JP2012009047A - Disaster prevention information distribution method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To distribute information by adequately and rapidly selecting an appropriate communication network without depending on manpower when a disaster occurs.SOLUTION: When disaster prevention information is distributed to multiple reception terminals by selectively using different communication networks NW1-NW6 when a disaster occurs, a transmission control server CSV successively selects the multiple communication networks NW1-NW6 and determines whether the selected communication network and the reception terminals are in information-transmittable states or not concerning the respective reception terminals. Then, a disaster prevention information content is transmitted to the reception terminals determined to be information-transmittable by way of the selected communication network, and the information content is transmitted by selecting the communication network with a successive priority concerning the reception terminals determined to be information-untransmittable. The procedures of the transmission mentioned above are repeated until there is no more reception terminals determined to be information-untransmittable or until there is no more unselected communication networks among the multiple communication networks.

Description

The present invention relates to a disaster prevention information delivery method and apparatus for delivering important information such as evacuation information between local government bases when a disaster occurs, for example.
About.

  In general, information transmission is performed between local government bases via a communication network such as a self-operated IP (Internet Protocol) network, a regional IP network, a mobile phone network, a general telephone line network, a satellite communication network, and an MCA network. However, if a disaster occurs due to a large earthquake or typhoon, it is assumed that disaster prevention information cannot be transmitted to shelters or disaster prevention personnel due to the occurrence of failures in the communication network or the increase in communication traffic.

  In such a case, conventionally, for example, a staff member generally attempts to communicate with each terminal for each communication network to determine the state of each communication network and select an available communication network. However, this method requires human operation and human judgment to select a communication network, and thus there is a risk that accuracy and speed in selecting a communication network to be used in an emergency situation cannot be secured. is there.

  On the other hand, as a system for automatically distributing information, a distribution medium on which information is to be distributed is selected according to the location of the worker, the information is shaped into a format suitable for the selected distribution medium, and the above-mentioned selection is made. There has been proposed a technique for transmitting the shaped information through a network adapted to a distribution medium (see, for example, Patent Document 1).

Japanese Patent No. 3454740

  However, the above-described conventional system distributes information by selecting an appropriate network according to a specific medium assumed to be possessed by the other party. For this reason, when the communication line is congested or the communication line is interrupted as in the case of a disaster, information cannot be distributed. That is, it cannot be said that it is a system that can guarantee risk avoidance for a communication network failure caused by an external influence.

  The present invention has been made paying attention to the above circumstances, and its purpose is to make it possible to select an appropriate communication network more accurately and quickly without relying on human resources when a disaster occurs, and to distribute information, and It is an object of the present invention to provide an information distribution method and apparatus in which an information distribution operator can check the progress of an information distribution processing procedure at his / her terminal.

  In order to achieve the above object, one aspect of the present invention is to preset a plurality of communication networks when distributing disaster prevention information to a plurality of receiving terminals by selectively using a plurality of different communication networks when a disaster occurs. The selected communication network and the receiving terminal determine whether or not the selected communication network and the receiving terminal are in a state where information transmission is possible for each of the receiving terminals set as the transmission destination, and information transmission is possible. The disaster prevention information is transmitted to the determined receiving terminal via the selected communication network. On the other hand, when there is a receiving terminal determined to be unable to transmit information, the receiving terminal A series of information distribution processing procedures for re-setting as a terminal and selecting the next communication network with the above-described priority order are not selected from among the plurality of communication networks when there are no receiving terminals determined to be unable to transmit the information. There is no communication network In addition, during the repeated execution of the information distribution processing procedure, the communication network selection state transition information indicating which one of the plurality of communication networks is being selected is generated. The selected state transition information is displayed.

Therefore, until there is no receiving terminal that is determined to be unable to transmit information, or there is no unselected communication network among the plurality of communication networks, the communication network is sequentially selected, and whether or not information transmission to the receiving terminal is possible. The information distribution processing procedure including information distribution to the transmittable receiving terminal is automatically and repeatedly executed. That is, an information distribution processing procedure for distributing disaster prevention information while searching for a communication network that can be transmitted is automatically executed. For this reason, it is not necessary to search for a communication network that can be transmitted by a human operation, and it becomes possible to quickly and appropriately select a communication network and perform information distribution processing.
Furthermore, for example, the information distribution operator can check the progress status of the information distribution processing procedure at his / her terminal, thereby indirectly grasping the occurrence status of the communication network congestion.

The present invention is characterized by comprising the following various characteristic components.
The first characteristic component is to process the disaster prevention information to be distributed into a data amount corresponding to the transmission band that can be used in the selected communication network when transmitting the disaster prevention information.
In this way, for example, when disaster prevention information is transmitted through a communication network with a small transmission band, the data amount is automatically reduced or compressed so as to adapt to the transmission band of the communication network. For this reason, disaster prevention information can be smoothly distributed using a limited band.

  A second characteristic component is a value representing the number of receiving terminals capable of transmitting information with respect to the number of receiving terminals set as the transmission destination for each selected communication network during the repeated execution of the information distribution processing procedure, Alternatively, a value representing the number of receiving terminals that cannot transmit information with respect to the number of receiving terminals set as a transmission destination is calculated, and the calculated value is displayed in association with the selected state transition information.

  In this way, the information distribution operator can check the distribution completion rate or the distribution failure rate for each communication network, thereby more accurately grasping the progress of information distribution processing and the congestion status of each communication network. It becomes possible to do.

  That is, according to the present invention, it is possible to select an appropriate communication network more accurately and quickly without relying on human resources when a disaster occurs, and to allow the information distribution operator to execute the information distribution processing procedure at his / her terminal. It is possible to provide an information distribution method and apparatus that can check the progress status.

It is a figure which shows the structure of the transmission control server CSV which is the information delivery apparatus concerning one Embodiment of this invention, and its periphery. It is a figure which shows the physical structure for connecting the transmission control server shown in FIG. 1 to each communication network. It is the figure which showed the logic structure at the time of the transmission control server shown in FIG. 1 switching the connection with respect to each communication network automatically. It is a figure which shows the structure of the delivery flow and data flow which are performed in the transmission control server shown in FIG. It is a flowchart which shows the process sequence and processing content of the monitoring process with respect to a communication network. It is a flowchart which shows the process sequence and processing content of a delivery process of information content. An example of the algorithm of the monitoring process with respect to each communication network is shown. It is a flowchart which shows the main routine of the delivery processing algorithm of information content. It is a flowchart which shows the subroutine of the information delivery algorithm by a private IP network. It is a flowchart which shows the subroutine of the information delivery algorithm by a satellite communication network. It is a flowchart which shows the procedure and content of the subroutine of the information delivery algorithm by a regional IP network. It is a flowchart which shows the procedure and content of the subroutine of the information delivery algorithm by a mobile telephone network. It is a flowchart which shows the procedure and content of the subroutine of the information delivery algorithm which used the telephone line network and the MCA network together. It is a flowchart which shows the subroutine of the information processing procedure in the case of distributing information content using a mobile telephone network, and a processing content. It is a flowchart which shows the subroutine of the information processing procedure in the case of distributing an information content using a telephone line network and a MCA network, and a processing content. It is a figure which shows the sequence at the time of reflecting the monitoring result of each communication network in the delivery processing procedure of the information content performed subsequently. It is a figure which shows the algorithm (matrix) which showed the transition of the specific address at the time of delivering information content. It is a figure which shows the algorithm (matrix) which showed the transition of the specific address at the time of delivering information content. It is a figure which shows the setting example of the setting of MRTG which is a SNMP manager function, and a periodical monitoring. It is a figure which shows the setting example of the setting of MRTG which is a SNMP manager function, and a periodical monitoring. It is a figure which shows the setting example of the setting of MRTG which is a SNMP manager function, and a periodical monitoring. 2 shows a configuration of a setting screen on a client terminal directly operated by a user. It is a figure which shows the example of a display of the state transition information of switching of a communication network. It is a figure which shows the example of a display of the state transition of a communication network switching, and a delivery completion rate.

Embodiments according to the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram showing a configuration of a transmission control server CSV, which is an information distribution apparatus according to an embodiment of the present invention, and its surroundings. The transmission control server CSV is installed, for example, in a disaster prevention center of a local government, and can communicate with the receiving terminal RSV selectively via an arbitrary network among a plurality of communication networks. The plurality of communication networks include, for example, a private IP (Internet Protocol) network NW1, a satellite communication network NW2, a regional IP network NW3, a mobile phone network NW4, a telephone line network NW5, and an MCA (Multi Channel Access) wireless network NW6. It consists of.

  The transmission control server CSV includes, for example, a Web server, and includes a central processing unit (CPU) as hardware and a program memory, a data memory, a database, and various interfaces connected to the CPU via a bus. ing.

  Further, the transmission control server CSV includes, as software, an OS (Operating System), middleware, and a group of application programs executed on these OS and middleware. The application program group includes a user interface (user I / F) AP1, a cooperation interface (cooperation I / F) AP2, an inter-system interface (inter-system I / F) AP3, a group management program AP4, and distribution content creation. A management program AP5, a multiple network automatic distribution control program AP6, and a cooperative control response management program AP7.

  The user interface AP1 transmits / receives commands and data to / from a client terminal TM made up of a personal computer. For example, a process for accepting a message or a command input by a user, a transition of a communication network selection state described later, A process of transmitting display data representing the distribution rate to the client terminal TM is performed.

The cooperation interface AP2 includes individual interface modules that perform cooperation processing for performing communication with the plurality of communication networks NW1 to NW6, and has a module structure that is functionalized for each communication network to be used. Each interface module can be arbitrarily added or deleted by a user operation by the client terminal TM, so that a flexible introduction plan can be studied.
The inter-system interface AP3 transmits / receives data and the like to / from the above-described FAX server and other Web servers having different purposes.

The group management program AP4 performs address management of distribution destinations, and performs individual address registration, individual address deletion, group registration, group deletion, group member setting, and the like according to a user operation by the client terminal TM.
The delivery content creation / management program AP5 creates and manages delivery content such as text, attached files, and FAX-OCR information, and operates in response to a request input from the client terminal TM.

The multiple network automatic distribution control program AP6 controls a series of controls such as switching control of the communication networks NW1 to NW6, monitoring control, acquisition of status information, and distribution control of disaster prevention information in the information distribution process. Operates according to incoming requests.
The cooperation control response management program AP7 manages a series of related response control and data logs such as monitoring results, status information, and distribution result information, and the monitoring results and distribution results according to a request input from the client terminal TM. Display data representing the selected state transition and distribution rate of the communication network is generated based on the above and output to the client terminal TM.

  The receiving terminal RSV is used by a person in charge of disaster prevention at, for example, a branch office, a public hall, a school, an evacuation center, a material collection center, and the like, and includes, for example, a FAX terminal, a personal computer, and a portable terminal. The receiving terminal RSV has a function of receiving and displaying disaster prevention information transmitted from the transmission control server CSV via the communication networks NW1 to NW6.

  FIG. 2 is a diagram showing a physical configuration for connecting the transmission control server CSV to each of the communication networks NW1 to NW6. As shown in the figure, the transmission control server CSV is first connected to the private IP network NW1 and the regional IP network NW3 through the switches SW and then via the routers RT1 and RT2, and to the satellite communication network NW2. After passing through the switch SW, it is connected via the IDU. The telephone line network NW5 is connected via the switch SW and the router RT2 and then via the dial-up router RT3. Further, the mobile phone network NW4 is connected via a mobile module MM, and the MCA radio network NW6 is connected via an MCA modem MC.

  FIG. 3 shows a logical configuration when the transmission control server CSV automatically switches the connection to each of the communication networks NW1 to NW6. As shown in the figure, in the transmission control server CSV, by assigning IP addresses from a LAN (Local Area Network) by PPPoE Protocol, and by performing rLogin (automation) by Telnet Protocol, a plurality of communication networks NW1. The connection to the NW 6 can be switched. Further, information representing the state transition of switching for the communication networks NW1 to NW6 is sent from the transmission control server CSV to the client terminal TM and displayed.

  The parameter setting at the time of switching is performed by line monitoring using echo request packet information (Ping command) defined by ICMP (Internet Control Message Protocol). An example is shown in the figure. ICMP monitoring is performed in the order of priority levels (NW1 to NW3) at the time of system startup, at regular intervals, and triggered by user monitoring start operation. The Ping command is executed 3 times (can be set arbitrarily) at 1 second intervals. After sending this Ping command, it is checked if there is no response from all the receiving terminals within the specified time, that is, whether or not All time out has occurred, and based on this, it is determined whether the communication network can be distributed. The result is displayed on the GUI (Graphical User Interface) of the client terminal TM. However, unicast monitoring is also carried out according to the distribution algorithm when distributing disaster prevention information content.

  The call connection process to the mobile terminal using the mobile phone network NW4 is executed with a transmission destination selection operation as a trigger. Monitoring is performed once in total (can be arbitrarily set), triggered by the end of each monitoring in the wired communication networks NW1 to NW3. As a result of this monitoring, it is confirmed whether or not All time out has occurred, and the result is displayed on the GUI of the client terminal TM. However, unicast monitoring is performed according to the distribution algorithm even during content distribution.

Next, the distribution flow and data flow executed by the transmission control server CSV will be described. FIG. 4 shows an example. In the figure, for simplicity of illustration, the communication networks NW1 to NW6 are represented as (1) to (6), respectively.
In the distribution flow, the standard flow is (1) private IP network, (2) satellite communication network, (3) regional IP network, (4) mobile phone network, and (5) telephone line network, (6) MCA network ( (5) and (6) are functions for automatically switching the ideal line most suitable for distribution according to the ideal band (band order) of each communication network. The user specified flow is as follows: (1) Private IP network, (2) Satellite communication network, (3) Regional IP network, (4) Mobile phone network, (5) Telephone line network, (6 This is a function that enables distribution using the communication network selected and specified by arbitrarily selecting and specifying the MCA network.

  The ideal bandwidth of each communication network is set as follows. That is, the maximum bandwidth 384 kbps of the cellular phone network (4) is set as a threshold for each of the private IP network (1), satellite communication network (2), and regional IP network (3). As a result of monitoring for the private IP network (1), satellite communication network (2), and regional IP network (3), if the available transmission bandwidth falls below the above threshold, monitoring for the mobile phone network (4) Transition. If the monitoring result exceeds the threshold in any of the private IP network (1), satellite communication network (2), and regional IP network (3), disaster prevention information content is distributed using that line. To do. Next, as a result of monitoring the cellular phone network (4), if the transmission bandwidth that can be secured falls below the maximum bandwidth of the telephone network (5), 64kbps, the telephone network (5) And switching to the MCA network (6) and monitoring these networks in parallel.

  The data flow indicates a threshold value when processing the content data to be distributed. As shown in the figure, if the transmission bandwidth that can be secured is within the range of 64kbps to 384kbps as a result of monitoring for the cellular phone network (4), the amount of transmission data is min25.1kb (MCA) according to this bandwidth. Information content is processed so that the maximum transmission amount in the network = 25 kb + 100b “64 kbps≈3.13 s”) to max 47.9 kb. In addition, when using the telephone network (5) and MCA network (6), the information content is retransmitted so that the amount of transmission data is max25kb (transmission time: 3.125s for the telephone network and 3min for the MCA network). Process.

Next, the operation of the transmission control server CSV configured as described above will be described.
(1) Monitoring process for communication network
Prior to the execution of the information content distribution processing procedure, the transmission control server CSV activates the multiple network automatic distribution control program AP6, and executes the monitoring processing procedure for the communication networks NW1 to NW4 in accordance with a preset priority order as follows. . FIG. 5 is a flowchart showing the procedure and processing contents.

  That is, first, line monitoring based on ICMP echo request packet information is performed on the private IP network (1), and information representing the result is notified to the client terminal TM via the user interface AP1. As a result, in the client terminal TM, information indicating the notified monitoring result is displayed on the display unit. Then, the line interface is switched by automatically logging in to the router, and the status information is notified to the client terminal TM via the user interface AP1. As a result, in the client terminal TM, the notified status information is displayed on the display unit.

  Next, line monitoring based on ICMP echo request packet information is performed on the satellite communication network (2) in the same manner as in the case of the private IP network (1), and information representing the result is sent to the client terminal via the user interface AP1. Notify TM and display on display. Similarly, the line interface is switched by automatically logging in to the router, and the status information is notified to the client terminal TM via the user interface AP1 and displayed.

  The series of operations described above are sequentially executed for the local IP network (3) and the cellular phone network (4), and finally the monitoring results for the communication networks (1) to (4) are ANDed. As a result of the AND processing, information indicating whether or not the communication networks (1) to (4) can be used is notified to the client terminal TM via the user interface AP1 and displayed. Specifically, if even one communication network is Lost = 0, it is considered that communication is possible, and the information is notified to the client terminal TM. At this time, if there is a communication network incapable of communication, information indicating in which communication network the problem has occurred is notified to the client terminal TM and displayed.

FIGS. 7A to 7D show examples of monitoring processing algorithms for the communication networks (1) to (4), respectively.
First, for the private IP network (1), various parameters are set for transmitting an ICMP echo request packet in step S111, and the ICMP echo request packet is transmitted in step S112 according to the set parameters. In step S113, it is determined whether or not there is no response from all receiving terminals within a predetermined period (1000 ms), that is, whether or not all time is out. If it is determined that the IP network (1) cannot be used, and if it is not All time out, it is determined in step S115 that the private IP network (1) is usable. Then, a message representing the result of the determination is output to the client terminal TM.

Next, in the same way as in the case of the private IP network (1), various parameters are set for the satellite communication network (2) for transmitting the ICMP echo request packet in step S211, and step S212 is performed according to the set parameters. To send an ICMP echo request packet. In step S213, it is determined whether or not all receiving terminals are All time out. If All time is out, it is determined in step S214 that the satellite communication network (2) is unavailable, while All time out. If not, it is determined in step S215 that the satellite communication network (2) is available. Then, a message representing the result of the determination is output to the client terminal TM.
Similarly, for the local IP network (3), the monitoring process for the receiving terminal using the ICMP echo request packet is performed in steps S311 to S315 in the same procedure as the private IP network (1) and the satellite communication network (2). The message representing the determination result is output to the client terminal TM.

  Finally, after setting parameters corresponding to the portable terminal in step S411, the ICMP echo request packet is transmitted to the cellular phone network (4) in step S412. In step S413, it is determined whether or not All time is out. If All time is out, the mobile phone network (4) is determined to be unusable in step S414. In step S415, the mobile phone network (4) is determined to be usable. Then, a message representing the result of the determination is output to the client terminal TM.

The message indicating the monitoring result of each of the communication networks (1) to (4) determined as described above is used for the information content distribution processing procedure to be subsequently executed. FIG. 16 is a sequence diagram showing the contents.
In other words, if the result of the monitoring process for each of the communication networks (1) to (4) is “All time out” in the communication network, the communication network is excluded from the selection target in the subsequent information content distribution processing procedure. The For example, when the private IP network (1) becomes All time out, the private IP network (1) is excluded in the distribution processing procedure, and the distribution procedure is executed from the next satellite communication network (2). If the satellite communication network (2) becomes All time out, the distribution processing procedure excludes the satellite communication network (2) from the selection target, and the local IP network (1) is followed by the regional IP network. (3) is selected. In this way, in the information content distribution processing procedure, unnecessary monitoring processing for an unusable communication network is not performed again, the processing load on the control server CSV required for distribution is reduced, and Processing time can be shortened.

(2) Overview of information content distribution processing
When the monitoring processing procedure for the communication networks NW1 to NW4 is completed, the transmission control server CSV subsequently executes the information content distribution processing procedure as follows. FIG. 6 is a flowchart showing the processing procedure and processing contents.

  That is, first, in step S11, a unicast monitoring process based on ICMP echo request packet information is executed for the private IP network (1). In this monitoring process, the ICMP monitoring process is executed for the addresses of all receiving terminal nodes registered in advance as distribution destinations in the transmission control server CSV. Then, based on the monitoring result, whether or not communication is possible for each receiving terminal is determined in step S12. If there is a receiving terminal capable of communication (Lost = 0), the corresponding receiving terminal is selected in step S13, Information content is transmitted to the selected receiving terminal in step S14. TCP / IP (Transmission Control Protocol / Internet Protocol) is used as the communication program.

  On the other hand, if there is a receiving terminal determined to be unable to communicate (with Lost), the receiving terminal determined to be unable to communicate is listed in step S15. In step S16, a login to the router for accessing the satellite communication network (2) is automatically made and the line interface is switched. As a result, the connection destination is switched to the satellite communication network (2). At this time, the routing status information is transmitted to the client terminal TM via the user interface AP1.

  Next, in step S21, the transmission control server CSV executes unicast monitoring processing based on ICMP echo request packet information for the satellite communication network (2). In this monitoring process, the ICMP monitoring process is executed only for the address of the receiving terminal determined to be incapable of communication. Then, based on the result of monitoring, whether or not communication is possible for each receiving terminal is determined in step S22. If there is a receiving terminal capable of communication (Lost = 0), the corresponding receiving terminal is selected in step S23, Information content is transmitted to the selected receiving terminal in step S24.

  On the other hand, if there is a receiving terminal determined to be unable to communicate (with Lost), the receiving terminal determined to be unable to communicate is listed in step S25. In step S26, a login to the router for accessing the regional IP network (3) is automatically made, and the line interface is switched. As a result, the connection destination is switched to the regional IP network (3). At this time, routing status information corresponding to the regional IP network (3) is transmitted to the client terminal TM via the user interface AP1.

  Subsequently, in step S31, the transmission control server CSV performs a unicast monitoring process using ICMP echo request packet information for the regional IP network (3) as in the case of the private IP network (1) and the satellite communication network (2). Execute. In this monitoring process, the ICMP monitoring process is executed only for the address of the receiving terminal determined to be unable to communicate as a result of monitoring the satellite communication network (2). Then, based on the result of this monitoring, whether or not communication is possible for each receiving terminal is determined in step S32. If there is a receiving terminal capable of communication (Lost = 0), the corresponding receiving terminal is selected in step S33, Information content is transmitted to the selected receiving terminal in step S34.

  On the other hand, if there is a receiving terminal that is determined to be incapable of communication (with Lost), the receiving terminal that has been determined to be incapable of communication is listed in step S35. In step S36, a login to the router for accessing the cellular phone network (4) is automatically made, and the line interface is switched. As a result, the connection destination is switched to the mobile phone network (4). At this time, routing status information corresponding to the cellular phone network (4) is transmitted to the client terminal TM via the user interface AP1.

  Next, in step S41, the transmission control server CSV sends an ICMP echo request to the cellular phone network (4) as in the case of the private IP network (1), satellite communication network (2), and regional IP network (3). Executes unicast monitoring processing based on packet information. In this monitoring process, the ICMP monitoring process is executed only for the address of the receiving terminal that is determined to be unable to communicate as a result of the monitoring of the regional IP network (3). Based on the result of monitoring, whether or not communication is possible for each receiving terminal is determined in step S42. If there is a receiving terminal capable of communication (Lost = 0), the corresponding receiving terminal is selected in step S43. And after processing content data so that it may become the data amount corresponding to a portable terminal by step S44, the said content data are transmitted toward a receiving terminal by step S45.

  On the other hand, if there is a receiving terminal determined to be unable to communicate (with Lost), the receiving terminal determined to be unable to communicate is listed in step S46. In step S47, the user automatically logs in to the router for accessing the telephone line network (5) and switches the line interface. Subsequently, after selecting the ISDN line in step S51, the content data is processed so that the transmission data amount corresponds to ISDN in step S52, and then the receiving terminal determined to be incapable of communication in step S53. The content data is transmitted to the receiving terminal based on the address, that is, the telephone number + subaddress. PPP (Point to Point Protocol) is used as the historical program.

  In parallel with this, the transmission control server CSV activates the MCA terminal MM in step S61. In step S62, the information content is transferred to the MCA terminal MM via the RS232C cable based on the individual number of the receiving terminal determined to be unable to communicate, and then the MCA terminal on the master station side is further transferred from the MCA terminal MM. And transmit it to the receiving terminal according to the data communication procedure of the MCA line. Then, the client terminal TM is notified of information that finally informs the end of distribution to the client terminal TM via the user interface AP1, and all the distribution processes are completed.

  In the above description, the private IP network (1), satellite communication network (2), regional IP network (3), mobile phone network (4), telephone line network (5), and MCA network (6) are all in order. It was made to choose. However, the information content can be distributed by selecting any communication network in any order by specifying and inputting in advance the desired communication network and its priority order in the client terminal TM. is there.

(3) Information content distribution processing algorithm
FIG. 8 is a flowchart showing a main routine of the information content distribution processing algorithm.
When the multi-network automatic distribution control program AP6 of the transmission control server CSV fetches the monitoring processing result for the communication network as the throughput W, it first determines whether or not the throughput W is 384 kbps or higher in step S141. As a result of this determination, if the throughput W is 384 kbps or higher, the throughput value W is output as a message in step S142, and then information distribution processing using the private IP network (1) is executed in step S143.

  On the other hand, if the throughput W is less than 384 kbps, it is next determined in step S451 whether the throughput W is in the range of 64 kbps ≦ W <384 kbps. As a result, if the throughput W is in the range of 64 kbps ≦ W <384 kbps, the throughput value W is output as a message in step S452, and then the information data is partially extracted in step S453, and the extracted information data In step S454, a process of distributing the information via the mobile phone network (4) is executed.

If the throughput W is not in the range of 64 kbps ≦ W <384 kbps, the process proceeds to step S531, where it is determined whether the throughput W is less than 64 kbps. As a result of the determination, if the throughput W is less than 64 kbps, the throughput value W is output as a message in step S532, and then a part of the information data is further extracted in step S533. In S534, a process of distributing via the telephone line network (5) is executed. In parallel with this, a process of distributing the extracted information data in step S621 via the MCA network (6) is executed.
As a result of the determination, if the throughput W is not less than 64 kbps, it is determined as a program error in step S71 and the process is terminated.

(3-1) Information distribution algorithm by private IP network (1)
Among the main routines of the distribution algorithm shown in FIG. 8, the subroutine of the information distribution algorithm by the private IP network (1) is executed as follows. FIG. 9 is a flowchart showing the procedure and contents.

  That is, first, in step S1431, the number NP of the normally operating receiving terminals and the number RF of the receiving terminals that have not responded are set to initial values (= 0), respectively, and the selection number N of the receiving terminal is initially set in step S1432. Set value = 1. Next, in step S1433, it is determined whether the value of N has reached the total number W of receiving terminals to be distributed. If not, in step S1434, a Ping command is sent to the IP address of the Nth receiving terminal. Send. In step S1435, it is determined whether or not a response to the Ping command is returned within a predetermined time. If it is returned, 1 is added to NP in step S1437, and if one is not returned, RF is returned in step S1436 to RF. Add one. In step S1438, N is incremented, and the process returns to step S1433. Thereafter, the processes in steps S1433 to S1438 are repeated until the value of N reaches the value of W, that is, until monitoring for all receiving terminals is completed.

When monitoring for all the receiving terminals is completed, it is then determined in step S1439 whether or not the number RF of receiving terminals that have not responded is zero. If it is 0, the process proceeds to step S1441 to determine whether or not the number NP of receiving terminals that operate normally is 0. If not, the process proceeds to step S1442 and stores the number of NPs. The information content transmission process is started.
On the other hand, if the RF value is not 0, that is, if there is a receiving terminal that cannot be distributed, the RF value is held in step S1440, and then the distribution processing procedure using the satellite communication network (2) is performed. Transition.

(3-2) Information distribution algorithm using satellite communication network (2)
The subroutine of the information distribution algorithm by the satellite communication network (2) is executed as follows. FIG. 10 is a flowchart showing the procedure and contents.
That is, first, in step S1443, the IP addresses of unsent receiving terminals to be distributed are sequentially read from the database DB, and in step S1444, a Ping command is sequentially transmitted to the IP address. Then, as in the case of the private IP network (1) described above, the number NP of the receiving terminals that normally operate and the number RF of the receiving terminals that have not responded are counted, and monitoring for all the receiving terminals to be distributed is performed. Upon completion, in step S1444 ′, it is determined whether or not the number RF of receiving terminals that have not responded is zero. If it is 0, the process proceeds to step S1446 to determine whether or not the number NP of receiving terminals that operate normally is 0. If not, the process proceeds to step S1447 and stores the number of NPs. The information content transmission process is started.
On the other hand, if the RF value is not 0, that is, if there are still unreceivable receiving terminals, the local IP network (3) is used after holding the RF value in step S1445. Move on to delivery processing procedure.

(3-3) Information distribution algorithm using regional IP network (3)
The subroutine of the information distribution algorithm by the regional IP network (3) is executed as follows. FIG. 11 is a flowchart showing the procedure and contents.
That is, as in the case of using the satellite communication network (2), first, in step S1448, the IP addresses of untransmitted receiving terminals to be distributed are sequentially read from the database DB, and the IP address is pinged in step S1449. Send commands sequentially. Then, as in the case of the private IP network (1) and the satellite communication network (2) described above, the number NP of receiving terminals that normally operate and the number RF of receiving terminals that did not respond are counted. When monitoring for all the receiving terminals to be distributed ends, it is determined in step S1450 whether the number RF of receiving terminals that have not responded is zero. If 0, the process proceeds to step S1452 to determine whether or not the number NP of receiving terminals that operate normally is 0. If not, the process proceeds to step S1453 and stores the number of NPs. The information content transmission process is started.
On the other hand, if the RF value is not 0, that is, if there are still undeliverable receiving terminals, the mobile phone network (4) is used after holding the RF value in step S1451. Move on to delivery processing procedure.

(3-4) Information distribution algorithm using mobile phone network (4)
The subroutine of the information distribution algorithm by the cellular phone network (4) is executed as follows. FIG. 12 is a flowchart showing the procedure and contents.
That is, first, in step S4541, IP addresses of unsent receiving terminals to be distributed are sequentially read from the database DB, and a Ping command is sequentially transmitted to the IP address in step S4542. Then, as in the case of the private IP network (1), satellite communication network (2), and regional IP network (3) described above, the number NP of receiving terminals that normally operate and the number RF of receiving terminals that did not respond are Count each. When monitoring for all the receiving terminals to be distributed ends, it is determined in step S4553 whether or not the number RF of receiving terminals that have not responded is zero. If it is 0, the process proceeds to step S4545 to determine whether or not the number NP of receiving terminals that operate normally is 0. If not, the process proceeds to step S4546 and the number of NPs is stored. The information content transmission process is started.
On the other hand, if the RF value is not 0 in this cellular phone network (4), that is, if there are still unreceivable receiving terminals, the RF value is held in step S4544. The procedure shifts to a distribution processing procedure using both the telephone line network (5) and the MCA network (6).

(3-5) Information distribution algorithm using both telephone network (5) and MCA network (6)
The subroutine of the information distribution algorithm using the telephone line network (5) and the MCA network (6) is executed as follows. FIG. 13 is a flowchart showing the procedure and contents.
That is, in the subroutine using the telephone network (5), first, the selection number N of receiving terminals is initialized (= 1) in step S5341, and then in step S5342, the N is the total number of receiving terminals W to be distributed. It is determined whether or not it has been reached. If the result of this determination has not been reached, the IP address of the receiving terminal is converted into a telephone number by referring to the database in step S5343, and is not distributed without being distributed in each higher-level communication network (1) to (4). The value of N is added to the number of remaining receiving terminals RN {}. When the above process ends, N is incremented in step S5345, and the process returns to step S5342. Thereafter, until the value of N reaches the value of W, that is, until the process of converting the IP address to the telephone number for all the receiving terminals and counting the number of undelivered receiving terminals RN {} is completed, step S5342 is completed. The process in step S5345 is repeated.

  When the above processing for all the receiving terminals is completed, it is determined in step S5346 whether or not the number of undelivered receiving terminals RN {} is zero. If it is not 0, the process proceeds to step S5347 to store the number of undelivered receiving terminals RN {}, and then the information content transmission process is performed.

  On the other hand, in the subroutine using the MCA network (6), first, the selection number N of receiving terminals is initialized (= 1) in step S6211. Then, in step S6212, the N reaches the total number W of receiving terminals to be distributed. Determine whether or not. If the result of this determination has not been reached, the IP address of the receiving terminal is converted into a telephone number by referring to the database in step S6212, and is not distributed without being distributed in each of the upper communication networks (1) to (4). In step S6213, the value of N is added to the number of remaining receiving terminals RN {}. When the above process ends, N is incremented in step S6214, and the process returns to step S6211. Thereafter, until the value of N reaches the value of W, that is, until the process of converting the IP address to the telephone number for all the receiving terminals and counting the number of undelivered receiving terminals RN {} is completed, step S6211 is performed. -The process by step S6214 is repeated.

  When the above processing for all the receiving terminals is completed, it is determined in step S6215 whether or not the number of undelivered receiving terminals RN {} is zero. If it is not zero, the process proceeds to step S 6216 to store the number of undelivered receiving terminals RN {}, and then performs information content transmission processing.

(4) Information processing (4-1) When distributing using mobile phone network When distributing information content using mobile phone network (4), the results of monitoring for mobile phone network (4) When the transmission band is in the range of 64 kbps to 384 kbps, the ideal band of information content exceeds the transmission band. Therefore, in this case, the information content is processed as follows. FIG. 14 is a flowchart showing a subroutine of the processing procedure and processing contents.

  That is, first, in step S4531, the data amount of the transmission content is input. In step S4532, it is determined whether the input data amount is less than 48 kbytes. If the result of this determination is that the amount of data is less than 48 kbytes, processing proceeds directly to information content distribution processing. On the other hand, if the data amount is 48 kbytes or more, in step S4533, the information is in the range of min25.1 kbytes (maximum transmission amount in the MCA network (6): 25 kbytes + 100 bytes “64kbps≈3.13 sec”) to max47.9 kbytes. Process content.

(4-2) When using the telephone line network and the MCA network for distribution When the information content is distributed using the telephone line network (5) and the MCA network (6), the transmission band detected by monitoring is Since it is 64 kbps to 384 kbps, the ideal band of information content exceeds the transmission band. Therefore, in this case, the information content is processed as follows. FIG. 15 is a flowchart showing a subroutine of the processing procedure and processing contents.

  That is, first, in step S5331, the data amount of the transmission content is input. Next, in step S5332, it is determined whether the input data amount is 25 kbytes or less. As a result of this determination, if the data amount is 25 kbytes or less, the process proceeds to information content distribution processing. On the other hand, if the amount of data exceeds 25 kbytes, in step S5333, the information content is reprocessed so as to be max25 kbytes (transmission time: 3.125 sec for the telephone line network and 3 min for the MCA network).

(5) Data Flow Sheet for Information Content Distribution FIGS. 17 to 18 are algorithms (matrixes) showing the transition of unique addresses when information content is distributed. In the distribution process, a unique address associated with the distribution is automatically selected (transitioned) using the line interface switching as a key, and distribution in each subroutine is performed based on the address information. In addition, it has a data structure in units of blocks, and all judgments can be made instantaneously.

For example, in the case of the private IP network (1), information contents are distributed based on the address information indicated by the arrow DT1 in FIG. 17, and in the case of the satellite communication network (2), the address information is DT2. In the case of the regional IP network (3), the address information transitions to that indicated by the arrow of DT3. When the mobile phone network (4) is changed, the address information is changed to the one indicated by the arrow in DT4 of FIG. 18, and the phone network (ISDN network) (5) and the MCA network (6) are transferred. In this case, the transition is made to that indicated by the arrow in DT5.
By managing the address information as described above, it is possible to manage a series of addresses for each terminal with respect to one receiving terminal.

(6) Setting of MRTG (Multi Router Traffic Grapher) and Setting of Periodic Monitoring Setting of MRTG and the setting of periodic monitoring which are SNMP (Simple Network Management Protocol) manager functions are performed as shown in FIGS. 19 to 21, for example. .

(7) Setting Screen on Client Terminal FIG. 22 shows the configuration of the setting screen on the client terminal TM that is directly operated by the user.
As shown in this figure, the destination selection menu includes three items, “simultaneous”, “group”, and “individual”, and a destination can be selected from these three. For “group” and “individual”, it is possible to specify “group” and “individual” destinations from the pull-down menu. In the network selection menu, there are "Private IP network", "Satellite communication network", "Regional IP network", "Mobile phone network", "Telephone network", "MCA network". A desired communication network can be arbitrarily selected from the communication networks.

  The monitoring start button is used when the user causes the monitoring process to be executed at an arbitrary timing. Normally, the monitoring process is automatically executed when the system is started and periodically. However, by providing the monitoring start button, any timing monitoring process of the user can be executed. The pull-down button is operated when confirming detailed monitoring information. A window for displaying status information and a transmission result is provided at a position adjacent to the pull-down button, and a detailed status log and transmission result detailed information are displayed according to the selection operation of the pull-down button. In addition, a text transmission information input screen, attachment file designation, and OCR fax data calling (inter-server cooperation with a fax server) function are provided, as well as transmission function storage and transmission of transmission information. Information can also be deleted.

(8) Display of communication network switching state transition information and distribution rate When the communication network switching processing is performed in the information content distribution processing procedure, the transmission control server CSV generates display data indicating the switching state transition. The display data is sent to the client terminal TM via the user interface AP1 and displayed on the display unit. FIG. 23 shows a display example. In this example, a mascot is displayed on the currently selected communication network.

  At the same time, when the information content is distributed to the receiving terminal via the selected communication network, the distribution completion rate is calculated and the calculation result is displayed in association with the mascot. The distribution completion rate (%) is calculated by dividing the number of receiving terminals determined to be distributed as a result of monitoring by the total number of receiving terminals set as distribution targets and multiplying the result by 100.

FIG. 24 shows a display example of the state transition of the switching of the communication network and the distribution completion rate. (1) Private IP network, (2) Satellite communication network, (3) Regional IP network, (4) Mobile phone Examples of changes are shown in the order of network, (5) telephone line network, and (6) MCA network.
Thus, by displaying the state transition of the communication network switching and the distribution completion rate in the client terminal TM2 during the distribution processing of the information content, the user can check the distribution status of the disaster prevention information content in real time. .

  As described above, in this embodiment, a plurality of private IP networks NW1, satellite communication networks NW2, regional IP networks NW3, mobile phone networks NW4, telephone line networks NW5, and MCA networks NW6 that are different when a disaster occurs are selectively used. When the disaster prevention information is distributed to the receiving terminal, the transmission control server CSV sequentially selects the plurality of communication networks NW1 to NW6 according to a preset priority order, and the selected communication network and the receiving terminal are information Whether or not transmission is possible is determined for each receiving terminal set as a transmission destination. When the disaster prevention information content is transmitted to the receiving terminal determined to be capable of information transmission via the selected communication network, while there is a receiving terminal determined to be unable to transmit information. The procedure of resetting the receiving terminal as a destination terminal and selecting the communication network with the next highest priority and transmitting the information content is no longer received by the receiving terminal that is determined to be unable to transmit the information. The process is repeated until there is no unselected communication network among the plurality of communication networks.

  Therefore, an information distribution processing procedure for searching for a receiving terminal capable of transmitting information through the communication network while sequentially selecting the communication network and distributing the disaster prevention information content is automatically executed. For this reason, it is not necessary to search for a communication network that can be transmitted by a human operation, and it becomes possible to quickly and appropriately select a communication network and perform information distribution processing.

  In addition, prior to the execution of the above-described series of information distribution processing procedures, monitoring is performed by selecting a plurality of communication networks in order according to the priority order and determining whether the communication network and the receiving terminal are in a state where information transmission is possible. If a communication network that cannot transmit information to all receiving terminals is detected as a result of this monitoring process, as shown in FIG. The detected communication network is excluded from the target. Accordingly, in the information distribution processing procedure, only a communication network capable of transmitting information is selected, and a communication network is selected, whether information transmission is possible, and the like, thereby improving information distribution efficiency.

  Further, when transmitting the disaster prevention information, the disaster prevention information to be distributed is processed so as to have a data amount that can be transmitted through the communication network according to the transmission band available in the communication network. Therefore, for example, when disaster prevention information is transmitted through the mobile telephone network NW4, telephone line network NW5, and MCA network NW6, which have a smaller transmission band compared to the private IP network NW1, regional IP network NW3, etc., it can be used in these communication networks. The amount of transmission data is automatically reduced or compressed so as to adapt to a different transmission band. For this reason, disaster prevention information can be smoothly distributed using a limited band.

  Further, during the repeated execution of the information distribution processing procedure, the communication network selection state transition information indicating which of the plurality of communication networks is being selected is generated, and the generated selection state transition information is transmitted to the client. It is displayed on the terminal TM. Therefore, the user can confirm the progress status of the information distribution processing procedure at the client terminal TM, thereby indirectly grasping the occurrence status of the congestion of the communication network.

  In addition, during the repeated execution of the information distribution processing procedure, a distribution completion rate representing the number of receiving terminals capable of transmitting information with respect to the number of receiving terminals set as the transmission destination is calculated for each selected communication network, and this calculation is performed. The delivered distribution completion rate is displayed on the client terminal TM in association with the selected state transition information. Therefore, the user can confirm the distribution completion rate for each communication network, and thereby can more accurately grasp the progress of information distribution processing and the congestion status of each communication network.

  The present invention is not limited to the above embodiment. For example, the Ping command is a status test for confirming the end point reachability in the IP connection. For this reason, it is assumed that communication cannot be confirmed with the ping command. Therefore, although not a standard specification, as an additional function, it is conceivable to use dummy packet data in FTP (File Transfer Protocol) which is a communication confirmation means in a TCP (Transmission Control Protocol) connection.

This confirmation means sends FTP dummy packet data from the transmission control server CSV to the communication network. And, when the data transfer is normally completed, the function of returning ACK (ACKnowledgement: positive reply sent from the destination computer to the source computer in communication between computers) is used, Based on the transmission timing of the FTP dummy packet data and the reception timing of the ACK, the present bandwidth of the communication network is estimated.
For example, when (packet size × 8) / time taken = current bandwidth,
Packet size: 48,000byte
FTP dummy packet data transmission timing: AM8: 00.00.000
ACK reception timing: AM8: 00.00.500
48,000 bytes x 8 = 384 kbps
384kbps / 0.5 = 768kbps
Current bandwidth = 768kbps
It becomes.

  The above description will be described with reference to FIGS. 5 and 6. ICMP monitoring is FTP dummy packet monitoring, and in other cases, the Ping command is a dummy packet. Further, in order to perform the FTP monitoring, an FTP monitoring button is provided on the operation screen of the client terminal TM as shown in FIG. 22, for example. When the user presses the FTP monitoring button as necessary, the FTP control processing procedure is executed by the transmission control server CSV.

  In the above-described embodiment, the case where the private IP network NW1, the satellite communication network NW2, the regional IP network NW3, the cellular phone network NW4, the telephone line network NW5, and the MCA network NW6 are used as an example of the communication network to be selected has been described. However, other communication networks can be used.

  In addition, regarding the configuration of the transmission control server and its control procedure and control content, especially the specific method of monitoring, the distribution procedure of information content, the processing content of information content according to the transmission band available in the communication network, etc. Various modifications can be made without departing from the scope of the present invention.

  In short, the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

  CSV ... Transmission control server, RSV ... Receiving terminal, NW1 ... Private IP network, NW2 ... Satellite communication network, NW3 ... Regional IP network, NW4 ... Mobile phone network, NW5 ... Telephone line network, NW6 ... MCA network, AP1 ... User interface (User I / F), AP2 ... Cooperation interface (Cooperation I / F), AP3 ... Inter-system interface (Inter-system I / F), AP4 ... Group management program, AP5 ... Distribution content creation / management program, AP6 ... Multiple networks Automatic distribution control program, AP7 ... cooperation control response management program.

Claims (6)

A disaster prevention information distribution method for distributing disaster prevention information from an information distribution device to a plurality of receiving terminals by selectively using a plurality of different communication networks when a disaster occurs,
A first step of selecting the communication network according to a priority set in advance for the plurality of communication networks;
A second step of determining, for each of the receiving terminals set as transmission destinations, whether or not the selected communication network and receiving terminal are in a state capable of transmitting information;
A third process of transmitting the disaster prevention information via the selected communication network to a receiving terminal determined to be able to transmit information in the second process;
In a case where there is a receiving terminal that is determined to be unable to transmit information in the second process, the receiving terminal is reset as a destination terminal, and the priority order selects the next communication network. Repeating the process until there is no receiving terminal determined to be unable to transmit the information or there is no unselected communication network among the plurality of communication networks,
In addition, during the repeated execution of the first process to the fourth process, selection state transition information of the communication network indicating which of the plurality of communication networks is being selected is generated, and the generated selection state A disaster prevention information delivery method characterized by further executing a process of displaying transition information.   2. The third process according to claim 1, wherein when transmitting disaster prevention information, the disaster prevention information to be distributed is processed so as to have a data amount corresponding to a transmission band usable in the selected communication network. Disaster prevention information delivery method.   During the repeated execution of the first to fourth steps, a value representing the number of receiving terminals that can transmit information for the number of receiving terminals set as the destination for each selected communication network, or as a destination Calculating a value representing the number of receiving terminals that cannot transmit information to the set number of receiving terminals, and further displaying the calculated value in association with the selected state transition information. The disaster prevention information delivery method according to claim 1. A disaster prevention information distribution device that selectively uses a plurality of different communication networks to distribute disaster prevention information to a plurality of receiving terminals when a disaster occurs,
First means for selecting the communication network according to a priority set in advance for the plurality of communication networks;
A second means for determining, for each of the receiving terminals set as a transmission destination, whether or not the selected communication network and the receiving terminal are in a state capable of transmitting information;
Third means for transmitting the disaster prevention information via the selected communication network to a receiving terminal determined to be capable of transmitting information by the second means;
When there is a receiving terminal that is determined to be unable to transmit information by the second means, the receiving terminal is reset as a destination terminal, and the priority order selects the next communication network. Means,
Control for repeatedly executing the processing from the first means to the fourth means until there is no receiving terminal determined not to be able to transmit information or there is no unselected communication network among the plurality of communication networks. Means,
During the repeated execution of the first means to the fourth means, the communication network selection state transition information indicating which one of the plurality of communication networks is being selected is generated, and the generated selection state transition is generated. A disaster prevention information distribution apparatus comprising: means for displaying information on a display means. The third means includes
Means for processing the disaster prevention information to be distributed into a data amount corresponding to a transmission band usable in the selected communication network;
The disaster prevention information distribution apparatus according to claim 4, further comprising: a unit configured to transmit the processed disaster prevention information to the distribution target receiving terminal.   During the repeated execution of the first to fourth means, a value representing the number of receiving terminals capable of transmitting information for the number of receiving terminals set as the destination for each selected communication network, or as a destination Further executing means for calculating a value representing the number of receiving terminals that cannot transmit information for the set number of receiving terminals and displaying the calculated value in association with the selected state transition information on the display means. 5. The disaster prevention information distribution apparatus according to claim 4.

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