JP6271305B2 - Disaster communication system and disaster communication method - Google Patents

Description

  The present invention relates to communication when a disaster occurs.

  For earthquakes, tsunamis, tornadoes, and other disasters, especially when large-scale disasters occur, for the purpose of confirming safety, reporting the status of disasters, requesting rescue, etc. The amount of communication increased. This causes network congestion, and for example, highly urgent communication from a disaster occurrence area may be delayed or disabled. Technologies relating to network control when a disaster occurs are disclosed in Patent Documents 1 and 2, for example. In Patent Document 1, in order to quickly transmit / receive disaster damage status information between a disaster monitor and a disaster victim in a disaster occurrence area, a packet call bandwidth is given priority over other call bandwidths in accordance with an operator instruction. Is disclosed. In Patent Document 2, when a base station performs data transfer based on an application, a communication control start threshold value is specified from the priority added to data to be transferred, and the current line specification rate is the start threshold value. It discloses that data transfer is performed if the value is below the value, and discarding is performed without data transfer if the start threshold value is exceeded.

International Publication No. 2005/004076 JP 2011-205721 A

Desirable network control at the time of the occurrence of a disaster is considered to vary depending on the state of occurrence of the disaster (for example, the type and scale of the disaster that occurred, the area where the disaster occurred). In addition, when a disaster occurs, it is desirable to be able to quickly shift to network control at the time of the disaster. However, with the technique described in Patent Document 1, it is difficult to realize accurate and quick network control because the operator needs to activate the disaster system control. In the technique described in Patent Document 2, if the line usage rate exceeds a certain value, there is a possibility that transmission / reception of information related to a disaster becomes impossible at all.
Therefore, an object of the present invention is to provide a technology for autonomously performing priority communication of information related to disasters.

In order to solve the above-described problem, a disaster communication system of the present invention includes a mobile station device, a base station device that communicates with the mobile station device using a frequency band selected from usable communication bands, and the base A base station device that communicates with a station device, and the base station device includes a bandwidth control unit that variably controls a bandwidth of a priority bandwidth that prioritizes communication of disaster-related information in the communication bandwidth, and is included in the priority bandwidth A communication control unit that performs priority communication of disaster-related information using the frequency band, the mobile station device is disaster-related information indicating a shooting unit and a disaster occurrence status or a rescue request, The occurrence position and movement direction of the event related to the disaster are identified based on the position in the captured image of the event captured by the imaging unit, the direction of the imaging, and the position of the mobile station device at the time of the imaging. The occurrence position and the moving direction and a transmission processing unit for transmitting the disaster-related information including the vector data vectorization to the base station apparatus, the server apparatus, from the mobile station device via the base station apparatus It has a process execution part which performs a predetermined process based on the received disaster related information.

The disaster communication system of the present invention includes a mobile station apparatus, a base station apparatus that communicates with the mobile station apparatus using a frequency band selected from usable communication bands, and a server that communicates with the base station apparatus. The base station apparatus uses a bandwidth control unit that variably controls a bandwidth of a priority band that prioritizes communication of disaster-related information in the communication band, and the frequency band included in the priority band. A communication control unit that performs priority communication of the disaster related information, and the mobile station device includes a transmission processing unit that transmits the location information of the own device to the base station device as the disaster related information, The server device generates evacuation instruction data for issuing an evacuation instruction based on the location information of the mobile station device received as the disaster-related information from the mobile station device via the base station device. The communication control unit transmits the evacuation instruction data generated by the process execution unit to the mobile station device, and the mobile station device receives the received from the base station device. A first evacuation control unit that issues an evacuation instruction to a user based on evacuation instruction data, and the base station device receives the disaster-related information from the mobile station device when communication with the server device is impossible; A second evacuation control unit configured to generate the evacuation instruction data based on the received location information of the mobile station device, and the communication control unit is configured to perform communication with the server device when the communication with the server device is impossible. 2 When the evacuation instruction data generated by the evacuation control unit is transmitted to the mobile station device, and the first evacuation control unit cannot communicate with the base station device, Between the evacuation fingers To send and receive data.
In the disaster communication system of the present invention, the bandwidth control unit, the distance between the disaster occurrence place and the base station device, the elapsed time since the disaster occurred, the temporal change in the amount of disaster-related information received in the base station device, The variable control may be performed based on one or more of the altitudes in the communication area of the base station device.

  In the disaster communication system of the present invention, the transmission processing unit may transmit disaster-related information indicating a disaster occurrence state or a rescue request.

In the disaster communication system of the present invention, the disaster-related information indicating the occurrence status may include vector data obtained by vectorizing an occurrence position and a moving direction of the event related to the disaster.
In this disaster communication system, the disaster-related information indicating the occurrence status includes the vector data and video data indicating a captured image of the event, and the transmission processing unit The process execution unit generates evacuation instruction data as disaster related information based on the vector data and transmits the evacuation instruction data to the base station device, and the communication control unit The evacuation instruction data may be transmitted to the mobile station apparatus, and the mobile station apparatus may include a first evacuation control unit that issues an evacuation instruction to a user based on the evacuation instruction data received from the base station apparatus. Good.

In the disaster communication system of the present invention, the transmission processing unit may transmit position information of the device itself, and the process execution unit may generate the evacuation instruction data based on the received position information.
In this disaster communication system, the transmission processing unit may increase the transmission frequency of the location information as the own apparatus and the disaster occurrence place are closer .

The disaster communication method of the present invention includes a mobile station device having an imaging unit, a base station device that communicates with the mobile station device using a frequency band selected from usable communication bands, and a communication with the base station device. A disaster communication method realized by the server device, wherein the base station device variably controls a bandwidth of a priority bandwidth that prioritizes communication of disaster-related information in the communication band, and the priority A communication control step for performing priority communication of disaster-related information using the frequency band included in the band, and a shooting step in which the mobile station apparatus captures images by the imaging unit, and a disaster occurrence state or rescue The disaster-related information indicating the request, the occurrence position and movement direction of the event related to the disaster, the position in the captured image of the event captured in the imaging step, the direction of the imaging And a transmission processing step for transmitting to the base station apparatus disaster-related information that is specified based on the position of the mobile station apparatus at the time of shooting and includes vector data obtained by vectorizing the specified occurrence position and moving direction. The server apparatus has a process execution step of executing a predetermined process based on disaster-related information received from the mobile station apparatus via the base station apparatus .

The disaster communication method of the present invention includes a mobile station device, a base station device that communicates with the mobile station device using a frequency band selected from usable communication bands, and a server device that communicates with the base station device. A disaster communication method realized in the above, wherein the base station apparatus variably controls a bandwidth of a priority bandwidth that prioritizes communication of disaster-related information in the communication bandwidth, and is included in the priority bandwidth A communication control step for performing priority communication of the disaster-related information using the frequency band, and the mobile station apparatus transmits the position information of the own apparatus as the disaster-related information to the base station apparatus And the server device issues an evacuation instruction based on the location information of the mobile station device received as the disaster-related information from the mobile station device via the base station device. And a base station apparatus that transmits the evacuation instruction data generated in the process execution step to the mobile station apparatus in the communication control step. And the mobile station device has a first evacuation control step for giving an evacuation instruction to a user based on the evacuation instruction data received from the base station device, and the base station device communicates with the server device. A second evacuation control step for generating the evacuation instruction data based on the location information of the mobile station device received as the disaster-related information from the mobile station device when it is impossible, In the communication control step, when communication with the server device is impossible, the evacuation generated in the second evacuation control step is performed. When the instruction data is transmitted to the mobile station apparatus and the mobile station apparatus cannot communicate with the base station apparatus in the first evacuation control step, the mobile station apparatus communicates with the other mobile station apparatus. The evacuation instruction data is transmitted / received .

  ADVANTAGE OF THE INVENTION According to this invention, the technique which autonomously performs the priority communication of the information regarding a disaster can be provided.

1 is a block diagram showing the overall configuration of a communication system according to an embodiment of the present invention. The block diagram which shows the hardware constitutions of the mobile station which concerns on the same embodiment. The block diagram which shows the hardware constitutions of the base station which concerns on the same embodiment. The block diagram which shows the structure of the disaster management server which concerns on the same embodiment. The block diagram which shows the function structure of the mobile station which concerns on the same embodiment, and a base station. Explanatory drawing of the communication band which the base station which concerns on the same embodiment can use. The sequence diagram which shows the flow of the process performed at the time of disaster occurrence with the communication system which concerns on the embodiment. The figure which shows the structural example of the disaster alerting signal in the same embodiment. The figure which shows the example of a display of the evacuation map at the time of the disaster occurrence in the embodiment. The flowchart which shows the flow of the 1st zone | band control process in the embodiment. The flowchart which shows the flow of the 1st correction process in the embodiment. Explanatory drawing of the example of a setting of the priority zone | band of the 1st zone | band control process in the embodiment. Explanatory drawing of the variable control of the priority zone | band of the 1st correction process in the embodiment. The sequence diagram which shows the flow of the process performed at the time of disaster data generation | occurrence | production by the communication system which concerns on the embodiment. The flowchart which shows the flow of the disaster data generation process in the embodiment. Explanatory drawing of the screen transition in the disaster data generation process in the embodiment. The figure which shows the structural example of the disaster data which shows the outbreak situation of the disaster which concerns on the embodiment. The figure which shows the example of a display of the evacuation map according to the disaster data in the embodiment. The flowchart which shows the flow of the 2nd zone | band control process in the embodiment. The flowchart which shows the flow of the 2nd correction process in the embodiment. Explanatory drawing of the variable control of the priority zone | band of the 2nd correction process in the embodiment. The sequence diagram which shows the flow of the process performed when communication via a core network becomes impossible with the communication system which concerns on the embodiment. The sequence diagram which shows the flow of the process performed when communication via a core network is attained by the communication system which concerns on the embodiment. The flowchart which shows the flow of the other base station influence prediction process in the embodiment. The sequence diagram which shows the flow of the process performed when communication of a base station becomes impossible with the communication system which concerns on the embodiment. The sequence diagram which shows the flow of the process performed at the time of disaster data generation | occurrence | production in the communication system which concerns on the modification of this invention.

Hereinafter, an embodiment of a disaster communication system of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing an overall configuration of a communication system 1 according to the present embodiment. The communication system 1 includes a plurality of mobile stations 10, a plurality of base stations 20, and a disaster management server 30. FIG. 1 shows base stations 20A, 20B, and 20C among a plurality of base stations 20. Further, FIG. 1 shows a “mobile station 10A” as the mobile station 10 in the communication area (cell) Cel-A that can be connected to the base station 20A. Further, FIG. 1 shows “mobile station 10B” as the mobile station 10 in the communication area Cel-B connectable to the base station 20B, and in the communication area Cel-C connectable to the base station 20C. As a certain mobile station 10, “mobile station 10C” is shown.

Each of the base station 20 and the disaster management server 30 is connected to the core network 100 corresponding to the network (communication network) of the present invention. The base station 20 is a wide area base station corresponding to the base station apparatus of the present invention. The mobile station 10 corresponds to the mobile station device of the present invention, and is a smartphone used by a user in the present embodiment.
The disaster management server 30 is a server device that collects disaster-related information related to a disaster from the mobile station 10 or provides it to the mobile station 10 by communicating with the mobile station 10 via the base station 20. . The disaster related information corresponds to information transmitted and received between the mobile station 10 and the disaster management server 30 in the present embodiment. The disaster management server 30 generates, for example, evacuation instruction data for issuing an evacuation instruction to the user of the mobile station 10 and transmits the evacuation instruction data to the mobile station 10. In this embodiment, the evacuation instruction data is data indicating an evacuation map for guiding the user of the mobile station 10 to the evacuation site.

FIG. 2 is a block diagram illustrating a hardware configuration of the mobile station 10. As shown in FIG. 2, the mobile station 10 includes a control unit 11, an operation unit 12, a display unit 13, a photographing unit 14, a storage unit 15, a sensor unit 16, a wireless communication unit 17, and a short distance. A communication unit 18 and a battery unit 19 are provided.
The control unit 11 is, for example, a microcomputer having a CPU (Central Processing Unit) 111 as a processor, a ROM (Read Only Memory) 112, and a RAM (Random Access Memory) 113. The CPU 111 controls each unit of the mobile station 10 by reading the program stored in the ROM 112 or the storage unit 15 into the RAM 113 and executing it.

  The operation unit 12 is, for example, an operation device that includes a touch screen and a physical key that are provided on the display surface of the display unit 13 and receives an operation performed by a user. The display unit 13 includes a liquid crystal display, for example, and is a display device that displays an image (screen) on a display surface. The imaging unit 14 includes an imaging element such as a CCD (Charge Coupled Device), and shoots to generate video data indicating a captured image (still image or moving image). The storage unit 15 is, for example, an EEPROM (Electronically Erasable and Programmable ROM) or a flash memory, and is a storage device that stores various data. The storage unit 15 stores the disaster application program AP installed in the mobile station 10. The disaster application program AP is executed to generate, for example, data indicating a disaster occurrence state or a rescue request (hereinafter referred to as “disaster data”).

  The sensor unit 16 includes various sensors including a positioning sensor and an orientation sensor. The positioning sensor is a GPS (Global Positioning System) sensor here, and performs a positioning process for obtaining position information of the mobile station 10 (more specifically, latitude and longitude of the current position). The azimuth sensor detects the direction (azimuth) that the mobile station 10 faces, for example, the azimuth taken by the photographing unit 14.

  The wireless communication unit 17 includes, for example, a wireless communication circuit and an antenna, and performs communication via the core network 100 by connecting to the base station 20. The short-range communication unit 18 includes, for example, a communication circuit and an antenna, and performs short-range wireless communication (direct communication) by connecting to another mobile station 10 without going through the core network 100. In other words, the short-range communication unit 18 performs communication via an ad hoc network, and performs wireless communication based on IEEE802.11x or Bluetooth (registered trademark) as an example. The battery unit 19 supplies a power source potential to each unit of the mobile station 10 from a battery as a power source, and measures the remaining battery level.

FIG. 3 is a block diagram illustrating a hardware configuration of the base station 20. As illustrated in FIG. 3, the base station 20 includes a control unit 21, a mobile station communication unit 22, a network communication unit 23, and a storage unit 24.
The control unit 21 is, for example, a microcomputer having a CPU 211 as a processor, a ROM 212, and a RAM 213. The CPU 211 controls each unit of the base station 20 by reading the program stored in the ROM 212 or the storage unit 24 into the RAM 213 and executing it. The mobile station communication unit 22 includes, for example, a communication circuit and an antenna, and communicates with the mobile station 10 in the communication area of the base station 20. The control unit 21 allocates a frequency band selected from the communication bands that can be used by the base station 20 to the mobile station 10, and performs wireless communication via the mobile station communication unit 22 using the allocated frequency band. The network communication unit 23 includes, for example, a communication circuit and an antenna, and performs communication with the core network 100. The storage unit 24 includes a nonvolatile memory (for example, a hard disk), and stores various data including a control program for operating the base station 20.

FIG. 4 is a block diagram showing the configuration of the disaster management server 30. As shown in FIG. As illustrated in FIG. 4, the disaster management server 30 includes a control unit 31, a network communication unit 32, a notification signal reception unit 33, and a storage unit 34.
The control unit 31 is, for example, a microcomputer including an arithmetic processing device including a CPU and a main memory including a ROM and a RAM. The control unit 31 corresponds to a process execution unit of the present invention. The arithmetic processing device controls each unit of the disaster management server 30 by reading out and executing the control program stored in the ROM or the storage unit 34 on the RAM. The network communication unit 32 includes a communication circuit, for example, and communicates with the base station 20 via the core network 100. The notification signal receiving unit 33 includes, for example, a communication circuit, and receives a disaster notification signal that notifies the occurrence of a disaster from the disaster notification device 40. The storage unit 34 includes a non-volatile memory (for example, a hard disk device), and stores a control program and the like for operating the disaster management server 30.

FIG. 5 is a block diagram illustrating functional configurations of the mobile station 10 and the base station 20. The control unit 21 of the base station 20 implements functions corresponding to the bandwidth control unit 201, the communication control unit 202, and the evacuation control unit 203 by executing a control program.
The bandwidth control unit 201 controls bandwidth of a communication bandwidth that can be used by the base station 20. For example, when a disaster occurs, the bandwidth control unit 201 sets a priority bandwidth that prioritizes communication of disaster-related information in the communication bandwidth. The bandwidth control unit 201 further variably controls the bandwidth of the priority bandwidth. The bandwidth control unit 201 performs variable control of the priority bandwidth based on the following conditions (a) to (d).
(A) Distance between the place where the disaster occurred and the base station 20 (b) Elevation in the communication area of the base station 20 (c) Elapsed time since the disaster occurred (d) Temporal amount of disaster data received at the base station 20 change

FIG. 6 is a diagram for explaining a communication band that can be used by the base station 20.
As shown in FIG. 6A, the band control unit 201 does not set a priority band in the communication band during normal times (that is, when no disaster occurs). As shown in FIG. 6B, when a disaster occurs, the bandwidth control unit 201 sets a priority bandwidth in the communication bandwidth. In the following description, the bandwidth of the priority band is expressed as a percentage value indicating a ratio of the communication band.
Note that the communication using the communication band includes, for example, voice call communication or data communication other than disaster related information, in addition to disaster related information communication.

  Returning to FIG. 5, the communication control unit 202 controls the communication performed by the base station 20. Specifically, the communication control unit 202 communicates with the mobile station 10 via the mobile station communication unit 22 and communicates with the disaster management server 30 via the network communication unit 23. The communication control unit 202 performs priority communication of disaster related information in communication using the priority band. As a specific example of priority communication, the communication control unit 202 changes the transmission order so that the transmission order of disaster-related information precedes other data that is not disaster-related information. The priority communication of disaster-related information is not limited to this example, and may be realized by a process that completes communication faster than the case where the priority communication is not performed.

  The evacuation control unit 203 (second evacuation control unit) administers control for instructing the user of the mobile station 10 to evacuate when a disaster occurs and communication with the core network 100 becomes impossible. Specifically, the evacuation control unit 203 generates an evacuation map instead of the disaster management server 30.

The control unit 11 of the mobile station 10 realizes functions corresponding to the disaster data generation unit 101, the communication control unit 102, and the evacuation control unit 103 by executing the disaster application program AP.
The disaster data generation unit 101 generates disaster data by executing disaster data generation processing. A detailed algorithm of the disaster data generation process will be described later.
The communication control unit 102 manages control related to communication performed by the mobile station 10. The communication control unit 102 communicates with the base station 20 via the wireless communication unit 17. The communication control unit 102 transmits the disaster data generated by the disaster data generation unit 101 to the base station 20 using, for example, a communication band that can be used by the base station 20 (transmission processing unit). Further, the communication control unit 102 communicates with other mobile stations 10 in the communication system 1 via the short-range communication unit 18.

  The evacuation control unit 103 (first evacuation control unit) manages control for giving an evacuation instruction to the user of the mobile station 10. Specifically, the evacuation control unit 103 causes the display unit 13 to display an evacuation map. Further, the evacuation control unit 103 generates an evacuation map instead of the base station 20 when a disaster occurs and communication with the base station 20 becomes impossible.

Next, the operation of the communication system 1 will be described.
<Operation at the time of disaster>
FIG. 7 is a sequence diagram showing a flow of processing executed in the communication system 1 when a disaster occurs.
When a disaster occurs, the disaster notification device 40 transmits a disaster notification signal to each device in the communication system 1. Specifically, when receiving the disaster notification signal from the disaster notification device 40, the disaster management server 30 transfers the disaster notification signal to the base station 20 in the disaster occurrence area. Further, the disaster notification signal is transferred from the base station 20 to the mobile station 10 connected to the base station 20 (step S1). The disaster management server 30, the base station 20, and the mobile station 10 that have received the disaster notification signal recognize information included in the disaster notification signal and store the recognized information.

  FIG. 8 is a diagram illustrating a configuration example of a disaster notification signal. The disaster notification signal shown in FIG. 8A is a signal that notifies the occurrence of an earthquake. This disaster notification signal includes, for example, a communication mode at the time of disaster, a warning issued regarding the disaster that occurred, the type of disaster, the date and time of disaster occurrence (date and time), the location of the disaster (in the case of an earthquake, the region of the epicenter Name and the latitude and longitude of the epicenter), the magnitude of the disaster (magnitude and maximum seismic intensity in the case of an earthquake), and information on the disaster occurrence area. However, information on the communication mode at the time of disaster is given by the disaster management server 30 or the base station 20, for example. The disaster communication mode is a mode related to communication of the communication system 1 when a disaster occurs. The disaster communication mode specified by the disaster notification signal is a network mode in which communication via the core network 100 is performed. The disaster notification signal is transmitted to, for example, the base station 20 and the mobile station 10 in the area designated as the disaster occurrence area by the disaster notification signal. The disaster notification signal shown in FIG. 8B is a signal that notifies the occurrence of a tsunami caused by an earthquake. This disaster notification signal includes, for example, information on the expected arrival date and time of the first tsunami wave in addition to the information described in FIG.

  Returning to FIG. 7, the mobile station 10 performs positioning processing in response to the reception of the disaster notification signal, and transmits the position information of its own device to the base station 20. This position information is transferred from the base station 20 to the disaster management server 30 (step S2). The disaster management server 30 generates an evacuation map based on the received position information (step S3) and transmits it to the base station 20. This evacuation map is transferred from the base station 20 to the mobile station 10 that is the transmission source of the position information (step S4). Then, the mobile station 10 displays the received evacuation map (step S5).

  FIG. 9 is a diagram illustrating an example of an evacuation map. FIG. 9 shows an evacuation map RM1 displayed on the mobile station 10A. In the evacuation map RM1, the current position of the mobile station 10A is indicated by “☆”, and the evacuation place that guides the user of the mobile station 10A is indicated by “★”. Further, the evacuation map RM1 indicates a movement route for guiding the user to the evacuation place by an arrow. The user of the mobile station 10A moves to the evacuation site with reference to the evacuation map RM1.

Returning to FIG. 7, the base station 20 performs the first band control process based on the received disaster notification signal (step S6). The first band control process is a band control process that is performed in response to reception of a disaster notification signal. FIG. 10 is a flowchart showing the flow of the first band control process.
The base station 20 determines whether a warning regarding tsunami has been announced based on the received disaster notification signal (step S61). The tsunami warning is one of a large tsunami warning, a tsunami warning, and a tsunami warning issued by the Japan Meteorological Agency. When the disaster notification signal described with reference to FIG. 8A has been received, the base station 20 determines that a warning regarding a tsunami has not been announced (step S61; NO). In this case, the base station 20 determines whether or not a disaster occurrence place has been identified based on the disaster notification signal (step S62). If it is determined “YES” in the process of step S62, the base station 20 sets a priority band according to the distance from the disaster occurrence place to the own apparatus (step S63). The base station 20 specifies the latitude and longitude of the disaster occurrence site based on the disaster notification signal, and specifies the latitude and longitude of the place where the device is located based on information stored in the storage unit 24 in advance. Through the processing in step S63, the communication band used by the base station 20 is changed from the state shown in FIG. 6A to the state shown in FIG. 6B. At this time, the base station 20 performs variable control of the bandwidth of the priority band based on the following conditions (a-1) to (a-3) regarding the distance from the disaster occurrence place to the base station 20.
(A-1) In the case of less than 1 km, 50% of the communication band is set as the priority band.
(A-2) When the distance is 1 km or more and less than 3 km, 35% of the communication band is set as the priority band.
(A-3) In the case of 3 km or more, 20% of the communication band is set as the priority band.

  In other words, the base station 20 increases the bandwidth of the priority band in the communication band as the disaster occurrence place and the base station 20 are closer, and conversely, the priority in the communication band increases as the disaster occurrence place and the base station 20 are farther away. Reduce the bandwidth of the band. If it is determined “NO” in the process of step S62, the base station 20 ends the first band control process.

If the disaster notification signal of FIG. 8B has been received, the base station 20 determines that a warning regarding tsunami has been announced in the process of step S61 (step S61; YES). In this case, the base station 20 sets a priority band according to the altitude in the communication area of the own device (step S64). Here, the base station 20 performs variable control of the bandwidth of the priority band based on the following conditions (b-1) and (b-2) regarding the lowest elevation point in the communication area.
(B-1) When the lowest altitude point in the communication area is lower than the maximum wave height predicted by the tsunami warning, 50% of the communication band is set as the priority band.
(B-2) If the lowest elevation point in the communication area is greater than or equal to the maximum wave height predicted by the tsunami warning, the priority band setting in the communication band is not changed.

  As for tsunami warnings, the maximum wave height is predicted to be 10 m for large tsunami warnings, the maximum wave height is predicted to be 3 m for tsunami warnings, and the maximum wave height for tsunami warnings. It is assumed that the height is 1 m. However, the relationship between the tsunami warning and the maximum wave height is not limited to this example.

FIG. 12 is a diagram for explaining an example of setting a priority band. As shown in FIG. 12, when the lowest altitude point in the communication area Cel-A of the base station 20A is 0 m and the lowest altitude point in the communication area Cel-B of the base station 20B is 1 m, the maximum wave is detected by the tsunami warning. The height is expected to be 3m. Accordingly, the base stations 20A and 20B set the priority bandwidth to 50%. On the other hand, when the lowest altitude point in the communication area Cel-C of the base station 20C is 4 m, the lowest altitude point is higher than the maximum wave height predicted by the tsunami warning. Therefore, the base station 20C sets a priority band based on the disaster notification signal regarding the earthquake. If the distance between the base station 20C and the disaster occurrence site is 1 km or more and less than 3 km, the base station 20C sets the priority bandwidth to 35%.
The above is the description of the first band control process.

Returning to FIG. 7, the base station 20 performs a first correction process (step S7). The first correction process is a process for correcting the bandwidth of the priority band set in the first band control process as time elapses. FIG. 11 is a flowchart showing the flow of the first correction process.
First, the base station 20 determines whether or not a priority band is set in the process of step S63 (step S71). If it is determined as “YES” in the process of step S71, the base station 20 corrects the bandwidth of the priority band based on the following condition (c-1) regarding the elapsed time from the occurrence of the disaster (step S72). .
(C-1) The bandwidth ratio of the priority bandwidth is reduced by 10% every time 1 hour has passed since the reception date and time of the disaster notification signal.

  FIG. 13 is a diagram for explaining variable control of the bandwidth of the priority band in the first correction process in step S72. As shown in FIG. 13, when the bandwidth of the priority band is set to 35% at 16:00, the base station 20 sets the bandwidth of the priority bandwidth to 25% and 18:00 at 17:00. The priority bandwidth is set to 15%, the priority bandwidth is set to 5% at 19:00, and the priority bandwidth is set to 0% at 20:00.

On the other hand, if “NO” is determined in the process of step S71, that is, if the process priority band of step S64 is set, the base station 20 proceeds to the process of step S73. When the predicted arrival date and time of the first wave is specified based on the disaster notification signal (step S73; YES), the base station 20 satisfies the following condition (c- 2), the bandwidth of the priority band is corrected (step S74), and if the expected arrival date and time of the first wave is not specified (step S73; NO), the following regarding the elapsed time from the occurrence of the disaster Based on the conditions (c-2) and (c-3), the bandwidth of the priority band is corrected (step S75).
(C-2) The bandwidth of the priority band is reduced by 10% every time one hour elapses with reference to the expected arrival date and time of the first wave.
(C-3) The bandwidth of the priority bandwidth is reduced by 10% every time one hour has passed with reference to the reception date and time of the disaster notification signal.

Normally, if a new disaster does not occur, the congestion of the core network 100 tends to be eliminated as the elapsed time from the disaster occurrence becomes longer. Therefore, the base station 20 performs the first correction process, and by reducing the bandwidth of the priority band with time, communication other than disaster-related information may be delayed or communication may be disabled. Suppress.
Further, the base station 20 may change the priority band by analyzing the disaster-related information so as to be limited to an emergency area where the user has to evacuate to a safe area. Thereby, the influence on the communication via the network 100 performed by a general user who is not in the emergency area can be minimized.
The above is the description of the first correction process.

  By the way, in the communication system 1, the mobile station 10 transmits position information to the base station 20 periodically (for example, at a predetermined interval), thereby repeatedly executing the processes of steps S2 to S5 (for example, FIG. 7). Steps S8 to S12). Thereby, the evacuation map displayed on the mobile station 10 is updated one by one according to the transmission cycle of the position information. Here, the transmission cycle of the position information is set so as to be shorter as the disaster location and the mobile station 10 are closer. Alternatively, in the communication system 1, the position information transmission cycle may be shortened according to the urgency of the user of the mobile station 10. By shortening the transmission cycle of the position information, according to the communication system 1, the update frequency of the evacuation map is increased in the mobile station 10 of the necessary user, and conversely, the update frequency is updated in the mobile station 10 of the less urgent user. Is not so high, congestion of the core network 100 is suppressed. The transmission cycle may be defined by the mobile station 10 in addition to the transmission frequency of the positioning request from the base station 20 to the mobile station 10.

<Operation when generating disaster data>
FIG. 14 is a sequence diagram showing a flow of processing executed in the communication system 1 when disaster data is generated in the mobile station 10. Hereinafter, the operation when the mobile station 10A generates disaster data will be described as an example.
When instructed to generate disaster data by an operation performed by the user, the mobile station 10A performs disaster data generation processing (step S21).

FIG. 15 is a flowchart showing the flow of disaster data generation processing. FIG. 16 is a diagram illustrating screen transitions in the display unit 13 during the disaster data generation process.
First, the mobile station 10A determines whether or not to make a rescue request based on an operation performed by the user (step S211). When the mobile station 10A does not make a rescue request (step S211; NO), the mobile station 10A starts a process of generating disaster data indicating a disaster occurrence state around the own device.
Next, 10 A of mobile stations start imaging | photography by the imaging | photography part 14, and are changed to display screen SC1 shown to Fig.16 (a). On the display screen SC1, disaster icons I1 to I3, photographing mode buttons b1 and b2, and a pull-down menu pm are arranged so as to overlap the photographed image IM of the photographing unit 14. The disaster icons I1 to I3 are icons operated by the user in order to designate a disaster that has occurred. The disaster icons I1 to I3 correspond to an earthquake, a tsunami, and a tornado in order. The shooting mode buttons b1 and b2 are icons operated by the user in order to specify which of the still image data or the moving image data is to be recorded (in the example of FIG. 16A, a moving image is specified). ). The shooting mode button b1 corresponds to a still image, and the shooting mode button b2 corresponds to a moving image. The pull-down menu pm is a pull-down menu operated by the user to specify the floor of the building where the user is currently located (in the example of FIG. 16A, the third floor is specified).

  Next, the mobile station 10A specifies the occurrence position of the event related to the disaster (step S212). In the captured image IM, a tsunami W generated due to an earthquake is captured. In this case, as shown in the display screen SC2 of FIG. 16B, the user performs an operation of moving the finger F to the disaster icon I2 corresponding to the tsunami to the position of the tsunami W. The mobile station 10A specifies the tsunami occurrence position (x1, y1, z1) according to the position of the disaster icon I2 after movement. Here, x1 corresponds to longitude, y1 corresponds to latitude, and z1 corresponds to altitude. The mobile station 10A, based on the position of the disaster icon I2 after movement, the shooting direction and shooting conditions of the shooting unit 14 measured by the sensor unit 16, and the position information of its own device, the tsunami generation position (x1 , Y1, z1).

  Next, the mobile station 10A specifies the moving direction of the event related to the disaster (step S213). Here, the mobile station 10A specifies the moving direction of the tsunami W. As shown in the display screen SC3 in FIG. 16C, the user performs an operation of touching the finger F to the position where the tsunami W has moved. In response to this operation, the mobile station 10A displays an arrow image Ar starting from the position of the disaster icon I2 and ending at the position of the finger F. Then, the mobile station 10A specifies the moving direction (x2, y2, z2) of the tsunami corresponding to the position of the end point of the arrow image Ar. Here, x2 corresponds to longitude, y2 corresponds to latitude, and z2 corresponds to altitude. As with the event occurrence position, the mobile station 10A determines the tsunami based on the position of the finger F, the shooting direction and shooting conditions of the shooting unit 14 measured by the sensor unit 16, and the position information of the own device. The moving direction (x2, y2, z2) is specified.

Note that the mobile station 10A may accept an operation in which the user moves the finger F while touching the position of the end point of the arrow image Ar to adjust (finely adjust) the moving direction of the event. Alternatively, the user may accept an operation of moving the finger F while touching the position of the start point of the arrow image Ar, and adjust (finely adjust) the occurrence position of the event. Also, the mobile station 10A specifies the moving direction and height of the wave from the captured image (captured video) of the imaging unit 14 using an application program that analyzes the moving direction and height of the event wave. Also good.
Note that the designation of the moving direction of the event by the user may be omitted. The mobile station 10A does not specify the moving direction of the tsunami when the button b3 marked “Do not register direction” on the display screen SC3 is operated.
The mobile station 10A uses the data sets (x1, y1, z1) and (x2, y2, z2) as vector data obtained by vectorizing the occurrence position and the moving direction of an event related to a disaster.

Next, 10 A of mobile stations measure the battery remaining charge in the battery part 19 (step S214). The remaining battery level is represented by a percentage value based on the full charge.
Then, the mobile station 10A generates disaster data indicating the disaster occurrence status (step S215).

FIG. 17 is a diagram illustrating a configuration example of disaster data indicating a disaster occurrence state. FIG. 17A shows disaster data in the case where the remaining battery level measured in the process of step S214 is equal to or greater than a threshold value. FIG. 17B shows disaster data when the remaining battery level measured in step S214 is less than the threshold value. Here, the threshold of the remaining battery level is a predetermined remaining battery level, for example, 50%.
As shown in FIG. 17A, when the remaining battery level is equal to or greater than the threshold value, the disaster data indicating the disaster occurrence status includes the disaster communication mode (in this case, the network mode), the received emergency bulletin, the disaster type, Disaster occurrence date and time, captured video type (still image or video), remaining battery level, video shooting date and time, location information (latitude and longitude) indicating the current location of the mobile station 10A, and user of the mobile station 10 Each information including the floor where there is, the disaster code specified by the disaster icon selected by the user, the vector data, the video data indicating the photographed image, and the size of the video data. As shown in FIG. 17B, when the remaining battery level is less than the threshold value, the disaster data does not include video data and video data size information, but otherwise the same as when the remaining battery level is equal to or higher than the threshold value. Information. When the remaining battery level of the mobile station 10A is equal to or greater than the threshold value, the disaster data includes video data in order to convey in detail the occurrence of the disaster. The mobile station 10A may process the data size of the video data to a predetermined size or less (eg, 500 kilobytes) or less to generate disaster data. On the other hand, when the remaining battery level of the mobile station 10A is less than the threshold value, video data is not included in the disaster data in order to suppress a decrease in the remaining battery level of the mobile station 10A. In this case, the mobile station 10A stores the video data in the storage unit 15 without transmitting the video data. At this time, the mobile station 10A may determine the transmission timing of the disaster data based on the remaining battery level and the urgency of the information included in the disaster data. The urgency of the information is determined based on specific conditions such as, for example, that an event occurrence position is close to an area where a person is present, or an event moving direction is directed to an area where a person is present.

  Returning to FIG. 15, when it is determined that a rescue request is made in the process of step S <b> 211 (step S <b> 211; YES), the mobile station 10 </ b> A measures the remaining battery level in the battery unit 19 (step S <b> 216). Then, the mobile station 10A generates disaster data indicating a rescue request (step S217). The disaster data indicating the rescue request includes, for example, location information of the mobile station 10A and information on the remaining battery level.

Returning to FIG. 14, the mobile station 10A transmits the generated disaster data to the base station 20A. The mobile station 10A transmits the disaster data after adding a terminal identifier (for example, a telephone number) for identifying the mobile station 10A to the disaster data. The disaster data transmitted by the mobile station 10A is transferred from the base station 20A to the disaster management server 30 (step S22).
When disaster data that does not include video data is transmitted, the mobile station 10A transmits the video data to the disaster management server 30 separately from the disaster data at a timing when the remaining battery level is recovered to a threshold value or more. .

The disaster management server 30 performs other base station influence prediction processing based on the received disaster data (step S23). The other base station influence prediction process is a process for predicting the influence of the disaster specified from the disaster data on the communication area of the base station. For example, when the disaster identified from the disaster data is a tsunami, a base station within a predetermined distance (for example, 1 km or less) from the coast is predicted to be a base station that may be affected by the disaster. When the disaster is a tornado, a base station within a predetermined distance (for example, 1 km or less) from the tornado occurrence position is predicted to be a base station that may be affected by the disaster.
Then, the disaster management server 30 generates (updates) an evacuation map based on the received disaster data (step S24).

  FIG. 18 is a diagram illustrating an example of an evacuation map generated by the process of step S24. FIG. 18 shows an evacuation map RM2 provided to the mobile station 10A. As shown in FIG. 18, in the evacuation map RM2, in addition to the matters described in the evacuation map RM1, the event (tsunami) is based on the vector data (x1, y1, z1), (x2, y2, z2). The generation position and the moving direction are shown using an arrow image Ima. The arrow images Imb and Imb shown in FIG. 18 are attached based on disaster data generated by mobile stations 10 other than the mobile station 10A. Further, each of “◎” shown in FIG. 18 means a position where photographing for obtaining the arrow images Imb and Imc is performed. The user of the mobile station 10 </ b> A can move to the evacuation site with reference to the evacuation map RM <b> 2 and can grasp the occurrence situation of the disaster (tsunami).

  The disaster management server 30 transmits the generated evacuation map to the mobile station 10A via the base station 20A (step S25). Furthermore, when the base station 20B is specified by the other base station influence prediction process, the disaster management server 30 transmits the generated evacuation map to the mobile station 10B via the base station 20B (step S26). The mobile stations 10A and 10B display the received evacuation map (steps S27 and S28).

The base station 20A that has received the disaster data transmitted in step S22 performs a second bandwidth control process based on the received disaster data (step S29). The second bandwidth control process is a bandwidth control process that is performed when disaster data is received. FIG. 19 is a flowchart showing the flow of the second band control process.
The base station 20A determines whether the disaster data is the first received after receiving the disaster notification signal (step S291). If “YES” is determined in the step S291, the base station 20A secures the bandwidth of the priority band by 5% (step S292). Here, if the bandwidth of the priority band is 5% or more before the determination, it is maintained as it is, and if it is less than 5%, the bandwidth of the priority band is set to 5%. In addition, the base station 20A does not become less than 5% until the reservation of 5% of the priority bandwidth is released.

Next, the base station 20A determines whether the disaster that has occurred is a tsunami (step S293). If the disaster is a tsunami (step S293; YES), the base station 20A sets the coast (shoreline) as the disaster occurrence location, and sets a priority band according to the distance from the disaster occurrence location (step S294). Here, the base station 20A performs variable control of the bandwidth of the priority band based on the following conditions (a-4) to (a-6) regarding the distance from the disaster occurrence site.
(A-4) In the case of less than 1 km, 50% of the communication band is set as the priority band.
(A-5) When the distance is 1 km or more and less than 3 km, 35% of the communication band is set as the priority band.
(A-6) In the case of 3 km or more, 20% of the communication band is set as the priority band.

When the disaster is not a tsunami (step S293; NO) and is a tornado (step S295; YES), the base station 20A sets a priority band according to the distance from the position of the tornado (ie, disaster occurrence location). (Step S296). Here, the base station 20A performs variable control of the bandwidth of the priority band based on the following conditions (a-7) to (a-9) regarding the distance from the disaster occurrence site.
(A-7) When the distance is less than 1 km, 50% of the communication band is set as the priority band.
(A-8) When the distance is 1 km or more and less than 3 km, 35% of the communication band is set as the priority band.
(A-9) In the case of 3 km or more, 20% of the communication band is set as the priority band.
When the disaster is not a tsunami (step S293; NO) and is not a tornado (step S295; NO), the base station 20A ends the second band control process.

Returning to FIG. 14, the base station 20A performs the second correction process (step S30). The second correction process is a process for correcting the bandwidth of the priority band set in the second band control process as time elapses. FIG. 20 is a flowchart showing the flow of the second correction process.
The base station 20A determines whether or not the disaster data has been received continuously for a predetermined time (for example, 1 hour) since the disaster data was first received (step 301). When the disaster data is received within a predetermined time from when the disaster data is first received (step 301; YES), the base station 20A satisfies the following condition (d-1) regarding the temporal change in the amount of received disaster data. Based on this, the bandwidth of the priority bandwidth is corrected (step S302).
(D-1) When the amount of disaster data received every minute increases n times, the bandwidth of the priority band is increased n times. However, the upper limit of the priority bandwidth is 50%.

As shown in FIG. 21, the base station 20A receives one disaster data in the first minute, sets the priority bandwidth to 5%, and then triples three disasters in the next minute. When data is received, the priority bandwidth is tripled to 15%. Furthermore, when nine times of disaster data of 3 times are received in the next one minute, the base station 20A sets the bandwidth of the priority bandwidth to 3 times 45%. Furthermore, when 18 times of disaster data that is doubled in the next minute is received, the base station 20A doubles the bandwidth of the priority band, but here, the bandwidth of the priority band does not exceed the upper limit. Thus, it is 50%. As a result, when the amount of disaster data received per unit time increases and disaster data transmission / reception is expected to be frequently performed in the future, the base station 20A increases the bandwidth of the priority band in advance. Further, when 6 disaster data of 1/3 times are received in the next minute, the base station 20A sets the bandwidth of the priority bandwidth to 30%, which is 1/3 times.
On the other hand, if it is determined “NO” in the process of step S301, the base station 20A releases the reservation of the priority band set in the process of step S302 (step S303).
The above is the description of the operation of the communication system 1 in the network mode in which the base station 20 can communicate with the core network 100.

<Operation in base station mode>
In the event of a disaster, for example, when communication becomes impossible due to congestion of the core network 100 or failure of the core network device, the base station 20 performs the operation described below with respect to communication with the mobile station 10.
FIG. 22 is a sequence diagram showing a flow of processing executed in the communication system 1 when the base station 20A becomes unable to communicate with the core network 100. Hereinafter, the operation when the mobile station 10A generates disaster data will be described as an example.
When communication with the core network 100 (disaster management server 30) becomes impossible, the base station 20A changes the disaster communication mode to the base station mode (step S41). The base station mode is a mode in which the base station 20 generates (updates) an evacuation map in place of the disaster management server 30. Then, the base station 20A notifies the mobile station 10A that it has transitioned to the base station mode (step S42). Information for notifying the base station mode corresponds to the disaster-related information described above. Next, the base station 20A transmits the latest evacuation map received from the disaster management server 30 to the mobile station 10A (step S43), and the mobile station 10A displays this evacuation map (step S44).

Thereafter, when the mobile station 10A executes the disaster data generation process to generate disaster data (step S45), the mobile station 10A transmits the disaster data to the base station 20A (step S46). The disaster data generation process here may be the same as the process of step S21. However, when the base station 20 operates in the base station mode, the mobile station 10A designates the base station mode as the disaster communication mode and generates disaster data that does not include video data regardless of the remaining battery level. When the base station 20A receives the disaster data from the mobile station 10A, the base station 20A generates an evacuation map based on the received disaster data and transmits it to the mobile station 10A (steps S47, S48). The evacuation map received from 20A is displayed (step S49).
Thereafter, the base station 20A executes the second band control process and the second correction process in the procedure described in steps S29 and S30 (steps S50 and S51).

<Operation when returning to network mode>
Thereafter, when communication with the core network 100 becomes possible, the base station 20A returns to the network mode (step S52 in FIG. 23). Then, the base station 20A transmits disaster data that has been received from the mobile station 10A but has not been transmitted to the disaster management server 30 to the disaster management server 30 (step S53). Next, the base station 20A transmits a video data transmission request that the mobile station 10A did not include in the disaster data to the mobile station 10A (step S54). For example, the mobile station 10A recognizes that the communication system 1 has returned to the network mode in response to a transmission request for received video data. The mobile station 10A transmits untransmitted video data to the base station 20A in response to receiving the video data transmission request. At this time, the mobile station 10A transmits video data when the remaining battery level of the battery unit 19 is equal to or greater than the threshold value, but waits for the remaining battery level to recover to the threshold value or less when it is less than the threshold value. To send. The base station 20A transfers the video data received from the mobile station 10A to the disaster management server 30 (step S55).

Next, the disaster management server 30 performs other base station influence prediction processing based on the disaster data received from the base station 20A (step S56). Here, the other base station influence prediction process is a process for predicting the influence of the disaster specified from the disaster data on the communication area of the base station. FIG. 24 is a flowchart showing a flow of other base station influence prediction processing.
The disaster management server 30 determines whether the vector indicated by the vector data included in the disaster data is facing another base station or its communication area (step S561). For example, the disaster management server 30 specifies the base station 20 in which the communication area exists on the extension line of the vector indicated by the vector data on the evacuation map. If there is no corresponding base station 20 (step S561; NO), the disaster management server 30 determines that there is no disaster effect on other base stations, and ends the other base station influence prediction process.

  Here, it is assumed that the disaster management server 30 specifies that the vector indicated by the vector data faces the base station 20B, and determines “YES” in the process of step S561. In this case, the disaster management server 30 determines whether the base station 20B has received disaster data that has a newer generation time than the base station 20A (step S562). If it is determined “YES” in the process of step S562, the disaster management server 30 ends the other base station influence prediction process.

  If it is determined “NO” in the process of step S562, the disaster management server 30 determines whether the disaster identified by the disaster data is a tsunami, a tornado, or any other (step S563). When the disaster is neither a tsunami nor a tornado (step S563; NO), the disaster management server 30 ends the other base station influence prediction process.

  When the disaster is a tornado (step S563; tornado), the disaster management server 30 determines to transmit disaster occurrence information indicating that a tornado has occurred in the past to the base station 20B (step S564). The disaster occurrence information includes, for example, information such as the disaster occurrence location and the scale of occurrence.

  When the disaster is a tsunami (step S563; tsunami), the disaster management server 30 determines whether or not the expected arrival date and time of the first wave has passed (step S565). When the disaster management server 30 has passed the expected arrival date and time of the first wave (step S565; YES), the disaster occurrence information indicating that a tsunami has occurred in the past in another base station that may be affected by the tsunami Is transmitted to the base station 20B (step S566). If the expected arrival date and time of the first wave has not elapsed (step S565; NO), the disaster management server 30 determines to transmit disaster occurrence information indicating that there is a possibility of being affected by the tsunami to the base station 20B. (Step S567).

  Returning to FIG. 23, the disaster management server 30 generates an evacuation map and transmits it to the mobile station 10A via the base station 20A (steps S57 and S58). The mobile station 10A displays the received evacuation map (step S59). When the base station 20B is specified by the other base station influence prediction process, the disaster management server 30 transmits disaster occurrence information to the mobile station 10B via the base station 20B (step S60). The mobile station 10B notifies based on the received disaster occurrence information (step S61). By the notification performed based on the disaster occurrence information, the user of the base station 20B can grasp the disaster occurrence state in the vicinity of the user.

<Operation in terminal mode>
When a disaster occurs, for example, when the processing load on the base station 20 increases or the base station 20 fails and communication with the base station 20 becomes impossible, the mobile station 10 performs the operation described below. FIG. 25 is a sequence diagram of processing executed by the mobile station 10 when the base station 20 becomes unable to communicate. Hereinafter, the operations of the mobile stations 10A-1, 10A-2, and 10A-3 will be described as examples of the mobile station 10 in the communication area of the base station 20A.

When communication with the base station 20 becomes impossible, the mobile station 10A-1 transitions to the terminal mode (step S71). The terminal mode is a mode in which a plurality of mobile stations 10 transmit and receive evacuation maps with each other. Then, the mobile station 10A-1 determines whether or not the evacuation map is stored in the storage unit 15 (step S72). When the evacuation map is not stored in the storage unit 15 (step S72; NO), the mobile station 10A-1 is connected to the mobile station 10A-2 storing the evacuation map by the short-range communication unit 18 (step S72). S73). Then, the mobile station 10A-2 transmits the evacuation map stored in the storage unit 15 to the mobile station 10A-1 by the short-range communication unit 18 (step S74). Then, the mobile station 10A-1 displays the received evacuation map (step S75).
When the mobile station 10A-1 stores the evacuation map in the storage unit 15 (step S72; YES), when connected to the mobile station 10A-3 (step S76), the evacuation map stored in the storage unit 15 Is transmitted to the mobile station 10A-3 by the short-range communication unit 18 (step S77).

  As described above, even when the mobile station 10 cannot communicate with the base station 20, the mobile stations 10 are connected to each other without passing through the base station 20, and transmit and receive evacuation maps. Not only transmission / reception of an evacuation map but the mobile station 10 may generate (update) an evacuation map based on disaster data generated by its own device. The process performed by the mobile station 10 in this case may be the same as the process performed by the disaster management server 30 or the base station 20.

  According to the communication system 1 of the embodiment described above, the base station 20 communicates with the mobile station 10 by autonomously performing variable control of the bandwidth of the priority band in the communication band when a disaster occurs. Can do.

The present invention can be implemented in a form different from the above-described embodiment. The present invention can also be implemented in the following forms, for example. Further, the following modifications may be combined as appropriate.
(Modification 1)
In the above-described embodiment, the base station 20 performs the variable control of the bandwidth of the priority band by executing the first band control process. For example, when the disaster is a tsunami, the disaster management server 30 may instruct the base station 20 to perform the variable control of the bandwidth of the priority band when the height of the tsunami is not specified by the disaster notification signal. .
As shown in FIG. 26, the disaster management server 30 transmits a priority band setting instruction to the base station 20A after executing the other base station influence process described in step S23 (step S81). The priority band setting instruction is an instruction to set a priority band for increasing the bandwidth according to the distance from the coast. For example, the priority band setting instruction is set based on the same conditions as the conditions (a-4) to (a-6) described above. Is done. Then, the base station 20A sets the priority band according to the priority band setting instruction (step S82). When the base station 20B is specified by the other base station influence process, the disaster management server 30 transmits a priority band setting instruction to the base station 20B (step S83). Then, the base station 20B sets the priority band according to the priority band setting instruction (step S84).

(Modification 2)
In the communication system 1, video data registered in the disaster management server 30 may be displayed on the mobile station 10. In this case, the mobile station 10 transmits a video transmission request designating the shooting date and area and the area to the disaster management server 30. The disaster management server 30 transmits the registered video data to the mobile station 10 based on the received video transmission request. The disaster management server 30 may also register information on the shooting position and shooting direction of the video data, and transmit the information to the mobile station 10 together with the video data.
When the disaster management server 30 determines that there is unregistered video data based on the shooting date and time or the communication area, the disaster management server 30 may transmit a request for registration of the video data to the mobile station 10. In this case, if the mobile station 10 stores the corresponding video data, the mobile station 10 transmits it to the disaster management server 30 and registers it.

(Modification 3)
In the communication system 1 of the above-described embodiment, the occurrence of a disaster is detected based on the reception of the disaster notification signal, but the present invention is not limited to this example. For example, the base station 20 may detect the occurrence of a disaster based on the amount of disaster data received from the mobile station 10. As an example, the base station 20 detects the occurrence of a disaster and sets a priority band when the amount of disaster data received per unit time exceeds a threshold value. In addition, the base station 20 may refer to temporal changes in the amount of disaster data received per unit time. In this case, the base station 20 may detect the occurrence of a disaster and set a priority band, for example, when the amount of increase in received amount per unit time is equal to or greater than a threshold value.

(Modification 4)
A part of the configuration of the above-described embodiment may be omitted. For example, in the communication system 1, an operation corresponding to the base station mode or the terminal mode may not be performed. Further, in the communication system 1, the other base station influence process in step S23 and step S56 may be omitted. Further, the base station 20 may omit one of the first band control process and the second band control process. In addition, the base station 20 may not perform one or both of the first correction process and the second correction process.
Each numerical value listed in the embodiment described above is merely an example, and may be changed as appropriate.
Further, the relationship between the operation performed by the user described in the above-described embodiment and the process executed by the mobile station 10 is merely an example, and the operation method may be changed, for example.
In the communication system 1 of the above-described embodiment, an evacuation instruction is given to the user of the mobile station 10 based on the evacuation map. The method of evacuation instruction is not limited to this example. For example, evacuation instruction data for issuing an evacuation instruction by, for example, outputting voice guidance or an alarm sound may be generated.

In the communication system 1, the process performed by the disaster management server 30 based on the disaster related information is not limited to the generation of evacuation instruction data. For example, the disaster management server 30 may provide the server administrator with the result of collecting and analyzing information about the disaster that has occurred.
The types of disasters supported by the disaster communication system of the present invention are not particularly limited and include, for example, typhoons, lightning strikes, floods, volcanic eruptions, landslides, etc., in addition to earthquakes, tsunamis, and tornadoes. For this reason, the event for which vector data is generated in the disaster data generation process is not limited to a tsunami (for example, a tornado or earth and sand).
The disaster-related information is not limited to the information described above as long as it is information related to a disaster. Further, when there are a plurality of types of disaster-related information, priority communication is performed for only some of them, and priority communication may not be performed for the rest.
In the above-described embodiment, the mobile station 10 performs the positioning process using the GPS sensor. However, for example, the mobile station 10 may perform the positioning process using another method such as base station positioning.

(Modification 5)
The mobile station 10 is not limited to a smartphone, but may be another device (mobile communication terminal) such as a feature phone, a tablet terminal, a personal computer, a PDA (Personal Digital Assistant), or a mobile computer.
In each embodiment described above, each function realized by the control unit 11 of the mobile station 10 and the control unit 21 of the base station 20 is realized by a combination of a plurality of programs or a combination of a plurality of hardware resources. sell. When the function of the control unit 11 is realized using a program, the program includes a magnetic recording medium (magnetic tape, magnetic disk (HDD (Hard Disk Drive), FD (Flexible Disk)), etc.), optical recording medium (optical disk). Etc.), may be provided in a state of being stored in a computer-readable recording medium such as a magneto-optical recording medium or a semiconductor memory, or may be distributed via a network. The present invention can also be understood as a disaster communication method.

DESCRIPTION OF SYMBOLS 1 ... Communication system 10, 10A, 10B, 10C ... Mobile station, 101 ... Disaster data generation part, 102 ... Communication control part, 103 ... Evacuation control part, 11 ... Control part, 111 ... CPU, 112 ... ROM, 113 ... RAM, 12 ... operation section, 13 ... display section, 14 ... photographing section, 15 ... storage section, 16 ... sensor section, 17 ... wireless communication section, 18 ... short-range communication section, 19 ... battery section, 20, 20A, 20B , 20C ... base station, 201 ... band control unit, 202 ... communication control unit, 203 ... evacuation control unit, 21 ... control unit, 211 ... CPU, 212 ... ROM, 213 ... RAM, 22 ... mobile station communication unit, 23 ... Network communication unit, 24 ... storage unit, 30 ... disaster management server, 31 ... control unit, 32 ... network communication unit, 33 ... notification signal receiving unit, 34 ... storage unit, 40 ... disaster notification device.

Claims (9)

A mobile station device;
A base station device that communicates with the mobile station device using a frequency band selected from available communication bands;
A server device communicating with the base station device,
The base station device
In the communication band, a bandwidth control unit that variably controls the bandwidth of a priority band that gives priority to communication of disaster-related information;
A communication control unit that performs priority communication of disaster-related information using the frequency band included in the priority band, and
The mobile station device
A shooting section;
Disaster-related information indicating the occurrence status of a disaster or a rescue request, the occurrence position and movement direction of the event related to the disaster, the position in the captured image of the event captured by the imaging unit, the direction of the imaging, and the A transmission processing unit that identifies the location of the mobile station device at the time of shooting and transmits disaster-related information including vector data obtained by vectorizing the identified occurrence position and movement direction to the base station device,
The server device
A disaster communication system comprising: a process execution unit that executes predetermined processing based on disaster-related information received from the mobile station apparatus via the base station apparatus. A mobile station device;
A base station device that communicates with the mobile station device using a frequency band selected from available communication bands;
A server device communicating with the base station device;
With
The base station apparatus uses the bandwidth control unit that variably controls the bandwidth of a priority band that prioritizes communication of disaster-related information in the communication band, and the disaster-related using the frequency band included in the priority band A communication control unit for performing priority communication of information,
The mobile station apparatus has a transmission processing unit that transmits the position information of the own apparatus to the base station apparatus as the disaster related information;
The server apparatus executes processing for generating evacuation instruction data for issuing an evacuation instruction based on the position information of the mobile station apparatus received as the disaster-related information from the mobile station apparatus via the base station apparatus A processing execution unit
The communication control unit transmits the evacuation instruction data generated by the processing execution unit to the mobile station device,
The mobile station apparatus has a first evacuation control unit that performs an evacuation instruction for a user based on the evacuation instruction data received from the base station apparatus,
The base station device generates the evacuation instruction data based on the location information of the mobile station device received as the disaster-related information from the mobile station device when communication with the server device is impossible. 2 Has an evacuation control unit,
The communication control unit transmits the evacuation instruction data generated by the second evacuation control unit to the mobile station device when communication with the server device is impossible,
The first evacuation control unit transmits and receives the evacuation instruction data to and from the other mobile station device when communication with the base station device is impossible.
Disaster communication system. The bandwidth controller is
Of the distance between the disaster occurrence place and the base station device, the elapsed time since the disaster occurred, the temporal change in the amount of disaster-related information received by the base station device, and the altitude in the communication area of the base station device The disaster communication system according to claim 1 or 2, wherein the variable control is performed based on one or more of the following. The transmission processing unit
The disaster communication system according to claim 1, wherein disaster-related information indicating a disaster occurrence state or a rescue request is transmitted. The disaster related information indicating the occurrence status is as follows:
Including the vector data, and video data indicating a captured image of the event,
The transmission processing unit
The video data is transmitted at a timing according to the battery level of its own device,
The process execution unit
Based on the vector data, generate evacuation instruction data as disaster related information and transmit to the base station device,
The communication control unit
Transmitting the evacuation instruction data to the mobile station device;
The mobile station device is
The disaster communication system according to claim 4, further comprising a first evacuation control unit that issues an evacuation instruction to a user based on the evacuation instruction data received from the base station device. The transmission processing unit
Send the location information of your device,
The process execution unit
The disaster communication system according to claim 2 , wherein the evacuation instruction data is generated based on the received position information. The transmission processing unit
The disaster communication system according to claim 6, wherein the frequency of transmission of the location information is increased as the own apparatus and the disaster occurrence location are closer. A mobile station apparatus having an imaging unit;
A base station device that communicates with the mobile station device using a frequency band selected from available communication bands;
A server device communicating with the base station device;
The disaster communication method realized in
The base station device is
In the communication band, a bandwidth control step for variably controlling the bandwidth of the priority band that prioritizes communication of disaster-related information;
A communication control step for performing priority communication of disaster-related information using the frequency band included in the priority band;
The mobile station device is
A photographing step of photographing by the photographing unit;
Disaster-related information indicating a disaster occurrence status or a rescue request, and the occurrence position and movement direction of the event related to the disaster, the position in the captured image of the event captured in the imaging step, the shooting direction, and the A transmission processing step of identifying based on the position of the mobile station apparatus at the time of shooting, and transmitting disaster-related information including vector data obtained by vectorizing the identified occurrence position and movement direction to the base station apparatus,
The server device is
A process execution step of executing a predetermined process based on disaster-related information received from the mobile station apparatus via the base station apparatus;
Disaster communication method. A mobile station device;
A base station device that communicates with the mobile station device using a frequency band selected from available communication bands;
A server device communicating with the base station device;
The disaster communication method realized in
In the communication band, the base station apparatus variably controls a bandwidth of a priority band that prioritizes communication of disaster-related information, and uses the frequency band included in the priority band, and the disaster-related A communication control step for performing priority communication of information,
The mobile station apparatus has a transmission processing step of transmitting the position information of the own apparatus to the base station apparatus as the disaster related information,
The server device executes processing for generating evacuation instruction data for issuing an evacuation instruction based on the location information of the mobile station device received as the disaster-related information from the mobile station device via the base station device A process execution step to
In the communication control step, the base station device transmits the evacuation instruction data generated in the processing execution step to the mobile station device,
The mobile station device has a first evacuation control step of performing an evacuation instruction to a user based on the evacuation instruction data received from the base station device;
When the base station device cannot communicate with the server device, the base station device generates the evacuation instruction data based on the location information of the mobile station device received as the disaster-related information from the mobile station device. Has two evacuation control steps,
When the base station device cannot communicate with the server device in the communication control step, the evacuation instruction data generated in the second evacuation control step is transmitted to the mobile station device,
When the mobile station apparatus cannot communicate with the base station apparatus in the first evacuation control step, the mobile station apparatus transmits / receives the evacuation instruction data to / from another mobile station apparatus.
Disaster communication method.

Images