JP2018174404A - COMMUNICATION CONTROL DEVICE, COMMUNICATION CONTROL METHOD, AND PROGRAM - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continue an Internet connection to a home gateway device even if a fixed line is disconnected. SOLUTION: A gateway device 11 capable of connecting to the Internet via both a fixed line network 21 and a mobile line network 31 is used. Normally, the mobile line network 31 rejects the Internet connection from the gateway device 11, and when the connection between the one gateway device 11 and the fixed line network 21 is cut off, the connection from the one gateway device is temporarily cut off. When the connection between the one gateway device 11 and the fixed line network 21 is restored, the connection from the one gateway device 11 is refused again. [Selection diagram] Fig. 1

Description

  The present invention relates to a system for maintaining the Internet connection of a user who regularly uses a fixed line.

  In today's life, an internet connection environment is becoming essential. The connection to the Internet is roughly divided into a route using a fixed line such as an optical fiber, a cable TV line, and an ADSL line, and a route using a mobile communication network such as LTE. In recent years, the communication speed of mobile communication networks has been greatly improved. However, since the mobile communication network uses a limited frequency band in the public space, there is a limit to the cost reduction of the Internet connection via the mobile communication network. On the other hand, a fixed line such as an optical fiber has a low operation cost after being laid once, and provides a high-speed Internet connection service at a substantially fixed charge. In particular, many personal computers do not have a SIM card slot for using a mobile communication network, and are connected to the Internet via a home gateway (hereinafter abbreviated as HGW) connected to a fixed line via a wired or wireless LAN. It is common to connect to.

  As described above, since the mobile communication network and the fixed line are provided side by side, it is generally performed in combination with each other as a usage form of the user. With mobile phones equipped with wireless LAN functions, such as smartphones, for example, when you are at home, you can connect to the Internet using a fixed line via a wireless LAN instead of a mobile communication network. In general, an offload technology that suppresses soaring of resources and suppresses resource consumption in a frequency band is generally performed (for example, Patent Document 1). Such an offload technology is also useful as an emergency avoidance means when a failure occurs in the mobile communication network.

Japanese Unexamined Patent Publication No. 2015-023303

  However, even with a fixed line, disconnection failure can occur with a low frequency. When a failure occurs in a fixed line such as a broken optical fiber core wire, a specific work for the failure location is required. However, the fixed line is an infrastructure that extends over a long distance, and it may take time and effort to reach a repair person after the failure point is identified. Especially in mountainous areas, it can take serious time. However, it is too expensive to use a mobile communication network regularly, and resources in the frequency band are wasted.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to realize an environment that can provide an alternative route urgently and maintain a stable Internet connection at a low cost in an environment where a fixed line is used regularly. .

This invention
Internet connection is possible via both fixed line network and mobile line network,
A terminal manager device belonging to controlling connection to the fixed line network;
A mobile line authentication unit belonging to controlling the connection to the mobile line network;
In a communication control device system having a gateway device that can communicate with each other,
The gateway device is
Normally, Internet connection through the mobile line network is refused by the mobile line authentication unit,
When the connection with the terminal management unit is disconnected, the mobile line authentication unit according to an instruction from the terminal management unit is temporarily permitted to connect to the Internet through the mobile line network,
When the connection with the terminal management unit is restored, the mobile line authentication unit according to the instruction from the terminal management unit is refused the Internet connection through the mobile line network.
The communication control device solves the above problem.

  That is, the mobile phone is configured so that the gateway device is provided with a connection environment not only via the fixed line network but also via the mobile line network, and in the normal state, the Internet connection via the mobile line network is rejected. Set on the operator side. Since the gateway device is connected through the fixed line network in a normal state, it is possible to avoid a communication charge on the user without squeezing the frequency band. During operation, it is monitored whether or not the connection between the gateway device of each user and the terminal management unit is maintained. If the connection with one gateway device is broken, it is considered that a failure has occurred, and the terminal management unit instructs the mobile line authentication unit to permit the connection with the one gateway device. Send a release notification to do. Upon receiving the release notification, the mobile line authentication unit changes the setting of the one gateway device so as to allow connection to the mobile line network. On the other hand, the one gateway device that has been disconnected from the terminal management unit transmits a connection instruction to the mobile line authentication unit so that a route for Internet connection passes through the mobile line network. This connection request is allowed, and the one gateway device can temporarily maintain the Internet connection environment for the subordinate terminals using the mobile line network. When the failure recovery work is completed and the connection between the one gateway device and the terminal management unit is recovered, the terminal management unit again refuses the connection of the one gateway device to the mobile line authentication unit. Send a disconnection instruction to instruct. Upon receiving this disconnection instruction, the mobile line authentication unit rejects the connection of the one gateway device. The rejected gateway device returns to the Internet connection via the fixed line network.

Specifically, it can be realized by a communication control system having the following configuration.
Fixed network interface that can be connected to the Internet via the fixed line network of the fixed communication line operator
A mobile network interface that can be connected to the Internet via the mobile phone carrier's mobile network
And a local network interface that provides an internet connection environment to the terminal under control,
And a connection destination network database for registering a first connection setting to be used for Internet connection and a second connection setting to be used with priority next.
A gateway device installed for each contractor,
A terminal management unit that belongs to the fixed line network and is connectable to an alternative network database that records contents corresponding to the connection destination network database, and monitors a connection state with each of the gateway devices;
It is connectable to a connection permission database that belongs to the mobile line network, registers the gateway device so as to be identifiable, and records whether or not the Internet connection is possible via the mobile line network for each of the gateway devices, A mobile line authentication unit that determines whether or not to accept a connection request from the gateway device according to the availability;
Have
The connection destination network database is normally set to use the fixed line network as the first connection setting,
The above connection permission database is set to refuse Internet connection under normal circumstances.
When the connection between the one gateway device and the terminal management unit is disconnected, the mobile line authentication unit changes the setting of the connection permission database for the one gateway device to connection permission,
When the connection between the one gateway device and the terminal management unit is restored, the mobile line authentication unit changes the setting of the connection permission database for the one gateway device to connection rejection.

  By adopting the configuration of the present invention, it is possible to quickly switch to the Internet connection via the mobile line network in the event of a failure while maintaining the Internet connection without using a mobile line network that is usually expensive and compresses the communication band. Can continue to maintain the Internet connection environment.

1 is a block diagram showing a configuration example of a communication control system including a communication control device according to the present invention and a connection destination thereof. The flowchart which shows the embodiment example in the normal time of the communication control system including the communication control apparatus which concerns on this invention, and its connection place The flowchart which shows the embodiment example at the time of failure of the communication control system including the communication control apparatus according to the present invention and its connection destination The flowchart which shows the example of an embodiment at the time of recovery of the communication control system including the communication control apparatus concerning this invention and its connection point

  Hereinafter, the present invention will be described in detail together with specific embodiments. The present invention is a communication control apparatus that maintains an Internet connection environment even when a failure occurs in a fixed line, a communication control system that controls the communication control system, a communication control method, and a program that executes these.

  An embodiment of a communication control system that implements the communication control method according to the present invention is shown in FIG. This communication control system communicates to a communication control device, which is a gateway device 11 (abbreviated as HGW in the figure) that provides an Internet connection environment mainly for a terminal 10 connected to a LAN in a general home or business office. Is a system that provides a stable Internet connection environment.

  The gateway device 11 has a local network interface 15 that provides an Internet connection environment to the terminal 10 under its control. In the figure, a wired LAN is shown as an example, but a wireless LAN interface may be used. Further, although it is directly connected to the terminal 10, a bridge or other repeater may be sandwiched between them.

  The gateway device 11 has a fixed network interface 13 that can be connected to the Internet via a fixed line network 21 of a fixed communication line operator. Examples of the fixed line network 21 include an optical fiber network, a cable television network, an ADSL network, and an ISDN network. Although not shown, an optical modem, a cable TV modem, an ADSL modem, or the like may be separately provided, or those functions may be built in the casing of the gateway device 11.

  The gateway device 11 has a mobile network interface 14 that can be connected to the Internet via the mobile phone network 31 (31a) of the mobile phone operator. For convenience of communication speed, it is desirable to have a mobile network function after the third generation. For example, there are WiMAX (Worldwide Interoperability for Microwave Access), LTE (Long Term Evolution), and subsequent fourth generation standards. Specifically, general antennas corresponding to these communication standards and SIM card slots for reading SIM (Subscriber Identity Module) cards issued by mobile phone operators corresponding to the respective communication standards Equipped with equipment for connection to various mobile phone operators. Note that the mobile line network 31 to be connected is not limited to one type, and a plurality of mobile line operators' mobile line networks 31a, 31b, 31c,... When the communication standards of the plurality of mobile line networks 31 are different from each other, the corresponding antenna is provided. When the communication standards are compatible, the SIM card slot is used for each mobile phone carrier. It is good to have more than one.

  The gateway device 11 has a connection destination network database 12 for registering a first connection setting used for Internet connection and a second connection setting used with priority next. Further, the third and fourth connection settings may be included to be used with priority after the next. Of the above-mentioned fixed line network 21 and mobile line networks 31a, 31b, 31c,..., The first connection setting that has the highest priority in the normal state is set to perform connection via the fixed line network 21. deep. In accordance with the setting of the connection destination network database 12, the gateway device 11 performs the first connection setting which has the highest priority in normal times, that is, the Internet connection via the fixed line network 21.

  It is desirable that the gateway device 11 keeps the contents of the connection destination network database 12 with the most up-to-date state of highly reliable information about only the connectable networks. Therefore, a connectable network for confirming the state of the network interface connected to the fixed line network 21 or the mobile line network 31a or the like, or confirming the state of the SIM card inserted in the SIM card slot of the mobile network interface 14 It is advisable to check regularly. It should be noted that in the mobile line network 31 to be described later, a response to this confirmation may be allowed permanently.

  The fixed line network 21 is a network of the fixed communication line provider, and the gateway device 11 is connected to the Internet 41 via this. Although not shown, the connection to the Internet 41 may be made through a separate provider network or directly from the fixed carrier network.

  Connected to the fixed line network 21 is a terminal management unit 22 that monitors the connection state with the gateway apparatus 11 installed for each individual contractor. The terminal management unit 22 may be a single device or may be used as another server. Although execution is possible even if it exists in the cloud, it is desirable to be directly connected to the fixed line network 21 for the role of monitoring the network. As a connection state monitoring means, a general method such as ping exchange may be used. If no response is obtained, it is determined that the connection is disconnected.

  The terminal management unit 22 can be connected to an alternative network database 23 in which contents corresponding to the connection destination network database 12 included in each gateway device 11 are recorded. The alternative network database 23 may be stored as a separate server in the fixed line network 21 or may be directly connected to the terminal management unit 22.

  The mobile line network 31 (31a, 31b...) Is a network of the mobile phone carrier. The gateway device 11 can select individual networks of the mobile phone operators according to the information of the SIM card mounted in the SIM card slot of the mobile network interface 14 and connect to them.

  The mobile line network 31 (31a, 31b...) Is connected with a mobile line authentication unit 32 that determines whether or not an Internet connection request from each gateway device can be made and changes it. The mobile line authentication unit 32 may be a single device, or may be used as another server. Note that although it can be executed even if it exists in the cloud, it is desirable that it is directly connected to the mobile line network 31 for the role of monitoring the network. In addition, in order to manage the availability, the mobile line authentication unit 32 registers each gateway device 11 in an identifiable manner, and determines whether or not each gateway device 11 can be connected to the Internet via the mobile line network. Can be connected to the connection permission database 33 that records The connection permission database 33 may be stored as a separate server in the mobile line network 31 or may be directly connected to the mobile line authentication unit 32. As information for registering so as to be identifiable, for example, a telephone number registered in the SIM card, a payout IP address, a physical address of the gateway device 11, contractor information, or the like can be used. This information needs to be information that can identify each gateway device 11 as common with the alternative network database 23. In the connection permission database 33, whether to connect to the Internet from the gateway device 11 is denied by default. This is because the gateway device 11 is normally operated so as to be connected to the Internet through the fixed line network 21. However, the mobile line authentication unit 32 does not block all communication from the gateway device 11 whose rejection of the connection permission database 33 is denied, but continues to exchange packets such as a test of whether or not the network is connectable. It is desirable to make it possible. This is because it is desirable to periodically perform test communication between the gateway device 11 and the mobile line authentication unit 32 in order to enable quick Internet connection in an emergency.

  A communication control method in the communication control system having these configurations will be described. In the normal state, each gateway device 11 performs Internet connection through the fixed line network 21. At this time, the terminal management unit 22 periodically executes connection state confirmation means for confirming whether the connection state with each gateway device 11 can be maintained.

  Further, in the normal state, the device that can update the terminal management unit 22 or other alternative network database 23 periodically receives the contents of the connection destination network database 12 from each gateway device 11, and substitutes according to the content. An alternative route collection means for updating the contents of the network database 23 may be executed periodically.

  When the terminal management unit 22 confirms that the connection with the one gateway device 11 is disconnected, the mobile terminal authentication unit 32 refers to the record of the alternative network database 23 for the disconnected gateway device 11. Then, the alternative route search means for obtaining which mobile line network 31a, 31b,... The terminal management unit 22 issues a connection instruction for temporarily permitting the Internet connection for the one gateway device 11 to the mobile line authentication unit 32 of the mobile line network 31a having the next highest priority or the connection permission database 33. A connection instruction transmitting means for transmitting is executed. The mobile line authentication unit 32 or the connection permission database 33 that has received the connection instruction executes a temporary rejection means for changing the value of the connection permission database 33 to connection permission for the one gateway device 11. In accordance with the changed value, the mobile line authentication unit 32 executes temporary acceptance means for temporarily permitting Internet connection from the gateway device 11. When one of the gateway devices 11 confirms that the connection state with the terminal management unit 22 has been disconnected, the gateway device 11 requests the next priority mobile line network 31a to connect to the Internet according to the information recorded in the connection destination network database 12. The alternative connection request means is executed. Since it is changed so as to be permitted by the mobile line authentication unit 32, the gateway device 11 can continue to connect to the Internet via the mobile line network 31a.

  Thereafter, the terminal management unit 22 continues to try to confirm the connection with the one gateway device 11. During this time, the location where the failure has occurred is discovered and human work is performed to resolve it. When the connection between the one gateway device 11 and the terminal management unit 22 is restored, the connection via the mobile line network 31 is stopped and the connection via the fixed line network 21 is switched. At this time, the notification accompanying the restoration to the mobile line network 31 may be transmitted from the gateway device 11 or from the terminal management unit 22.

  When notifying from the terminal management unit 22, a disconnection instruction transmission unit that transmits a disconnection instruction to the mobile line authentication unit 32 or the connection permission database 33 so as to refuse the Internet connection again for the one gateway device 11 is executed. To do. The mobile line authentication unit 32 or the connection permission database 33 that has received this disconnection instruction changes the value of the connection permission database 33 to connection refusal for the one gateway device 11. The mobile line authentication unit 32 again rejects the Internet connection from the gateway device 11 according to the changed value. When one gateway device 11 confirms that the connection state with the terminal management unit 22 has been recovered, or confirms that the Internet connection via the mobile line network 31a has been rejected, the gateway device 11 records in the connection destination network database 12. According to the information, the Internet connection is requested to the fixed line network 21 having the highest priority. Thereafter, the normal state is restored.

  When notifying from the gateway device 11, the gateway device 11 confirms that the connection state with the terminal management unit 22 has been restored, and then uses the route to the already connected mobile line network 31 to perform the above disconnection. A connection release notification means for notifying the mobile line authentication unit 32 of the same content as the instruction is executed. Further, the changed priority order of the connection destination network database 12 is returned to the original one, or the processing which is selected so that the second or lower place is returned to the fixed line network 21 set to the first place is performed. After that, the gateway device 11 executes a fixed line connection recovery means for connecting again through the fixed line network 21.

  If the connected network database 12 and the alternative network database 23 are registered not only with the next-priority mobile line network 31a but also with the next best mobile line networks 31b, 31c,. When the connection is disconnected, the connection instruction may be transmitted to the other mobile line networks 31b, 31c,. In this case, the gateway apparatus 11 makes a connection request to the mobile line network 31a, and if there is also a failure, the gateway apparatus 11 uses the mobile line networks 31b, 31c,. Try to connect to the Internet.

  A specific example embodiment will be described with a flow. FIG. 2 is an example of a flow in a normal state and registration preparation. If the gateway apparatus 11 is installed, it connects from the fixed line network 21 (S111). At this time, the gateway device 11 registers the connection information of the fixed line network 21 as the highest priority item in its connection destination network database 12. At the same time, initial report means for reporting the connection information together with the identification information is executed to the alternative network database 23 (S112). In response to this report, the terminal management unit 22 executes initial registration means for registering the identification information of the gateway device 11 in the alternative network database 23 (S113).

  Next, after the SIM card is mounted on the gateway device 11, mobile line registration means for registering information on connection to the mobile line network 31 a corresponding to the SIM card in the alternative network database 23 is executed. According to this information, the mobile line initial connection means for connecting from the mobile network interface 14 to the mobile line network 31a is executed (S121). The mobile line authentication unit 32 issues an IP address and enables connection (S122). The gateway device 11 that has received the issued IP address executes mobile line information preparation means for registering information including the IP address in the item of the mobile line network 31a in the connection destination network database 12 (S123). Then, the registered IP address is reported to the terminal management unit 22 together with the above identification information and information for identifying the mobile line network 31 to be connected. The terminal management unit 22 updates the item of the gateway device 11 in the alternative network database 23 (S124). Further, the terminal management unit 22 executes an initial rejection instruction means for instructing the connected mobile line network 31 to reject the connection of the gateway device 11 (S125). The connection permission database 33 is set so as to reject the connection of the gateway device 11. Through the above procedure, the gateway apparatus 11 is connected to the Internet via the fixed line network 21 having the highest priority while maintaining the settings of both the fixed line network 21 and the mobile line network 31. This is the normal state.

  In the normal state, the alternative route collection unit is periodically executed together with the connection state confirmation unit (131 to S138). The gateway device 11 confirms connectable networks from the fixed network interface 13 and the portable network interface 14 (S132). If the registered network is disconnected or the new network is communicable (S133 → Yes), the contents are registered in the connection destination network database 12 (S134), and the contents are stored in the alternative network database 23. Report (S135). Receiving this, the terminal management unit 22 performs the above alternative route collection means for updating the contents of the alternative network database 23 in accordance with the received contents (S136). If the connection information to the new mobile line network 31b is included therein, the above-mentioned initial rejection instruction means is executed for the mobile line network 31b (S137, S125).

  FIG. 3 shows an example of a processing flow when a failure occurs. In the normal state, the connection state confirmation unit is continuously executed (S211). When a failure occurs, it is determined whether or not the failure is in the access section between the gateway device 11 and the terminal management unit 22 (S212). If it is not a problem on the route, the failure according to the present invention cannot be avoided (S212 → No). A failure on the route is detected by the gateway device 11 and the terminal management unit 22 being able to communicate with each other separately (S213, S221). Here, the gateway device 11 tries to change the connection destination (S214). If the information of the mobile line network 31 that is the next priority alternative is registered in the connection destination network database 12 (S215 → Yes), the above alternative connection that attempts to connect to the mobile line network 31a that is the alternative destination The requesting means is executed (S216). At this time, the priority information of each network in the connection destination network database 12 may be temporarily switched and restored after the restoration, or the first place is disconnected while the priority information remains unchanged. It is good also as processing which gives priority to 2nd or less.

  On the other hand, the terminal management unit 22 refers to the record for the gateway device 11 in the alternative network database 23, and executes the above alternative route search means for confirming the mobile line networks 31a, 31b. (S222). For all the mobile line networks 31a, 31b,... That have been confirmed, the gateway apparatus 11 executes the connection instruction transmitting means for transmitting a connection instruction for temporarily permitting Internet connection (S223). Receiving this, the mobile line authentication unit 32 executes the above-described temporary rejection means for changing the value of the connection permission database 33 to connection permission for the one gateway device 11 in the connection permission database 33 (S231). In accordance with the changed value, the mobile line authentication unit 32 executes the temporary reception unit that temporarily permits the Internet connection from the gateway device 11 (S232). Since there may be a time lag between S216 and S232, the gateway device 11 may make a connection request repeatedly for a predetermined number of times. Thereafter, the gateway device is connected via the mobile line network 31 until the failure is recovered.

  FIG. 4 shows an example of a processing flow at the time of recovery. While the connection is made through the mobile line network 31 (S311), the fixed line operator performs the recovery work. Once recovered (S312), communication between the gateway device 11 and the terminal management unit 22 is connected. If the communication with the gateway device 11 is possible, the terminal management unit 22 updates the IP address and other information about the gateway device 11 in the alternative network database 23 (S321). Then, the gateway apparatus 11 is notified that the Internet connection via the fixed line network 21 is possible (S322). The gateway device 11 that has received the notification restores the priority order of the connection destination network database 12 (S313). When the fixed line network 21 is again changed to the highest priority state, the connection release notification means is executed so that the mobile line network 31 refuses the Internet connection of the gateway device 11 itself again (S314). Receiving this, the mobile line authentication unit 32 updates the record of the gateway device 11 in the connection permission database 33 (S323), and cancels the Internet connection of the gateway device 11 (S324). The released gateway device 11 (S315) executes the above-described fixed line connection recovery means, and thereafter continues the Internet connection via the fixed line network 21.

DESCRIPTION OF SYMBOLS 10 Terminal 11 Gateway apparatus 12 Destination network database 13 Fixed network interface 14 Mobile network interface 15 Local network interface 21 Fixed line network 22 Terminal management part 23 Alternative network database 31, 31a, 31b Mobile line network 32 Mobile line authentication part 33 Connection permission Database 41 Internet

Claims (8)

Internet connection is possible via both fixed line network and mobile line network,
A terminal management unit for controlling connection to the fixed line network;
A mobile line authentication unit for controlling connection to the mobile line network;
Communication control device that is a gateway device capable of mutual communication between
The gateway device is
Normally, Internet connection through the mobile line network is refused by the mobile line authentication unit,
When the connection with the terminal management unit is disconnected, the mobile line authentication unit according to an instruction from the terminal management unit is temporarily permitted to connect to the Internet through the mobile line network,
When the connection with the terminal management unit is restored, the mobile line authentication unit according to the instruction from the terminal management unit is refused the Internet connection through the mobile line network.
Communication control device. Fixed network interface that can be connected to the Internet via the fixed line network of the fixed communication line operator
A mobile network interface that can be connected to the Internet via the mobile phone carrier's mobile network
And a local network interface that provides an internet connection environment to the terminal under control,
And a connection destination network database for registering a first connection setting to be preferentially used for Internet connection and a second connection setting to be preferentially used next.
A gateway device installed for each contractor,
The fixed network interface for a terminal management unit that monitors a connection state with each of the gateway devices connected to an alternative network database that records contents corresponding to the connection destination network database and belongs to the fixed line network Can be connected through
It belongs to the mobile line network, registers the gateway device in an identifiable manner, records whether or not the Internet connection via the mobile line network is recorded for each gateway device, and normally refuses the Internet connection. Connected via a mobile network interface to a mobile line authentication unit that is connected to a connection permission database and determines whether or not to accept a connection request from the gateway device according to the availability.
The connection destination network database is normally set to use the fixed line network as the first connection setting,
Normally, Internet connection through the mobile line network is refused by the mobile line authentication unit,
When the connection with the terminal management unit is cut off, the mobile line authentication unit in response to changing the setting of the connection permission database to connection permission according to an instruction from the terminal management unit Is temporarily allowed to connect to the Internet through
When the connection with the terminal management unit is restored, the mobile line authentication unit responding to the change of the connection permission database setting to connection refusal by an instruction from the terminal management unit through the mobile line network. Internet connection refused,
Communication control device. A gateway device capable of connecting to the Internet via both a fixed line network and a mobile line network;
A terminal management unit belonging to the fixed line network;
A mobile line authentication unit belonging to the mobile line network;
In a communication control system having
The mobile line authentication unit normally refuses Internet connection through the mobile line network from the gateway device,
When the connection between the one gateway device and the terminal management unit is disconnected, the mobile line authentication unit temporarily permits the connection from the one gateway device according to an instruction from the terminal management unit. And
When the connection between the one gateway device and the terminal management unit is restored, the mobile line authentication unit rejects the connection from the one gateway device again in response to an instruction from the terminal management unit. Control system. Fixed network interface that can be connected to the Internet via the fixed line network of the fixed communication line operator
A mobile network interface that can be connected to the Internet via the mobile phone carrier's mobile network
And a local network interface that provides an internet connection environment to the terminal under control,
And a connection destination network database for registering a first connection setting to be preferentially used for Internet connection and a second connection setting to be preferentially used next.
A gateway device installed for each contractor,
A terminal management unit that belongs to the fixed line network and is connectable to an alternative network database that records contents corresponding to the connection destination network database, and monitors a connection state with each of the gateway devices;
It is connectable to a connection permission database that belongs to the mobile line network, registers the gateway device so as to be identifiable, and records whether or not the Internet connection is possible via the mobile line network for each of the gateway devices, A mobile line authentication unit that determines whether or not to accept a connection request from the gateway device according to the availability;
Have
The connection destination network database is normally set to use the fixed line network as the first connection setting,
The above connection permission database is set to refuse Internet connection under normal circumstances.
When the connection between the one gateway device and the terminal management unit is disconnected, the mobile line authentication unit changes the setting of the connection permission database for the one gateway device to connection permission,
When the connection between the one gateway device and the terminal management unit is restored, the mobile line authentication unit changes the setting of the connection permission database for the one gateway device to connection rejection. Internet connection is possible via both fixed line network and mobile line network,
A terminal management unit for controlling connection to the fixed line network;
A mobile line authentication unit for controlling connection to the mobile line network;
The communication control device, which is a gateway device that can communicate with each other, normally refuses the Internet connection through the mobile line network by the mobile line authentication unit,
When the connection with the terminal management unit is disconnected, the mobile line authentication unit according to an instruction from the terminal management unit temporarily allows Internet connection through the mobile line network,
When the connection with the terminal management unit is restored, the mobile line authentication unit according to the instruction from the terminal management unit causes the Internet connection through the mobile line network to be rejected.
Communication control method. Fixed network interface that can be connected to the Internet via the fixed line network of the fixed communication line operator
A mobile network interface that can be connected to the Internet via the mobile phone carrier's mobile network
And a local network interface that provides an internet connection environment to the terminal under control,
And a connection destination network database for registering a first connection setting to be preferentially used for Internet connection and a second connection setting to be preferentially used next.
A gateway device installed for each contractor,
A terminal management unit that belongs to the fixed line network and is connectable to an alternative network database that records contents corresponding to the connection destination network database, and monitors a connection state with each of the gateway devices;
It is connectable to a connection permission database that belongs to the mobile line network, registers the gateway device so as to be identifiable, and records whether or not the Internet connection is possible via the mobile line network for each of the gateway devices, A mobile line authentication unit that determines whether or not to accept a connection request from the gateway device according to the availability;
For a communication control system having
The connection destination network database is normally set to use the fixed line network as the first connection setting,
The above connection permission database is normally set to refuse Internet connection,
When the connection between the one gateway device and the terminal management unit is disconnected, the mobile line authentication unit changes the setting of the connection permission database for the one gateway device to connection permission,
When the connection between the one gateway device and the terminal management unit is restored, the mobile line authentication unit changes the setting of the connection permission database for the one gateway device to connection rejection,
Communication control method. Internet connection is possible via both fixed line network and mobile line network,
A terminal management unit for controlling connection to the fixed line network;
A mobile line authentication unit for controlling connection to the mobile line network;
A communication control device that is a gateway device capable of mutual communication between
Normally, Internet connection through the mobile line network is refused by the mobile line authentication unit, and Internet connection through the fixed line network is made.
When the connection with the terminal management unit is disconnected, the mobile line authentication unit according to an instruction from the terminal management unit is temporarily permitted to connect to the Internet through the mobile line network. Connect to the Internet via the mobile network,
When the connection with the terminal management unit is restored, the mobile line authentication unit in response to an instruction from the terminal management unit rejects the Internet connection through the mobile line network, and then the fixed line network A program to run to connect to the Internet via Fixed network interface that can be connected to the Internet via the fixed line network of the fixed communication line operator
A mobile network interface that can be connected to the Internet via the mobile phone carrier's mobile network
And a local network interface that provides an internet connection environment to the terminal under control,
And a connection destination network database for registering a first connection setting to be preferentially used for Internet connection and a second connection setting to be preferentially used next.
A gateway device installed for each contractor
The fixed network interface for a terminal management unit that monitors a connection state with each of the gateway devices connected to an alternative network database that records contents corresponding to the connection destination network database and belongs to the fixed line network Can be connected through
It belongs to the mobile line network, registers the gateway device in an identifiable manner, records whether or not the Internet connection via the mobile line network is recorded for each gateway device, and normally refuses the Internet connection. Connected to the connection permission database and executed so as to be connectable via the mobile network interface to the mobile line authentication unit that determines whether the connection request from the gateway device is possible according to the availability.
And,
The connection destination network database is normally set to use the fixed line network as the first connection setting.
Normally, Internet connection through the mobile line network is refused by the mobile line authentication unit, and Internet connection through the fixed line network is made.
When the connection with the terminal management unit is cut off, the mobile line authentication unit in response to changing the setting of the connection permission database to connection permission according to an instruction from the terminal management unit Is temporarily allowed to connect to the Internet through the mobile phone network,
When the connection with the terminal management unit is restored, the mobile line authentication unit responding to the change of the connection permission database setting to connection refusal by an instruction from the terminal management unit through the mobile line network. A program that allows you to connect to the Internet via the fixed-line network after being denied access to the Internet.

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