JP4893575B2 - Gateway device, traffic control method, signal processing device, and signal processing program - Google Patents

Description

  The present invention relates to a gateway device, a traffic control method, a signal processing device, and a signal processing program for mutually connecting a circuit switching network and a packet communication network, and in particular, a portion accommodating the circuit switching network and the packet communication network. The present invention relates to a gateway device, a traffic control method, a signal processing device, and a signal processing program for performing interconnection between a circuit switching network and a packet communication network after duplicating an active system and a standby system.

  Conventionally, in the case where the part that accommodates the access network is duplicated in the active system and the standby system, a method of installing a third device for managing the device by duplicating the device itself, or a data input / output unit in the device In addition, a method has been adopted in which the route management is performed so that the data flow passes only to the operational system after the data processing portion is duplicated.

  Regarding duplexing of communication devices, for example, in Patent Document 1, a packet signal output from a signal conversion unit that packetizes an in-device signal output from an exchange unit toward a packet communication network is directed to a destination in the packet communication network. The packet switch section that sends out the route control is made redundant by having an active system (active packet switch) and a standby system (standby system packet switch), and when the operating system fails, the packet signal is input to the standby system and operated. There is described a gateway device including switching means for inputting a packet signal to an active system and a standby system when there is no failure in the system and the standby system.

JP 2007-019831 A

  However, in the method of installing a third device that duplicates the device itself and manages / controls it, a large-scale system construction is required. Also, in the method of performing path management / control so that the data flow passes only to the operational system after duplicating the data input / output unit and the data processing part in the device, the progress of the data stream in the device There is a problem that the route selection and routing function is required so that the direction is always directed to the active system, and the system switching process is complicated.

  For example, if the call state during circuit switching managed by the active system is not correctly taken over to the new active system, it becomes an abnormal state as a communication network system. It is necessary to perform processing for synchronizing the call state such as call information takeover between the package that has been operating and the package that is to become a new active system. Note that the package indicates a physical unit of functional units constituting the gateway device.

  Note that the gateway device described in Patent Document 1 only describes the duplication of the packet switch unit that outputs to the packet communication network, and does not include input from the packet communication network or input to the circuit switching network. Duplication of the output part is not considered at all.

  Therefore, the present invention is a case where a part for accommodating a circuit switching network and a packet communication network is duplicated into an active system and a standby system in a gateway device for mutually connecting a circuit switching network and a packet communication network. It is another object of the present invention to provide a gateway device, a traffic control method, a signal processing device, and a signal processing program that are not complicated at the time of system switching.

  A gateway device according to the present invention is a gateway device for connecting a circuit switching network and a packet communication network to each other, and converts a circuit switching network signal input from the circuit switching network into an in-device signal. Circuit switching that includes a circuit switching network interface unit that converts a signal into a circuit switching network signal and sends it to the circuit switching network, and an in-device interface unit that transmits and receives in-device signals to and from other packages The network input / output package is duplicated between the active system and standby system, and packet signals input from the packet communication network are converted into in-device signals. When in-device signals are input, they are converted into packet signals. A packet communication network interface unit for transmitting to the packet communication network, and an in-device interface unit for transmitting / receiving in-device signals to / from other packages. In the gateway device provided with the packet communication network input / output package duplicated in the active system and the standby system, the in-device interface part included in each package has a duplicated package as the destination of the in-device signal. If it is a package, it is sent to both the active system and the standby system. When receiving an in-device signal from a duplicated package, the in-device signal from the package operating as the standby system is discarded. The circuit switching network interface unit interrupts signal transmission to the circuit switching network when the circuit switching network input / output package including the circuit switching network interface unit operates as a standby system, and the packet communication network interface unit The packet communication network input / output package including the packet communication network interface unit operates as a standby system. Characterized by interrupting the signal transmission to the packet communication network in the case that.

  A signal processing device according to the present invention is a signal processing device provided in a gateway device for mutually connecting communication networks of different protocols, and having an interface with one communication network, and the gateway device has an operational system. Input from a communication network in a signal processing apparatus having an interface with a second signal processing apparatus provided in duplicate in at least a gateway system and in an operation system and a standby system. A network interface unit that converts a network signal to be converted into an in-device signal, and converts the network signal into a network signal when the in-device signal is input and sends the signal to the communication network; and a second signal processing device in the gateway device Duplicate signal processing in the in-device interface unit that transmits and receives in-device signals between the gateway device and the gateway device A system state holding unit that holds information for determining the system state of the device, and the in-device interface unit operates when transmitting an in-device signal to the duplexed second signal processing device. When transmitting an in-device signal from the duplexed second signal processing device while transmitting to both the standby system and the standby system, the in-device signal from the second signal processing device operating as the standby system is received. The network interface unit discards the signal transmission to the communication network when the signal processing apparatus is operating as a standby system.

  The traffic control method according to the present invention converts a circuit switched network signal input from a circuit switched network into an in-device signal, and converts the signal into a circuit switched network signal when the in-device signal is input. A circuit-switching network input / output package including a circuit-switching network interface unit to be transmitted and an in-device interface unit for transmitting / receiving in-device signals to / from other packages, and a packet signal input from the packet communication network to the device In the device that transmits and receives internal signals between the packet communication network interface unit that converts the internal signal into a packet signal when the internal signal is input and sends it to the packet communication network, and another package A gateway device equipped with a duplicated packet communication network input / output package including an interface unit for the active and standby systems. Traffic control method in which the same circuit switching network signal is input to the active circuit switching network input / output package and the standby circuit switching network input / output package, and each circuit switching network input / output is duplicated. When the in-device interface part of the package sends an in-device signal to the duplicated packet communication network input / output package, it is sent to both the active and standby systems, and for each duplicated packet communication network input / output When the in-device interface unit of the package receives the in-device signal from the duplicated circuit switched network input / output package, the in-device signal from the standby circuit switched network input / output package is discarded, and the packet communication network interface unit However, when the packet communication network input / output package including the packet communication network interface is operating as a standby system Signal transmission to the packet communication network is cut off, the same packet signal is input to the active packet communication network input / output package and the standby packet communication network input / output package, and each packet communication network input / output duplicated When the in-device interface part of the product package sends an in-device signal to the duplicated circuit-switched network input / output package, it sends it to both the active and standby systems and enters each duplicated circuit-switched network. When the in-device interface unit of the output package receives an in-device signal from each duplicated packet communication network input / output package, the in-device signal from the standby packet communication network input / output package is discarded and the line When the switching network interface unit is operating as a standby system for a circuit switching network input / output package including the circuit switching network interface unit, It is characterized in that signal transmission to a circuit switching network is cut off.

  A signal processing program according to the present invention is provided in a gateway device for mutually connecting communication networks of different protocols, and is a signal processing device having an interface with one communication network, and is operated in the gateway device. A signal applied to a signal processing device that is duplexed in a standby system and a second signal processing device that is duplexed in an active system and a standby system in at least a gateway device A processing program for converting a network signal input from a communication network into a computer signal into a computer, converting a network signal into a network signal and sending it to the communication network when the device signal is input, and duplicating When transmitting an in-device signal to the second signal processing device, the processing to transmit to both the active system and the standby system is duplicated. When receiving an in-device signal from the second signal processing device, processing for discarding the in-device signal from the second signal processing device operating as a standby system, and the signal processing device operating as a standby system In this case, a process for cutting off signal transmission to the communication network is executed.

  According to the present invention, in a gateway device for connecting a circuit switching network and a packet communication network to each other, system switching when a part accommodating the circuit switching network and the packet communication network is duplicated into an active system and a standby system The complexity of processing at the time can be eliminated.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration example of a gateway device according to the present invention. The gateway device 1 shown in FIG. 1 includes a circuit-switched network input / output package 20 (20-1, 20-2) having a signal input / output function on the circuit-switched network side and a packet having a signal input / output function on the packet-communication network side. And a communication network input / output package 30 (30-1, 30-2). In this embodiment, the circuit switching network input / output package 20 and the packet communication network input / output package 30 are duplicated by providing two systems of a package that operates as an active system and a package that operates as a standby system, respectively. .

  The same circuit switching network signal is input to the circuit switching network input / output package 20-1 and the circuit switching network input / output package 20-2. The same packet signal is input to the packet communication network input / output package 30-1 and the packet communication network input / output package 30-2.

  The circuit switched network input / output package 20 includes a circuit switched network interface unit (hereinafter referred to as a circuit switched network I / F unit) 201 and an in-device interface unit (hereinafter referred to as an in-device I / F unit) 101. .

  The packet communication network input / output package 30 includes a packet communication network interface unit (hereinafter referred to as a packet communication network I / F unit) 301 and an in-device I / F unit 101.

  The in-device I / F unit 101 transmits / receives in-device signals to / from other packages. The in-device I / F unit 101 controls the transmission destination so as to reach both the active system and the standby system when transmitting an in-device signal related to the connection between networks to the duplicated package. In addition, when an in-device signal related to an inter-network connection is received from a duplicated package, processing for discarding the in-device signal is performed if it is an in-device signal transmitted from a package operating as a standby system. The intra-device signal related to the inter-network connection is specifically an intra-device signal converted by a circuit-switched network I / F unit 201 described later, and an intra-device signal converted by the packet communication network I / F unit 301. Signals and in-device signals converted by call control means. In FIG. 1, the trapezoidal notch mark on the in-device I / F unit 101 indicates that the in-device I / F unit 101 discards the received signal depending on whether or not the transmission source is operating as an active system. It shows that it has a discard function.

  The circuit switching network I / F unit 201 inputs a circuit switching network signal from the circuit switching network and converts it into an in-device signal. When the in-device signal is input, the circuit switching network I / F unit 201 converts the signal into a circuit switching network signal. Send it out. The circuit switching network I / F unit 201 sends a circuit switching network signal to the circuit switching network only when the circuit switching network input / output package 20 operates as an active system. In FIG. 1, a triangular cutout mark on the circuit switching network I / F unit 201 indicates that a signal is sent to the circuit switching network depending on whether or not the circuit switching network I / F unit 201 is operating as an active system. It shows that it has a transmission cut-off function to cut off.

  The packet communication network I / F unit 301 receives a packet signal from the packet communication network and converts it into an in-device signal. When the in-device signal is input, the packet communication network I / F unit 301 converts the packet signal into a packet signal and sends it to the packet communication network. The packet communication network I / F unit 301 transmits a packet signal to the packet communication network only when the packet communication network input / output package 30 operates as an active system. In FIG. 1, triangular cutout marks on the packet communication network I / F unit 301 indicate that signals are sent to the packet communication network depending on whether or not the packet communication network I / F unit 301 is operating as an active system. It shows that it has a transmission cut-off function to cut off.

  Although not shown, the circuit switching network I / F unit 201 converts the signal on the input / output path of the in-device signal between the circuit switching network I / F unit 201 and the packet communication network I / F unit 301. Control processing including processing for converting the in-device signal into the in-device signal corresponding to the protocol of the network at the connection destination for the in-device signal and the in-device signal converted by the packet communication network I / F unit 301 A call control function unit is provided. In the present embodiment, the case where the call control function unit is provided between the packet communication network I / F unit 301 and the in-device I / F unit 101 in the packet communication network input / output package 30 is used as an example. I will explain.

  Hereinafter, a description will be given using a more specific configuration example. FIG. 2 is a block diagram illustrating a more specific configuration example of the gateway device according to the present embodiment. A gateway device 1 shown in FIG. 2 is a gateway device for mutually connecting a circuit switching network which is an ISDN network and a packet communication network which is an IP network, and corresponds to the circuit switching network input / output package 20 in FIG. The PRI package 20 (20-1, 20-2) and the GWC package 30 (30-1, 30-2) corresponding to the packet communication network input / output package 30 are provided. Also in this example, the PRI package 20 and the GWC package 30 are duplicated by providing two systems of a package that operates as an active system and a package that operates as a standby system, respectively.

  In this example, optical input from the ISDN network is performed by inputting the same data stream (specifically, optical signal) to both systems of the PRI package 20 by using a splitter 401 that branches (duplicates) the optical signal. ing. Both systems refer to both active and standby systems. Note that the optical output to the ISDN network uses a splitter 402 that combines optical signals to output signals from both systems of the PRI package 20 to one optical output line. On the IP network side, an L3 switch 501 is provided as an IP termination, and the L3 switch 501 is mirrored (duplicated) to input the same data stream (specifically, packet signal) to both systems of the GWC package 30. ing. In addition, when the GWC package 30 is set as an IP termination without providing the L3 switch 501, the GWC package 30 operating as an active system receives it after operating with different IP addresses in each GWC package 30. The packet signal may be mirrored and passed to the GWC package 30 operating as a standby system.

  A PRI (Primary Rate Interface) package 20 is a package for attaching an optical line and converting an optical signal into an electric signal. The ISDN network interface unit (hereinafter referred to as an ISDN network I / F unit) 201, A GWC package interface unit (hereinafter referred to as a GWCI / F unit) 202 and a system state holding unit 203 are included.

  A gateway controller (GWC) package 30 accommodates a LAN switch that performs input / output with an IP network via an L3 switch 501, and performs management / control and call control processing within the apparatus while inputting / outputting packet signals. Package, an IP network interface unit (hereinafter referred to as an IP network I / F unit) 301, a call control function unit 302, and an anti-PRI package interface unit (hereinafter referred to as an anti-PRI I / F unit). 303, a system state holding unit 304, and a system state control unit 305.

  The ISDN network I / F unit 201 receives an optical signal from the ISDN network and converts the optical signal into an electrical signal, thereby converting the optical signal into an in-device signal that is an electrical signal corresponding to the ISDN network protocol. When an in-device signal, which is an electrical signal corresponding to the ISDN network protocol, is input, the in-device signal is converted into an optical signal and transmitted to the circuit switching network. The ISDN network I / F unit 201 transmits an optical signal to the ISDN network only when the PRI package 20 operates as an active system.

  The GWCI / F unit 202 transmits and receives in-device signals related to the connection between networks between the PRI package 20 and the GWC package 30. Specifically, the GWCI / F unit 202 transmits an in-device signal, which is an electrical signal corresponding to the ISDN network protocol converted by the ISDN network I / F unit 201, to the GWC package 30, An in-device signal corresponding to an optical signal transmitted from the GWC package 30 toward the ISDN network (specifically, an electrical signal corresponding to the ISDN network protocol converted by the call control function unit 302) In-device signal) is received.

  The GWCI / F unit 202 for the GWCI / F unit 202 transmits an in-device signal, which is an electrical signal corresponding to the ISDN network protocol converted by the ISDN network I / F unit 201, to the GWC package 30. Send to reach both. That is, the GWCI / F unit 202 transmits a data stream to both systems without selecting a route for the GWC package 30.

  Further, the GWCI / F unit 202 receives a signal from the GWC package 30 operating as a standby system when receiving an in-device signal corresponding to an optical signal transmitted from the GWC package 30 to the ISDN network. If it is a transmitted in-device signal, processing for discarding the in-device signal without accepting it is performed. For example, the GWCI / F unit 202 includes a signal selector in a portion that receives a data stream from the GWC package 30, selects only a signal from the active system, and blocks a signal from the standby system. What is necessary is just to control a signal selector. The GWCI / F unit 202 is a processing unit corresponding to the in-device I / F unit 101 of the circuit switched network input / output package 20 in FIG.

  The system state holding unit 203 stores information for determining the system state of the duplicated package in the PRI package 20. For example, information indicating which system is operating may be held for each duplicated package. Further, for example, information for identifying a package operating as an active system may be held for each type of duplicated package. As will be described later, the system state holding unit 203 exchanges information about the system state with the system state control unit 305 of the GWC package 30 to determine the system state of the duplicated package. Get information.

  The IP network I / F unit 301 inputs an IP packet signal from the IP network and assembles the IP packet signal, thereby converting the IP packet signal into an in-device signal that is an electrical signal corresponding to the protocol of the IP network. When an in-device signal that is an electrical signal corresponding to the IP network protocol is input, the in-device signal is packetized and transmitted to the IP network. The IP network I / F unit 301 transmits an IP packet signal to the IP network only when the GWC package 30 operates as an active system.

  The call control function unit 302 includes an in-device signal corresponding to the ISDN network protocol converted by the ISDN network I / F unit 201 and an in-device signal corresponding to the IP network protocol converted by the IP network I / F unit 301. On the other hand, call control processing including processing (protocol conversion processing) for converting the in-device signal into an in-device signal corresponding to the protocol of the connection destination network is performed. In addition to the protocol conversion process, the call control function unit 302 performs, for example, a call control process (such as making a ringing bell sound and sending it to the caller terminal, detecting a timeout) for providing the function of the exchange. Sometimes it is done. In this example, a call control process according to the ISDN standard (Q.931) is performed on a terminal on the ISDN network side, or a call control process based on the SIP protocol is performed on a terminal on the IP network side. . In order to perform such call control processing, the call control function unit 302 performs call connection during network connection based on the in-device signal converted by the ISDN network I / F unit 201 or the IP network I / F unit 301. The call information indicating the state of is held. Specifically, the call control function unit 302 is divided into a function block by a DSP (Digital Signal Processor) or the like that performs protocol conversion on an audio signal and a function block by a CPU or the like that performs protocol conversion on a call control signal. Implemented.

  The anti-PRI I / F unit 303 transmits and receives in-device signals related to the connection between networks between the PRI package 20 and the GWC package 30. Specifically, the PRI I / F unit 303 is an in-device signal (specifically, a call control function unit 302) that is an electrical signal corresponding to an optical signal transmitted to the ISDN network to the PRI package 20. The in-device signal, which is an electrical signal corresponding to the ISDN network protocol converted by (1), is transmitted. In addition, an in-device signal, which is an electrical signal corresponding to the ISDN network protocol, is received from the PRI package 20.

  The PRI I / F unit 303 reaches both the active system and the standby system when transmitting an in-device signal, which is an electrical signal corresponding to an optical signal transmitted to the ISDN network, to the PRI package 20. To send. In other words, the anti-PRI I / F unit 303 transmits the data stream to both systems without selecting a route for the PRI package 20.

  The PRI I / F unit 303 receives a device signal transmitted from the GWC package 30 operating as a standby system when receiving an in-device signal that is an electrical signal corresponding to the protocol of the ISDN network from the PRI package 20. If it is an internal signal, processing for discarding the internal signal without accepting it is performed. For example, the anti-PRI I / F unit 303 includes a signal selector in a portion that receives a data stream from the PRI package 20, selects only a signal from the active system, and blocks a signal from the standby system. What is necessary is just to control the signal selector. The PRI I / F unit 303 is a processing unit corresponding to the in-device I / F unit 101 of the packet communication network input / output package 30 in FIG.

  Note that the anti-PRI I / F unit 303 has firmware that distributes the received in-device signal into a voice signal and a call control signal.

  The system state holding unit 304 stores information for determining the system state of the duplicated package in the GWC package 30. For example, information indicating which system is operating may be held for each duplicated package. Further, for example, information for identifying a package operating as an active system may be held for each type of duplicated package.

  The system state control unit 305 collects the failure state of the duplicated package and determines which one is to be operated as the active system. When system switching occurs, the system state holding unit of each package (specifically, the system state holding unit 203 of the PRI package 20-1, the system state holding unit 203 of the PRI package 20-2, and the GWC). Control is performed to update information held by the system state holding unit 304 of the package 30-1 and the system state holding unit 304) of the GWC package 30-2. For example, the system state control unit 305 may notify and collect information indicating a system state or information indicating a failure state as a different type of in-device signal from the in-device signal related to the network connection. Since the GWC package 30 is duplicated, the system state control unit 305 also operates doubly, so that, for example, the system state control unit of the GWC package 30 that is operating as an active system at normal times. The system state control unit of the GWC package 30 operating as a standby system only when an abnormality occurs in the system state control unit 304 operating as the active system after only the system 305 determines the system switching. What is necessary is just to make 305 determine the system switching.

  For example, the system state control unit 305 may exchange a system switching request and a system switching response, and exchange system state information with the system state control unit 305 of the other system GWC package 30. . Further, for example, a system change request, a system state information notification, or a system state information inquiry may be sent to the system state holding unit 203 of the PRI package 20. If direct control cannot be performed on the system state holding unit 304 of the GWC package 30, similar communication may be performed using in-package communication. Then, the corresponding system state holding unit 203 (and the system state holding unit 305) receives a system state change request and a system state information notification from the system state control unit 305 of the GWC package 30 operating as an active system, and receives information. It may be updated or notified to the system state control unit 305 of the GWC package 30 operating as the active system when the own system state changes.

  Next, the flow of the data stream in the present embodiment will be described. First, the flow of a data stream from the ISDN network to the IP network will be described. FIG. 3 is an explanatory diagram showing the flow of the data stream from the ISDN network to the IP network. Here, a case where the PRI package 20-1 operates as an active system, the PRI package 20-2 operates as a standby system, the GWC package 30-1 operates as an active system, and the GWC package 30-2 operates as a standby system. Explained as an example.

  As shown in FIG. 3, the optical signal transmitted through the optical input line is input as the same data stream to both systems of the PRI package 20 (specifically, 20-1 and 20-2) by the splitter 401. The In the PRI package 20 of both systems, the ISDN network I / F unit 201 converts each into an electrical signal, and then the paired GWCI / F unit 202 configures both systems of the GWC package 30 (specifically, 30-1 and 30- 2). In addition, the process of selecting a route to transmit only to the operational system as seen in the prior art is unnecessary.

  In the GWC package 30 of both systems, the paired PRI I / F unit 303 receives the same data stream from the PRI package 20 of both systems, but the standby PRI package 20 (here, The data stream from the PRI package 20-2) is blocked, and only the data stream from the active PRI package 20 (here, the PRI package 20-1) is allowed to be input. Which PRI package 20 is the active or standby system may be determined using information held in the system state holding unit 305 in the own package.

  In the GWC package 30 of both systems, the call control function unit 302 performs call control on the data stream (the optical signal converted into the electrical signal) received from the operational PRI package 20 (PRI package 20-1). By performing processing (including protocol conversion processing), the data stream is converted into a data stream corresponding to the IP network and output to the IP network I / F unit 301. Here, the IP network I / F unit 301 of the active GWC package 30 (here, the GWC package 30-1) packetizes the converted data stream and sends it to the IP network. The standby GWC package The IP network I / F unit 301 of 30 (here, the GWC package 30-2) blocks transmission to the IP network. The information held in the system state holding unit 305 in the own package may be used for determining whether the own system state is the active system or the standby system.

  Next, the flow of a data stream from the IP network to the ISDN network will be described. FIG. 4 is an explanatory diagram showing the flow of a data stream from the IP network to the ISDN network. Also here, the PRI package 20-1 operates as an active system, the PRI package 20-2 operates as a standby system, the GWC package 30-1 operates as an active system, and the GWC package 30-2 operates as a standby system. Explained.

  As shown in FIG. 4, the IP packet transmitted from the IP network is mirrored by the L3 switch 501 (or the IP network I / F unit 301 of the active GWC package 30), and is sent to both systems of the GWC package 30. Input as the same data stream. In the GWC package 30 of both systems, the IP network I / F unit 301 assembles IP packets, and the call control function unit 302 performs call control processing (including protocol conversion processing), respectively. After being converted into a signal data stream, the paired PRI I / F unit 303 transmits the signals to both systems of the PRI package 20. In addition, the process of selecting a route to transmit only to the operational system as seen in the prior art is unnecessary.

  In the PRI packages 20 of both systems, the GWCI / F unit 202 receives the same data stream from the GWC packages 30 of both systems, but each pair of GWCI / F units 202 receives the standby system by the signal selector of the receiving part. The data stream from the GWC package 30 (here, the GWC package 30-2) is blocked, and only the data stream from the active GWC package 30 (here, the GWC package 30-1) is allowed to be input. Which GWC package 30 is the active or standby system may be determined using information held in the system state holding unit 203 in the own package.

  In both PRI packages 20, the ISDN network I / F unit 201 receives a data stream (a data stream of an electrical signal corresponding to the ISDN network) input from the active GWC package 30 (GWC package 30-1). The ISDN network I / F unit 201 of the standby PRI package 20 (PRI package 20-2) uses its own transmission blocking function to convert the optical signal into an ISDN network. Block transmission to the line. The ISDN network I / F unit 201 of the active PRI package 20 (PRI package 20-1) converts the input data stream into an optical signal and sends it to the optical line. The information held in the system state holding unit 203 in the own package may be used for determining whether the own system state is the active system or the standby system.

  As described above, in this configuration, only the data stream that has passed through each operation system passes through the present apparatus between the PRI package 20 and the GWC package 30.

  FIG. 5 is an explanatory diagram showing the flow of the data stream when the PRI package 20-1 operating as the active system is switched to the standby system due to the occurrence of a failure. As shown in FIG. 5, even if the system switching is performed between the PRI package 20-1 and the PRI package 20-2, the PRI package 20-1 and the PRI package 20-2 are equivalent to that. The data stream that is allowed to be input on the GWC package 30 side that receives the same data stream is output to the GWC package 30 of both systems. By simply switching, the subsequent processing can be continued without any special synchronization processing.

  FIG. 6 is an explanatory diagram showing the flow of the data stream when the GWC package 30-1 operating as the active system is switched to the standby system due to the occurrence of a failure. As shown in FIG. 6, even when system switching is performed between the GWC package 30-1 and the GWC package 30-2, the GWC package 30-1 and the GWC package are similar to the system switching of the PRI package 20. An equivalent data stream is input to 30-2, and the respective data streams are output to the PRI packages 20 of both systems. By simply switching the data stream that permits input, the subsequent processing can be continued without performing special synchronization processing. For example, even if the package to be switched includes a function unit that holds call information based on the data stream received so far, such as the call control function unit 302, the same Since the data stream is also input to the standby system package, the equivalent call information is also held in the standby function unit, so state synchronization processing such as taking over the information is performed. System switching can be executed without any problem.

  As described above, according to the present embodiment, since the equivalent data stream passes through both of the duplicated packages, the implementation for state synchronization considering system switching is reduced, and system switching is executed. Sometimes the state synchronization time required is also reduced.

  Further, since there is no need to select a route between the duplicated packages, an effect is obtained that active processing is not necessary in the functional block through which the data stream passes. For example, a DSP or LAN switch that specifically configures the GWC package 30 can operate without knowing the system status of the PRI package 20. Also, if the route of the GWC package 30 is to be selected, “send to the active PRI package 20 if it is the active system”, “receive from the active PRI package 20 if it is the active system” Although route management must be performed with two pieces of information such as “only allow”, such route management is not necessary.

  Further, according to the present embodiment, it is possible to reduce the influence on the service provided by the apparatus that may occur when the system state changes. This is because the processing time during system switching can be shortened. In addition, it is not necessary to construct a complicated route selection logic assuming every pattern, and a simple implementation can be performed. In addition, the simple configuration is expected to reduce the cause of failure.

  The above embodiment is a gateway device for connecting a circuit switching network and a packet communication network to each other, and converts a circuit switching network signal input from the circuit switching network into an in-device signal. A circuit-switched network interface unit (for example, a circuit-switched network I / F unit 201, an ISDN network I / F unit 201) that converts an internal signal into a circuit-switched network signal and sends it to the circuit-switched network; A circuit-switched network input / output package including an in-device interface unit (for example, in-device I / F unit 101 and GWCI / F unit 202) that transmits / receives in-device signals to / from the package, and a standby system The packet signal input from the packet communication network is converted into an in-device signal, and when the in-device signal is input, it is converted into a packet signal and sent to the packet communication network. A packet communication network interface unit (for example, a packet communication network I / F unit 301, an IP network I / F unit 301) and an intra-device interface unit (for example, a device) In a gateway apparatus provided with a packet communication network input / output package including the internal I / F unit 101 and the PRI I / F unit 303), which is duplicated in the active system and the standby system, in each apparatus included in each package When the package that is the destination of the in-device signal is a duplicated package, the interface unit transmits to both the active system and the standby system, and receives the in-device signal from the duplicated package. The signal within the apparatus from the package operating as the standby system is discarded, and the circuit switching network interface unit is connected to the circuit switching network interface unit. When the circuit switching network input / output package including the packet switching network is operating as a standby system, the signal transmission to the circuit switching network is cut off, and the packet communication network interface unit enters the packet communication network interface unit including the packet communication network interface unit. When the output package operates as a standby system, a configuration of a gateway device that blocks signal transmission to the packet communication network is shown.

  Further, in the above embodiment, the in-device signal and the packet communication network interface converted by the circuit switching network interface unit on the input / output path of the in-device signal between the circuit switching network interface unit and the packet communication network interface unit. A call control function unit (for example, call control function unit 302) that performs a call control process including a process of converting the in-device signal converted by the communication unit into an in-device signal corresponding to the protocol of the connection destination network. The configuration of the gateway device is shown.

  Further, in the above embodiment, circuit switched network signal duplicating means (for example, splitter 401) that inputs the same circuit switched network signal to the active circuit switched network input / output package and the standby circuit switched network input / output package. ) And packet network signal duplicating means (for example, L3 switch 501) for inputting the same packet signal to the operational packet communication network input / output package and the standby packet communication network input / output package. The configuration of is shown.

  In the above embodiment, the configuration of the gateway device including a system state holding unit (for example, the system state holding unit 304) that holds information for determining the system state of the duplicated package in each package is shown. Has been.

  In the above embodiment, the failure status of the duplicated packages is collected, it is determined which one is operated as the active system, and the system status holding unit of each package holds when system switching occurs. A configuration of a gateway device including a system state control unit (for example, a system state control unit 305) that performs control for updating information is illustrated.

  In the above embodiment, in the gateway device in which the circuit-switched network signal is an optical signal, the circuit-switched network interface unit converts the circuit-switched network signal input from the circuit-switched network into an electrical signal, thereby converting the in-device signal. In addition, the signal inside the device is converted into an optical signal by converting it into an optical signal, and the packet communication network interface unit converts the packet signal inputted from the packet communication network into an signal inside the device. In addition, a configuration of a gateway device that converts an in-device signal into a packet signal by packetizing is shown.

  In the above embodiment, a configuration of a gateway device in which the circuit switching network is an ISDN network and the packet communication network is an IP network is shown.

  The present invention can be suitably applied to a gateway device that interconnects circuit-switched networks that operate with different protocols and that duplicates the input / output interface portion of each network side.

It is a block diagram which shows the structural example of the gateway apparatus by this invention. It is a block diagram which shows the more specific structural example of the gateway apparatus by this invention. FIG. 3 is an explanatory diagram showing a flow of a data stream from the ISDN network to the IP network in the gateway device 1 shown in FIG. 2. FIG. 3 is an explanatory diagram showing a flow of a data stream from the IP network to the ISDN network in the gateway device 1 shown in FIG. 2. 6 is an explanatory diagram showing a flow of a data stream after system switching of the PRI package 20. FIG. 6 is an explanatory diagram showing a flow of a data stream after system switching of the GWC package 30. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gateway apparatus 20 Circuit switching network input / output package, PRI package 30 Packet communication network input / output package, GWC package 101 I / F part in apparatus 201 Circuit switching network I / F part, ISDN network I / F part 202 vs. GWCI / F Unit 203 system state holding unit 301 packet communication network I / F unit, IP network I / F unit 302 call control function unit 303 versus PRI I / F unit 304 system state holding unit 305 system state control unit

Claims (11)

A gateway device for mutually connecting a circuit switching network and a packet communication network,
A circuit-switched network interface unit that converts a circuit-switched network signal input from the circuit-switched network into an in-device signal, converts the signal into the circuit-switched network signal when it is input, and sends it to the circuit-switched network; A circuit-switched network input / output package including an in-device interface unit that transmits and receives in-device signals to and from the package is duplicated in the active system and the standby system,
A packet signal input from the packet communication network is converted into an in-device signal. When the in-device signal is input, the packet signal is converted into a packet signal and transmitted to the packet communication network. In a gateway device provided with a packet communication network input / output package including an in-device interface unit that transmits and receives in-device signals between the operating system and the standby system,
The in-device interface unit included in each package transmits to both the active system and the standby system when the package that is the destination of the in-device signal is a duplicated package, and from the duplicated package to the device When receiving the internal signal, discard the internal signal from the package operating as the standby system,
The circuit switched network interface unit shuts off signal transmission to the circuit switched network when the circuit switched network input / output package including the circuit switched network interface unit is operating as a standby system,
The packet communication network interface unit cuts off signal transmission to the packet communication network when the packet communication network input / output package including the packet communication network interface unit operates as a standby system. apparatus. Device signal converted by the circuit switching network interface unit and device converted by the packet communication network interface unit on the input / output path of the signal within the device between the circuit switching network interface unit and the packet communication network interface unit The gateway device according to claim 1, further comprising a call control function unit that performs a call control process including a process of converting an internal signal into an internal signal corresponding to a protocol of a connection destination network. Circuit switched network signal duplicating means for inputting the same circuit switched network signal to the active circuit switched network input / output package and the standby circuit switched network input / output package;
The gateway apparatus according to claim 1 or 2, further comprising: a packet network signal duplicating unit that inputs the same packet signal to the active packet communication network input / output package and the standby packet communication network input / output package. . The gateway device according to any one of claims 1 to 3, further comprising: a system state holding unit that holds information for determining a system state of the duplicated package in each package. Collect the failure status of the duplicated packages, decide which one to operate as the active system, and control to update the information held in the system status holding unit of each package when system switching occurs The gateway apparatus of any one of Claims 1-4 provided with the system state control part to perform. In the gateway device in which the circuit switched network signal is an optical signal,
The circuit-switched network interface unit converts a circuit-switched network signal input from the circuit-switched network into an electrical signal by converting the signal into an electrical signal, and converts the signal in the device into an optical signal to convert the circuit-switched network signal Converted to
6. The packet communication network interface unit converts a packet signal input from the packet communication network into an in-device signal, and converts the in-device signal into a packet signal by packetizing the packet signal. The gateway device according to any one of the above. The gateway device according to any one of claims 1 to 6, wherein the circuit switching network is an ISDN network, and the packet communication network is an IP network. A signal processing device provided in a gateway device for mutually connecting communication networks of different protocols and having an interface with one of the communication networks, wherein the gateway device is provided in duplicate in an operation system and a standby system. In addition, in the signal processing apparatus having an interface with the second signal processing apparatus that is duplicated in the active system and the standby system at least in the gateway apparatus,
A network interface unit that converts a network signal input from the communication network into an in-device signal, and converts the network signal into a network signal when the in-device signal is input, and sends the signal to the communication network;
In the gateway device, an in-device interface unit that transmits and receives in-device signals to and from the second signal processing device;
A system state holding unit that holds information for determining whether the signal processing device itself and each of the duplexed second signal processing devices is an active system or a standby system,
When the in-device interface unit transmits an in-device signal toward the duplexed second signal processing device, the in-device interface transmits to both the active system and the standby system and the duplexed second signal When receiving the in-device signal from the processing device, discard the in-device signal from the second signal processing device operating as a standby system,
The network interface unit cuts off signal transmission to the communication network when the signal processing device is operating as a standby system. A circuit-switched network interface unit that converts a circuit-switched network signal input from the circuit-switched network into an in-device signal, converts the signal into the circuit-switched network signal when it is input, and sends it to the circuit-switched network; A circuit-switched network input / output package including an in-device interface unit that transmits and receives in-device signals to and from the package, and converts packet signals input from the packet communication network into in-device signals, Packet communication network input / output including a packet communication network interface unit that converts a packet signal into a packet communication network and an in-device interface unit that transmits and receives in-device signals to and from other packages Traffic control method in a gateway device provided with duplicated packages for the active system and standby system,
Input the same circuit switching network signal to the active circuit switching network input / output package and the standby circuit switching network input / output package,
When the in-device interface unit of each circuit switching network input / output package that has been duplicated sends an in-device signal toward the duplicated packet communication network input / output package, it is sent to both the active system and the standby system,
When the in-device interface unit of each duplicated packet communication network input / output package receives an in-device signal from the duplicated circuit-switched network input / output package, the inside of the device from the standby circuit-switched network input / output package Discard the signal,
The packet communication network interface unit shuts off signal transmission to the packet communication network when the packet communication network input / output package including the packet communication network interface unit is operating as a standby system;
Input the same packet signal to the active packet communication network input / output package and the standby packet communication network input / output package,
When the in-device interface of each duplicated packet communication network input / output package sends an in-device signal to the duplicated circuit-switched network input / output package, it is sent to both the active and standby systems. ,
When the in-device interface unit of each circuit switching network input / output package that has been duplicated receives an in-device signal from each duplicated packet communication network input / output package, Discard the in-device signal,
The circuit-switching network interface unit cuts off signal transmission to the circuit-switching network when a circuit-switching network input / output package including the circuit-switching network interface unit operates as a standby system. Control method. When the in-device interface unit included in each package receives an in-device signal from each duplexed package, information for determining the system status of the duplexed package in the package including the in-device interface unit is provided. Based on the information held in the system state holding unit to hold, determine whether to discard the received in-device signal,
The circuit switching network interface unit determines whether to block signal transmission to the circuit switching network based on information held in the system state holding unit of the package including the circuit switching network interface unit,
The packet communication network interface unit determines whether to block signal transmission to the packet communication network based on information held in the system state holding unit of a package including the packet communication network interface unit. 10. The traffic control method according to 9. A signal processing device provided in a gateway device for mutually connecting communication networks of different protocols and having an interface with one of the communication networks, wherein the gateway device is provided in duplicate in an operation system and a standby system. And at least the signal processing program applied to the signal processing device having an interface with the second signal processing device provided in duplicate in the active system and the standby system in the gateway device,
On the computer,
Processing for converting a network signal input from the communication network into an in-device signal;
When an in-device signal is input, it is converted into a network signal and sent to the communication network,
When transmitting an in-device signal toward the duplicated second signal processing device, processing to transmit to both the active system and the standby system,
A process of discarding an in-device signal from a second signal processing device operating as a standby system when receiving an in-device signal from the duplexed second signal processing device; and the computer as a standby system A signal processing program for executing a process of blocking signal transmission to the communication network when operating.

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