JP7060264B2 - Base station equipment, wireless communication system, control method and control program - Google Patents

Description

The present invention relates to a base station device, a wireless communication system, a control method and a control program.

In the event of a disaster such as an earthquake, it is urgent to identify the whereabouts of the victims in order to rescue them at an early stage. Therefore, there is known a technique for identifying the location of a victim by using a wireless terminal such as a mobile phone or a smartphone possessed by the victim.

As a technique related to the position information of a wireless terminal, for example, Patent Documents 1 to 4 are known. Patent Document 1 describes a technique for collecting location information of a victim by utilizing a function of a mobile phone when a disaster occurs and a base station cannot be used. Patent Document 2 describes a technique for notifying another mobile phone of the position information of a mobile phone when the function of the base station is stopped due to a disaster. Patent Document 3 describes a mobile information registration server that registers mobile information of a terminal. Patent Document 4 describes an information transmission system in which a disaster prevention wireless system and a mobile phone system are fused. Patent Documents 5 and 6 are known as other related techniques.

JP-A-2015-114899 Japanese Unexamined Patent Publication No. 2010-135908 International Publication No. 2009/125812 Japanese Unexamined Patent Publication No. 2006-28771 Japanese Unexamined Patent Publication No. 2019-047150 Japanese Unexamined Patent Publication No. 2002-15869

With related techniques such as Patent Documents 1 and 2, it is possible to grasp the position of a wireless terminal possessed by a disaster victim without using a base station in the event of a disaster. However, with related techniques, it is not possible to specify the position of a wireless terminal using a base station in the event of a disaster. That is, in the event of a disaster, although the base station can be used, the situation where the communication between the base station and the core network (Internet network) is cut off is not taken into consideration. Therefore, in the related technique, there is a problem that the position of the wireless terminal cannot be grasped by using the base station when the base station and the core network cannot be connected.

The present disclosure has been made to solve such a problem, and is a base station device, a wireless communication system, a control method and a control capable of grasping the position of a wireless terminal when the core network cannot be connected. The purpose is to provide a program.

The base station apparatus according to the present disclosure stores the acquisition unit for acquiring the position information of the first wireless terminal transmitted from the first wireless terminal and the acquired position information of the first wireless terminal. The stored position information is stored via the storage unit, the connection control unit that establishes a temporary communication connection with the second wireless terminal, and the established temporary communication connection when the core network cannot be connected. It is provided with a providing unit for providing to the second wireless terminal.

The wireless communication system according to the present disclosure includes a first wireless terminal, a second wireless terminal, and a base station apparatus, and the base station apparatus is the first wireless terminal transmitted from the first wireless terminal. Temporary communication with the second wireless terminal when the core network cannot be connected to the acquisition unit that acquires the position information of the wireless terminal and the storage unit that stores the acquired position information of the first wireless terminal. It includes a connection control unit for establishing a connection and a providing unit for providing the stored position information to the second wireless terminal via the established temporary communication connection.

The control method of the base station apparatus according to the present disclosure acquires the position information of the first wireless terminal transmitted from the first wireless terminal, and stores the acquired position information of the first wireless terminal. If the connection to the core network cannot be established, a temporary communication connection is established with the second wireless terminal, and the stored location information is provided to the second wireless terminal via the established temporary communication connection. It is something to do.

The control program executed by the base station apparatus according to the present disclosure acquires the position information of the first wireless terminal transmitted from the first wireless terminal, and the acquired position information of the first wireless terminal. If the core network cannot be connected, a temporary communication connection is established with the second wireless terminal, and the stored location information is transferred to the second wireless terminal via the established temporary communication connection. It is a control program that causes the base station device to execute the processing provided to the base station device.

According to the present disclosure, it is possible to provide a base station device, a wireless communication system, a control method, and a control program capable of grasping the position of a wireless terminal when the core network cannot be connected.

It is a schematic block diagram of the base station apparatus of Embodiment 1. FIG. It is a schematic block diagram of the wireless communication system of Embodiment 2. It is a figure of the connection sequence which concerns on Embodiment 2. FIG. 3 is a schematic configuration diagram of a wireless communication system according to the third embodiment. It is a figure of the connection sequence at the time of transition to a power saving mode in Embodiment 4.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Since the drawings are simple, the technical scope of the embodiment should not be narrowly interpreted based on the description of the drawings. Further, the same elements are designated by the same reference numerals, and duplicate description will be omitted.

In the following embodiments, when necessary for convenience, the description will be divided into a plurality of sections or embodiments. However, unless otherwise specified, they are not unrelated to each other, and one has a relationship of a part or all of the other, a modified example, an application example, a detailed explanation, a supplementary explanation, and the like. Further, in the following embodiments, when the number of elements (including the number, numerical value, quantity, range, etc.) is referred to, when it is specified in particular, or when it is clearly limited to a specific number in principle, etc. Except for, the number is not limited to the specific number, and may be more than or less than the specific number.

Furthermore, in the following embodiments, the components (including operation steps and the like) are not necessarily essential except when explicitly stated and when it is clearly considered to be essential in principle. Similarly, in the following embodiments, when the shape, positional relationship, etc. of the components or the like are referred to, the shape is substantially the same, except when it is clearly stated or when it is considered that it is not clearly the case in principle. Etc., etc. shall be included. This also applies to the above numbers and the like (including the number, numerical values, quantities, ranges and the like).

<Examination of related technologies>
In order to be able to identify the location of the victim in the event of a disaster, a method of transmitting information including location information from the victim's wireless terminal to another person's wireless terminal via a wireless base station can be considered. In addition, the GPS (Global Positioning System) function mounted on the victim's wireless terminal can be used to identify the victim's whereabouts.

However, if the communication between the wireless base station and the core network or the Internet network is cut off due to a disaster or the like, the victim cannot send the location by telephone or e-mail. It is also assumed that the wireless terminal is out of charge and the power is turned off. In such cases, even if the method of specifying the location information between the wireless terminals of the victim and the rescuer is adopted, the location of the victim cannot be identified and the rescuer may not be notified.

As described above, Patent Documents 1 and 2 do not disclose a mechanism for actively using a base station in the event of a disaster to identify the location of a victim. On the other hand, Patent Document 3 discloses a technique in which a server can store a movement history of a communication terminal, which is composed of location information and time information, and can refer to the movement history upon request from another communication terminal. Further, Patent Document 4 describes a method of specifying whether or not a victim is present in a communication area of a radio base station at a predetermined time.

However, in the technique disclosed in Patent Document 3, a server other than the base station apparatus stores the movement history. Therefore, if the communication of the Internet network is cut off due to a disaster or the like, the movement history cannot be saved. Further, according to Patent Document 4, it is possible to grasp whether or not the mobile terminal is located in the communication area of the base station, but it is not possible to grasp the specific position.

When the power of the victim's wireless terminal is turned off, it is difficult to identify the victim's whereabouts. Further, even when it is difficult for the victim to acquire the position information by GPS such as in the rubble or in the underground space, it is similarly difficult to specify the location of the victim.

Therefore, in the following embodiment, the above problem can be solved by positively utilizing the movement information of the wireless terminal in the communication area possessed by the wireless base station in the event of a disaster.

<Embodiment 1>
A configuration example of the base station apparatus 101 according to the first embodiment will be described with reference to FIG. FIG. 1 is a schematic configuration diagram of the base station device 101 of the present embodiment. The base station device 101 of FIG. 1 includes an acquisition unit 102, a storage unit 103, a connection control unit 104, and a provision unit 105. The base station device 101 wirelessly communicates with the first and second wireless terminals in the communication area. For example, the first wireless terminal is a wireless terminal possessed by the disaster victim, and the second wireless terminal is a wireless terminal possessed by the rescuer.

The acquisition unit 102 acquires the position information of the first wireless terminal transmitted from the first wireless terminal. The storage unit 103 stores the position information of the first wireless terminal acquired by the acquisition unit 102. If the connection control unit 104 cannot connect to the core network, the connection control unit 104 establishes a temporary communication connection with the second wireless terminal. The providing unit 105 provides the position information stored in the storage unit 103 to the second wireless terminal via the temporary communication connection established by the connection control unit 104.

Further, when the connection control unit 104 cannot connect to the core network, the connection control unit 104 establishes a temporary communication connection with the first wireless terminal, and the acquisition unit 102 acquires the position information via the established temporary communication connection. You may. The storage unit 103 may store the acquisition time for acquiring the location information together with the location information, and the providing unit 105 may provide the location information and the acquisition time to the second wireless terminal.

As described above, in the present embodiment, the base station apparatus 101 acquires and stores the position information of the first wireless terminal from, for example, the first wireless terminal possessed by the disaster victim. Further, when the connection to the core network cannot be established, a temporary communication connection is established with the second wireless terminal, and the rescuer possesses the position information stored in the storage unit 103 via the established temporary communication connection. Provide to the second wireless terminal. As a result, when the communication between the base station device 101 and the core network (Internet network) is disconnected due to the occurrence of a disaster or the like, the base station device 101 can be used to provide the position information of the first wireless terminal. .. Then, it becomes possible to grasp the position of the victim who possesses the first wireless terminal.

<Embodiment 2>
A configuration example of the wireless communication system 1 according to the second embodiment will be described with reference to FIG. FIG. 2 is a schematic configuration diagram of the wireless communication system 1 of the present embodiment. The wireless communication system 1 of FIG. 2 includes a wireless base station 10, a victim's wireless terminal 21, a rescuer's wireless terminal 22, a core network / Internet network 30, and a GPS satellite 40. The core network / Internet network 30 includes a core network that constitutes a mobile communication network for a wireless terminal together with a radio base station 10, and an Internet network that is connected to the mobile communication network. For example, the radio base station 10 is connected to the Internet network via the core network. The GPS satellite 40 transmits a GPS signal for position measurement to the wireless terminal 21.

The radio base station 10 includes a base station device 101. In the present embodiment, the base station device 101 is installed indoors such as in a station building or a shelter. Further, the base station device 101 may be installed in a place similar to indoors, such as being attached to the outer wall surface of a building.

The base station device 101 includes a storage unit 103, a connection control unit 104, a radio wave transmission / reception unit 106, a clock unit 107, and a core communication unit 108. The base station device 101 is configured to be able to communicate with the victim's wireless terminal 21 and the rescuer's wireless terminal 22. The base station device 101 is configured to be able to communicate with one or a plurality of victim's wireless terminals 21 and rescuer's wireless terminals 22, respectively. Further, the base station apparatus 101 is configured to be able to communicate with the core network / Internet network 30. In the present embodiment, the base station apparatus 101 will be described as being configured to be communicable with the core network / Internet network 30 at least when it is not a disaster (hereinafter referred to as "normal time").

The victim's wireless terminal 21 and the rescuer's wireless terminal 22 are mobile terminal devices having communication functions such as mobile phones, smartphones, tablets, smart watches, and laptop computers. Further, it may be a wearable device having a communication function. That is, the victim's wireless terminal 21 and the rescuer's wireless terminal 22 may be any device that has a communication function and can be carried by the user. Further, the disaster victim's wireless terminal 21 and the rescuer's wireless terminal 22 can be provided with an operation unit such as a button or a touch panel that can be operated by the user.

Further, the victim's wireless terminal 21 and the rescuer's wireless terminal 22 are configured to be able to communicate with the base station device 101. The content of the communication includes location information. The victim's wireless terminal 21 and the rescuer's wireless terminal 22 may be one or a plurality of each.

The victim's wireless terminal 21 includes a GPS receiving unit 211 that receives GPS signals from the GPS satellite 40, and a notification unit 212 that notifies (transmits) movement information to the base station device 101. The GPS receiving unit 211 identifies (generates) the position (latitude, longitude) of the own device and the time existing at that position based on the received GPS signal and time information. The GPS receiving unit 211 is an example of a configuration that realizes a positioning function. Therefore, the position information of the own machine may be acquired by using a positioning means other than GPS.

The notification unit 212 constantly (regularly) transmits the movement information to the base station device 101 to the base station device 101. For example, the notification unit 212 transmits the movement information including the position information and the time information (acquisition time), but may transmit only the position information. As the transmission means to the base station device 101 by the victim's wireless terminal 21, not only the wireless communication means but also the wired communication means via the Internet network 30 via the wireless LAN or the like may be used.

The victim's wireless terminal 21 stores the movement information of the victim's wireless terminal 21 in the storage unit (not shown) of the own terminal in case the movement information cannot be transmitted due to some trouble such as a device failure or a communication failure. It may have a function of collectively transmitting movement information after recovering from the above-mentioned failure.

The rescuer's wireless terminal 22 includes a request unit 221, an acquisition unit 222, and a display unit 223. The requesting unit 221 requests the base station device 101 for the movement information of the victim's wireless terminal 21. The acquisition unit 222 acquires the movement information of the victim's wireless terminal 21 from the requested base station device 101. The display unit 223 displays the movement information acquired from the base station device 101 on a display device such as a liquid crystal display. For example, the display unit 223 may display a map of the vicinity of the base station apparatus 101 together with the acquired movement information. The map information may be acquired from the base station device 101, or may be stored in advance by the wireless terminal 22. Further, the display unit 223 may extract the latest position information of the wireless terminal 21 based on the provided position information and display the extracted position information. The display unit 223 may extract a place where the position information is concentrated based on the provided position information and display the position information including the extracted place.

The victim's wireless terminal 21 constantly acquires information on the current position from the GPS satellite 40 and notifies the wireless base station 10 without operating the terminal. The rescuer acquires the movement information of all the victims' wireless terminals 21 in the communication area from the wireless base station 10 by using the rescuer's wireless terminal 22. This makes it possible to identify when and where the victims were.

Here, the base station apparatus 101, which is a feature of the present disclosure, will be described in detail below. As described above, the base station device 101 includes a storage unit 103, a connection control unit 104, a radio wave transmission / reception unit 106, a clock unit 107, and a core communication unit 108. The base station apparatus 101 uses, for example, LTE (Long Term Evolution) as a wireless communication method to perform wireless communication with a wireless terminal 21 or 22 in a communication area, but the present invention is not limited to this. The core communication unit 108 is a communication unit that communicates with the core network / Internet network 30. For example, in the case of LTE, the core network includes EPC (Evolved Packet Core) and the like. In normal times, the wireless terminal 21 or 22 transmits and receives control signals to and from the server of the core network via the base station apparatus 101 (core communication unit 108) according to the LTE communication standard. As a result, a communication connection (communication session) can be established with the other party's wireless terminal 21 or 22 or the Internet network, and communication can be performed via the established communication connection.

However, when the core communication unit 108 cannot connect to the core network / Internet network 30 due to the occurrence of a disaster or the like, the wireless terminal 21 or 22 cannot establish a communication connection and perform communication. Therefore, the connection control unit 104 enables communication between the wireless terminal 21 or 22 and the base station device 101 when the core communication unit 108 cannot connect to the core network / Internet network 30 (when a communication failure is detected). .. For example, the connection control unit 104 transmits temporary connection information (authentication information required for communication connection, etc.) to the wireless terminal 21 or 22, and the wireless terminal 21 or 22 is used for temporary connection when performing communication. Send information. The connection control unit 104 establishes a temporary communication connection with the wireless terminal 21 or 22 according to the received temporary connection information. The wireless terminal 21 or 22 can communicate with the base station apparatus 101 via the established temporary communication connection.

The radio wave transmission / reception unit 106 is a transmission / reception unit that transmits / receives radio waves to / from the wireless terminals 21 and 22 in the communication area, and includes the acquisition unit 102 and the provision unit 105 in the first embodiment. The radio wave transmission / reception unit 106 acquires the movement information of the disaster victim's wireless terminal 21 that is constantly (regularly) transmitted from the disaster victim's wireless terminal 21. For example, in the event of a disaster, the notification unit 212 of the wireless terminal 21 transmits the movement information and the radio wave transmission / reception unit 106 transmits the movement information via a temporary communication connection established between the wireless terminal 21 and the base station device 101. Receive. In normal times, mobile information may be transmitted and received via a normal communication connection. The radio wave transmission / reception unit 106 can acquire the movement information from the wireless terminals 21 of a plurality of disaster victims. The acquired movement information is stored in the storage unit 103.

The clock unit 107 is a clock function (time generation unit) that generates time information (time). The clock unit 107 can generate the acquisition time for acquiring the movement information. For example, the movement information of the victim's wireless terminal 21 may be generated by acquiring only the position information from the victim's wireless terminal 21 and generating the acquisition time by the clock unit 107 inside the base station device 101. ..

In addition, the radio wave transmission / reception unit 106 receives a request for acquisition of movement information of the victim's wireless terminal 21 from the rescuer's wireless terminal 22. In response to the acquisition request, the movement information of the victim's wireless terminal 21 is acquired from the storage unit 103. Then, the radio wave transmission / reception unit 106 transmits the movement information to the rescuer's wireless terminal 22. In the event of a disaster, the request unit 221 of the wireless terminal 22 transmits an acquisition request via a temporary communication connection established between the wireless terminal 22 and the base station device 101, and the radio wave transmission / reception unit 106 further transmits the wireless terminal 22. Provide movement information to. For example, the wireless terminal 22 requests the position information of all the wireless terminals 21 in the communication area of the base station device 101, and the base station device 101 provides all the position information stored in the storage unit 103 to the wireless terminal 22. do. The acquisition request for the movement information may be limited to the acquisition period in the form of "when to acquire the movement information". This limitation may be set by the rescuer's wireless terminal 22 or by the radio wave transmission / reception unit 106.

The storage unit 103 can include a non-volatile memory (for example, ROM (Read Only Memory)) in which various programs and various data required for processing are fixedly stored. Further, the storage unit 103 can include a volatile memory (for example, RAM (Random Access Memory)) used as a work area. The above program may be read from a portable recording medium such as an optical disk or a semiconductor memory, or may be downloaded from a server device on a network.

The storage unit 103 stores the movement information (time-series movement history) of the victim's wireless terminal 21 acquired by the radio wave transmission / reception unit 106. The storage unit 103 holds a state in which the already acquired movement information is stored even in a state where communication with the victim's wireless terminal 21 cannot be performed. Further, the rescuer's wireless terminal 22 acquires the movement information of the disaster victim's wireless terminal 21 from the storage unit 103 via the radio wave transmission / reception unit 106. The storage unit 103 can store the movement information of the wireless terminals 21 of a plurality of victims.

The storage unit 103 stores at least device information related to the victim's wireless terminal 21 and mobile information in association with each other. The device information about the victim's wireless terminal 21 is the information of the wireless terminal 21 belonging to the communication area formed by the base station device 101. The device information may be any information such as the serial number, MAC (Media Access Control) address, and telephone number of the wireless terminal 21 that can identify the device.

The device information and mobile information about the disaster victim's wireless terminal 21 stored in the storage unit 103 may be shared with the base station device 101 of the wireless base station 10 constituting another communication area. The sharing method may be read by another base station device 10 using a portable recording medium such as an optical disk or a semiconductor memory, or may be a wired or wireless communication means between the base station devices 101. .. By sharing the information, the present disclosure can be applied even when the disaster victim moves across the communication area of the base station device 101.

Further, the storage unit 103 may store map information around the base station device 101. For example, the radio wave transmission / reception unit 106 may provide the map information around the base station device 101 to the wireless terminal 22 together with the acquired movement information.

Further, the base station device 101 may be provided with a function of receiving a weather warning. In addition to meteorological warnings, it also includes, but is not limited to, earthquake, tsunami, volcano, and ocean warnings. At this time, the storage unit 103 may store the device information and the movement information after receiving the weather warning.

The base station device 101 is not shown, and can be realized by operating a general-purpose computer equipped with a control device such as a CPU with a program in which the disaster victim position information notification process according to the present embodiment is implemented. be.

<Operation of each device in the second embodiment>
Here, the operation of each device in this embodiment will be described. In this description, it is assumed that the victim's wireless terminal 21 and wireless base station 10 are located in the disaster area and the core network / Internet network 30 cannot be used unlike normal times. Therefore, the base station apparatus 101 cannot communicate with the outside using the core network / Internet network 30.

As described above, the acquisition unit 102 of the base station apparatus 101 acquires the position information of the disaster victim's wireless terminal 21 transmitted from the notification unit 212 of the disaster victim's wireless terminal 21. The storage unit 103 of the base station device 101 stores the position information of the victim's wireless terminal 21 acquired by the acquisition unit 102. Since the connection control unit 104 cannot connect to the core network, it establishes a temporary communication connection with the rescuer's wireless terminal 22. The providing unit 105 provides the position information stored in the storage unit 103 to the rescuer's wireless terminal 22 via the temporary communication connection established by the connection control unit 104.

The flow of information of the disaster victim's wireless terminal 21, the rescuer's wireless terminal 22, and the base station device 101 will be described with reference to FIG. FIG. 3 is a diagram of a connection sequence of the victim's wireless terminal 21, the rescuer's wireless terminal 22, and the base station device 101. As described above, the victim's wireless terminal 21 constantly transmits the movement information of its own device to the base station device 101 (501). The transmitted mobile information is stored in the storage unit 103 of the base station device 101.

The rescuer's wireless terminal 22 acquires the movement information of the victim's wireless terminal 21 from the storage unit 103 of the base station device 101 via the radio wave transmission / reception unit 106 even if the power of the victim's wireless terminal 21 is turned off. can. The requesting unit 221 of the rescuer's wireless terminal 22 requests the base station device 101 to acquire the mobile information of the victim's wireless terminal 21 (502). The base station device 101 transmits the movement information of the victim's wireless terminal 21 stored in the storage unit 103 to the rescuer's wireless terminal 22 via the radio wave transmission / reception unit 106 (503).

The rescuer can acquire the movement information of the wireless terminals 21 of a plurality of victims. This is because, as described above, the radio wave transmission / reception unit 106 and the storage unit 103 of the base station device 101 can handle the information of the wireless terminals 21 of the plurality of victims. At this time, the display unit 223 of the disaster victim's wireless terminal 21 may display the peripheral map of the base station device 101 together with the acquired movement information. The map information may be acquired from the base station device 101, or may be stored in advance by the wireless terminal 22. Further, the display unit 223 may extract the latest position information of the wireless terminal 21 based on the provided position information and display the extracted position information. The display unit 223 may extract a place where the position information is concentrated based on the provided position information and display the position information including the extracted place.

According to this embodiment, even in a situation where the base station device 101 is not connected to the core network / Internet network 30, it is possible to specify the acquisition time of the mobile information of the wireless terminal 21 of the disaster victim, which contributes to the rescue of the disaster victim.

<Embodiment 3>
This embodiment will be described with reference to FIG. FIG. 4 is a schematic configuration diagram of the wireless communication system 1 according to the second embodiment. In the present embodiment, the mobile base station 20 in which the base station device 101 is mounted on a movable vehicle body such as an automobile is used.

This embodiment assumes a case where there is no environment in which the base station apparatus 101 is installed indoors such as in a station building or a shelter as shown in the first embodiment. Further, it is assumed that the base station apparatus 101 cannot be used due to the damage of the radio base station 10 itself shown in the first embodiment and the inability to receive power.

The wireless communication system 1 of FIG. 4 has a mobile base station 20, a victim's wireless terminal 21, and a rescuer's wireless terminal 22. Further, the disaster victim's wireless terminal 21 has a function of receiving a GPS signal as in the second embodiment. Further, although the configuration is not shown, the base station apparatus 101 includes a radio wave transmission / reception unit 106 and a storage unit 103 as in the second embodiment.

The details of the configuration and the like of the victim's wireless terminal 21, the rescuer's wireless terminal 22, and the base station device 101 are the same as in the case of the second embodiment, and thus the description thereof will be omitted.

When the mobile base station 20 is used, mobile information can be acquired without the fixed radio base station 10, so that the scope of application of the present disclosure is expanded.

Further, instead of the mobile base station 20, the base station device 101 can be simply used as a portable device in a form that exhibits its function at any place. When the base station device 101 is used as a portable device, the base station device 101 can be used even in a place where a vehicle body such as an automobile cannot pass or enter due to a disaster situation. In addition, it is easy to change the installation location. Further, it becomes possible to specify the acquisition time of the movement information of the wireless terminal 21 of the disaster victim in a wider range.

Further, the base station device 101 according to the present embodiment can be mounted on a ship or an air vehicle. Examples of the flying object include, but are not limited to, a drone. By forming a communication area on the ground, the base station device 101 mounted on the aircraft can communicate with the victim terminal in the communication area. Further, the base station device 101 is mounted on the flying object and can acquire the movement information of the radio terminal 21 of the disaster victim even in the state of being present in the air. Further, in response to the request from the rescuer's wireless terminal 22, the movement information of the victim's wireless terminal 21 can be provided to the rescuer's terminal.

By mounting the base station device 101 on a flying object such as a drone, it is possible to acquire the movement information of the victim's wireless terminal 21 from the sky even in a place where a car or a person cannot enter due to the situation of the disaster.

Further, in the installation of the mobile base station 20 as shown in the present embodiment, the work such as wiring work for installing the base station device 101 is reduced. Further, as described above, it becomes possible to acquire the movement information of the victim's wireless terminal 21 in a wider range.

<Embodiment 4>
As a method for extending the power supply time of the victim's wireless terminal 21, there is a method of shifting from the base station device 101 to the disaster victim's wireless terminal 21 in a power saving mode in the event of a disaster. In the present embodiment, the method of shifting to the power saving mode is utilized in combination with the methods of the first and second embodiments.

The power saving mode means a state in which the level of each transmission signal when communicating between the base station device 101 and the radio terminal 21 of the disaster victim is reduced from the level at the time of normal communication. Further, the power saving mode may be referred to as, for example, a sleep mode, a low power consumption mode, or the like.

The operation of the base station device 101 and the victim's wireless terminal 21 in the power saving mode transition method will be described with reference to FIG. FIG. 5 shows a connection sequence at the time of transition to the power saving mode in the present embodiment.

Here, in the present embodiment, in addition to the above-described configuration of the base station apparatus 101, a power saving control unit (not shown) is further provided. The power saving control unit shifts the base station device 101 and the victim's wireless terminal 21 to the power saving mode. The transition to the power saving mode may be set at an arbitrary timing or in advance in the power saving control unit.

The power saving control unit of the base station apparatus 101, which has been in a steady state for continuous transmission / reception, transmits a power saving mode transition instruction to the disaster victim's wireless terminal 21 (601). Upon receiving the power saving mode transition instruction, the disaster victim's wireless terminal 21 immediately transmits a transition instruction confirmation to the base station apparatus 101 (602). The mode is switched to the power saving mode, and the victim's wireless terminal 21 receives the notification information intermittently transmitted from the base station device 101 (603).

The base station device 101 intermittently transmits the broadcast information in the power saving mode. As a result, the base station apparatus 101 does not need to continuously transmit, so that the power consumption can be significantly reduced and the battery drive efficiency in an emergency can be improved. On the other hand, the disaster victim's wireless terminal 21 only performs intermittent reception in accordance with the intermittent transmission timing of the broadcast information of the base station device 101, and stops the reception operation at other times to reduce power consumption.

In order to recover from the power saving mode, the case may be the case according to the instruction (604) from the power saving control unit of the base station apparatus 101, or the case may be the case according to the request from the wireless terminal 21 of the disaster victim.

In forming this power saving mode, one of a plurality of victims' wireless terminals 21 existing in the communication area of the base station apparatus 101 may be targeted, or a plurality of them may be targeted. It may be a thing.

According to the present embodiment, since the base station apparatus 101 stops the transmission other than intermittently transmitting the notification information in the power saving mode, continuous transmission of a large amount of power becomes unnecessary, the power consumption is significantly reduced, and a disaster occurs. The effect of extending the battery operating time of the time can be obtained. Further, even in the reception operation in the power saving mode, the base station apparatus 101 stops the reception operation other than the intermittent reception operation for receiving the system restart request, so that the effect of further power saving can be obtained. .. On the other hand, the wireless terminal 21 of the victim can also be expected to have the effect of saving power by not performing the transmission / reception operation other than the intermittent reception operation in which the timing is adjusted for the intermittent transmission of the broadcast information.

Therefore, according to the present embodiment, it is possible to reduce the power consumption of both the base station device 101 and the victim's wireless terminal 21. Therefore, it is possible to extend the battery operating time until the victim is rescued.

<Other embodiments>
Further, the present disclosure may also take a form as a control method of the base station apparatus 101. As this method, the position information of the first wireless terminal 21 transmitted from the first wireless terminal 21 is acquired, the acquired position information of the first wireless terminal 21 is stored, and the core network 30 is used. A base that establishes a temporary communication connection with the second wireless terminal 22 and provides the stored position information to the second wireless terminal 22 via the established temporary communication connection. This is a control method for the station device 101.

Although the present disclosure has been described as a hardware configuration in the above-described embodiment, the present disclosure is not limited thereto. The present disclosure can also be realized by causing a CPU (Central Processing Unit) to execute a computer program for the processing described in the first embodiment.

In the above example, the program can be stored and supplied to the computer using various types of non-temporary computer-readable media. Non-temporary computer-readable media include various types of tangible recording media. Examples of non-temporary computer-readable media include magnetic recording media (eg, flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg, magneto-optical disks), CD-ROMs, CD-Rs, CD-R / Ws. , Including semiconductor memory (eg, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM). The program may also be supplied to the computer by various types of temporary computer-readable media. Examples of temporary computer readable media include electrical, optical, and electromagnetic waves. The temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.

The program acquires the position information of the first wireless terminal 21 transmitted from the first wireless terminal 21, stores the acquired position information of the first wireless terminal 21, and stores the core network 30. A process of establishing a temporary communication connection with the second wireless terminal 22 and providing the stored position information to the second wireless terminal 22 via the established temporary communication connection. Is a control program for causing the base station device 101 to execute the above.

Although the embodiments of the present disclosure have been described in detail with reference to the drawings, the specific configuration is not limited to the above, and various design changes are made without departing from the gist of the present disclosure. Etc. are possible.

Some or all of the above embodiments may also be described, but not limited to:
(Appendix 1)
An acquisition unit that acquires the position information of the first wireless terminal transmitted from the first wireless terminal, and
A storage unit that stores the acquired position information of the first wireless terminal, and
If you cannot connect to the core network, the connection control unit that establishes a temporary communication connection with the second wireless terminal,
A providing unit that provides the stored location information to the second wireless terminal via the established temporary communication connection.
A base station device.
(Appendix 2)
When the connection control unit cannot connect to the core network, the connection control unit establishes a temporary communication connection with the first wireless terminal.
The acquisition unit acquires the location information via the established temporary communication connection.
The base station apparatus according to Appendix 1.
(Appendix 3)
The storage unit stores the acquisition time for acquiring the location information together with the location information.
The providing unit provides the location information and the acquisition time to the second wireless terminal.
The base station apparatus according to Appendix 1 or 2.
(Appendix 4)
A time generation unit that generates the acquisition time when the position information is acquired is further provided.
The storage unit stores the generated acquisition time.
The base station apparatus according to Appendix 3.
(Appendix 5)
The acquisition unit acquires the acquisition time from the first wireless terminal and obtains the acquisition time.
The storage unit stores the acquired acquisition time.
The base station apparatus according to Appendix 3.
(Appendix 6)
The base station device is
Mounted on a movable body,
Even while moving, the position information of the first wireless terminal is acquired and the position information of the first wireless terminal is provided to the second wireless terminal.
The base station apparatus according to any one of Supplementary Provisions 1 to 5.
(Appendix 7)
The base station device is
Mounted on the aircraft,
Even if it exists in the air, the position information of the first wireless terminal is acquired, and the position information is acquired.
Providing the second wireless terminal with the location information of the first wireless terminal.
The base station apparatus according to any one of Supplementary Provisions 1 to 5.
(Appendix 8)
The base station device is portable.
The base station apparatus according to any one of Supplementary Provisions 1 to 5.
(Appendix 9)
Further, a power saving control unit for shifting the base station device and the first wireless terminal to the power saving mode is provided.
The base station apparatus according to any one of Supplementary Provisions 1 to 8.
(Appendix 10)
The providing unit provides map information around the base station apparatus together with the location information.
The base station apparatus according to any one of Supplementary note 1 to 9.
(Appendix 11)
It is equipped with a first wireless terminal, a second wireless terminal, and a base station device.
The base station device is
An acquisition unit that acquires the position information of the first wireless terminal transmitted from the first wireless terminal, and
A storage unit that stores the acquired position information of the first wireless terminal, and
If the connection to the core network cannot be established, the connection control unit that establishes a temporary communication connection with the second wireless terminal,
A providing unit that provides the stored location information to the second wireless terminal via the established temporary communication connection.
A wireless communication system equipped with.
(Appendix 12)
The first wireless terminal generates the position information based on a GPS (Global Positioning System) signal.
The wireless communication system according to Appendix 11.
(Appendix 13)
The first wireless terminal periodically transmits the location information.
The wireless communication system according to Appendix 11 or 12.
(Appendix 14)
The second wireless terminal displays a map around the base station apparatus together with the provided location information.
The wireless communication system according to any one of Supplementary note 11 to 13.
(Appendix 15)
The second wireless terminal extracts the latest position information of the first wireless terminal based on the provided position information.
The wireless communication system according to any one of Supplementary note 11 to 13.
(Appendix 16)
The second wireless terminal extracts a place where the position information is concentrated based on the provided position information.
The wireless communication system according to any one of Supplementary note 11 to 13.
(Appendix 17)
Acquire the position information of the first wireless terminal transmitted from the first wireless terminal,
The acquired position information of the first wireless terminal is stored, and the position information is stored.
If you cannot connect to the core network, establish a temporary communication connection with the second wireless terminal and
The stored location information is provided to the second wireless terminal via the established temporary communication connection.
How to control the base station equipment.
(Appendix 18)
Acquire the position information of the first wireless terminal transmitted from the first wireless terminal,
The acquired position information of the first wireless terminal is stored, and the position information is stored.
If you cannot connect to the core network, establish a temporary communication connection with the second wireless terminal and
The stored location information is provided to the second wireless terminal via the established temporary communication connection.
A control program that causes the base station equipment to execute processing.

1 Wireless communication system 21, 22 Wireless terminal 30 Core network / Internet network 40 GPS satellite 101 Base station device 102 Acquisition unit 103 Storage unit 104 Connection control unit 105 Providing unit 106 Radio wave transmission / reception unit 107 Clock unit 108 Core communication unit 211 GPS receiving unit 212 Notification unit 221 Request unit 222 Acquisition unit 223 Display unit

Claims (10)

It ’s a base station device,
An acquisition unit that acquires the position information of the first wireless terminal transmitted from the first wireless terminal, and
A storage unit that stores the acquired position information of the first wireless terminal, and
When the base station device cannot connect to the core network, a connection control unit that establishes a temporary communication connection with the second wireless terminal, and
A provider that provides the stored location information to the second wireless terminal in response to a request from the second wireless terminal via the established temporary communication connection.
A base station device. When the connection control unit cannot connect to the core network, the connection control unit establishes a temporary communication connection with the first wireless terminal.
The acquisition unit acquires the location information via the established temporary communication connection.
The base station apparatus according to claim 1. The storage unit stores the acquisition time for acquiring the location information together with the location information.
The providing unit provides the position information and the acquisition time to the second wireless terminal based on the time range requested from the second wireless terminal.
The base station apparatus according to claim 1 or 2. A time generation unit that generates the acquisition time when the position information is acquired is further provided.
The storage unit stores the generated acquisition time.
The base station apparatus according to claim 3. The acquisition unit acquires the acquisition time from the first wireless terminal and obtains the acquisition time.
The storage unit stores the acquired acquisition time.
The base station apparatus according to claim 3. It is equipped with a first wireless terminal, a second wireless terminal, and a base station device.
The base station device is
An acquisition unit that acquires the position information of the first wireless terminal transmitted from the first wireless terminal, and
A storage unit that stores the acquired position information of the first wireless terminal, and
When the base station device cannot connect to the core network, a connection control unit that establishes a temporary communication connection with the second wireless terminal, and
A provider that provides the stored location information to the second wireless terminal in response to a request from the second wireless terminal via the established temporary communication connection.
A wireless communication system equipped with. The first wireless terminal generates the position information based on a GPS (Global Positioning System) signal.
The wireless communication system according to claim 6. The second wireless terminal displays a map around the base station apparatus together with the provided location information.
The wireless communication system according to claim 6 or 7. It is a control method for base station equipment.
Acquire the position information of the first wireless terminal transmitted from the first wireless terminal,
The acquired position information of the first wireless terminal is stored, and the position information is stored.
If the base station device cannot connect to the core network, establish a temporary communication connection with the second wireless terminal and establish a temporary communication connection.
The stored position information is provided to the second wireless terminal in response to a request from the second wireless terminal via the established temporary communication connection.
How to control the base station equipment. It is a control program to be executed by the base station equipment.
Acquire the position information of the first wireless terminal transmitted from the first wireless terminal,
The acquired position information of the first wireless terminal is stored, and the position information is stored.
If the base station device cannot connect to the core network, establish a temporary communication connection with the second wireless terminal and establish a temporary communication connection.
The stored position information is provided to the second wireless terminal in response to a request from the second wireless terminal via the established temporary communication connection.
A control program that causes the base station equipment to execute processing.

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