JP2021136644A - Voice switching control device and voice switching system - Google Patents

Abstract

To enable providing voice switching with high reliability.SOLUTION: A reception processing unit 402 receives a reception signal from a corresponding transmission processing unit in another voice switching subsystem. A route selection processing unit 403, on detecting abnormality in a transmission line, selects another transmission line among a plurality of transmission lines. A transmission line information generation unit 406 generates transmission line information which indicates an abnormality. A transmission processing unit 405 transmits a transmission signal, including the generated transmission line information, to the other voice switching subsystem, using the transmission line. A reception selector 404 switches a transmission line for reception to the other selected transmission line.SELECTED DRAWING: Figure 3

Description

The present invention relates to a voice exchange control device and a voice exchange system.

Conventionally, in air traffic control systems, wireless communication with aircraft and wired communication with related government offices have been performed. When performing this communication, voice exchange control for switching the connection path of the voice signal is performed. In the voice exchange system used in the air traffic control system, a plurality of voice exchange subsystems that perform voice exchange control are provided for each communication with the aircraft and each related government office. The voice exchange subsystems are connected so that they can communicate with each other.

In the voice exchange subsystem, the reliability and availability of voice exchange in the voice exchange subsystem are improved by making the voice exchange control device redundant.

Further, there is known a technique for making the communication path between redundant servers redundant and switchingable (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-177716

However, due to the recent increase in the scale of aircraft and hub airports handled by air traffic control systems, redundancy of connections between voice exchange subsystems is required. In this respect, although the voice exchange control in the voice exchange subsystem is made redundant, there is a problem that the transmission line between the voice exchange subsystems is not made redundant.

The present invention has been made in view of the above points, and an object of the present invention is to provide a voice exchange control device and a voice exchange system capable of providing highly reliable voice exchange.

The voice exchange control device according to the present invention is a voice exchange control device used in a voice exchange subsystem in which a voice exchange transmission line is redundantly configured, and is a reception processing unit, a route selection processing unit, and a transmission line information generation. The reception processing unit includes a unit, a transmission processing unit, and a switching unit, the reception processing unit receives a received signal from the voice exchange control device of another voice exchange subsystem, and the route selection processing unit receives the reception signal from the transmission line. When the abnormality is detected, another transmission line is selected from the plurality of transmission lines, the transmission line information generation unit generates transmission line information indicating the abnormality, and the transmission processing unit generates the transmission line information. The transmission signal including the transmission line information generated by the generation unit is transmitted to the other voice exchange subsystem using the transmission line, and the switching unit sets the transmission line received by the reception processing unit to the transmission line. It is configured to switch to the other transmission line selected by the route selection processing unit.

According to the communication device according to the present invention, the reception processing unit receives a received signal from the corresponding transmission processing unit in another voice exchange subsystem, detects an abnormality in the transmission line, and the route selection processing unit concerned. When an abnormality in a transmission line is detected, another transmission line is selected from a plurality of transmission lines.

Then, the transmission line information generation unit generates transmission line information indicating an abnormality, and the transmission processing unit uses the transmission line to transmit another transmission signal including the transmission line information generated by the transmission line information generation unit. It transmits to the voice exchange subsystem, and the switching unit switches the transmission line received by the reception processing unit to the other transmission line selected by the route selection processing unit.

In this way, when a received signal is received from the corresponding transmission processing unit in another voice exchange subsystem and an abnormality in the transmission line is detected, another transmission line is selected from the plurality of transmission lines to indicate the abnormality. The transmission line information is generated, the transmission signal including the generated transmission line information is transmitted to another voice exchange subsystem using the transmission line, and the receiving transmission line is switched to the selected other transmission line. This makes it possible to provide highly reliable voice exchange.

Further, the voice exchange system according to the present invention includes a plurality of voice exchange subsystems, and the voice exchange subsystem has a redundant configuration including a plurality of voice exchange control units, and is among the plurality of voice exchange subsystems. Communication is configured to be redundant.

Further, the voice exchange control unit of the voice exchange system according to the present invention includes a reception processing unit, a route selection processing unit, a transmission line information generation unit, a transmission processing unit, and a switching unit, and includes the voice exchange sub. The voice exchange control unit of the system and the voice exchange control unit of the other voice exchange subsystem are configured to be able to communicate using a plurality of transmission lines, and the reception processing unit is the other voice exchange sub. When a reception signal is received from the voice exchange control unit of the system and the route selection processing unit detects an abnormality in the transmission line, it selects another transmission line from the plurality of transmission lines and generates the transmission line information. The unit generates transmission line information indicating the state of the transmission line, and the transmission processing unit uses the transmission line to transmit a transmission signal including the transmission line information generated by the transmission line information generation unit to the other. The switching unit can switch the transmission line received by the reception processing unit to the other transmission line selected by the route selection processing unit.

According to the voice exchange system according to the present invention, the voice exchange control unit of the voice exchange subsystem and the voice exchange control unit of another voice exchange subsystem are configured to be communicable using a plurality of transmission lines and receive. The processing unit receives a received signal from the voice exchange control unit of another voice exchange subsystem, and the route selection processing unit selects another transmission line from a plurality of transmission lines when an abnormality in the transmission line is detected.

Then, the transmission line information generation unit generates transmission line information indicating the state of the transmission line, and the transmission processing unit transmits the transmission signal including the transmission line information generated by the transmission line information generation unit to the transmission line. It is used to transmit to another voice exchange subsystem, and the switching unit switches the transmission line received by the reception processing unit to the other transmission line selected by the route selection processing unit.

In this way, when a received signal is received from the voice exchange control unit of another voice exchange subsystem and an abnormality in the transmission line is detected, another transmission line is selected from a plurality of transmission lines and the state of the transmission line is shown. The transmission line information is generated, the transmission signal including the generated transmission line information is transmitted to another voice exchange subsystem using the transmission line, and the receiving transmission line is switched to the selected other transmission line. This makes it possible to provide highly reliable voice exchange.

Further, when the reception processing unit of the voice exchange system according to the present invention cannot normally receive a survival signal from the voice exchange control unit of the other voice exchange subsystem, it indicates that there is an abnormality in the transmission line. Can be detected.

Further, the survival signal of the voice exchange system according to the present invention can be a frame synchronization signal or a transmission clock signal.

Further, the reception processing unit of the voice exchange system according to the present invention receives a reception signal including the transmission line information from the voice exchange control unit of the other voice exchange subsystem, and based on the transmission line information. It is possible to detect that there is an abnormality in the transmission line.

In addition, the reception processing unit of the voice exchange system according to the present invention indicates a transmission abnormality indicating an abnormality related to transmission of the voice exchange control unit of the other voice exchange subsystem in the transmission line information, or the transmission line. When a terminal abnormality indicating that an abnormality has occurred is included, it is possible to detect that there is an abnormality in the transmission line.

Further, the transmission line information generation unit of the voice exchange system according to the present invention can generate transmission line information including the terminal abnormality when the transmission line information includes the transmission abnormality.

Further, the voice exchange system according to the present invention can be used in an air traffic control system. Therefore, it is possible to provide highly reliable voice exchange in the air traffic control system.

According to the voice control device and the voice exchange system of the present invention, highly reliable voice exchange can be provided.

It is a block diagram which shows the configuration example of the conventional voice exchange system. It is a block diagram which shows the schematic structure of the voice exchange system. It is a block diagram which shows the structure of the HWIF processing part of HWU. It is a flowchart which shows the route switching processing routine. It is a figure which shows the switching operation 1. It is a figure which shows the switching operation 2. It is a figure which shows the switching operation 3. It is a figure which shows the switching operation 4.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<Overview of the voice exchange system according to the embodiment of the present invention>
First, an outline of an embodiment of the present invention will be described.

In an air traffic control system, it has a voice exchange control unit for switching a connection path of a voice signal when performing wireless communication with an aircraft or wired communication with a related government office. In order to ensure highly reliable operation, the voice exchange control unit, which is the core of the system, is constructed in a redundant configuration. The system switching control unit that controls the operation switching between the voice exchange control unit and the voice exchange control unit, which have a redundant configuration, is called a voice exchange subsystem. In the voice exchange system according to the present invention, when constructing a large-scale system using two sets of voice exchange subsystems, a method of connecting the voice exchange subsystems with a duplicated transmission line and an abnormality in the connected transmission line occur. The present invention relates to a switching control method related to a transmission line automatic switching function for automatically switching transmission lines and continuing operation in the event of a failure.

FIG. 1 shows the system configuration of a conventional voice exchange system. In the voice exchange system in the conventional air traffic control system, the transmission line connecting the two types of voice exchange subsystems (# 1 and # 2) in which the voice exchange control unit is constructed in a redundant configuration is unified. The voice exchange control unit in the voice exchange subsystem operates in either the "operation system" (No. 1) in the operating state or the "standby system" (No. 2) in the standby state.

The operating state of the "operating system" and "standby system" is determined by the instruction of the system switching control unit in the voice exchange subsystem. The system switching control unit is implemented for each voice exchange subsystem. As for the signal flow between the voice exchange subsystems, the information from the voice exchange control unit in the active system state is taken in by the voice exchange control unit of the operation system and the standby system of the opposite voice exchange subsystem. Here, the information from the voice exchange control unit in the standby system state is not transmitted to the opposite voice exchange subsystem.

Each voice exchange control unit in the voice exchange subsystem is equipped with a highway interface unit (hereinafter, HWU) that connects the voice exchange subsystems. The information from the HWU of the two sets of voice exchange control units is taken into the highway interface changeover switch (hereinafter, HWSW).

The HWSW transmits information from the operation system voice exchange control unit to the opposite HWSW by the operation switching signal from the system switching control unit. Information from the opposite HWSW is transmitted to the HWU of the active voice exchange control unit and the standby voice exchange control unit.

Due to the recent increase in the scale of aircraft and hub airports handled by air traffic control systems, redundancy of voice exchange subsystems is required. However, since the transmission line connecting the voice exchange subsystems of the conventional air control system is unified, if a failure occurs in the transmission line, the communication between the voice exchange subsystems is interrupted, so that the voice exchange sub It was a system that could not communicate across systems and was supported by a reduced operation.

The voice exchange system according to the present invention enables transmission line connections between voice exchange subsystems to be connected in a duplicate configuration in order to avoid system shrinkage even when an abnormality occurs in the transmission line, and is further used in operation. This is to realize an automatic transmission line switching control method that automatically switches the transmission line instantly and enables continuous operation when an abnormality occurs in the existing transmission line.

<Configuration of voice exchange system according to the embodiment of the present invention>
Next, the configuration of the voice exchange system 10 according to the embodiment of the present invention will be described with reference to FIG. FIG. 2 is a block diagram showing a configuration of a voice exchange system 10 according to an embodiment of the present invention. In the present embodiment, the voice exchange system 10 will be described as an example when it is used in an air traffic control system.

As shown in FIG. 2, the voice exchange system 10 includes a voice exchange subsystem (# 1) 101, a voice exchange subsystem (# 2) 201, HWSW (route 1) 301, and HWSW (route 2) 302. Consists of including. The voice exchange subsystem 101 and the voice exchange subsystem 201 are connected to each other via HWSW301. Further, the voice exchange subsystem 101 and the voice exchange subsystem 201 are connected to each other via HWSW302 as well.

The voice exchange subsystem (# 1) 101 includes a voice exchange control unit (No1) 102, a voice exchange control unit (No2) 103, and a system switching control unit 104.

The voice exchange control unit 102 performs voice exchange control in the voice exchange subsystem 101 as an operation system. Further, the voice exchange control unit 102 includes an HWU 105 which is an interface unit for connecting to the voice exchange subsystem 201.

The HWU 105 includes two transmit and receive ports. Two routes, a route 1 via HWSW301 and a route 2 via HWSW302, are configured as transmission lines for transmission and reception between the HWU 105 and the voice exchange subsystem 201. That is, the two transmission / reception ports of the HWU 105 are connected to the HWSW301 and the HWSW302, respectively.

The HWU 105 transmits the audio signal / control / monitoring signal 120, which is the transmission signal of the route 1, to the audio exchange subsystem 201 via the HWSW301. Further, the HWU 105 receives the audio signal / control / monitoring signal 121, which is the reception signal of the route 1, from the audio exchange subsystem 201 via the HWSW301.

Similarly, the HWU 105 transmits the voice signal / control / monitoring signal 122 of the route 2 to the voice exchange subsystem 201 via the HWSW302. Further, the HWU 105 receives the voice signal / control / monitoring signal 123 of the route 2 from the voice exchange subsystem 201 via the HWSW302.

The voice exchange control unit 103 performs voice exchange control in the voice exchange subsystem 101 as a standby system. Further, the voice exchange control unit 103 includes an HWU 106 which is an interface unit for connecting to the voice exchange subsystem 201. The configuration of HWU106 is the same as that of HWU105.

The HWU 105 and HWU 106 always output the audio signal / control / monitoring signal to be transmitted to the opposite audio exchange subsystem 201 to both the route 1 and the route 2. Further, the HWU 105 and the HWU 106 take in the audio signal / control / monitoring signal received from the opposite audio exchange subsystem 201 from either the route 1 or the route 2.

The system switching control unit 104 switches the operation system between the voice exchange control unit 102 and the voice exchange control unit 103. Specifically, the system switching control unit 104 voice-exchanges the operation switching signal 110, which is a signal for switching between the operation system and the standby system, when a communication failure occurs in the voice exchange control unit 102, which is the operation system. It is output to the control unit 102 and the voice exchange control unit 103. That is, the voice exchange control unit 102 and the voice exchange control unit 103 determine whether to operate as an operation system or a standby system by the operation switching signal 110 from the system switching control unit 104. As a result, in the voice exchange subsystem 101, the voice exchange control can be redundantly configured between the active system and the standby system. The same applies at the time of restoration.

Further, the system switching control unit 104 transmits the operation switching signal 110 to the HWSW301 and the HWSW302.

The voice exchange subsystem (# 2) 201 includes a voice exchange control unit (No1) 202, a voice exchange control unit (No2) 203, and a system switching control unit 204. The voice exchange control unit 202 performs voice exchange control in the voice exchange subsystem 201 as a standby system. The voice exchange control unit 202 includes an HWU 205 which is an interface unit for connecting to the voice exchange subsystem 101. The voice exchange control unit 203 performs voice exchange control in the voice exchange subsystem 201 as an operation system. Further, the voice exchange control unit 203 includes an HWU 206 which is an interface unit for connecting to the voice exchange subsystem 101. The voice exchange control unit 202, the voice exchange control unit 203, and the system switching control unit 204 in the voice exchange subsystem 201 are the voice exchange control unit 103, the voice exchange control unit 102, and the system switching control in the voice exchange subsystem 101. Since the configuration is the same as that of the part 104, the description thereof will be omitted.

As a general rule, the HWSW301 and HWSW302 pass only the transmission signal from the operating system, and do not pass the transmission signal from the standby system. When the HWS W301 and the HWSW302 receive the operation switching signal from the system switching control unit 104 or the system switching control unit 204, the HWSW301 and the HWSW302 switch the handling between the operation system and the standby system from which the operation switching signal is transmitted. That is, in this case, HWSW301 and HWSW302 pass only the transmission signal from the standby system, and do not pass the transmission signal from the operation system.

Next, the flow of signals from the voice exchange subsystem 101 to the voice exchange subsystem 201 will be described below.

The audio signal / control / monitoring signal 120 for route 1 transmitted from the HWU 105 of the audio exchange control unit 102 in the operational state of the audio exchange subsystem 101 is the audio exchange control unit via the HWSW301 for route 1. It is received as a voice signal / control / monitoring signal 221 on the route 1 of the HWU 205 of 202, and is received as a voice signal / control / monitoring signal 225 on the route 1 of the HWU 206 of the voice exchange control unit 203.

Similarly, the voice signal / control / monitoring signal 122 for route 2 transmitted from the HWU 105 of the voice exchange control unit 102 also passes through the HWSW 302 for route 2 and is a voice signal in the route 2 of the HWU 205 of the voice exchange control unit 202. / It is received as a control / monitoring signal 223, and is also received as a voice signal / control / monitoring signal 227 on route 2 of the HWU 206 of the voice exchange control unit 203.

The voice signal / control / monitoring signal 124 for route 1 transmitted from the HWU 106 of the voice exchange control unit 103 in the standby system state of the voice exchange subsystem 101 is discarded inside the HWSW301 for route 1, and the voice exchange sub Not sent to system 201. Similarly, the voice signal / control / monitoring signal 126 for route 2 transmitted from the HWU 106 of the voice exchange control unit 103 in the standby system state is discarded inside the HWSW 302 for route 2 and sent to the voice exchange subsystem 201. Not sent.

The HWU 205 of the voice exchange control unit 202 of the voice exchange subsystem 201 is in the HWU 205 in advance among the voice signal / control / monitoring signal 221 and the voice signal / control / monitoring signal 223 received from both the route 1 and the route 2. Capture the signal from the set route. That is, the signal is always captured from either route 1 or route 2. Similarly, the HWU 206 of the voice exchange control unit 203 is also set in advance in the HWU 206 among the voice signal / control / monitoring signal 225 and the voice signal / control / monitoring signal 226 received from both the route 1 and the route 2. Capture the signal from the route you are using.

The same applies to the signal flow from the voice exchange subsystem 201 to the voice exchange subsystem 101. That is, the transmission signal from the HWU 206 of the voice exchange control unit 203 in the operating system state of the voice exchange subsystem 201 is transmitted from each HWU (105, 106) of each voice exchange control unit (102, 103) of the voice exchange subsystem 101. Received by route 1 and route 2.

In this way, by providing two connection transmission lines between the voice exchange subsystems, route 1 and route 2, even if one route cannot be used due to an abnormality, transmission between the voice exchange subsystems can be performed. Secure and enable continuous operation.

Next, a functional configuration in which the HWU automatically switches the transmission line when a transmission line abnormality occurs will be described. Each HWU is configured with an HWIF processing unit 401. FIG. 3 is a block diagram showing a configuration of a highway interface processing unit (hereinafter, HWIF processing unit) of the HWU. The HWIF processing unit 401 performs transmission / reception processing of the inter-voice exchange subsystem interface, and also performs automatic switching control of the transmission line.

The HWIF processing unit 401 includes a reception processing unit 402, a route selection processing unit 403, a reception selector 404, a transmission processing unit 405, and a transmission line information generation unit 406.

The reception processing unit 402 receives a reception signal including transmission line information from the voice exchange control unit of another voice exchange subsystem by the route 1 and the route 2 which are a plurality of transmission lines, and detects an abnormality of the transmission line. .. Here, the received signal is an audio signal and a control / monitoring signal. The voice signal is a signal indicating voice data to be exchanged with voice. The control / monitoring signal is a signal that controls various voice exchanges, and includes a survival signal. The survival signal includes a reception SYNC which is a frame synchronization signal and a reception CLK which is a clock signal. That is, the reception processing unit 402 captures the reception DATA by the reception SYNC and the reception CLK.

For example, assuming that the voice exchange subsystem that receives the received signal is the voice exchange subsystem 101, the reception processing unit 402 receives the received signal from the voice exchange control unit 203 of the other voice exchange subsystem 201 by the route 1 and the route 2. Receive.

The reception processing unit 402 detects that there is an abnormality in the transmission line when the survival signal included in the reception signal cannot be normally received. Specifically, the reception processing unit 402 monitors the reception SYNC and the reception CLK, and notifies the route selection processing unit 403 of an interface abnormality (IF_ALM) when at least one of them cannot be normally received.

Further, the reception processing unit 402 receives the transmission line information in the received received DATA and outputs it to the route selection processing unit 403.

When the reception processing unit 402 detects an abnormality in the transmission line, the route selection processing unit 403 selects another transmission line from the plurality of transmission lines. Specifically, the route selection processing unit 403 selects an available route when an interface abnormality is notified from the reception processing unit 402. In addition, the route selection processing unit 403 indicates that a transmission error (SEND_ALM) indicating an abnormality related to transmission of the voice exchange control unit of another voice exchange subsystem or an abnormality has occurred in the transmission line of the operation system in the transmission line information. When the indicated terminal abnormality (T_ALM) is included, it is detected that there is an abnormality in the transmission line.

Specifically, a dedicated area for notifying the transmission line information of the route currently used is provided in advance in the reception DATA. For example, a 1-bit flag area for SEND_ALM and a 1-bit flag area for T_ALM may be set. Then, when the route selection processing unit 403 detects that there is an abnormality in the transmission line, the route selection processing unit 403 selects an available route.

In this way, the route selection processing unit 403 automatically switches the transmission line used in the operation system by monitoring the interface abnormality, the transmission line information transmission abnormality, and the terminal abnormality. The switching conditions 1 to 3 for switching the transmission line in the route selection processing unit 403 are described below.

<Switching condition 1>
When an interface error is detected in the received signal of the route used in operation, "transmission error" is set in the transmission line information of the route used, and the route for capturing the received signal is switched.

<Switching condition 2>
When "transmission abnormality" is detected from the transmission line information of the reception DATA of the route used in operation, "terminal abnormality" is set in the transmission line information of the route used and the reception signal capture route is switched. ..

<Switching condition 3>
When a "terminal abnormality" is detected from the transmission line information of the reception DATA of the route used in operation, the acquisition route of the reception signal is switched.

By incorporating switching conditions 1 to 3 into the route selection processing unit 403 in all HWUs, it is possible to automatically switch routes for all transmission lines connecting the operation system and standby system between voice exchange subsystems. Become.

Further, the route selection processing unit 403 outputs a "transmission abnormality" to the transmission line information generation unit 406 in the case of switching condition 1, and outputs a "terminal abnormality" to the transmission line information generation unit 406 in the case of switching condition 2. Output.

The automatic switching of the transmission line is performed only when an abnormality occurs in the transmission line used for operation by the voice exchange control unit in the operation system state of each voice exchange subsystem. If an abnormality occurs in the transmission line in the voice exchange control unit in the standby state, the transmission line is switched in the standby voice exchange control unit, but the voice exchange control unit in the operating system is used. The transmission line is not switched.

The reception selector 404 switches the transmission line received by the reception processing unit 402 to another transmission line selected by the route selection processing unit 403. Specifically, the reception selector 404 captures the reception signal of route 1 or route 2 selected by the route selection processing unit 403 and passes it to a higher processing unit (not shown).

The transmission line information generation unit 406 generates transmission line information indicating the state of the transmission line.

The interface abnormality can be detected only by the voice configuration control unit on the receiving side. It is necessary to notify the voice exchange control unit on the transmitting side and other voice exchange control units that an abnormality has occurred. Therefore, the transmission line information generation unit 406 generates the transmission line information of the route. The transmission line information includes two types of abnormality detection signals, "transmission abnormality" and "terminal abnormality". The "transmission abnormality" is used as a signal for notifying the voice exchange subsystem of the communication partner that there is an abnormality in one's transmission. In addition, "terminal abnormality" is used as a signal to notify the standby system of the voice exchange subsystem of the communication partner that an abnormality has occurred in the operation system transmission line.

Specifically, when the reception processing unit 402 detects an interface abnormality, the transmission line information generation unit 406 generates transmission line information including a “transmission abnormality”. That is, when the "transmission abnormality" is acquired from the route selection processing unit 403, the transmission line information including the "transmission abnormality" is generated.

Further, the transmission line information generation unit 406 generates the transmission line information including the "terminal abnormality" when the transmission line information includes the "transmission abnormality". That is, when the "terminal abnormality" is acquired from the route selection processing unit 403, the transmission line information including the "terminal abnormality" is generated.

Then, the transmission line information generation unit 406 outputs the generated transmission line information to the transmission processing unit 405.

The transmission processing unit 405 transmits a transmission signal including the transmission line information generated by the transmission line information generation unit 406 to another voice exchange subsystem using the transmission line.

Specifically, the transmission processing unit 405 incorporates the transmission line information of each route generated by the transmission line information generation unit 406 into the transmission DATA, and synchronizes with the transmission SYNC which is a frame synchronization signal and the transmission CLK which is a clock signal. And output the transmission DATA. Note that the transmission DATA other than the transmission line information transmits the same data for both route 1 and route 2.

<Operation of voice exchange system according to the embodiment of the present invention>
Next, the route switching process in the HWU will be described. FIG. 4 is a flowchart showing a route switching processing routine according to the embodiment of the present invention. When the voice exchange process starts in the voice exchange system 10, the route switching process routine is started in the voice exchange control unit of the voice exchange subsystem.

First, in step S100, the reception processing unit 402 receives the reception signal including the transmission line information from the voice exchange control unit of another voice exchange subsystem by the route 1 and the route 2 which are a plurality of transmission lines.

In step S101, the reception processing unit 402 monitors the reception SYNC and the reception CLK, and determines whether or not both are normally received.

When the reception is not normally performed (NO in step S101), the route selection processing unit 403 selects an available route when the reception processing unit 402 notifies the interface abnormality in step S102, and the transmission line information. The generation unit 406 generates transmission line information including "transmission abnormality" (switching condition 1). Then, the process proceeds to step S105.

On the other hand, if all of them can be received normally (YES in step S101 above), in step S103, the route selection processing unit 403 has an abnormality related to transmission of the voice exchange control unit of another voice exchange subsystem from the transmission line information. Judges whether or not a transmission abnormality indicating is detected.

When a transmission abnormality is detected (YES in step S103 above), in step S104, the route selection processing unit 403 selects another usable route when the reception processing unit 402 notifies the interface abnormality, and selects a transmission path. The information generation unit 406 generates transmission line information including "terminal abnormality" (switching condition 2).

In step S105, the transmission processing unit 405 generates a transmission signal including the transmission line information generated by the transmission line information generation unit 406.

In step S106, the transmission processing unit 405 transmits the transmission signal generated in step S105 to another voice exchange subsystem using the transmission line used for reception.

In step S107, the reception selector 404 switches the transmission line received by the reception processing unit 402 to the other route selected in step S102 or step S104.

On the other hand, when no transmission abnormality is detected (NO in step S103 above), in step S108, the route selection processing unit 403 detects a terminal abnormality indicating that an abnormality has occurred in the transmission line of the operation system from the transmission line information. Determine if it has been detected.

When a terminal abnormality is detected (YES in step S108 above), in step S109, the route selection processing unit 403 selects an available route when the reception processing unit 402 notifies the interface abnormality, and the reception selector 404 selects an available route. , The transmission line received by the reception processing unit 402 is switched to another selected route (switching condition 3). Then, the process proceeds to step S110.

When no terminal abnormality is detected (NO in step S108), in step S110, the transmission line information generation unit 406 generates transmission line information indicating the state of the transmission line. At this time, the transmission line information generation unit 406 does not include the transmission abnormality and the terminal abnormality in the transmission line information.

In step S111, the transmission processing unit 405 generates a transmission signal including the transmission line information generated in step S110.

In step S112, the transmission processing unit 405 transmits the transmission signal generated in step S111 to another voice exchange subsystem using the transmission line used for reception, and ends the processing.

Next, an operation example of the route switching process in the voice exchange system 10 will be described. 5 and 8 are diagrams showing an operation example. Here, in the case of normal operation, a case where the transmission line is switched from the route 1 to the route 2 when an abnormality occurs in the route 1 will be described as an example.

An example of operation during normal operation is shown in FIG. In this example, the voice exchange control unit 102 of the voice exchange subsystem 101 is used in the active system state, the voice exchange control unit 103 is used in the standby system state, and the HWUs (104, 105) in each voice exchange control unit are roots. Use 1. Further, in this example, the voice exchange control unit 202 of the voice exchange subsystem 201 is used in the operating system state, the voice exchange control unit 203 is used in the standby system state, and the HWUs (204, 205) in each voice exchange control unit are used. Uses route 1.

<< Operation of switching condition 1 when an abnormality is detected >>
FIG. 6 shows the operation of the switching condition 1 when an abnormality is detected. The HWU 104 of the voice exchange control unit 102, which is the operating system state of the voice exchange subsystem 101, detects an interface abnormality in the received signal of route 1 from the HWU204) of the opposite voice exchange control unit 202 (S101). The HWU 104 that has detected the interface abnormality sets "transmission abnormality" in the transmission line information of the route 1 and transmits it to the voice exchange subsystem 201 (S102, S105, S106), and switches the capture of the received signal to the route 2 (S107). ).

<< Operation of switching condition 2 when an abnormality is detected >>
FIG. 7 shows the operation of the switching condition 2 when a transmission abnormality is detected. The HWU 204 of the voice exchange control unit 202 in the operating state of the voice exchange subsystem 201 detects a "transmission abnormality" of the transmission line information of the route 1 from the HWU 104 of the opposite voice exchange control unit 102 (S103). The HWU204 that has detected the transmission abnormality sets "terminal abnormality" in the transmission line information of the route 1 and transmits it to the voice exchange subsystem 101 (S104 to S106), and switches the capture of the received signal to the route 2 (S107).

Further, the voice exchange control unit 203 in the standby state of the voice exchange subsystem 201 also detects the “transmission abnormality” of the transmission line information of the route 1 and captures the received signal in the route 2 as in the voice exchange control unit 202. Switch to (S103 to S107).

<< Operation of switching condition 3 when an abnormality is detected >>
FIG. 8 shows the operation of the switching condition 3 when a terminal abnormality is detected. The HWU 105 of the voice exchange control unit 103 in the standby state of the voice exchange subsystem 101 detects a "terminal abnormality" of the transmission line information of the route 1 from the HWU 204 of the opposite voice exchange control unit 202 (S108). The HWU 105 that has detected the terminal abnormality switches the capture of the received signal to the route 2 (S109).

Through these series of flows, it is possible to switch from the intake route 1 of all HWUs to the route 2.

If the route to be switched to is already in a failure state when the route is switched, the route switching process is not executed.

Further, as the route switching means, in addition to the automatic switching, a configuration in which individual manual switching may be performed may be used. In this case, the selection of automatic switching or manual switching may be performed by mounting a selection switch on the HWU, and if manual switching is selected, the switching may be manually performed by the changeover switch mounted on the HWU. In the case of manual switching, only the transmission line route of the corresponding HWU is switched so that the route switching of other transmission lines does not occur.

As described above, according to the voice exchange system according to the embodiment of the present invention, when a received signal is received from a corresponding transmission processing unit in another voice exchange subsystem and an abnormality in a transmission line is detected, a plurality of voice exchange subsystems are used. Among the transmission lines, another transmission line is selected, transmission line information indicating an abnormality is generated, and a transmission signal including the generated transmission line information is transmitted to another voice exchange subsystem using the transmission line. By switching the receiving transmission line to the other selected transmission line, highly reliable voice exchange can be provided. In particular, in an air traffic control system, it is possible to provide highly reliable voice exchange in an air traffic control system by realizing redundancy between voice exchange subsystems, which has not been realized conventionally.

That is, it is possible to connect the transmission lines between the two sets of voice exchange subsystems constructed in a redundant configuration by duplication (route 1, route 2). Further, when an abnormality occurs in the transmission line, the transmission line can be automatically switched by passing the transmission line information between the voice exchange subsystems. As a result, a highly reliable effect as an air traffic control system was obtained as compared with the conventional one.

The present invention is not limited to the above-described embodiment, and various modifications and applications are possible without departing from the gist of the present invention.

In the above embodiment, the transmission line switching between the two types of voice exchange subsystems is shown, but the number of voice exchange subsystems is not limited. It can also be applied between multiple voice exchange subsystems.

Further, although described as an embodiment in which the program is pre-installed in the specification of the present application, it is also possible to provide the program by storing it in a computer-readable recording medium.

10 Voice exchange system 101 Voice exchange subsystem 102, 103 Voice exchange control unit 104 system switching control unit 105, 106 HWU
110 Operation switching signal 120 to 127 Voice signal / control / monitoring signal 201 Voice exchange subsystem 202, 203 Voice exchange control unit 204 system switching control unit 205, 206 HWU
220 to 227 Audio signal / control / monitoring signal 401 HWIF processing unit 402 Reception processing unit 403 Route selection processing unit 404 Reception selector 405 Transmission processing unit 406 Transmission line information generation unit

Claims (9)

A voice exchange control device used in a voice exchange subsystem in which a voice exchange transmission line is redundantly configured.
It includes a reception processing unit, a route selection processing unit, a transmission line information generation unit, a transmission processing unit, and a switching unit.
The reception processing unit receives a received signal from the voice exchange control device of the other voice exchange subsystem, and receives the received signal.
When the route selection processing unit detects an abnormality in the transmission line, the route selection processing unit selects another transmission line from the plurality of transmission lines.
The transmission line information generation unit generates transmission line information indicating the abnormality, and generates the transmission line information.
The transmission processing unit transmits a transmission signal including the transmission line information generated by the transmission line information generation unit to the other voice exchange subsystem using the transmission line.
The switching unit is a voice exchange control device that switches a transmission line received by the reception processing unit to the other transmission line selected by the route selection processing unit. Includes multiple voice exchange subsystems
The voice exchange subsystem has a redundant configuration including a plurality of voice exchange control units.
A voice exchange system in which communication between the plurality of voice exchange subsystems is made redundant. The voice exchange control unit includes a reception processing unit, a route selection processing unit, a transmission line information generation unit, a transmission processing unit, and a switching unit.
The voice exchange control unit of the voice exchange subsystem and the voice exchange control unit of another voice exchange subsystem are configured to be able to communicate using a plurality of transmission lines.
The reception processing unit receives a received signal from the voice exchange control unit of the other voice exchange subsystem, and receives the received signal.
When the route selection processing unit detects an abnormality in the transmission line, the route selection processing unit selects another transmission line from the plurality of transmission lines.
The transmission line information generation unit generates transmission line information indicating the state of the transmission line, and generates the transmission line information.
The transmission processing unit transmits a transmission signal including the transmission line information generated by the transmission line information generation unit to the other voice exchange subsystem using the transmission line.
The voice exchange system according to claim 2, wherein the switching unit switches a transmission line received by the reception processing unit to the other transmission line selected by the route selection processing unit. The voice exchange system according to claim 3, wherein the reception processing unit detects that there is an abnormality in the transmission line when a survival signal cannot be normally received from the voice exchange control unit of the other voice exchange subsystem. .. The voice exchange system according to claim 4, wherein the survival signal is a frame synchronization signal or a transmission clock signal. The reception processing unit receives a reception signal including the transmission line information from the voice exchange control unit of the other voice exchange subsystem, and receives the reception signal.
The voice exchange system according to any one of claims 3 to 5, wherein the route selection processing unit detects that there is an abnormality in the transmission line based on the transmission line information. The route selection processing unit has a transmission abnormality indicating that the transmission line information has an abnormality related to transmission of the voice exchange control unit of the other voice exchange subsystem, or a terminal abnormality indicating that an abnormality has occurred in the transmission line. The voice exchange system according to claim 6, which detects that there is an abnormality in the transmission line when is included. The voice exchange system according to claim 7, wherein the transmission line information generation unit generates transmission line information including the terminal abnormality when the transmission line information includes the transmission abnormality. The voice exchange system according to any one of claims 2 to 8, which is used in an air traffic control system.

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