JP2013207762A - Communication system, safety confirmation method, and communication terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently perform safety confirmation in disaster or the like.SOLUTION: A communication system includes a plurality of communication terminals and a management server which can communicate with the plurality of communication terminals. The communication terminal acquires positional information when receiving emergency information, notifies the management server of the positional information and power amount information and transmits an answer to safety confirmation information corresponding to the emergency information as a representative terminal or a peripheral terminal in a predetermined group on the basis of communication means in receiving the safety confirmation information from the management server. The management server collects the positional information and the power amount information from the communication terminal, groups one or a plurality of communication terminals on the basis of the collected positional information, selects a representative terminal from among communication terminals in the same group on the basis of the power amount information, transmits the safety confirmation information and peripheral terminal information to the selected representative terminal and receives safety result information on the representative terminal and the peripheral terminal from the representative terminal.

Description

  The present invention relates to a communication system, a safety confirmation method, and a communication terminal for efficiently confirming safety at the time of a disaster or the like.

  2. Description of the Related Art Conventionally, there is a system that automatically confirms safety for a registered user in cooperation with weather information when a disaster such as an earthquake occurs. For example, conventionally, a safety confirmation mail is transmitted all at once from the system, and a user who has received the safety confirmation mail collects safety confirmation information by replying his / her own situation from an email reply or the web. As for the collected safety information, the administrator checks the safety status of each user by browsing a screen provided on the web or the like (see, for example, Patent Document 1).

JP 2003-186980 A

  In the conventional system as described above, when a disaster occurs, simultaneous delivery of e-mail etc. is performed to all target persons from each company's system etc. to the mobile terminal network, and it is safe by replying to e-mail or replying via the web Confirmation will be performed.

  Therefore, in the above-described conventional method, a large amount of mail transmission / reception is performed, which increases the load on the server and infrastructure, and increases the time required to distribute emergency information to all terminals. Become. Therefore, depending on the mobile carrier, restrictions may be imposed due to communication congestion, and if the distribution time becomes long, it is conceivable that mail or the like will not reach the middle due to carrier restrictions or the like.

  In addition, the user who has received the safety confirmation mail in the conventional method performs a retry operation many times due to restrictions, and as a result, there is a concern that the battery is consumed and the portable terminal becomes unusable.

  In view of such a problem, the disclosed technique aims to efficiently confirm safety in a disaster or the like.

  A communication system according to an aspect of the disclosure is a communication system including a plurality of communication terminals and a management server capable of communicating with the plurality of communication terminals. When the communication terminal receives emergency information, the communication terminal Corresponding to the emergency information from the management server, the information notifying means for notifying the management server of the position information acquired by the position information acquiring means, and the power information. Control means for controlling to send an answer to the safety confirmation information as a representative terminal or a peripheral terminal in a predetermined group based on the communication means when the safety confirmation information is received, the management server, Information collecting means for collecting position information and electric energy information from the communication terminal, and based on the position information obtained by the information collecting means; Grouping means for grouping one or a plurality of communication terminals; representative terminal selection means for selecting a representative terminal from communication terminals in the same group obtained by the grouping means based on the power amount information; The safety confirmation information and surrounding terminal information including communication terminal information within the same group are transmitted to the representative terminal, and safety result information of the representative terminal and the surrounding terminals is received from the representative terminal. Transmitting and receiving means.

  According to the disclosed technology, it is possible to efficiently confirm safety in a disaster or the like.

It is a figure which shows an example of the system configuration | structure of the communication system in this embodiment. It is a figure which shows an example of a function structure of a communication terminal. It is a figure which shows an example of the hardware constitutions in a communication terminal. It is a figure which shows an example of a function structure of a management server. It is a figure which shows an example of the hardware constitutions in a management server. It is a sequence diagram which shows an example of a safety confirmation process. It is a flowchart which shows an example of the safety confirmation processing procedure in a communication terminal. It is a flowchart which shows an example of the safety confirmation processing procedure in a management server. It is a figure which shows an example of grouping. It is a figure which shows an example of the battery information for selecting a proxy terminal. It is a figure which shows the example of selection of the representative terminal at the time of resending. It is a figure which shows an example of surrounding terminal information.

  Hereinafter, embodiments will be described in detail with reference to the accompanying drawings.

<Communication system: schematic configuration example>
FIG. 1 is a diagram illustrating an example of a system configuration of a communication system according to the present embodiment. A communication system 10 shown in FIG. 1 includes a communication terminal 11 and a management server 12, and the communication terminal 11 and the management server 12 can transmit and receive data via a communication network 13 represented by the Internet, for example. Connected in a state. Note that, when communicating with the communication terminal 11, data transmission / reception by radio waves is performed via the base station 14.

  The communication terminal 11 is a terminal possessed by each user, for example. Examples of the communication terminal 11 include a mobile phone, a smartphone, a tablet terminal, a notebook personal computer (PC), a game terminal, and a music playback device, but are not limited thereto.

  The communication terminal 11 has a function of receiving emergency bulletins (emergency information) at the time of disasters such as earthquakes, tsunamis, and fires, and at the time of reception, the management server 12 receives positional information and power information (for example, battery information). The remaining amount (the remaining amount of electricity stored in the storage battery) is transmitted. In addition, the communication terminal 11 performs safety confirmation communication with the representative terminal selected by the management server 12 by short-range communication.

  The communication terminal 11 may be set as a representative terminal by the management server 12 (for example, the communication terminals 11-1a and 11-1b in FIG. 1). In that case, the communication terminal 11 confirms the safety of the communication terminals 11 belonging to the same group grouped by the management server 12, and transmits the result to the management server 12. The representative terminal receives from the management server 12 information necessary for local communication (short-range communication) with other communication terminals (peripheral terminals) in the same group, and sends them to all terminals in the group or individual terminals. On the other hand, safety confirmation information is transmitted using local communication, and a response is received from the communication terminal 11 of the transmission destination.

  The management server 12 is an information processing device for confirming the safety of a user who uses the communication terminal 11. The management server 12 acquires, for example, position information and power amount information (for example, battery remaining amount) transmitted from the communication terminal 11 that has received the emergency bulletin, and one or more included in a predetermined area from the acquired position information The communication terminals 11 are grouped as one group. In the example of FIG. 1, there are two groups, group A and group B, the group A includes communication terminals 11-1a to 11-6a, and the group B includes communication terminals 11-1b to 11-5b. Is included.

  Moreover, the management server 12 selects a representative terminal among the communication terminals 11 included in each group (for example, the communication terminals 11-1a and 11-1b in FIG. 1). In addition, when selecting a representative terminal, in this embodiment, although a representative terminal is selected based on the electric energy information of each communication terminal 11 in the same group, for example, it is not limited to this. In addition, the management server 12 causes the selected representative terminal to confirm safety with other communication terminals 11 in the same group, and transmits the result.

  The communication terminal 11 selected as the representative terminal transmits / receives data to / from other communication terminals 11 and communicates with the management server 12, so that the battery is consumed heavily. Therefore, for example, the management server 12 reselects the representative terminal from among the communication terminals 11 not selected as the representative terminal among the communication terminals 11 in the same group, and performs another communication with the reselected representative terminal. Safety confirmation with the terminal 11 is performed, and the result is transmitted. The management server 12 may change the representative terminal periodically according to, for example, the battery status, and may change the representative terminal when retransmitting the safety confirmation with another communication terminal 11. However, the present invention is not limited to this.

  Furthermore, the management server 12 may select not only one representative terminal within the same group but also a plurality of representative terminals. Thereby, the load and power consumption of each representative terminal can be reduced.

  The management server 12 manages the safety result information transmitted from the representative terminal via the base station 14 and the communication network 13. In addition, the management server 12 performs the above-described process until the safety result of the communication terminal 11 that has transmitted the position information and the power amount information is acquired, for example. For example, when there is a communication terminal 11 for which safety confirmation cannot be obtained even after a predetermined time has elapsed since reception of position information and electric energy information, the management server 12 generates some accident in that region (group). It is possible to provide a function such as notifying the fire department or the police. Furthermore, the management server 12 may transmit the emergency bulletin described above to the communication terminal 11.

  The base station 14 is a relay device that relays data transmission / reception between the communication terminal 11 and the management server 12. In the example of FIG. 1, the base station 14 transmits / receives data to / from each communication terminal 11 by radio wave communication, and transmits / receives data to / from the management server 12 via the communication network 13. In addition, the base station 14 is arrange | positioned at each area of each area, for example.

  Here, for example, in order to reduce the load on the infrastructure such as the management server 12 or the communication network 13 after a disaster occurs, means for reducing the number of communication terminals 11 communicating with the management server 12 as much as possible is necessary. . Therefore, the management server 12 collects information from each communication terminal 11 when the communication terminal 11 receives the emergency bulletin immediately before the occurrence of the disaster, groups the collected communication terminals 11 and selects from the grouped groups. Communicate with the representative terminal. The information collected from each communication terminal 11 is, for example, the latest position information and the latest battery remaining amount at the time when the communication terminal 11 receives the emergency bulletin, but is not limited thereto. For example, time information when the battery is fully charged or time information from when the battery is fully charged to the present time may be included. In addition, the representative terminal performs safety confirmation with respect to other communication terminals in the same group, and transmits the result to the management server 12.

  Thereby, in this embodiment, with respect to the problem of battery consumption of the communication terminal 11, a terminal with a small remaining battery capacity performs short-distance communication (local communication) with low power consumption with the representative terminal, so that carrier regulation or the like To avoid battery consumption due to useless operations such as retransmission operations. In the present embodiment, communication with the management server 12 can be performed while considering battery consumption.

  Since each communication terminal communicates after the disaster occurs, the amount of data on the communication network 13 becomes enormous and congestion occurs. In the present embodiment, the communication terminal 11 communicates with the communication terminal 11 at the reception stage of the disaster bulletin immediately before the disaster occurs. Since communication is performed, communication can be performed efficiently before congestion occurs. Note that the representative terminal acquires information for realizing communication with the other communication terminals 11 from the management server 12, but the present invention is not limited to this. For example, software for executing each process of the present embodiment is installed. At this stage, it may be registered in advance in storage means such as a memory. In the present embodiment, for example, when the software described above is installed in the communication terminal 11, the representative terminal may store information for realizing communication with other communication terminals 11 in the management server 12.

  Furthermore, in this embodiment, when the communication terminal 11 finishes the process as the representative terminal, information for realizing communication with the other communication terminal 11 obtained from the management server 12 may be deleted. Good. Next, a functional configuration example and a hardware configuration example of the communication terminal 11 and the management server 12 described above will be specifically described.

<Communication terminal 11: Functional configuration example>
FIG. 2 is a diagram illustrating an example of a functional configuration of the communication terminal. In addition, about the functional structure of the communication terminal 11 shown below, about the part which has the same function structure as the function shown above, the same code | symbol shall be attached | subjected and specific description here is abbreviate | omitted.

  The communication terminal 11 shown in FIG. 2 includes an input unit 21, an output unit 22, a storage unit 23, a first communication unit 24, a second communication unit 25, a power acquisition unit 26, an application activation unit 28, The information notification unit 29, the energy saving setting unit 30, the mail transmission / reception unit 30, the screen generation unit 32, and the control unit 33 are included.

  The input means 21 accepts various inputs such as start / end of various instructions related to safety confirmation processing, input of settings, and the like from a user or the like who uses the communication terminal 11. The input means 21 may be a touch panel type input using a screen, for example, or may be input using an operation key or the like. Further, the input means 21 may be input by voice or the like. In that case, the input means 21 has voice input means such as a microphone.

  The output unit 22 outputs the content input by the input unit 21 and the content executed based on the input content. Note that the output unit 22 has a display unit such as a display when outputting by screen display, for example, and has an audio output unit such as a speaker when outputting by voice. The input unit 21 and the output unit 22 may be integrated with input / output, such as a touch panel.

  The storage unit 23 stores various information necessary for the present embodiment. In addition, the storage unit 23 can read various stored information at a predetermined timing as needed, and can write an execution result related to the safety confirmation process. The storage unit 23 stores one or a plurality of application software activated by the application activation unit 28.

  The storage means 23 is a collection of various types of information as described above, and is a database systematically configured so that such information can be searched and extracted using, for example, keywords. You may have the function of.

  The first communication unit 24 and the second communication unit 25 perform data transmission / reception with an external device. The first communication unit 24 mainly transmits and receives data with the management server 12 (including the base station 14), and the second communication unit 25 performs short-range communication with other communication terminals 11 and the like.

  Specifically, the first communication unit 24 is a communication unit for transmitting / receiving data to / from the management server 12. That is, the first communication unit 24 has a communication function with a carrier communication network including the base station 14. Note that the first communication unit 24 has a larger communication area than the second communication unit 25, but is slow in speed and highly dependent on the place. In addition, the first communication unit 24 consumes more power in data transmission / reception than the second communication unit 25. The first communication unit 24 receives the emergency bulletin (emergency information) described above.

  The second communication means 25 performs short-range communication with other communication terminals 11 in the same group if it is the representative terminal, and performs short-range communication with the representative terminal if it is not the representative terminal. If the user is the representative terminal, the safety confirmation information is transmitted to the target communication terminal 11 based on the communication terminal information in the same group obtained from the management server 12. Further, the second communication means 25 acquires safety result information obtained from the other communication terminal 11. The acquired information is temporarily stored in the storage means 23, for example, and transmitted to the management server 12 by the first communication means 24 at a predetermined timing such as when a request from the management server 12 is received, for example. Is done.

  Further, when the second communication unit 25 is not the representative terminal, the second communication unit 25 receives the safety confirmation information obtained from the representative terminal, and transmits a response (safety result information) to the received safety confirmation information to the representative terminal. As the second communication means 25, specifically, infrared communication, optical wireless communication, WiFi (registered trademark), Bluetooth (registered trademark), or the like can be used, but is not limited thereto. The second communication unit 25 has a higher communication speed than the first communication unit 24, but the communication area is limited. In addition, the second communication unit 25 consumes less power in data transmission / reception than the first communication unit 24.

  The power acquisition unit 26 monitors the amount of power of the internal power supply in the communication terminal 11 constantly or at predetermined time intervals. Specifically, the power acquisition unit 25 detects the remaining amount (hereinafter referred to as “battery remaining amount”) of a battery (storage battery) that is an internal power supply, for example, at regular intervals or at predetermined time intervals. The power acquisition means 26 also monitors information on the time when the internal power supply is fully charged.

  The position information acquisition unit 27 acquires the current position information of the communication terminal 11. The position information can be acquired using, for example, a Global Positioning System (GPS) function, but is not limited to this. Further, the position information acquired by the position information acquisition unit 27 may include not only actual position information such as latitude, longitude, altitude, but also acquired time information. The power acquisition unit 26 and the position information acquisition unit 27 described above function as an acquisition unit.

  When the application starting unit 28 receives the emergency bulletin or the like obtained by the first communication unit 24, the application starting unit 28 executes a predetermined application stored in the storage unit 23 in advance. With this application, the above-described processing by the power acquisition unit 26 and the position information acquisition unit 27, the processing by the information notification unit 29 and the energy saving setting unit 30 described later, and the like are performed.

  The information notifying unit 29 acquires the current power amount information (for example, remaining battery capacity) and the current position information by the program started by the application starting unit 28 when the emergency bulletin or the like is received, and the acquired information Is sent to the management server 12 via the first communication means 24. The information notification means 29 manages the current power amount information and the current position information, including the time when the battery was fully charged last time, the position information acquired by the position information acquisition means 27 several minutes before the present, and the like. The server 12 may be notified.

  For example, after transmitting the position information and the power amount information described above to the management server 12, the energy saving setting unit 30 switches to the power save mode (power saving mode) in order to suppress power consumption as much as possible. Further, the energy saving setting means 30 activates only necessary communication / functions in order to save battery while waiting for reception of safety confirmation information from the management server 12 or the representative terminal as a power save mode. .

  In the present embodiment, for example, the above-described switching may not be performed by a user setting or the like. Further, the energy saving setting unit 30 can be set to perform the second communication unit 25 instead of the first communication unit 24 when communicating with the management server 12, for example. As a result, the power consumption during transmission / reception is more efficiently reduced to realize energy saving.

  The mail transmission / reception means 31 receives, for example, a mail when sending / receiving safety confirmation from the management server 12 or the representative terminal, and receives the mail and the reply information (answer mail). Send to the representative terminal.

  The screen generation unit 32 generates content to be displayed on the screen of the output unit 22. Specifically, the screen generation unit 32 notifies the user of, for example, a mail screen, time information, communication quality status (for example, whether or not out of communication range), communication with the representative terminal, and the like. A screen or the like can also be generated. The screen generation unit 32 causes the output unit 22 to output each generated screen.

  The control means 33 controls the entire configuration of the communication terminal 11. For example, the control unit 33 controls various processes such as communication by the first communication unit 24 and the second communication unit 25, power acquisition, position information acquisition, application activation, information notification, energy saving setting, mail transmission / reception, and screen generation. Further, the control means 33 performs control in data transmission / reception with the management server 12, the base station 14, and other communication terminals 11.

<Communication terminal 11: Hardware configuration example>
FIG. 3 is a diagram illustrating an example of a hardware configuration in the communication terminal. The communication terminal 11 shown in FIG. 3 includes a microphone 41, a speaker 42, a display 43, a wireless unit 44, an operation unit 45, a position information acquisition unit 46, a short-range communication unit 47, a power unit 48, A power detection unit 49, a memory 50, and a central processing unit (CPU) 51 are included.

  The microphone 41 inputs a voice uttered by the user and other sounds. The speaker 42 outputs the other party's voice or sounds such as ringtones.

  The display 43 displays time information, information related to whether or not the communication area is outside, information indicating that it is functioning as a proxy terminal, mail information, address information, user information, character data, image data, and the like. The display 43 includes, for example, a liquid crystal display (LCD), but is not limited thereto.

  The wireless unit 44 receives an electric wave signal (communication data) from the management server 12 transmitted from the base station 14 using an antenna or the like, and transmits an electric wave signal (communication data) to the base station 14. It is a transmission / reception unit. The wireless unit 44 corresponds to the first communication unit 24 described above, for example.

  The operation unit 45 is an input unit that is pressed by the user when setting various functions, when creating an answer to a mail, when registering a telephone number, or when making or receiving a call. The operation unit 45 corresponds to, for example, the input unit 21 described above.

  The position information acquisition unit 46 acquires position information using, for example, the GPS function described above. The position information acquisition unit 46 corresponds to the position information acquisition unit 27 described above, for example.

  The short-range communication unit 47 performs short-range communication (local communication) with other communication terminals 11. For example, the short-range communication unit 47 performs short-range communication directly between the communication terminals 11 using infrared communication. The short-range communication unit 47 performs short-range communication with the communication terminal 11 via a relay device such as a wireless router. The short-range communication unit 44 corresponds to the second communication unit 25 described above.

  The power unit 48 supplies power to each component of the communication terminal 11. The power unit 48 is, for example, an internal power source such as a battery, but is not limited thereto, and includes, for example, an external power source.

  The power detection unit 49 detects the amount of power of the internal power supply of the power unit 48 constantly or at predetermined time intervals. The power detection unit 49 corresponds to the power acquisition unit 26 described above, for example.

  The memory 50 is a storage means for storing various types of information in the communication terminal 11, and can write and read information. The memory 50 is, for example, a ROM (Read Only Memory) or a RAM (Random Access Memory), but is not limited thereto. Here, the ROM stores a program for executing the safety confirmation process according to the present embodiment. The RAM stores various data data for executing the above-described safety confirmation process.

  The CPU 51 controls processing of the communication terminal 11 such as various operations and input / output of data with each hardware component based on a control program such as an OS (Operating System) and an execution program stored in the memory 50. To do. The CPU 51 performs processing based on a program stored in the memory 50 in advance. Specifically, the CPU 51 controls, for example, wireless signal transmission / reception in the wireless unit 44, display control on the display 43, operation content detection processing on the operation unit 45, short-range communication control in the short-range communication unit 47, and information to the memory 50. Write / read.

  With the hardware configuration described above, the safety confirmation process in the communication terminal 11 of the present embodiment can be executed. Further, by installing the execution program, it is possible to easily realize the safety confirmation process in the communication terminal 11 by a computer or the like.

<Management Server 12: Functional Configuration Example>
FIG. 4 is a diagram illustrating an example of a functional configuration of the management server. The management server 12 shown in FIG. 4 includes input means 61, output means 62, storage means 63, communication means 64, information collection means 65, grouping means 66, representative terminal selection means 67, and mail transmission / reception. Means 68, totaling means 69, and control means 70 are provided.

  The input unit 61 accepts various inputs such as start / end of various instructions related to safety confirmation processing, input of setting information, and the like from an administrator of the management server 12. For example, if the input means 61 is a PC or the like, the input means 61 includes a keyboard and a mouse. Further, the input means 61 may be input by voice or the like. In that case, the input means 61 has voice input means such as a microphone.

  The output means 62 outputs the contents input by the input means 61 and the contents executed based on the input contents. Note that the output unit 62 includes a display unit such as a display if the output is performed by, for example, screen display, and an audio output unit such as a speaker if the output is performed by voice.

  The storage unit 63 stores various types of information necessary in the present embodiment. Specifically, contents such as position information and power amount information, grouping information, representative terminal information, safety confirmation information, safety result information, and the like transmitted from each communication terminal 11 are stored in the storage unit 63. In addition, the storage unit 63 can read various stored information at a predetermined timing, and can write an execution result related to the safety confirmation process, if necessary. The storage means 63 is a collection of various types of information as described above, and is a database structured systematically so that such information can be searched and extracted using keywords or the like, for example. You may have the function of.

  The communication unit 64 transmits / receives data to / from one or a plurality of communication terminals 11. Specifically, the communication unit 64 transmits / receives data to / from the first communication unit 24 of the communication terminal 11 via the base station 14 or the like. The communication unit 64 can also send and receive data to and from an external device via the communication network 13.

  The information collecting unit 65 collects position information and power amount information transmitted from the communication terminal 11. Further, the information collecting unit 65 generates a battery remaining amount table and the like which will be described later. Each information obtained by the information collecting means 65 is stored in the storage means 63.

  The grouping unit 66 groups one or a plurality of communication terminals 11 based on the data collected by the information collecting unit 65. As a grouping method, for example, grouping may be performed according to the number of terminals so that one group is within a predetermined number, and based on a predetermined range (for example, a radius of m to several km from a certain point). Grouping may be performed.

  The predetermined range may be a fixed value or may be changed for each location. For example, the predetermined range is reduced in places where there are many people such as around a station or a building street, and conversely, the predetermined range is increased in places where there are few people such as rivers and vacant lots. Further, the location information described above can be easily obtained using, for example, map information. Map information is stored in the storage means 63.

  Furthermore, the grouping method is not limited to the above-described content, and for example, grouping may be performed by combining a predetermined number and a predetermined range. The grouping unit 66 performs grouping so that the communication terminals 11 that collect the position information and the power amount information are included in any of the grouped groups.

  The representative terminal selection unit 67 selects one or a plurality of communication terminals 11 that are representative terminals for each group grouped by the grouping unit 66. Here, the selection method is, for example, a terminal that consumes the least power in each group. Note that the selection method is not limited to this, and two or more communication terminals 11 may be selected based on, for example, power consumption or grouped location information.

  As a selection method, for example, the communication terminal that has transmitted position information and power amount information to the management server 12 earliest in the group may be used as the representative terminal. Thereby, rapid communication can be realized between the communication terminal 11 serving as the representative terminal and the management server 12.

  Further, the representative terminal selection unit 67 can perform a process of switching another communication terminal in the same group to the representative terminal according to the power consumption status of the representative terminal. In this case, the grouping means 66 may reset the group itself.

  The mail transmission / reception means 68 performs transmission / reception of mail with other communication terminals. Specifically, for example, when the safety confirmation information is a mail, the mail transmission / reception means 68 transmits the safety confirmation mail to the representative terminal. At this time, the mail transmission / reception means 68 can also transmit information (for example, address information) for performing short-range communication with the communication terminals in the group managed by the representative terminal.

  The tabulating unit 69 tabulates the safety result information of each communication terminal 11 obtained from the representative terminal 12 and manages the safety of each communication terminal 11. For example, if there is a communication terminal 11 for which a safety confirmation result cannot be obtained even after a predetermined time has elapsed since receiving position information and electric energy information, the counting unit 69 determines that there is an abnormality, and the administrator Notifications can be made to predetermined services such as the police and fire department. Further, the counting unit 69 is not limited to after the above-described time elapses. For example, even when there is a communication terminal 11 for which a safety confirmation result cannot be obtained after a predetermined time has elapsed after transmitting the safety confirmation information, The above-described processing may be performed by determining that there is. In addition, the totalization means 69 can notify also the positional information of the communication terminal 11 without safety result information, for example, when notifying a predetermined service that there is an abnormality.

  Further, the counting unit 69 retransmits the safety confirmation information using the mail transmitting / receiving unit 68 or the like when there is a communication terminal (an unanswered communication terminal) 11 that has not received a response within the predetermined time described above. Let it be done. Note that at the time of retransmission, a considerable amount of time may have elapsed since the collection of power amount information. For this reason, it is conceivable that the power amount information (for example, the remaining battery capacity) has changed from the information actually collected. Therefore, in the present embodiment, when transmitting the safety confirmation information, the power amount information already obtained by the representative terminal selection unit 67 is used to estimate the current power amount information of the representative terminal, and a new result is obtained from the estimation result. Re-select a representative terminal.

  The control unit 70 controls the entire configuration of the management server 12. Specifically, the control means 70 controls various processes such as communication control, information collection, grouping, representative terminal selection, mail transmission / reception, aggregation, and management.

<Management Server 12: Hardware Configuration Example>
FIG. 5 is a diagram illustrating an example of a hardware configuration in the management server. The management server 12 in FIG. 5 is configured to include an input device 81, an output device 82, a drive device 83, an auxiliary storage device 84, a memory 85, a CPU 86 that performs various controls, and a network connection device 87. These are connected to each other by a system bus B.

  The input device 81 has a pointing device such as a keyboard and a mouse operated by an administrator of the management server 12, for example, and inputs various operation signals such as execution of a program from the administrator. The output device 82 has a display for displaying various windows, data, and the like, and displays the execution progress and results of the control program executed by the CPU 86.

  Here, the various programs executed by the management server 12 are provided by a portable storage medium 88 such as a Universal Serial Bus (USB) memory or a CD-ROM, for example. The storage medium 88 can be set in the drive device 83, and an execution program included in the storage medium 88 is installed in the auxiliary storage device 84 from the storage medium 88 via the drive device 83.

  The auxiliary storage device 84 is a storage means such as a hard disk, and stores an execution program for safety confirmation processing, a control program provided in the computer, and the like, and performs input / output as necessary.

  The memory 85 stores an execution program read from the auxiliary storage device 84 by the CPU 86. Note that the memory 85 includes a ROM, a RAM, and the like. The memory 85 corresponds to the storage unit 63 described above, for example.

  The CPU 86 controls the overall processing of the computer, such as various operations and data input / output with each hardware component, based on a control program such as an OS and an execution program stored in the memory 85, thereby ensuring safety. Implement each process in the confirmation. Various information necessary during the execution of the program may be acquired from the auxiliary storage device 84 and the execution result or the like may be stored.

  The network connection device 87 obtains an execution program from another device or the like connected to the communication network by connecting to the communication network 13 or the like, or an execution result obtained by executing the program or the execution program itself To other devices. Further, the network connection device 87 realizes mail transmission / reception with the outside. The network connection device 87 corresponds to, for example, the communication unit 64 and the mail transmission / reception unit 68 described above.

  With the hardware configuration described above, the safety confirmation process in the management server 12 of this embodiment can be executed. Further, by installing the execution program, it is possible to easily realize the safety confirmation process in the management server 12 by a computer or the like.

<Summary example of safety confirmation processing>
FIG. 6 is a sequence diagram illustrating an example of the safety confirmation process. The sequence diagram shown in FIG. 6 includes two communication terminals 11-1a and 11-2a and a management server 12 as an example. In the example of FIG. 6, two communication terminals 11-1a and 11-2a are grouped in the same group described above, and an example in which the communication terminal 11-1a is selected as a representative terminal is shown. Yes.

  In the example of FIG. 6, when the two communication terminals 11-1a and 11-2a each receive emergency bulletin (for example, emergency information such as emergency earthquake bulletin) (S01, S02), position information and power at that time Quantity information is acquired (S03, S04). The communication terminal 11-1a transmits the acquired position information and power amount information to the management server 12 (S05), and the communication terminal 11-2a also transmits the acquired position information and power amount information to the management server 12. (S06). Note that the communication terminals 11-1a and 11-2a are set to the power save mode in order to suppress power consumption after transmitting the position information and the power amount information (S07, S08).

  The management server 12 receives the position information and power amount information transmitted from the communication terminals 11-1a and 11-2a, and stores each received information (S09). Next, the management server 12 groups the communication terminals 11 based on the stored position information (S10), and selects a representative terminal from the grouped communication terminals 11 (S11). Further, the management server 12 generates safety confirmation information to be transmitted to the selected representative terminal and information (surrounding terminal information) of other communication terminals belonging to the same group as the representative terminal (S12), Is transmitted to the representative terminal (communication terminal 11-1a in the example of FIG. 6) (S13).

  The communication terminal 11-1a acquires safety confirmation information and surrounding terminal information (S14). The communication terminal 11-1a recognizes that it is the representative terminal by receiving the safety confirmation information from the management server 11 instead of the representative terminal. In other words, the communication terminal 11-1a recognizes that it is the representative terminal by receiving the safety confirmation information not by the second communication means 25 but by the first communication means 24. Next, as a representative terminal, the communication terminal 11-1a transmits safety confirmation information by short-range communication to the acquired surrounding terminal information (S15).

  The communication terminal 11-2a receives the safety confirmation information from the communication terminal 11-1a which is the representative terminal, creates an answer to the received safety confirmation information (S16), and creates the created answer (safety result information), It transmits to a representative terminal (communication terminal 11-1a) (S17).

  The above-described safety confirmation information includes, for example, an e-mail, but is not limited thereto. For example, a short mail function may be used, and the safety confirmation may be performed using the web or the like. For example, the safety confirmation by the web or the like is performed by first transmitting address information such as Uniform Resource Locator (URL) in the mail body and allowing the communication terminal 11-2a to access the web page of the address. Next, the communication terminal 11-2a performs safety confirmation by inputting the safety result in the confirmation column of the safety confirmation information of the web page. In the process of S16, whether or not an answer to the safety confirmation information has been created by detecting the completion of the input by the communication terminal 11-2a when the user inputs data using an input means or the like. Judging.

  The communication terminal 11-1a acquires terminal information and answer information (safety confirmation result) from the surrounding terminal (communication terminal 11-2a) (S18), and sends the terminal information and answer information (safety confirmation result) to the management server 12. Transmit (S19). If the communication terminal 11-1a has not transmitted its own terminal information and answer information, the communication terminal 11-1a creates its own answer information and transmits the terminal information and the answer information together to the management server 12. . In the present embodiment, in the process of S19, when answer information is obtained from a plurality of communication terminals, the response information is collected and transmitted to the management server 12 in predetermined time units. Thereby, the transmission frequency from the communication terminal 11-1a to the management server 12 can be reduced and transmission efficiency can be improved.

  The management server 12 tabulates the safety confirmation results based on the terminal information and answer information obtained from the communication terminal 11-1a (S20). In the present embodiment, safety confirmation information is retransmitted to a communication terminal that is not obtained as a result of safety after the above-described processing. Here, at the time of retransmission or the like, a considerable amount of time may have elapsed since the collection of the power amount information, and the power amount information (for example, the remaining battery level) may have changed from the collected information. Conceivable. Therefore, at the time of retransmission, the remaining battery level is estimated from the existing collected data, and the representative terminal is reselected from the result.

  Next, an example of a safety confirmation processing procedure in the communication terminal 11 and the management server 12 will be specifically described using a flowchart and the like.

<Example of safety confirmation processing procedure in communication terminal 11>
FIG. 7 is a flowchart illustrating an example of a safety confirmation processing procedure in the communication terminal. In the safety confirmation process in the communication terminal 11 shown in FIG. 7, when an emergency early warning (for example, an emergency earthquake early warning) is received as described above (S31), a predetermined application is activated (S32). Information and the remaining battery level are measured (S33). In the process of S33, for example, time at full charge, current time information, and the like may be acquired. In the safety confirmation process in the communication terminal 11, the information measured in S33 is transmitted to the management server 12 (S34), and then the power save mode is set to save energy as necessary (S35). Note that the process of S35 may not be performed.

  Next, in the safety confirmation processing in the communication terminal 11, when safety confirmation information is received from the management server 12 (S36), it is determined whether or not the reception is reception by short-range communication (second communication means 25) ( S37). Thereby, it is possible to easily grasp whether the own communication terminal is communicating with the representative terminal or communicating with the management server 12 and the first communication means 24. Note that the process of S37 is not limited to this. For example, whether or not the communication terminal is the representative terminal can be determined based on whether or not the reception is performed by the first communication unit 24. .

  The safety confirmation process in the communication terminal 11 operates as a process of the representative terminal when the short-distance communication is not received (NO in S37). Specifically, the safety confirmation process in the communication terminal 11 notifies the safety confirmation information to surrounding terminals in the same group using the received group information and terminal information (S38). Further, the communication terminal as a representative terminal receives the responses of the surrounding terminals (S39), and collectively transmits its own safety information and the surrounding safety information to the management server 12 (S40).

  Here, the safety confirmation process in the communication terminal 11 determines whether or not the transmission is completed (S41). If the transmission is not completed (NO in S41), the process returns to S39. That is, since the timing at which responses from surrounding terminals are often different, the process of transmitting the safety result information to the management server 12 is periodically retried. If the transmission is complete (YES in S41), the process ends.

  Moreover, the safety confirmation process in the communication terminal 11 operates as a peripheral terminal when the short-distance communication is received in the process of S37 (YES in S37). Specifically, the safety confirmation process in the communication terminal 11 creates its own response to the safety confirmation information from the representative terminal and transmits it to the representative terminal (S42). Further, the safety confirmation process in the communication terminal 11 determines whether or not the transmission is completed (S43). If the transmission is not completed (NO in S43), the process returns to S42. That is, the safety confirmation process in the communication terminal 11 stands by until an answer is transmitted to the representative terminal as a surrounding terminal. If the surrounding terminal has completed transmission (YES in S43), the process ends.

<Example of safety confirmation processing procedure in management server 12>
FIG. 8 is a flowchart illustrating an example of a safety confirmation processing procedure in the management server. In the safety confirmation process in the management server 12 shown in FIG. 8, as described above, GPS position information and battery remaining amount information are collected from each communication terminal (S51), and a battery remaining amount table over time is created (S52). . This battery remaining amount table is used at the time of selecting a representative terminal (including the time of reselection at the time of retransmission of safety confirmation information). The battery remaining amount table will be described later.

  Next, in the safety confirmation process in the management server 12, the communication terminals 11 are grouped from the acquired GPS position information (S53), and the current representative terminal is selected (S54). In the process of S53, the GPS position information can be used to group by a communicable distance defined by, for example, short-range communication, but the present invention is not limited to this. Also good. In the process of S54, for example, the communication terminal with the largest remaining battery level (including estimated information) at the time of transmission (including first time and retransmission) can be set as the representative terminal, but is not limited to this. is not.

  The safety confirmation process in the management server 12 transmits safety confirmation information to the representative terminal (S55). At this time, the contents to be transmitted include, for example, group information and surrounding terminal information, but are not limited thereto. The safety confirmation process in the management server 12 determines whether or not the process has been normally completed (S56). If the process has not been completed normally (NO in S56), the process returns to S54. In this process, in consideration of communication congestion, when transmission to the representative terminal fails, the representative terminal is reselected and retransmitted. Further, when the safety confirmation process in the management server 12 is normally completed (YES in S56), the safety result information is received and the received safety results are totaled (S57).

  Here, it is determined whether or not there is an unanswered communication terminal 11 among the communication terminals 11 collected in S51 (S58). If there is an unanswered communication terminal 11 (NO in S58), the process proceeds to S53. Return to processing. That is, when there is an unanswered communication terminal 11, regrouping is performed in the unanswered communication terminal 11, and a representative terminal is reselected from the regrouped communication terminals in the same group and retransmitted. To do. In the present embodiment, a representative terminal may be reselected from unanswered communication terminals 11 in a group that has already been grouped without performing the above-described regrouping. Thereby, the reply from the communication terminal 11 which has not been answered efficiently can be acquired.

<Example of grouping>
Next, an example of grouping by the grouping unit 66 will be specifically described. FIG. 9 is a diagram illustrating an example of grouping. In the example of FIG. 9, communication terminals 90-1 to 90-14 are provided. The grouping means 66 can group the communication terminals 11 so as to fall within a predetermined area, for example, with a distance that can be communicated by short-range communication as a diameter, but is not limited thereto.

  Here, for example, the communication terminal 90-8 at the point C can be grouped into groups 91-1 or 91-2. Thus, when straddling a plurality of groups, for example, it is assigned to any group based on the representative terminals of the group 91-1 and the group 91-2.

  Specifically, for example, it is assumed that the communication terminal 90-3 at the point A is a representative terminal and the terminal has the maximum remaining battery charge of the group 91-1. In addition, it is assumed that the communication terminal 90-11 at the point B is a representative terminal and the terminal has the maximum remaining battery charge of the group 91-2. At this time, when the remaining battery level of the communication terminal 90-3 is larger than the remaining battery level of the communication terminal 90-11, the grouping means 66 groups the communication terminal 90-8 into the group 91-1.

<Selection method of proxy terminal>
Next, a method for selecting a proxy terminal will be described with reference to the drawings. FIG. 10 is a diagram illustrating an example of battery information for selecting a proxy terminal. FIG. 11 is a diagram showing an example of representative terminal selection at the time of retransmission. 10A shows an example of the first battery information, and FIG. 10B shows an example of the second battery information. 10A and 10B correspond to the battery remaining amount table with the passage of time in S52 described above.

  In FIG. 10A, the remaining amount (%) of each battery is shown as an item at the time of earthquake early warning, 5 minutes, 30 minutes, 1 hour, 1 hour and a half. In the example of FIG. 10 (A), the elapsed time from when the battery is fully charged (battery remaining amount 100%) is shown. In the example of FIG. 10 (A), the elapsed time is indicated as 2 hours ago, but is not limited to this, and the date and time information at the time of full charge (for example, 18:00 on March 22, 2012) 00 minutes). By acquiring time information at the time of full charge, it is possible to grasp how much the battery has consumed with respect to the elapsed time from the full charge time to the earthquake early warning.

  For example, in the example of FIG. 10 (A), if the remaining battery level is reduced by 10% at the time of earthquake early warning (current) after 2 hours (120 minutes) has elapsed since full charge, 2.5% after 30 minutes. It can be estimated that it decreases and decreases by 5% after 1 hour. In this way, the remaining battery level such as 30 minutes later, 1 hour later, 1 hour and a half later can be estimated from the remaining battery level at the time of full charge and at the time of the earthquake warning. Note that the estimated time is not limited to 30 minutes, 1 hour, 1 hour and a half, and may be another time.

  Further, as shown in FIG. 10B, when there is no time information at the time of full charge, for example, when the earthquake warning is received at the communication terminal 11, a predetermined time interval (for example, every 5 minutes) By transmitting the position information and the power amount information (remaining battery amount) to the management server 12 at least twice, it is possible to estimate the remaining battery amount over time. For example, the remaining battery level at the time of reselecting the representative terminal (current time) is: “Battery remaining amount at the time of breaking news − ((current time−breaking time) / predetermined time (for example, 5 minutes)) × (battery at the time of breaking news” Remaining amount-battery remaining amount after 5 minutes) ", but is not limited to this.

  Thereby, when the safety confirmation information is retransmitted to the unanswered communication terminal, the representative terminal is selected by the process as shown in FIG. In the example of FIG. 11, the communication terminal 1 and the communication terminal 2 are included in the same group. Here, when comparing the remaining battery levels, the communication terminal 2 becomes the representative terminal because the remaining battery level of the communication terminal 1 is 20% and the remaining battery level of the communication terminal 2 is 30% at the first transmission.

  For example, at the first retransmission performed 30 minutes after the initial transmission, the representative terminal is reselected based on the remaining battery level estimated based on the remaining battery level table shown in FIG. Specifically, as illustrated in FIG. 11, the communication terminal 2 is the representative terminal because the communication terminal 1 has a remaining battery level of 18% and the communication terminal 2 has a remaining battery level of 20%. Furthermore, for example, in the second retransmission performed one hour after the initial transmission, the battery level of the communication terminal 1 is 16% and the battery level of the communication terminal 2 is 10% from the estimated battery level. The communication terminal 1 becomes a representative terminal. As described above, in the present embodiment, at a time (transmission timing) at which safety confirmation is transmitted (re-transmission or the like) every time, an appropriate communication terminal is selected as a representative terminal based on the estimated remaining battery level, and safety confirmation processing is performed. it can. In this embodiment, after a predetermined time, by regrouping unanswered communication terminals, estimating the remaining amount from the battery information, selecting a representative terminal, and retransmitting safety confirmation information (for example, safety mail), The safety of the communication terminal can be confirmed with higher accuracy.

<Example of safety confirmation information>
Next, an example of the safety confirmation information described above will be described. As an example of the safety confirmation information, for example, there is a mail message transmitted by the management server 12. Specifically, “This message has been sent from the management server 12 (for example, an emergency contact system). An earthquake with a seismic intensity of 5 or more occurred in **. Please reply by replying to this message "," 1: Safe "," 2: Minor injury "," 3: Serious injury "," 4: Ask for help "," 5: Other ", etc. One of the preset selection items can be selected. In the present embodiment, the present invention is not limited to this. Information for notifying the situation by directly inputting characters may be created.

<Example of surrounding terminal information>
Next, an example of the surrounding terminal information described above will be described with reference to the drawings. FIG. 12 is a diagram illustrating an example of surrounding terminal information.

  In the example of FIG. 12, the items include “physical address” and “communication method”, but are not limited thereto. The physical address is a unique value for identifying the communication terminal, and “xx-xx-xx-xx-xx-xx” illustrated in FIG. 12 is set with a different numerical value, character, or the like for each communication terminal. . Moreover, in this embodiment, when communicating by the 2nd communication means 25, it can communicate using a 1 or several communication system. Therefore, in the present embodiment, a communication method capable of short-range communication with the communication terminal is set corresponding to the physical address of the surrounding terminal.

  Therefore, the representative terminal performs communication using short-range communication that can communicate with each peripheral terminal by the second communication method based on the peripheral terminal information.

  In the example of FIG. 12, for example, “Bluetooth (registered trademark) *. *”, “Other short-range communication 1 can be used”, “other short-range communication 2”, etc. are used to confirm safety. However, the present invention is not limited to this. In addition, the short-range communication 1 and the short-range communication 2 can be used in, for example, a wireless local area network (LAN).

  As described above, according to the present embodiment, safety confirmation at the time of a disaster or the like can be performed efficiently. Specifically, for example, there is a time lag from the occurrence of an earthquake until communication restrictions are made, but in this embodiment, the emergency remaining information is used as a trigger to reliably collect the remaining battery level and location information of the communication terminal. can do. Thereby, it becomes possible to carry out the subsequent safety confirmation work efficiently.

  Moreover, according to this embodiment, the battery consumption of a communication terminal can be reduced. Specifically, in the present embodiment, for example, by representing a terminal having a large remaining battery capacity, it is possible to avoid the situation where distribution / response is not possible due to battery exhaustion and to reliably distribute information to each group. Conversely, a communication terminal with a small remaining battery capacity can reduce a useless communication such as a retransmission of an answer due to communication restrictions, thereby allowing the battery to last longer and increasing the number of answer opportunities after the communication is restored.

  Furthermore, according to this embodiment, the load on the management server 12 and the infrastructure can be reduced. Specifically, for example, the number of communication terminals responsible for communication with the management server 12 is reduced to a small number, and the load on the management server 12 and the load on the infrastructure can be reduced.

  Each embodiment has been described in detail above, but is not limited to a specific embodiment, and various modifications and changes can be made within the scope described in the claims.

In addition, the following additional remarks are disclosed regarding the above Example.
(Appendix 1)
In a communication system including a plurality of communication terminals and a management server capable of communicating with the plurality of communication terminals,
The communication terminal is
Position information acquisition means for acquiring position information of the communication terminal when receiving emergency information, information notification means for notifying the management server of position information acquired by the position information acquisition means, and power amount information; ,
Control means for controlling to transmit an answer to the safety confirmation information as a representative terminal or a peripheral terminal in a predetermined group based on the communication means when the safety confirmation information corresponding to the emergency information is received from the management server And
The management server
Information collecting means for collecting position information and electric energy information from the communication terminal;
Grouping means for grouping one or a plurality of communication terminals based on the position information obtained by the information collecting means;
Representative terminal selection means for selecting a representative terminal based on the power amount information from among communication terminals in the same group obtained by the grouping means;
The safety confirmation information and surrounding terminal information including communication terminal information within the same group are transmitted to the representative terminal, and safety result information between the representative terminal and the surrounding terminals is received from the representative terminal. A communication system comprising a transmission / reception means.
(Appendix 2)
The control means includes
The communication system according to supplementary note 1, wherein when the communication means is short-range communication, a response to the safety confirmation information is transmitted to the representative terminal as the surrounding terminal.
(Appendix 3)
The control means includes
When the communication means is not short-range communication, the safety confirmation information is transmitted to the surrounding terminals in the predetermined group as the representative terminal, and an answer to the safety confirmation information obtained from the surrounding terminals is sent at a predetermined timing. The communication system according to appendix 1 or 2, wherein the transmission is performed collectively.
(Appendix 4)
The communication terminal is
The communication system according to any one of appendices 1 to 3, further comprising: an energy saving setting unit that switches the setting to a power saving mode after notifying the management server of the position information and the electric energy information.
(Appendix 5)
The grouping means includes
In a communication terminal that has not received the safety result information within a predetermined time, regrouping is performed,
The representative terminal selecting means is:
5. The communication system according to any one of appendices 1 to 4, wherein a representative terminal is reselected from among the regrouped communication terminals in the same group.
(Appendix 6)
The representative terminal selecting means is:
When re-selecting the representative terminal, the current power amount of the communication terminal is estimated based on the power amount information when the emergency information is received, and the representative terminal is re-established based on the estimated power amount information. The communication system according to appendix 5, wherein the communication system is selected.
(Appendix 7)
The grouping means includes
Any one of Supplementary notes 1 to 6, wherein when the communication terminal is within a range of a plurality of groups, the representative terminals of each group are grouped into a representative terminal group having a large amount of power information. The communication system according to item.
(Appendix 8)
When a communication terminal receives emergency information, it acquires the position information of the communication terminal, notifies the management server of the acquired position information and power amount information,
The management server acquires position information and power amount information from the communication terminal, groups one or more communication terminals based on the acquired position information, and sets the power amount information from among communication terminals in the same group. The representative terminal is selected on the basis of the safety confirmation information and the surrounding terminal information including the communication terminal information in the same group to the representative terminal,
Based on the communication means when the communication terminal receives the safety confirmation information corresponding to the emergency information obtained from the management server, as a representative terminal or a surrounding terminal in a predetermined group, the reply to the safety confirmation information is To the management server,
A safety confirmation method comprising: a process in which the management server receives safety result information between the representative terminal and the surrounding terminals from the representative terminal.
(Appendix 9)
Position information acquisition means for acquiring position information of the communication terminal when the communication terminal receives emergency information;
Information notifying means for notifying the management server of the position information acquired by the position information acquiring means and the electric energy information;
Control means for controlling to transmit an answer to the safety confirmation information as a representative terminal or a peripheral terminal in a predetermined group based on the communication means when the safety confirmation information corresponding to the emergency information is received. A communication terminal characterized by.

DESCRIPTION OF SYMBOLS 10 Communication system 11,90 Communication terminal 12 Management server 13 Communication network 14 Base station 21,61 Input means 22,62 Output means 23,63 Storage means 24 1st communication means 25 2nd communication means 26 Power acquisition means 27 Application starting means 27 28 Information Notifying Unit 30 Energy Saving Setting Unit 31 Mail Transmission / Reception Unit 31 Screen Generation Unit 32, 70 Control Unit 41 Microphone 42 Speaker 43 Display 44 Radio Unit 45 Operation Unit 46 Location Information Acquisition Unit 47 Short Distance Communication Unit 48 Power Unit 49 Power Detection Unit 50, 85 Memory 51, 86 Central Processing Unit (CPU)
64 Communication means 65 Information collection means 66 Grouping means 67 Representative terminal selection means 68 Mail transmission / reception means 69 Aggregation means 81 Input device 82 Output device 83 Drive device 84 Auxiliary storage device 87 Network connection device 88 Storage means 91 Group

Claims (7)

In a communication system including a plurality of communication terminals and a management server capable of communicating with the plurality of communication terminals,
The communication terminal is
Position information acquisition means for acquiring position information of the communication terminal when receiving emergency information, information notification means for notifying the management server of position information acquired by the position information acquisition means, and power amount information; ,
Control means for controlling to transmit an answer to the safety confirmation information as a representative terminal or a peripheral terminal in a predetermined group based on the communication means when the safety confirmation information corresponding to the emergency information is received from the management server And
The management server
Information collecting means for collecting position information and electric energy information from the communication terminal;
Grouping means for grouping one or a plurality of communication terminals based on the position information obtained by the information collecting means;
Representative terminal selection means for selecting a representative terminal based on the power amount information from among communication terminals in the same group obtained by the grouping means;
The safety confirmation information and surrounding terminal information including communication terminal information within the same group are transmitted to the representative terminal, and safety result information between the representative terminal and the surrounding terminals is received from the representative terminal. A communication system comprising a transmission / reception means. The control means includes
2. The communication system according to claim 1, wherein when the communication unit is short-range communication, a response to the safety confirmation information is transmitted to the representative terminal as the surrounding terminal. The control means includes
When the communication means is not short-range communication, the safety confirmation information is transmitted to the surrounding terminals in the predetermined group as the representative terminal, and an answer to the safety confirmation information obtained from the surrounding terminals is sent at a predetermined timing. The communication system according to claim 1, wherein the communication is transmitted collectively. The communication terminal is
The communication system according to any one of claims 1 to 3, further comprising an energy saving setting unit that switches the setting to a power saving mode after notifying the management server of the position information and the electric energy information. The grouping means includes
In a communication terminal that has not received the safety result information within a predetermined time, regrouping is performed,
The representative terminal selecting means is:
5. The communication system according to claim 1, wherein a representative terminal is reselected from among the regrouped communication terminals in the same group. When a communication terminal receives emergency information, it acquires the position information of the communication terminal, notifies the management server of the acquired position information and power amount information,
The management server acquires position information and power amount information from the communication terminal, groups one or more communication terminals based on the acquired position information, and sets the power amount information from among communication terminals in the same group. The representative terminal is selected on the basis of the safety confirmation information and the surrounding terminal information including the communication terminal information in the same group to the representative terminal,
Based on the communication means when the communication terminal receives the safety confirmation information corresponding to the emergency information obtained from the management server, as a representative terminal or a surrounding terminal in a predetermined group, the reply to the safety confirmation information is To the management server,
A safety confirmation method comprising: a process in which the management server receives safety result information between the representative terminal and the surrounding terminals from the representative terminal. Position information acquisition means for acquiring position information of the communication terminal when the communication terminal receives emergency information;
Information notifying means for notifying the management server of the position information acquired by the position information acquiring means and the electric energy information;
Control means for controlling to transmit an answer to the safety confirmation information as a representative terminal or a peripheral terminal in a predetermined group based on the communication means when the safety confirmation information corresponding to the emergency information is received. A communication terminal characterized by.

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