermined response signal to the line control device 104.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a line control device, a line control method, and a program.

Background Art

[0002] In recent years, an air traffic control system has been known (see, for example, Patent Document 1). In the air traffic control system, wireless communication with an aircraft is performed by wireless communication equipment installed at a remote location. Such wireless communication equipment and the air traffic control system are connected by signal lines for voice signals and contact signals via a transmission device. The transmission devices are connected by a 4W analog dedicated line, and voice signals and contact signals are always transferred between the transmission devices.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in order to change the line from a 4W analog dedicated line to an Ethernet line without changing the interface specification (4W analog signal) between the transmission devices, it is necessary to change the line using a VoIP gateway compatible with the OD trunk interface.

[0005] Therefore, it is desired to provide a technology that enables connection of a voice line by automatic call control without performing call origination and termination operations when using a VoIP gateway compatible with the OD trunk interface (hereinafter, VoIP-GW(ODT)).

Means for Solving the Problems

[0006] In order to solve the above problems, according to one aspect of the present invention, there is provided a line control device including a communication control unit that outputs an on signal for an SS line to a first gateway device connected to a first transmission device based on the power supply of the line control device being turned on. The communication control unit outputs a dial signal for controlling a call to a second gateway device connected to a second transmission device to the first gateway device based on a predetermined response signal for the line control device being output by the first gateway device.

[0007] When the communication control unit does not acquire an on signal for an SR line output from the first gateway device for a predetermined time or more based on the completion of reception of the dial signal, the communication control unit outputs an off signal for the SS line to the first gateway device, outputs the on signal for the SS line to the first gateway device again, and may output the dial signal to the first gateway device based on the predetermined response signal for the line control device being output by the first gateway device.

[0008] When the communication control unit acquires an off signal for an SR line from the first gateway device based on a failure occurring in the line connecting the first gateway device and the second gateway device, the communication control unit outputs an off signal for the SS line to the first gateway device, outputs the on signal for the SS line to the first gateway device again, and may output the dial signal to the first gateway device based on the predetermined response signal for the line control device being output again by the first gateway device.

[0009] When the communication control unit obtains an off signal of the SR line from the first gateway device based on the occurrence of a failure in another line control device connected to the second gateway device, the communication control unit outputs an off signal of the SS line to the first gateway device, outputs an on signal of the SS line to the first gateway device again, and based on the fact that the first gateway device outputs the predetermined response signal to the line control device again, the communication control unit may output the dial signal to the first gateway device.

[0010] When the communication control unit outputs an off signal of the SS line to the first gateway device based on the occurrence of a failure in the line control device, and obtains an off signal of the SR signal from the first gateway device based on the off signal of the SS line, the communication control unit outputs an on signal of the SS line to the first gateway device again, and based on the fact that the first gateway device outputs the predetermined response signal to the line control device again, the communication control unit may output the dial signal to the first gateway device.

[0011] The predetermined response signal may be a wink signal of the SR line.

[0012] The predetermined response signal may be a tone dial signal of the receiving signal line.

[0013] According to another aspect of the present invention, there is provided a line control method by a line control device, including outputting an on signal of an SS line to a first gateway device connected to a first transmission device based on the power-on of the line control device, and outputting a dial signal for controlling a call to a second gateway device connected to a second transmission device to the first gateway device based on the fact that the first gateway device outputs a predetermined response signal to the line control device.

[0014] According to another aspect of the present invention, a computer is provided as a line control device including a communication control unit that outputs an on signal for an SS line to a first gateway device connected to a first transmission device based on the power-on of the line control device, and the communication control unit outputs a dial signal for controlling a call to a second gateway device connected to a second transmission device to the first gateway device based on the output of a predetermined response signal for the line control device by the first gateway device.

[0015] According to another aspect of the present invention, there is provided a line control device including a communication control unit that outputs a predetermined response signal for a second gateway device when an on signal for an SR line is output from the second gateway device connected to a second transmission device based on call control by a first gateway device connected to a first transmission device, and an acquisition unit that acquires a dial signal output from the second gateway device based on the output of the predetermined response signal. , based on the fact that the dial signal is acquired by the acquisition unit, without outputting a signal for establishing a call connection to the second transmission device, the communication control unit outputs an SS line on-signal to the second gateway device. A line control device is provided.

[0016] According to another aspect of the present invention, there is provided a line control method by a line control device. When an on signal for an SR line is output from a second gateway device connected to a second transmission device based on call control by a first gateway device connected to a first transmission device, a predetermined response signal for the second gateway device is output, and based on the output of the predetermined response signal, a dial signal output from the second gateway device is acquired. , based on the fact that the dial signal is acquired, without outputting a signal for establishing a call connection to the second transmission device, and outputting an SS line on-signal to the second gateway device. A line control method including the above is provided.

[0017] Also, according to another aspect of the present invention, a computer is configured as a line control device that, based on call control by a first gateway device connected to a first transmission device, outputs a predetermined response signal to the second gateway device when an on signal of the SR line is output from the second gateway device connected to a second transmission device, and an acquisition unit that acquires a dial signal output from the second gateway device based on the output of the predetermined response signal. , based on the fact that the dial signal is acquired by the acquisition unit, without outputting a signal for establishing a call connection to the second transmission device, the communication control unit outputs an SS line on-signal to the second gateway device. A program for causing a computer to function as the line control device is provided.

Advantages of the Invention

[0018] As described above, according to the present invention, a technique is provided that enables connection of a voice line by automatic call control without performing incoming and outgoing call operations when using a VoIP-GW (ODT).

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Embodiments for Carrying Out the Invention

[0020] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification and the drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

[0021] Also, in the present specification and the drawings, a plurality of components having substantially the same functional configuration may be distinguished by attaching different numbers after the same reference numeral. However, when it is not necessary to particularly distinguish each of a plurality of components having substantially the same functional configuration, only the same reference numeral is attached. Also, similar components in different embodiments may be distinguished by attaching different alphabets after the same reference numeral. However, when it is not necessary to particularly distinguish each of similar components in different embodiments, only the same reference numeral is attached.

[0022] (0. Outline of the Embodiment) First, the outline of the embodiment of the present invention will be described.

[0023] FIG. 1 is a diagram showing an example of a conventional system configuration. As shown in FIG. 1, the conventional system 8 includes a control console 81, a wireless voice exchange control device 82, a transmission device 83, a transmission device 84, and a wireless communication device 85.

[0024] In the conventional system 8, the transfer of voice signals and contact signals (PTT signal, SQ signal) between the wireless voice exchange control device 82 and the wireless communication device 85 was performed via the transmission device 83 and the transmission device 84. Also, in the conventional system 8, the contact signals were transmitted after being superimposed on the voice signals, and the transmission device 83 and the transmission device 84 were connected only by a 4W analog dedicated line.

[0025] Figure 2 is a diagram showing another example of the conventional system configuration. As shown in Figure 2, the conventional system 9 includes a control desk 91A, a wired voice exchange control device 92A, a VoIP-GW (ODT) 93A, a VoIP-GW (ODT) 93B, a wired voice exchange control device 92B, and a control desk 91B.

[0026] In the conventional system 9, when wired communication is performed between office A and office B, the wired voice exchange control device 92A and the wired voice exchange control device 92B are connected by a 4W analog dedicated line. When changing the 4W analog dedicated line between the wired voice exchange control device 92A and the wired voice exchange control device 92B to an Ethernet line, the interfaces of the wired voice exchange control device 92A and the wired voice exchange control device 92B were changed to OD trunk interfaces.

[0027] To connect to an Ethernet line using the OD trunk interface, in addition to the 4W voice signal line, the wired voice exchange control device 92A and the VoIP-GW (ODT) 93A are connected by a control line (SS signal) and a monitoring line (SR signal). By controlling the SS signal and the SR signal according to the operator's outgoing operation or the incoming response operation at the incoming party, the voice line is connected and a call becomes possible.

[0028] In the conventional system 8 shown in FIG. 1, between the air traffic control system and the wireless communication device 85, there is no outgoing and incoming call operation, and it is necessary to always keep the voice line connected. Therefore, in order to connect to an Ethernet line using a VoIP-GW (ODT), it is desirable to perform call connection (line connection) between the VoIP-GWs (ODTs) and continue it by automatic outgoing call control. Also, even when the Ethernet line is disconnected due to a sudden line failure, device failure, maintenance, etc., and the call between the VoIP-GWs (ODTs) is disconnected, it is desirable to restore the call connection by automatic reconnection control without human intervention.

[0029] In an embodiment of the present invention, a line connection method is proposed for performing call connection between VoIP-GWs (ODTs) by automatic outgoing call and automatic response control without performing outgoing and incoming call operations. Further, in an embodiment of the present invention, a line reconnection method is proposed for performing call connection by automatic re-outgoing call and automatic response control when an Ethernet line failure or the like occurs and the call connection between the VoIP-GWs (ODTs) is disconnected.

[0030] Subsequently, an overview of an embodiment of the present invention was described.

[0031] (1. Details of the Embodiment) Details of an embodiment of the present invention will be described.

[0032] (1-1. Configuration of the System) First, a configuration example of the system according to an embodiment of the present invention will be described. FIG. 3 is a diagram showing a configuration example of the system according to an embodiment of the present invention.

[0033] The air traffic control system includes a control console (101) and a wireless voice exchange control device (102). The voice signal from the control console (101) is input to the wireless voice exchange control device (102), and the wireless voice exchange control device (102) outputs voice to the transmission device #1 (103) connected to the wireless communication device (202) selected by the control console (101).

[0034] In order to connect to a wireless communication device (202) installed at a remote location, the transmission device #1 (103) and the transmission device #2 (203) are installed opposite each other to transmit the outgoing voice signal (112), PTT signal (110), incoming voice signal (113), and SQ signal (111) from the wireless voice exchange control device (102) and the wireless communication device (202). The transmission device #1 (103) and the transmission device #2 (203) can be connected by a 4W analog dedicated line (114, 214).

[0035] The transmission device #1 (103) and the transmission device #2 (203) are connected by a 4W analog dedicated line, and the voice signal and the contact signal are transmitted by a 4W analog signal (114, 214) in which the PTT signal and the SQ signal are superimposed on the voice signal. The outgoing voice signal (212) from the transmission device #2 (203) is transmitted to the wireless communication device (202), and a call with the airplane (201) can be made by the PTT signal (abbreviation for push-to-talk signal) (210) for transmission control.

[0036] The voice signal from the airplane (201) is transmitted to the transmission device #2 as an incoming voice signal (213) from the wireless communication device (202), and is transmitted to the transmission device #1 together with the SQ signal (abbreviation for squelch signal) (211) for reception control, and is transmitted to the control console (101) via the wireless voice exchange control device (102).

[0037] In order to change the 4W analog dedicated line connecting the transmission device #1 (103) and the transmission device #2 (203) to an Ethernet line, VoIP-GW (ODT) #1 (105) and VoIP-GW (ODT) #2 (205) are installed between the transmission device #1 (103) and the transmission device #2 (203), and the 4W analog signal is converted into an IP signal for transmission.

[0038] The VoIP-GW (ODT) is a VoIP gateway compatible with the OD trunk interface. By performing call control between VoIP-GWs (ODT), it enables voice communication using Ethernet lines. To perform call control, it is necessary to control the SS signal (control line) (115, 215) and the SR signal (monitoring line) (116, 216), and line control devices (104, 204) for controlling the SS signal (115, 215) and the SR signal (116, 216) are installed.

[0039] More specifically, the line control device (104) is the line control device (master), and the line control device (204) is the line control device (slave). The line control device (master) (104) performs automatic outgoing call processing, and the line control device (slave) (204) performs automatic answering processing.

[0040] The SS signal 1 (115) on the line control device (master) (104) side is used as an outgoing call signal, and the SR signal 1 (116) is used as a response signal indicating that a response has been made on the line control device (slave) (204) side and as a line connection signal to which the IP line is connected.

[0041] The SR signal 2 (216) on the line control device (slave) (204) side is used as an incoming call signal indicating that an outgoing call has been made on the line control device (master) (104) side and as a line connection signal to which the IP line is connected, and the SS signal 2 (215) is used as an incoming call response signal for an incoming call from the line control device (master) (104) side.

[0042] In the embodiment of the present invention, in the line control device (master) (104) and the line control device (slave) (204), by controlling and monitoring the SS signal and the SR signal with the VoIP-GW (ODT) to which each line control device is connected, automatic connection is enabled.

[0043] Furthermore, in the embodiment of the present invention, it is possible to detect a line break by monitoring the SR signal on both the line control device (master) (104) side and the line control device (slave) (204) side. Also, in the embodiment of the present invention, when a line break is detected, the line is once set to the clear state (idle state), and then transmission control is performed again from the line control device (master) (104) side to enable automatic reconnection.

[0044] The configuration example of the system according to the embodiment of the present invention has been described above.

[0045] (1-2. Functional Configuration of Line Control Device (Master)) Subsequently, a functional configuration example of the line control device (master) (104) according to the embodiment of the present invention will be described. FIG. 4 is a diagram showing a functional configuration example of the line control device (master) (104) according to the embodiment of the present invention. As shown in FIG. 4, the line control device (master) (104) includes a control unit (104a), a storage unit (104d), and a communication unit (104e).

[0046] The control unit (104a) includes a CPU (Central Processing Unit) and the like, and its functions can be realized by the program stored in the storage unit (104d) being expanded and executed by the CPU in the RAM (Random Access Memory). At this time, a computer-readable recording medium recording the program may also be provided. Alternatively, the control unit (104a) may be configured by dedicated hardware or by a combination of multiple hardware components.

[0047] Here, as shown in FIG. 4, the control unit (104a) includes an acquisition unit (104b) and a communication control unit (104c). Details of each of these functional units included in the control unit (104a) will be described later.

[0048] The storage unit (104d) is a storage device capable of storing programs and data for operating the control unit (104a). Also, the storage unit (104d) can temporarily store various data required during the operation of the control unit (104a). For example, the storage device may be a non-volatile storage device.

[0049] The communication unit (104e) is constituted by a communication interface and communicates with the VoIP-GW (ODT) #1 (105).

[0050] The functional configuration of the line control device (master) (104) according to the embodiment of the present invention has been described above.

[0051] (1-3. Functional Configuration of Line Control Device (Slave)) Subsequently, an example of the functional configuration of the line control device (slave) (204) according to the embodiment of the present invention will be described. FIG. 5 is a diagram showing an example of the functional configuration of the line control device (slave) (204) according to the embodiment of the present invention. As shown in FIG. 5, the line control device (slave) (204) includes a control unit (204a), a storage unit (204d), and a communication unit (204e).

[0052] The control unit (204a) includes a CPU (Central Processing Unit) and the like, and its functions can be realized by the program stored in the storage unit (204d) being expanded and executed in the RAM (Random Access Memory) by the CPU. At this time, a computer-readable recording medium storing the program may also be provided. Alternatively, the control unit (204a) may be constituted by dedicated hardware or may be constituted by a combination of a plurality of hardware.

[0053] Here, as shown in FIG. 5, the control unit (204a) includes an acquisition unit (204b) and a communication control unit (204c). Details of these functional units included in the control unit (204a) will be described later.

[0054] The memory unit (204d) is a memory device capable of storing programs and data for operating the control unit (204a). Also, the memory unit (204d) can temporarily store various data required during the operation of the control unit (204a). For example, the memory device may be a non-volatile memory device.

[0055] The communication unit (204e) is constituted by a communication interface and communicates with the VoIP-GW (ODT) #2 (205).

[0056] The functional configuration of the line control device (slave) (204) according to the embodiment of the present invention has been described above.

[0057] (1-4. System Operation) Subsequently, an operation example of the system according to the embodiment of the present invention will be described. As an example of the system operation, the detailed operation of automatic connection control and the detailed operation of automatic reconnection control when a failure occurs and the line is disconnected will be described.

[0058] (Automatic Connection Control) FIG. 6 is a diagram showing the sequence of basic automatic connection control according to the embodiment of the present invention. In the embodiment of the present invention, automatic connection is enabled by controlling the SS signal and the SR signal for the VoIP-GW (ODT) in the line control device.

[0059] The operation of the line control device consists of two operations: a master operation and a slave operation. The master operation is an operation that automatically performs call control when the power is turned on, and the master side serves as the starting point to connect the line. The slave operation starts in a state of waiting for an incoming call from the master side when the power is turned on, and automatically responds when an incoming call is detected. The basic line connection operation in FIG. 6 will be described.

[0060] In the line control device (master) (104), the automatic transmission process (S301) operates when the power is turned on (when the power supply is activated). The communication control unit (104c) outputs the SS signal 1 (S401) in the [ON] state to the VoIP-GW (ODT) #1 (105) based on the power-on activation and performs transmission control.

[0061] When the VoIP-GW (ODT) #1 (105) detects the SS signal 1 (S401) from the line control device (master) (104), it outputs an [ON / OFF] pulse signal (wink signal) of the SR signal 1 (S402) to the line control device (master) (104). Here, the wink start method is adopted for the transfer of dial information. However, as will be described later, other methods may be adopted for the transfer of dial information.

[0062] In the line control device (master) (104), the acquisition unit 104b acquires the wink signal from the VoIP-GW (ODT) #1 (105). Based on the acquisition of the wink signal by the acquisition unit 104b, the communication control unit 104c outputs the dial signal 1 (S403) to the VoIP-GW (ODT) #1 (105). The dial signal 1 (S403) may be either a PB signal (push button signal) or a DP signal (dial pulse signal).

[0063] Based on receiving the dial signal 1 (S403) from the line control device (master) (104), the VoIP-GW (ODT) #1 (105) makes a call (S421) to the VoIP-GW (ODT) #2 (205) which is the connection destination.

[0064] The line control device (slave) (204) transitions to the incoming call waiting (SR signal waiting) state from the master side immediately after the power is turned on. When the VoIP-GW (ODT) #2 (205) receives the call control (S421) from the VoIP-GW (ODT) #1 (105), it outputs the SR signal 2 (S411) in the [ON] state to the line control device (slave) (204).

[0065] In the line control device (slave) (204), the acquisition unit 204b acquires the SR signal 2 (S411) from the VoIP-GW (ODT) #2 (205). Then, based on the acquisition of the SR signal 2 (S411) by the acquisition unit 204b, the communication control unit 204c outputs an [ON / OFF] pulse signal (wink signal) of the SS signal 2 (S412) to the VoIP-GW (ODT) #2 (205).

[0066] After receiving the wink signal from the line control device (slave) (204), the VoIP-GW (ODT) #2 (205) outputs the dial signal 2 (S413) to the line control device (slave) (204). Then, the VoIP-GW (ODT) #2 (205) notifies the VoIP-GW (ODT) #1 (105) of the call acceptance completion (S422).

[0067] In the line control device (slave) (204), the acquisition unit 204b acquires the dial signal 2 (S413) from the VoIP-GW (ODT) #2 (205). Then, based on the acquisition of the dial signal 2 (S413) by the acquisition unit 204b, the communication control unit 204c outputs the SS signal 2 (S414) in the [ON] state to the VoIP-GW (ODT) #2 (205).

[0068] When the VoIP-GW (ODT) #2 (205) detects the SS signal 2 (S414) from the line control device (slave) (204), it performs response control on the VoIP-GW (ODT) #1 (105). The response control includes the output of the incoming call response (S423). The VoIP-GW (ODT) #1 (105) outputs the SR signal 1 (S404) in the [ON] state to the line control device (master) (104) by the response control from the VoIP-GW (ODT) #2 (205). The VoIP-GW (ODT) #1 (105) outputs the incoming call response reception completion (S424) to the VoIP-GW (ODT) #2 (205).

[0069] The line control device (master) (104) recognizes that the call connection has been completed by detecting the SR signal 1 (S404) from the VoIP-GW (ODT) #1 (105), and ends the automatic outgoing call process. When the call connection is completed, 4W analog audio is always connected between the transmission device #1 (103) and the transmission device #2 (203) via the VoIP-GW (ODT) (S425), enabling communication of voice signals, PTT signals, and SQ signals.

[0070] (Redial connection) Figure 7 is a diagram showing the redial connection sequence when the slave side has not yet started up at the time of master side startup. The line reconnection operation in Figure 7 will be described. The operation of the line control device (master) (104) from power-on startup to the output of the dial signal 1 (S403) is the same as the basic line connection operation (Figure 6).

[0071] After the line control device (master) (104) outputs the dial signal 1 (S403), it starts the [T1] timer (S405) and monitors the time until a response signal from the slave side is detected. The monitoring time (predetermined time) set in the [T1] timer may be set in advance to any fixed time. Although it is necessary to set an appropriate time according to the system to be used for the monitoring time, since it is necessary to consider the network situation, it is necessary to set the time in the order of several seconds.

[0072] In the line control device (master) (104), if the response signal from the slave side is not acquired by the acquisition unit 104b even after the monitoring time has elapsed, the communication control unit 104c determines that the line connection has not been completed, turns off the SS signal 1 (S406), and sets the line state to the idle state (S406). When the SS signal 1 (S406) is turned off, the VoIP-GW (ODT) #1 (105) disconnects the line (S426), and the VoIP-GW (ODT) #2 (205) turns off the SS signal 1 (S416).

[0073] The line control device (master) (104) activates the [T2] timer (S407) after setting the line state to the idle state, and after the [T2] time has elapsed, it operates the retransmission process (S302). The retransmission process (S302) includes S431 - S433 and S427. However, S431 - S433 and S427 are the same processes as S401 - S403 and S421 included in the automatic transmission process S301.

[0074] If the slave side has been activated before the retransmission process (S302), the line is connected by the automatic response process of the line control device (slave) (204), enabling communication of voice signals, PTT signals, and SQ signals between the transmission device #1 (103) and the transmission device #2 (203). The retransmission process (S302) from the master side is repeated until the slave side is activated.

[0075] (Occurrence of line failure) Figure 8 is a diagram showing the reconnection sequence when a line failure occurs. The reconnection operation at the time of line disconnection in Figure 8 will be described.

[0076] When the network line between the VoIP - GW (ODT)s is disconnected, the VoIP - GW (ODT) #1 (105) turns off the SR signal 1 (S408) to the line control device (master) (104).

[0077] In the line control device (master) (104), when the acquisition unit 104b acquires the OFF state of the SR signal 1 (S408) from the VoIP - GW (ODT) #1 (105), the communication control unit 104c turns off the SS signal 1 (S406) to the VoIP - GW (ODT) #1 (105), sets the line state to the idle state, activates the [T2] timer (S407), and transitions to the retransmission process (S302) waiting state.

[0078] When the network line between the VoIP - GW (ODT)s is disconnected, the VoIP - GW (ODT) #2 (205) similarly turns off the SR signal 2 (S416) to the line control device (slave) (204).

[0079] In the line control device (slave) (204), when the acquisition unit 204b acquires the [OFF] of the SR signal 2 (S416) from the VoIP-GW (ODT) #2 (205), the communication control unit 204c sets the SS signal 2 (S418) to the VoIP-GW (ODT) #2 (205) to [OFF], sets the line state to the idle state, and then transitions to the incoming call waiting state from the master side.

[0080] After the [T2] time has elapsed, the line control device (master) (104) operates the retransmission process (S302). When the slave side automatically answers, the line is reconnected again, and voice signals, PTT signals, and SQ signals can be communicated between the transmission device #1 (103) and the transmission device #2 (203).

[0081] (Occurrence of a failure on the slave side) FIG. 9 is a diagram showing a reconnection sequence when a failure occurs on the slave side. The reconnection operation at the time of a slave side failure in FIG. 9 will be described.

[0082] When a failure occurs in the line control device (slave) (204), when the line control device (slave) is powered off, the SS signal 2 (S418) to the VoIP-GW (ODT) #2 (205) becomes [OFF]. When the VoIP-GW (ODT) #2 (205) detects the [OFF] of the SS signal 2 (S418) from the line control device (slave) (204), it performs a disconnection process on the VoIP-GW (ODT) #1 (105) (S461).

[0083] Based on the disconnection process from the VoIP-GW (ODT) #2 (205), the VoIP-GW (ODT) #1 (105) sets the SR signal 1 (S408) to the line control device (master) (104) to [OFF].

[0084] In the line control device (master) (104), when the acquisition unit 104b acquires the [OFF] of the SR signal 1 (S408) from the VoIP-GW (ODT) #1 (105), the communication control unit 104c sets the SS signal 1 (S406) to [OFF] for the VoIP-GW (ODT) #1 (105), sets the line state to the idle state, starts the [T2] timer, and transitions to the retransmission process (S302) waiting state.

[0085] When the VoIP-GW (ODT) #1 (105) detects the [OFF] of the SS signal 1 (S406) from the line control device (master) (104), it performs a disconnection process on the VoIP-GW (ODT) #2 (205) (S462). Based on the disconnection process from the VoIP-GW (ODT) #1 (105), the VoIP-GW (ODT) #2 (205) sets the SR signal 2 (S416) to [OFF] for the line control device (slave) (204) and sets the line state to the idle state.

[0086] When the failure of the line control device (slave) (204) is recovered and the power of the line control device (slave) (204) is restarted, the line control device (slave) (204) transitions to the incoming call response waiting state from the master side.

[0087] After the [T2] time has elapsed, the line control device (master) (104) operates the retransmission process (S302). When the slave side makes an automatic response, the line is reconnected again, and voice signals, PTT signals, and SQ signals can be communicated between the transmission device #1 (103) and the transmission device #2 (203).

[0088] (Failure occurrence on the master side) Figure 10 is a diagram showing the reconnection sequence when a failure occurs on the master side. The reconnection operation when a failure occurs on the master side in Figure 10 will be described.

[0089] When a failure occurs in the line control device (master) (104) and the power of the line control device (master) is turned off, the SS signal 1 (S406) to the VoIP-GW (ODT) #1 (105) becomes [OFF]. When the VoIP-GW (ODT) #1 (105) detects the [OFF] of the SS signal 1 (S406) from the line control device (master) (104), it performs a disconnection process on the VoIP-GW (ODT) #2 (205) (S461).

[0090] Based on the disconnection process from the VoIP-GW (ODT) #1 (105), the VoIP-GW (ODT) #2 (205) turns the SR signal 2 (S416) to the line control device (slave) (204) to [OFF]. In the line control device (slave) (204), when the acquisition unit 204b acquires the [OFF] of the SR signal 2 (S416) from the VoIP-GW (ODT) #2 (205), the communication control unit 204c turns the SS signal 2 (S418) to the VoIP-GW (ODT) #2 (205) to [OFF] and transitions to the incoming call response waiting state.

[0091] When the VoIP-GW (ODT) #2 (205) detects the [OFF] of the SS signal 2 (S418) from the line control device (slave) (204), it performs a disconnection process on the VoIP-GW (ODT) #1 (105) (S462). Based on the disconnection process from the VoIP-GW (ODT) #2 (205), the VoIP-GW (ODT) #1 (105) turns the SR signal 1 (S408) to the line control device (master) (104) to [OFF] and sets the line state to the idle state.

[0092] When the failure of the line control device (master) (104) is recovered and the power of the line control device (master) (104) is restarted, the retransmission process (S302) for the slave side operates. When the slave side makes an automatic response, the line is reconnected again, and voice signals, PTT signals, and SQ signals can be communicated between the transmission device #1 (103) and the transmission device #2 (203).

[0093] The operation example of the system according to the embodiment of the present invention has been described above.

[0094] (1-5. Effects) As described above, the system according to the embodiment of the present invention enables call connections between VoIP-GWs (ODTs) through automatic call and answer control without the need for dedicated call origination and termination operations. Furthermore, even if a failure occurs in the Ethernet line or line control device, the system according to the embodiment of the present invention enables automatic line connection by controlling and monitoring the SS and SR signals. This provides a significant advantage in terms of maintainability of voice lines in air traffic control systems.

[0095] Furthermore, the system according to an embodiment of the present invention is capable of reconnecting the line as soon as the failure is resolved, which minimizes the impact on operations and is expected to have an effect on reliability.

[0096] The effects achieved by the system according to the embodiment of the present invention have been described above.

[0097] (2. Hardware configuration example) Next, an example of the hardware configuration of the line control device (master) (104) according to the embodiment of the present invention will be described.

[0098] An example of the hardware configuration of an information processing device 900 will be described below as an example of the hardware configuration of a line control device (master) 104 according to an embodiment of the present invention. Note that the example of the hardware configuration of the information processing device 900 described below is merely an example of the hardware configuration of the line control device (master) 104. Therefore, the hardware configuration of the line control device (master) 104 may be such that unnecessary components are deleted from the hardware configuration of the information processing device 900 described below, or new components are added. Note that the hardware configuration of the line control device (slave) 204 may also be realized in the same manner as the hardware configuration of the line control device (master) 104.

[0099] FIG. 11 is a diagram showing the hardware configuration of an information processing apparatus 900 as an example of a line control apparatus (master) (104) according to an embodiment of the present invention. The information processing apparatus 900 includes a CPU (Central Processing Unit) 901, a ROM (Read Only Memory) 902, a RAM (Random Access Memory) 903, a host bus 904, a bridge 905, an external bus 906, an interface 907, an input device 908, an output device 909, a storage device 910, and a communication device 911.

[0100] The CPU 901 functions as an arithmetic processing unit and a control unit, and controls the overall operations within the information processing apparatus 900 according to various programs. Also, the CPU 901 may be a microprocessor. The ROM 902 stores programs, arithmetic parameters, etc. used by the CPU 901. The RAM 903 temporarily stores programs used in the execution of the CPU 901 and parameters that appropriately change during the execution. These are mutually connected by a host bus 904 composed of a CPU bus or the like.

[0101] The host bus 904 is connected to an external bus 906 such as a PCI (Peripheral Component Interconnect / Interface) bus via the bridge 905. Note that it is not necessarily required to separately configure the host bus 904, the bridge 905, and the external bus 906, and these functions may be implemented on one bus.

[0102] The input device 908 includes input means such as a mouse, a keyboard, a touch panel, buttons, a microphone, switches, and levers for a user to input information, and an input control circuit that generates an input signal based on the user's input and outputs it to the CPU 901. A user who operates the information processing apparatus 900 can input various data to the information processing apparatus 900 or instruct processing operations by operating this input device 908.

[0103] The output device 909 includes, for example, display devices such as a CRT (Cathode Ray Tube) display device, a liquid crystal display (LCD) device, an OLED (Organic Light Emitting Diode) device, a lamp, and audio output devices such as a speaker.

[0104] The storage device 910 is a device for storing data. The storage device 910 may include a storage medium, a recording device for recording data on the storage medium, a reading device for reading data from the storage medium, a deleting device for deleting data recorded on the storage medium, and the like. The storage device 910 is composed of, for example, an HDD (Hard Disk Drive). This storage device 910 drives a hard disk and stores programs and various data executed by the CPU 901.

[0105] The communication device 911 is a communication interface composed of, for example, a communication device for connecting to a network. The communication device 911 may support either wireless communication or wired communication.

[0106] The hardware configuration example of the line control device (master) (104) according to the embodiment of the present invention has been described above.

[0107] (3. Summary) As described above, the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that those having ordinary knowledge in the technical field to which the present invention pertains can conceive of various modification examples or correction examples within the scope of the technical idea described in the claims, and these are also naturally understood to belong to the technical scope of the present invention.

[0108] For example, in the above, the case where the system according to the embodiment of the present invention targets a wireless communication line in an air traffic control system has been mainly described. However, the system according to the embodiment of the present invention can be applied to any system using a 4W analog dedicated line.

[0109] Also, in the above description, the case where the wink start method is adopted for the transfer of dial information has been mainly described. However, the method of transferring dial information is not limited to the wink start method. For example, the method of transferring dial information may be a prepost start method or the like. In such a case, instead of the [ON / OFF] pulse signal (wink signal) of the SR signal, a tone dial signal of the receiving signal line may be used.

Explanation of Signs

[0110] 101 Control console 102 Wireless voice exchange control device 103 Transmission device 104 Line control device (master) 104b Acquisition unit 104c Communication control unit 105 VoIP-GW (ODT) 202 Wireless communication device 203 Transmission device 204 Line control device (slave) 204b Acquisition unit 204c Communication control unit 205 VoIP-GW (ODT)

Claims

1. A line control device, comprising a communication control unit that outputs an on signal for an SS line to a first gateway device connected to a first transmission device based on the power supply of the line control device being turned on; the communication control unit outputs a dial signal for controlling a call to a second gateway device connected to a second transmission device to the first gateway device based on a predetermined response signal for the line control device being output by the first gateway device; Line control device.

2. The communication control unit outputs an off signal for the SS line to the first gateway device and outputs an on signal for the SS line to the first gateway device again when an on signal for the SR line output from the first gateway device is not acquired for a predetermined time or more based on the completion of reception of the dial signal; outputs the dial signal to the first gateway device based on the predetermined response signal for the line control device being output by the first gateway device; The line control device according to claim 1.

3. The communication control unit outputs an off signal for the SS line to the first gateway device and outputs an on signal for the SS line to the first gateway device again when an off signal for the SR line is acquired from the first gateway device based on a failure occurring in the line connecting the first gateway device and the second gateway device; outputs the dial signal to the first gateway device based on the predetermined response signal for the line control device being output again by the first gateway device; The line control device according to claim 1.

4. The communication control unit outputs an off signal for the SS line to the first gateway device and outputs an on signal for the SS line to the first gateway device again when an off signal for the SR line is acquired from the first gateway device based on a failure occurring in another line control device connected to the second gateway device; outputs the dial signal to the first gateway device based on the predetermined response signal for the line control device being output again by the first gateway device; The line control device according to claim 1.

5. The communication control unit Based on the occurrence of a failure in the line control device, an off signal of the SS line is output to the first gateway device. When an off signal of the SR signal is acquired from the first gateway device based on the off signal of the SS line, the on signal of the SS line is output to the first gateway device again. Based on the fact that the predetermined response signal for the line control device is output again by the first gateway device, the dial signal is output to the first gateway device. The line control device according to claim 1.

6. The predetermined response signal is a wink signal of the SR line. The line control device according to any one of claims 1 to 5.

7. The predetermined response signal is a tone dial signal of the receiving signal line. The line control device according to any one of claims 1 to 5.

8. A line control method by a line control device, comprising: Based on the power-on of the line control device, outputting an on signal of the SS line to the first gateway device connected to the first transmission device; Based on the fact that a predetermined response signal for the line control device is output by the first gateway device, outputting a dial signal for controlling a call to the second gateway device connected to the second transmission device to the first gateway device; A line control method including the above.

9. A computer, A line control device, Comprising a communication control unit that outputs an on signal of the SS line to the first gateway device connected to the first transmission device based on the power-on of the line control device, The communication control unit, Based on the fact that a predetermined response signal for the line control device is output by the first gateway device, outputs a dial signal for controlling a call to the second gateway device connected to the second transmission device to the first gateway device. A program for functioning as a line control device.

10. A line control device, A communication control unit that outputs a predetermined response signal for the second gateway device when an on signal of the SR line is output from the second gateway device connected to the second transmission device based on call control by the first gateway device connected to the first transmission device; An acquisition unit that acquires a dial signal output from the second gateway device based on the output of the predetermined response signal. comprising Based on the acquisition of the dial signal by the acquisition unit, the communication control unit outputs an on signal for the SS line to the second gateway device without outputting a signal for establishing a call connection to the second transmission device. Line control device.

11. A line control method by a line control device, When an on signal for the SR line is output from a second gateway device connected to a second transmission device based on call control by a first gateway device connected to a first transmission device, output a predetermined response signal to the second gateway device; Based on the output of the predetermined response signal, acquire a dial signal output from the second gateway device; Based on the acquisition of the dial signal, output an on signal for the SS line to the second gateway device without outputting a signal for establishing a call connection to the second transmission device; A line control method including the above.

12. A computer, A line control device, A communication control unit that outputs a predetermined response signal to the second gateway device when an on signal for the SR line is output from the second gateway device connected to the second transmission device based on call control by the first gateway device connected to the first transmission device; An acquisition unit that acquires a dial signal output from the second gateway device based on the output of the predetermined response signal; comprising Based on the acquisition of the dial signal by the acquisition unit, the communication control unit outputs an on signal for the SS line to the second gateway device without outputting a signal for establishing a call connection to the second transmission device. A program for functioning as a line control device.

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