JP2016092555A - Communication system, communication device, communication method, and communication program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication system, communication device, communication method and communication program that are able to determine whether or not a mobile body such as a cart is left unattended.SOLUTION: A communication device comprises: an acceleration sensor; a determination unit for determining whether or not speed calculated from acceleration detected by the acceleration sensor is less than a first threshold value for a first stipulated time; and a transmission unit for transmitting the determination result when it is determined that the speed is less than the first threshold value for the first stipulated time.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a communication system, a communication device, a communication method, and a communication program.

  In public places such as airports, hospitals, and large shopping centers, luggage carts, etc. left after use are discovered and collected by patrols. For example, a technique for detecting the position, stop, movement, and the like of a cart has been disclosed (see, for example, Patent Document 1).

JP 2012-183899 A

  However, a technique for detecting whether or not the cart is left is not disclosed.

  In one aspect, an object of the present invention is to provide a communication system, a communication apparatus, a communication method, and a communication program that can determine whether or not a mobile object such as a cart is left unattended.

  In one aspect, the communication apparatus includes an acceleration sensor and a determination unit that determines whether or not a speed calculated from the acceleration detected by the acceleration sensor is less than a first threshold value for a first specified time. A transmission unit that transmits the determination result when it is determined that the speed is less than the first threshold for the first specified time.

  In another aspect, the communication system includes an acceleration sensor and a determination unit that determines whether or not a speed calculated from the acceleration detected by the acceleration sensor is less than a first threshold value for a first specified time. A transmission unit that transmits the determination result when the speed is determined to be less than the first threshold for the first specified time, and is transmitted by the transmission unit. A second communication device including an acquisition unit that acquires the determination result.

  In another aspect, the communication system receives a first communication device including an acceleration sensor and a transmission unit that transmits a signal related to acceleration detected by the acceleration sensor, and the signal transmitted from the transmission unit. And a determination unit that determines whether or not the speed calculated from the acceleration detected by the acceleration sensor is less than a specified time and a threshold using the signal received by the reception unit, A second communication device comprising: an output unit that outputs a result of the determination when it is determined that the speed is less than the threshold for the specified time.

  It can be determined whether a moving body such as a cart is left unattended.

1 is a schematic diagram of a communication system according to a first embodiment. (A) is a block diagram showing the whole structure of a communication apparatus, (b) is a block diagram which illustrates the hardware constitutions of a controller, (c) is a functional block diagram. (A) is a block diagram which illustrates the hardware constitutions of a server, (b) is a functional block diagram. It is a flowchart showing an example of operation | movement of a communication apparatus. It is a figure showing the relationship between the detection result of an acceleration sensor, and the signal transmitted from a communication part. It is a flowchart showing an example of operation | movement of a server. It is a figure showing an example of the table stored in the database. It is a flowchart showing an example of operation | movement of a communication apparatus. It is a figure showing the relationship between the detection result of an acceleration sensor, and the signal transmitted from a communication part. It is a flowchart showing an example of operation | movement of a server. It is a figure showing an example of the table stored in the database. It is a flowchart showing an example of operation | movement of a server.

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

  FIG. 1 is a schematic diagram of a communication system 200 according to the first embodiment. As illustrated in FIG. 1, the communication system 200 includes a communication device 100, a plurality of antennas 110, a server 120, and the like. The communication device 100 is attached to a moving body such as a cart 130 disposed in a public place such as an airport, a hospital, or a shopping center. As a result, the communication device 100 moves along with the movement of the cart 130. A plurality of carts 130 to which the communication device 100 is attached may be arranged.

  The communication device 100 is, for example, a wearable device or a beacon. The antennas 110 are receiving devices that are arranged at different positions. For example, the communication device 100 transmits a signal by a wireless method using radio waves. The server 120 acquires a signal received by the antenna 110. In addition, the server 120 transmits a signal to the communication apparatus 100 via the antenna 110 by a wireless method using radio waves.

  FIG. 2A is a block diagram illustrating the overall configuration of the communication apparatus 100. As an example, the communication device 100 includes a power supply 10, a sensor unit 20, a transmission unit 30, a light emitting unit 40, a notification unit 50, a storage unit 60, a controller 70, and the like. As an example, the sensor unit 20 includes an acceleration sensor 21, an illuminance sensor 22, a geomagnetic sensor 23, a temperature sensor 24, an atmospheric pressure sensor 25, and the like.

  The power source 10 is a primary battery, a secondary battery, or the like, and supplies power to each unit. Each sensor of the sensor unit 20 is a sensor that detects information related to the communication device 100. The acceleration sensor 21 outputs a signal corresponding to the acceleration of the communication device 100 to the controller 70. The acceleration here means an acceleration related to the movement of the communication device 100 and does not include a gravitational acceleration in a stationary state. Although the number of axes is not particularly limited, in the present embodiment, the acceleration sensor 21 is a triaxial sensor as an example. The illuminance sensor 22 outputs a signal corresponding to the illuminance around the communication device 100 to the controller 70. The geomagnetic sensor 23 outputs a signal corresponding to the geomagnetism at the position of the communication device 100 to the controller 70. The temperature sensor 24 outputs a signal corresponding to the temperature around the communication device 100 to the controller 70. The atmospheric pressure sensor 25 outputs a signal corresponding to the atmospheric pressure around the communication device 100 to the controller 70.

  The transmission unit 30 is an apparatus including an antenna, for example, and wirelessly transmits detection results corresponding to the output signals of the sensors of the sensor unit 20 in accordance with instructions from the controller 70. In addition, the transmission unit 30 wirelessly receives a signal from the server 120 and outputs the signal to the controller 70. For example, the transmission unit 30 employs a Bluetooth (registered trademark) communication method.

  The light emitting unit 40 is an LED, for example, and emits light according to an instruction from the controller 70. The notification unit 50 is a buzzer, for example, and issues a warning according to an instruction from the controller 70. The storage unit 60 is an FRAM (registered trademark) (Ferroelectric Random Access Memory) or the like. The storage unit 60 stores a detection result corresponding to the output signal of each sensor of the sensor unit 20.

  FIG. 2B is a block diagram illustrating a hardware configuration of the controller 70. As illustrated in FIG. 2B, the controller 70 includes a CPU 101, a RAM 102, a storage device 103, an interface 104, and the like. Each of these devices is connected by a bus or the like.

  A CPU (Central Processing Unit) 101 is a central processing unit. The CPU 101 includes one or more cores. A RAM (Random Access Memory) 102 is a volatile memory that temporarily stores programs executed by the CPU 101, data processed by the CPU 101, and the like. The storage device 103 is a nonvolatile storage device. As the storage device 103, for example, a ROM (Read Only Memory), a solid state drive (SSD) such as a flash memory, a hard disk driven by a hard disk drive, or the like can be used. The storage device 103 stores a program for the communication device 100.

  When the CPU 101 executes the program stored in the storage device 103, the determination unit 71 and the control unit 72 are realized in the controller 70 as illustrated in FIG. The determination unit 71 determines whether or not the speed calculated from the acceleration detected by the acceleration sensor 21 is less than the specified time and the first threshold value. Further, the determination unit 71 determines whether or not the speed calculated from the acceleration detected by the acceleration sensor 21 exceeds a second threshold value equal to or greater than the first threshold value. The control unit 72 controls the transmission unit 30 according to the determination result of the determination unit 71.

  FIG. 3A is a block diagram illustrating the hardware configuration of the server 120. As illustrated in FIG. 3A, the server 120 includes a CPU 201, a RAM 202, a storage device 203, an interface 204, a display device 205, and the like. These devices are connected by a bus or the like. The CPU 201 is a central processing unit including one or more cores. The RAM 202 is a volatile memory that temporarily stores programs executed by the CPU 201, data processed by the CPU 201, and the like. The storage device 203 is a nonvolatile storage device. As the storage device 203, for example, a solid state drive (SSD) such as a ROM or a flash memory, a hard disk driven by a hard disk drive, or the like can be used. The storage device 203 stores a program for the master device. The interface 204 is a device for transmitting and receiving signals to and from the antenna 110. The display device 205 is a device that displays the processing result of the server 120.

  When the CPU 201 executes the program stored in the storage device 203, as illustrated in FIG. 3B, the information acquisition unit 111, the determination unit 112, the database 113, and the control unit 114 are realized. The information acquisition unit 111 acquires information from the transmission signal of the communication device 100. The determination unit 112 determines whether or not the cart 130 is left unattended. The database 113 stores the information acquired by the information acquisition unit 111, the determination result of the determination unit 112, and the like in a table. The control unit 114 controls the display device 205 according to the determination result of the determination unit 112.

  FIG. 4 is a flowchart illustrating an example of the operation of the communication apparatus 100. As illustrated in FIG. 4, the determination unit 71 waits for a certain period (step S1). Next, the determination part 71 acquires the detection result of the acceleration sensor 21 (step S2). Next, the determination unit 71 calculates the speed of the communication device 100 from the detection result acquired in step S2 (step S3).

  Next, the determination unit 71 determines whether or not the speed calculated from the acceleration detected by the acceleration sensor 21 exceeds a second threshold value equal to or greater than the first threshold value (step S4). A value close to zero can be used as the first threshold value. The first threshold value and the second threshold value may be the same value. By executing step S4, it can be determined whether the cart 130 is moving or stopped. When it is determined as “Yes” in step S4, the control unit 72 causes the transmission unit 30 to transmit an identification signal for identifying “moving” (step S5). This identification signal may include the ID of the communication device 100 or the like. Thereafter, step S1 is executed again.

  When it is determined “No” in step S4, the determination unit 71 determines whether or not the acceleration detected by the acceleration sensor 21 is less than the first threshold value for a specified time (step S6). The specified time here is a threshold value for determining whether or not the cart 130 is left unattended, and is preferably a long time such as a minute order or a time order. If it is determined “No” in step S6, step S1 is executed again.

  When it is determined “Yes” in step S6, the determination unit 71 determines whether or not an identification signal for identifying “long-term stop” has been transmitted to the server 120 (step S7). When it determines with "No" at step S7, the control part 72 makes the transmission part 30 transmit the identification signal for identifying "long-term stop" (step S8). This identification signal may include the ID of the communication device 100 or the like. Next, the determination unit 71 determines whether or not a process end condition is satisfied (step S9). If “No” is determined in step S9, the process is executed again from step S1. If it is determined “Yes” in step S7, step S9 is executed. This prevents an identification signal for identifying “long-term stop” from being transmitted a plurality of times.

  FIG. 5 is a diagram illustrating the relationship between the detection result of the acceleration sensor 21 and the identification signal transmitted from the transmission unit 30. In the upper part of FIG. 5, the horizontal axis represents time, and the vertical axis represents acceleration detected by the acceleration sensor 21. In the lower part of FIG. 5, the horizontal axis represents time, and the vertical axis represents the speed calculated from the acceleration. As illustrated in FIG. 5, when the speed exceeds the second threshold, an identification signal for identifying “moving” is transmitted from the transmission unit 30. It should be noted that the identification signal is transmitted at a constant cycle by executing Steps S1 to S4 and Step S5. When the speed becomes less than the first threshold value, the identification signal for identifying “moving” is not transmitted. When the state where the speed is less than the first threshold continues for a specified time, an identification signal for identifying “long-term stop” is transmitted from the transmission unit 30.

  FIG. 6 is a flowchart illustrating an example of the operation of the server 120. As illustrated in FIG. 6, the information acquisition unit 111 waits for reception of a transmission signal from the communication device 100 (step S11). The transmission signal of the communication device 100 includes the identification signal described above. When receiving the transmission signal of the communication device 100 (step S12), the information acquisition unit 111 acquires the time of reception (step S13). The time can be acquired from a timer in the server 120 or the like.

  Next, the information acquisition unit 111 acquires the ID of the communication device 100 and the cart status (moving or during a long-term stop) from the acquired information (step S14). Next, the determination unit 112 identifies the antenna 110 having the maximum received radio wave intensity from the communication device 100 among the plurality of antennas 110 (step S15). Since the position of the antenna 110 is known and the reception area is specified, the determination unit 112 specifies the position or position range of the communication device 100 using the reception result of at least one of the plurality of antennas 110. You can also. For example, a technique such as three-point positioning can be used.

  Next, the determination unit 112 determines whether or not the cart is left unattended according to the identification result of step S15 (step S16). For example, if the position or position range of the communication device 100 is a cart storage area, it can be determined that the cart is not left unattended but is placed in the cart storage area. If the position or position range of the communication device 100 is other than the cart storage area, it can be determined that the cart is left unattended. Note that the determination unit 112 may determine whether to leave the communication device 100 regardless of the position and position range of the communication device 100.

  Next, the determination unit 112 writes the ID of the communication device 100, the cart status, the time, the position or position range, the flag related to neglecting, and the like in the database 113 (step S17). Note that the control unit 114 may control the display device 205 so as to display the position or position range of the cart left unattended. Next, the determination unit 112 determines whether or not a process end condition is satisfied (step S18). If “No” is determined in step S18, the process is executed again from step S11.

  FIG. 7 is a diagram illustrating an example of a table stored in the database 113. As illustrated in FIG. 7, in association with the ID of the communication device 100, a flag related to the cart status, time, position range, and neglect is stored. If the movement / long stop flag is “0”, it means that the “moving” identification signal is transmitted, and if the movement / long stop flag is “1”, the “long-term stop” identification signal is Means sent. Further, if the neglect flag is “0”, it means that it is determined not to be neglected, and if the neglect flag is “1”, it means that it is determined to be neglect. In the example of FIG. 7, since the area K is a cart storage area, even if an identification signal for identifying “long-term stop” is transmitted in the area K, it is not determined to be left unattended. On the other hand, when an identification signal for identifying “long-term stop” is transmitted in the area C outside the cart storage area, it is determined to be left unattended.

  According to the present embodiment, when it is determined that the speed calculated from the acceleration detected by the acceleration sensor 21 is less than the specified time and the threshold value, an identification signal of the determination result is transmitted wirelessly. According to this configuration, it is possible to determine whether or not a mobile object such as a cart to which the communication device 100 is attached is temporarily stopped, and whether or not it is left unattended.

  Although a technique for determining whether a moving body such as a cart has been stopped for a long time using GPS or the like can be considered, GPS is difficult to use indoors. Even when used outdoors, it is necessary to always or periodically check the position of the moving body in the determination using GPS. On the other hand, in the present embodiment, since the identification signal is only transmitted when the speed calculated from the acceleration detected by the acceleration sensor 21 is less than the specified time threshold, the configuration is simple, This is also advantageous in terms of power consumption.

  Further, the reception intensity of the transmission signal from the communication device 100 can be detected using the antenna 110. Since the position of the antenna 110 is known, the position of the communication device 100 can be detected. Further, if the position of the communication device 100 can be detected, it can be determined whether the position is a regular place or left. In addition, since the identification signal for identifying “moving” is transmitted from the communication device 100, the movement history of the communication device 100 can be collected.

  In the first embodiment, the communication apparatus 100 transmits an identification signal for identifying “moving”, but an identification signal for identifying “pause” may be transmitted. In the second embodiment, an example in which an identification signal for identifying “pause” is transmitted instead of an identification signal for identifying “moving” will be described. The apparatus configuration is the same as that of the first embodiment.

  FIG. 8 is a flowchart illustrating an example of the operation of the communication apparatus 100. As illustrated in FIG. 8, the determination unit 71 waits for a predetermined period (step S21). Next, the determination part 71 acquires the detection result of the acceleration sensor 21 (step S22). Next, the determination unit 71 calculates the moving speed of the communication device 100 from the detection result acquired in step S22 (step S23).

  Next, the determination unit 71 determines whether or not the speed calculated from the acceleration detected by the acceleration sensor 21 exceeds a second threshold value equal to or greater than the first threshold value (step S24). A value close to zero can be used as the first threshold value. By executing step S24, it can be determined whether the cart 130 is moving or stopped. If it is determined “Yes” in step S24, step S21 is executed again.

  When it is determined as “No” in Step S24, the determination unit 71 determines whether or not the acceleration detected by the acceleration sensor 21 is equal to or longer than the specified time T1 and less than the first threshold (Step S25). The specified time T1 is a threshold value for determining whether or not the cart is left unattended, and thus is set to a long time such as a minute order or a time order. When it is determined “Yes” in step S25, the determination unit 71 determines whether or not an identification signal for identifying “long-term stop” has been transmitted to the server 120 (step S26). When it determines with "No" at step S26, the control part 72 makes the transmission part 30 transmit the identification signal for identifying "long-term stop" (step S27). Next, the determination unit 71 determines whether or not a process end condition is satisfied (step S28). If "No" is determined in step S28, the process is executed again from step S21. Even when “Yes” is determined in step S26, step S28 is executed. This prevents an identification signal for identifying “long-term stop” from being transmitted a plurality of times.

  When it is determined “No” in step S25, the determination unit 71 determines whether or not the speed calculated from the acceleration detected by the acceleration sensor 21 is equal to or longer than the specified time T2 and less than the first threshold ( Step S29). The specified time T2 is a threshold value for determining whether or not the cart is temporarily stopped instead of being left unattended, and is a value (for example, 2 to 3 seconds) smaller than the specified time T1. If “No” is determined in step S29, the cart is moving, so step S21 is executed again.

  When it is determined as “Yes” in step S29, the determination unit 71 determines whether or not an identification signal for identifying “pause” has been transmitted to the server 120 (step S30). When it determines with "No" at step S30, the control part 72 makes the transmission part 30 transmit the identification signal for identifying "pause" (step S31). Thereafter, step S28 is executed. Further, even when “Yes” is determined in step S30, step S28 is executed.

  FIG. 9 is a diagram illustrating the relationship between the detection result of the acceleration sensor 21 and the identification signal transmitted from the transmission unit 30. In the upper part of FIG. 9, the horizontal axis represents time, and the vertical axis represents acceleration detected by the acceleration sensor 21. In the lower part of FIG. 9, the horizontal axis represents time, and the vertical axis represents the speed calculated from the acceleration. As illustrated in FIG. 9, when the cart is moving, an identification signal for identifying “temporary stop” or “long-term stop” is not transmitted from the transmission unit 30. When the cart is temporarily stopped, an identification signal for identifying “pause” is transmitted from the transmission unit 30. When the cart is stopped for a long time, an identification signal for identifying “long-term stop” is transmitted from the transmission unit 30.

  FIG. 10 is a flowchart illustrating an example of the operation of the server 120. The flowchart of FIG. 10 differs from the flowchart of FIG. 6 in that step S14 ′ is executed instead of step S14. In step S14 ′, the information acquisition unit 111 acquires the ID of the communication device 100 and the cart status (temporarily stopped or in a long-term stop) from the information acquired in step S13.

  FIG. 11 is a diagram illustrating an example of a table stored in the database 113. As illustrated in FIG. 11, in association with the ID of the communication apparatus 100, a flag related to the cart status, time, position range, and neglect is stored. If the temporary stop / long stop flag is “0”, it means that an identification signal of “temporary stop” has been transmitted, and if the temporary stop / long stop flag is “1”, identification of “long-term stop” Means that a signal has been sent. Further, if the neglect flag is “0”, it means that it is determined not to be neglected, and if the neglect flag is “1”, it means that it is determined to be neglect. In the example of FIG. 11, even if the cart is temporarily stopped, it is not determined to be left unattended. Since area K is a cart storage area, even if an identification signal for identifying “long-term stop” is transmitted in area K, it is not determined to be left unattended. On the other hand, when an identification signal for identifying “long-term stop” is transmitted in the area F outside the cart storage area, it is determined to be left unattended.

  According to the present embodiment, when it is determined that the speed calculated from the acceleration detected by the acceleration sensor 21 is less than the specified time and the threshold value, an identification signal of the determination result is transmitted. According to this configuration, it is possible to determine whether or not a mobile object such as a cart to which the communication device 100 is attached is temporarily stopped, and whether or not it is left unattended.

  Further, the reception intensity of the transmission signal from the communication device 100 can be detected using the antenna 110. Since the position of the antenna 110 is known, the position of the communication device 100 can be detected. Further, if the position of the communication device 100 can be detected, it can be determined whether the position is a regular place or left. In addition, since an identification signal for identifying “pause” is transmitted from the communication device 100, a history of the stop position of the communication device 100 can be collected.

  In the first embodiment and the second embodiment, the communication apparatus 100 performs the determination related to “long-term stop”, but is not limited thereto. For example, using the detection result of the acceleration sensor 21 transmitted from the communication device 100, the server 120 may make a determination regarding “long-term stop” of the communication device 100. In the third embodiment, an example will be described in which the server 120 performs determination related to “long-term stop” of the communication device 100.

  In the present embodiment, in the communication device 100, the control unit 72 causes the transmission unit 30 to transmit a signal corresponding to the acceleration detected by the acceleration sensor 21 at all times or periodically. This signal may include the ID of the communication device 100 or the like.

  FIG. 12 is a flowchart illustrating an example of the operation of the server 120. As illustrated in FIG. 12, the information acquisition unit 111 acquires the ID, speed, and the like of the communication device 100 from the transmission signal received from the communication device 100 (step S41). When a signal is periodically transmitted from the transmission unit 30, the information acquisition unit 111 sequentially acquires the ID, speed, and the like of the communication device 100 from the signal.

  Next, the determination unit 112 determines whether or not there is a period in which the acceleration acquired in step S41 is less than a specified time and a threshold value (step S42). If “No” is determined in step S42, the process is executed again from step S41. When it is determined as “Yes” in step S42, the information acquisition unit 111 acquires time information of the period, ID of the communication device 100, and the like (step S43).

  Next, the determination unit 112 specifies the antenna 110 having the maximum received radio wave intensity from the communication device 100 among the plurality of antennas 110 during the period (step S44). Thereby, the position range of the communication apparatus 100 can be specified. Alternatively, the determination unit 112 can specify the position or position range of the communication device 100 using the reception result of at least one of the plurality of antennas 110. For example, a technique such as three-point positioning can be used.

  Next, the determination unit 112 determines whether or not the cart is left unattended according to the identification result of step S44 (step S45). For example, if the position or position range of the communication device 100 is a cart storage area, it can be determined that the cart is not left unattended but is placed in the cart storage area. If the position or position range of the communication device 100 is other than the cart storage area, it can be determined that the cart is left unattended.

  Next, the determination unit 112 writes the ID of the communication apparatus 100, a period during which the acceleration is less than the threshold, a position or position range, a flag regarding neglect, and the like in the database 113 (step S46). Note that the control unit 114 may control the display device 205 so as to display the position or position range of the cart left unattended. Next, the determination unit 112 determines whether or not a process end condition is satisfied (step S47). If “No” is determined in step S47, the process is executed again from step S41.

  According to the present embodiment, when it is determined that the speed calculated from the acceleration detected by the acceleration sensor 21 is less than the specified time and the threshold value, the server 120 leaves the target communication device 100 unattended. Can be determined. Also in the present embodiment, as in the first or second embodiment, it may be determined whether the communication device 100 is “moving”, “pause”, or the like according to a signal transmitted by the communication device 100. .

  In each of the above examples, the “moving”, “long-term stop”, and “pause” identification signals may be signals including identification information, but are not limited thereto. For example, “moving”, “long-term stop”, “temporary stop”, and the like may be distinguished by changing the transmission cycle of a periodically transmitted signal. In each of the above examples, the communication device 100 functions as an example of a first communication device, and the antenna 110 and the server 120 function as an example of a second communication device. Further, the determination unit 112 functions as an example of a specifying unit that specifies the position or position range of the first communication device.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims. It can be changed.

DESCRIPTION OF SYMBOLS 10 Power supply 20 Sensor part 30 Transmission part 40 Light emission part 50 Notification part 60 Storage part 70 Controller 100 Communication apparatus 110 Antenna 111 Information acquisition part 112 Judgment part 113 Database 114 Control part 120 Server 130 Cart 200 Communication system

When it is determined as “No” in Step S4, the determination unit 71 determines whether or not the speed calculated from the acceleration detected by the acceleration sensor 21 is less than the specified time and the first threshold value (Step S6). ). The specified time here is a threshold value for determining whether or not the cart 130 is left unattended, and is preferably a long time such as a minute order or a time order. If it is determined “No” in step S6, step S1 is executed again.

When it is determined as “No” in step S24, the determination unit 71 determines whether or not the speed calculated from the acceleration detected by the acceleration sensor 21 is equal to or longer than the specified time T1 and less than the first threshold ( Step S25). The specified time T1 is a threshold value for determining whether or not the cart is left unattended, and thus is set to a long time such as a minute order or a time order. When it is determined “Yes” in step S25, the determination unit 71 determines whether or not an identification signal for identifying “long-term stop” has been transmitted to the server 120 (step S26). When it determines with "No" at step S26, the control part 72 makes the transmission part 30 transmit the identification signal for identifying "long-term stop" (step S27). Next, the determination unit 71 determines whether or not a process end condition is satisfied (step S28). If "No" is determined in step S28, the process is executed again from step S21. Even when “Yes” is determined in step S26, step S28 is executed. This prevents an identification signal for identifying “long-term stop” from being transmitted a plurality of times.

Claims (9)

An acceleration sensor;
A determination unit that determines whether or not a speed calculated from an acceleration detected by the acceleration sensor is less than a first specified time and a first threshold;
And a transmission unit that transmits the determination result when it is determined that the speed is less than the first threshold for the first specified time. The determination unit determines whether the speed exceeds a second threshold value equal to or greater than the first threshold value;
The communication apparatus according to claim 1, wherein the transmission unit transmits the determination result when it is determined that the speed exceeds the second threshold value. The determination unit determines whether or not the speed is less than the first threshold for a second specified time shorter than the first specified time,
The communication device according to claim 1, wherein the transmission unit transmits the determination result when it is determined that the speed is less than the first threshold value for the second specified time. An acceleration sensor; a determination unit that determines whether or not a speed calculated from the acceleration detected by the acceleration sensor is less than a first specified time and a first threshold; and the speed is the first specified time A first communication device comprising: a transmission unit that transmits the determination result when it is determined to be less than the first threshold;
A communication system comprising: a second communication device including an acquisition unit that acquires the determination result transmitted by the transmission unit. The transmitter transmits the determination result wirelessly,
The second communication device includes one or more reception devices that wirelessly receive a determination result transmitted by the transmission unit,
The acquisition unit acquires the determination result from the one or more receiving devices,
The said 2nd communication apparatus is provided with the specific | specification part which pinpoints the position or position range of a said 1st communication apparatus according to the reception intensity | strength of at least any one of said 1 or more receiving apparatuses. The communication system described. Detecting an acceleration of the communication device using an acceleration sensor included in the communication device;
Determining whether the speed calculated from the acceleration is less than a first threshold for a first specified time;
When it is determined that the speed is less than the first threshold for the first specified time, the determination result is transmitted. On the computer,
A process of detecting an acceleration of the communication device according to a detection result of an acceleration sensor included in the communication device, and calculating a speed from the acceleration;
A process for determining whether the acceleration is less than a first threshold value for a first specified time;
And a process of transmitting the determination result when the speed is determined to be less than the first threshold for the first specified time. Detecting an acceleration of the first communication device using an acceleration sensor included in the first communication device, calculating a speed from the acceleration,
Determining whether the speed is less than a first threshold for a first specified time;
When it is determined that the speed is less than the first threshold for the first specified time, the determination result is transmitted,
A communication method, wherein the transmitted determination result is acquired by a second communication device. A first communication device comprising: an acceleration sensor; and a transmission unit that transmits a signal related to acceleration detected by the acceleration sensor;
The receiving device that receives the signal transmitted from the transmitting unit, and the velocity calculated from the acceleration detected by the acceleration sensor using the signal received by the receiving device is less than a specified time and a threshold value. A second communication device comprising: a determination unit that determines whether or not the speed is less than the specified time and the threshold and outputs a determination result when the speed is determined to be less than the threshold value. A communication system characterized by the above.

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