JP2021044839A - Mobile communication device and operation control system - Google Patents

Abstract

To provide a mobile communication device capable of achieving real-time and reliability of information passing, and also to provide an operation control system.SOLUTION: An operation control system is constructed by a mobile communication device 11 loaded on a vehicle 20, and a management server installed in an office or the like. The mobile communication device 11 includes: an information input part 30 into which information is inputted; a storage part 41 for storing information inputted into the information input part 30; a communication part 50 capable of transmitting the information stored in the storage part 41 using an UDP communication in at least a first band and a second band different from the first band in a frequency band; and a control part 40 which selects the better band in a communication state out of the first band and the second band and transmits the latest information stored in the storage part 41 to the communication part 50.SELECTED DRAWING: Figure 2

Description

The present invention relates to a mobile communication device mounted on a mobile body such as a vehicle or an aircraft, and an operation management system.

There is an operation management system that manages the operation of a vehicle (see, for example, Patent Document 1). The operation management system is constructed by a mobile communication device mounted on the vehicle and a management server. The mobile communication device is, for example, a digital tachograph having a communication function. The management server manages the operation of the vehicle based on the operation information transmitted by the mobile communication device.

In the operation management system, for example, TCP (Transmission Control Protocol) communication is used for communication with the mobile body.

Japanese Unexamined Patent Publication No. 2016-151835

By using TCP communication, operation information can be reliably passed from the vehicle to the management server. However, in TCP communication, it may take time to transfer information, and there is a problem that there is no real-time property.

Specifically, in TCP communication, when a communication failure occurs and the server cannot receive information, it waits until a predetermined time elapses, then sends a negative response, and then retransmits the information (retry). )repeat. As a result, it may take time to transfer information.

Further, in TCP communication, a time weight is provided at the time of reconnection. Due to this time weight, it takes time to transfer information.

Further, in TCP communication, the load on the management server may suddenly increase due to the retry immediately after the communication failure is recovered, and the server may go down.

The inventors of the present application have attempted to use UDP (User Datagram Protocol) communication in order to improve the above-mentioned problems. However, when UDP communication is used, the real-time property of communication is improved, but the certainty of information transfer is impaired.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a mobile communication device capable of achieving both real-time performance and certainty of information transfer.

(1) The mobile communication device according to the present invention includes an information input unit mounted on the mobile body and continuously input information other than voice information including at least position information of the mobile body, and the above information. Communication between the storage unit that stores the information input to the input unit and the information stored in the storage unit between the first band for communication with the base station of the first communication company and the base station of the second communication company. The latest band stored in the storage unit is stored in the storage unit by selecting the band having the better communication state from the first transmission unit capable of transmitting by UDP communication and the first band and the second band for the second band. A control unit for transmitting the above information to the first transmission unit is provided.

The information input from the information input unit is stored in the storage unit. The latest information among the information stored in the storage unit is transmitted from the first transmission unit by UDP communication. In the transmission from the first transmission unit, the control unit selects and transmits the band having the better communication state from the first band and the second band. For example, if a communication failure occurs in the first band and good communication is possible in the second band, data is transmitted in the second band.

Since the latest information is transmitted by UDP communication, the real-time property of communication is improved as compared with TCP communication. Further, since the band having the better communication state is selected from the first band and the second band for transmission, the certainty of information transfer is improved as compared with the normal UDP communication. Also, unlike TCP communication, retries are not repeated, so the risk of the server going down after the communication failure is resolved is reduced.

(2) The mobile communication device according to the present invention further includes a radio wave intensity detecting unit that detects the strength of the radio waves of the first band and the second band received by the antenna. The control unit selects the band with the stronger radio wave strength as the band with the better communication state, and causes the first transmission unit to transmit the latest information.

As a means for selecting the band with the better communication condition, there is a judgment based on the strength of the received radio wave.

(3) The first transmission unit is a first communication antenna that receives the radio wave of the first band, and a first radio wave strength detection unit that detects the strength of the radio wave of the first band received by the first communication antenna. And a first communication modem that has a first driver that outputs communication status information including radio wave strength information and communication establishment information indicating whether or not communication is possible, and communicates with the base station of the first communication company. , Radio wave strength information and communication are possible with the second communication antenna that receives the radio wave of the second band and the second radio wave strength detection unit that detects the strength of the radio wave of the second band received by the second communication antenna. It has a second driver that outputs communication status information including communication establishment information indicating whether or not, and includes a second communication modem that communicates with the base station of the second communication company. The control unit acquires the communication status information from the first driver and the second driver, selects the band for which communication is established and the radio field strength is strong as the band with the better communication status, and is the latest. Information is transmitted to the first transmission unit.

The communication status information of the first band is input from the first driver of the first communication modem to the control unit. The communication status information of the second band is input from the second driver of the second communication modem to the control unit. The control unit determines the band to be transmitted based on the input communication status information.

(4) The first communication modem may include a first mounting portion on which the SIM card is mounted, and the second communication modem may include a second mounting portion on which the SIM card is mounted.

By changing the SIM card, the first telecommunications company and the second telecommunications company are changed. Therefore, the mobile communication device can be used in a plurality of countries or regions, or the mobile communication device can be used by using a communication company selected by the user.

(5) The control unit transmits the latest information stored in the storage unit from the first port of the first transmission unit, determines whether or not a communication failure has occurred, and determines that a communication failure has occurred. On the condition that the communication failure has occurred, the information stored in the storage unit may be transmitted from the second port of the first transmission unit.

The communication failure means a state in which communication cannot be performed in both the first band and the second band. That is, it means that the information from the mobile communication device cannot be received by the base station or the like of the communication company. When the control unit determines that a communication failure has occurred, when the communication failure is resolved, the past information collected during the period when the communication failure occurred is used as a second port different from the first port for transmitting the latest information. Is transmitted by UDP communication.

When the communication failure is resolved, the past information collected during the period when the communication failure occurred is transmitted, so that the certainty of information transfer is further improved. Further, since the transmission is performed by UDP communication, the load on the server immediately after the communication failure is resolved is reduced.

(6) The mobile communication device according to the present invention may further include a second transmission unit capable of transmitting data stored in the storage unit using TCP communication. The control unit transmits the latest information stored in the storage unit using the first transmission unit, determines whether or not a communication failure has occurred, and determines that a communication failure has occurred, on condition that the communication failure has occurred. , The information stored in the storage unit during the period when the communication failure has occurred is transmitted by using the second transmission unit.

When the control unit determines that a communication failure has occurred, when the communication failure is resolved, the control unit transmits the past information collected during the period in which the communication failure has occurred by TCP communication using the second communication unit. Since the past information collected during the period when the communication failure has occurred is transmitted by TCP communication using the second communication unit, the certainty of information transfer is further improved.

(7) The control unit may perform an encryption process for encrypting the information stored in the storage unit.

(8) The present invention can also be regarded as an operation management system including the above-mentioned mobile communication device and a management server into which information transmitted by the mobile communication device is input. The mobile communication device further includes a clock module that outputs time information. The storage unit stores identification symbols individually assigned to the mobile communication device. The control unit stores the information in the storage unit in correspondence with the time information when the information is input, and associates the information with the time information and the identification symbol in the first transmission. Send from the department. The management server includes a device memory that stores the information, the time information, and the identification symbol in association with each other.

The management server manages the operation of the mobile body in real time based on the latest information transmitted from the mobile communication device by UDP communication. In addition, the management server supplements the missing information due to the communication failure with the past information transmitted by UDP communication or TCP communication.

According to the present invention, it is possible to provide a mobile communication device and an operation management system capable of achieving both real-time performance and certainty of information transfer.

FIG. 1 is a configuration diagram of the operation management system 10. FIG. 2 is a functional block diagram of the mobile communication device 11. FIG. 3 is a functional block diagram of the communication unit 50. FIG. 4 is a flowchart of the communication modem selection process. FIG. 5 is a flowchart of processing at the time of communication failure. FIG. 6 is a functional block diagram of the communication unit 100 in the modified example.

Hereinafter, embodiments of the present invention will be described. It goes without saying that the embodiments described below are merely examples of the present invention, and the embodiments of the present invention can be appropriately changed without changing the gist of the present invention.

In this embodiment, the operation management system 10 shown in FIG. 1 will be described. The operation management system 10 is composed of a plurality of mobile communication devices 11 and one management server 12. That is, one management server 12 manages a plurality of mobile communication devices 11. The number of management servers 12 may be plurality.

One mobile communication device 11 is mounted on each of the plurality of mobiles. A moving body is a vehicle, an aircraft, or the like. In the present embodiment, the vehicle 20 is described as the moving body. The operation management system 10 is used for operation management of the vehicle 20 by, for example, a carrier who owns a plurality of vehicles 20 and operates a transportation business. For the purpose of simplifying the drawing, only one vehicle 20 is displayed in FIG.

The management server 12 is installed in, for example, an office and is operated by an operator. The operator inputs necessary data into the management server 12 using the input terminal 13, and creates a plan for operation management. The plan is, for example, an operation instruction sheet having items such as the vehicle to be used, the name of the driver to board, the name of the destination, the name of the transit point, and the name of the destination. The created plan is stored in the device memory 12A of the management server 12.

The management server 12 stores the information (operation information) sent from the mobile communication device 11 in the device memory 12A, compares the operation information with the plan, and operates each vehicle 20 according to the plan. Monitor whether or not it is. Details will be described later.

Specifically, the mobile communication device 11 is an information collecting device having a communication function. More specifically, the mobile communication device 11 is a digital tachograph that collects vehicle speed information and the like. In the following, an example in which the mobile communication device 11 is a digital tachograph will be described. However, the mobile communication device 11 is not limited to the digital tachograph.

The mobile communication device 11 receives information from various sensors and the like mounted on the vehicle 20. The various sensors and the like are the vehicle speed sensor 21, the rotation speed sensor 22, the temperature sensor 23, the GPS antenna 24, and the like shown in FIG.

The vehicle speed sensor 21 outputs vehicle speed information indicating the vehicle speed of the vehicle 20. The rotation speed sensor 22 outputs rotation speed information indicating the rotation speed of the engine. The GPS antenna 24 receives and outputs the position information transmitted by the GPS satellite 14 (FIG. 1). The temperature sensor 23 outputs temperature information indicating the temperature inside the vehicle. The temperature sensor 23 is used for detecting the temperature inside the refrigerator, for example, when the vehicle 20 is a cold storage vehicle or a freezing vehicle. Information may be input from a sensor other than these sensors, an ETC receiver, or the like.

The mobile communication device 11 includes a power supply circuit 37 that generates a DC voltage for driving the control unit 40, the communication unit 50, and the like, which will be described later. The power supply circuit 37 is electrically connected to the power supply input unit 36. The power input unit 36 is electrically connected to the output terminal of the battery 25 included in the vehicle 20. That is, the power supply circuit 37 receives a DC voltage from the battery 25. The power supply circuit 37 includes, for example, a DC-DC converter, a regulator, a Zener diode, or the like, and converts the input DC voltage into a predetermined stable DC voltage (for example, 5V or 3.3V) and outputs it. In FIG. 2, the power supply line from the power supply circuit 37 to each circuit is not shown.

The mobile communication device 11 includes a clock module 35 that outputs time information. The time information output by the clock module 35 is stored in the storage unit 41 in association with the information as the input time of the information input to the information input unit 30.

The mobile communication device 11 has an information input unit 30 for inputting the above-mentioned vehicle speed information and the like, a storage unit 41 for storing the information input to the information input unit 30, and the vehicle 20 for storing the information stored in the storage unit 41. A communication unit 50 for transmitting information to the outside of the device and a control unit 40 for controlling these operations are provided. As the storage unit 41 and the control unit 40, for example, a raspberry pie 2 manufactured by Acorn Corporation (trademark) can be used.

The information input unit 30 is electrically connected to the first input unit 31 electrically connected to the vehicle speed sensor 21, the second input unit 32 electrically connected to the rotation speed sensor 22, and the temperature sensor 23. A third input unit 33 and a fourth input unit 34 that are electrically connected to the GPS antenna 24 are provided.

In addition to the input information, the storage unit 41 stores in advance identification symbols individually assigned to the plurality of mobile communication devices 11. Each mobile communication device 11 (ie, vehicle 20) is individually identified by an identification symbol.

The identification symbol, the input information, and the time information stored in the storage unit 41 are transmitted from the communication unit 50. In the following, the transmitted identification code, the input information, and the time information are collectively referred to as operation information, and the communication unit 50 will be described.

The communication unit 50 includes a first transmission unit 51. The first transmission unit 51 includes a first communication modem 60 that communicates with a predetermined communication company (hereinafter, first communication company) in the first band, and another predetermined communication company (hereinafter, second communication company). It includes a second communication modem 70 that communicates in two bands. The first band is a frequency band allocated to the first communication company, and the second band is a frequency band allocated to the second communication company.

The first communication modem 60 includes a first communication antenna 66, a first output unit 62, a first radio wave strength detection unit 65, a first driver 61 that controls these operations, and a SIM card (Subscriber Identity Module Card). Is provided with a first mounting portion 67 to which the is mounted. The second communication modem 70 is equipped with a second communication antenna 76, a second output unit 72, a second radio wave strength detection unit 75, a second driver 71 that controls their operation, and a second SIM card. A mounting portion 77 is provided.

The first communication antenna 66 is formed of a pattern foil on a substrate as, for example, a pole antenna or a loop antenna.

The first output unit 62 demodulates, for example, a modulation circuit that modulates a signal (information) to be transmitted, an output circuit that transmits the modulated signal from the first communication antenna 66, and a signal received by the first communication antenna 66. It is composed of a demodulation circuit. A modulation / demodulation IC is used for the modulation circuit and the demodulation circuit.

The first output unit 62 transmits the operation information to the base station of the first communication company by UDP communication. Further, the first output unit 62 transmits communication confirmation information and receives response information from the base station in order to confirm whether or not communication is possible. For example, the first output unit 62 transmits communication confirmation information at predetermined predetermined intervals (for example, 1 second intervals).

By receiving the response information, it is confirmed that the base station is receiving the transmitted radio waves satisfactorily. That is, it is confirmed that communication is possible. When the communication confirmation information does not reach the base station due to a communication failure or the like, the first communication modem 60 does not receive the response information. By not receiving the response information, it is confirmed that a communication failure has occurred.

The first output unit 62 has a first port 63 and a second port 64 that perform UDP communication. The first port 63 is a port for transmitting the latest operation information. The latest operation information means, for example, the operation information obtained after the operation information transmitted last time, and does not necessarily mean only the latest operation information. The first output unit 62 transmits the latest operation information from the first port 63 at predetermined predetermined intervals (for example, 1 second intervals). The operation information is transmitted by, for example, a packet method.

The second port 64 is a port for transmitting operation information during a period in which a communication failure has occurred. The period during which the communication failure has occurred means the period during which the response information is not received by both the first communication modem 60 and the second communication modem 70. That is, it means a period during which communication cannot be performed by both the first communication modem 60 and the second communication modem 70.

The first radio wave strength detection unit 65 detects the strength of the received radio wave (for example, response information). For example, the first radio field strength detection unit 65 includes a conversion circuit (resistor) that converts the radio wave received by the first communication antenna 66 into a voltage, an amplifier circuit (comparator) that amplifies the converted voltage, and a number of amplified voltages. It is realized by a comparison circuit (comparator) that compares with the reference voltage. The first radio wave strength detection unit 65 outputs the detected radio wave strength to the first driver 61 as radio wave strength information.

The first driver 61 determines whether or not communication is possible depending on whether or not the first communication antenna 66 has received the response information. The first driver 61 outputs the communication state information including the communication establishment information indicating whether or not communication is possible and the radio wave strength information input from the first radio wave strength detection unit 65 to the control unit 40.

The first mounting unit 67 is a socket, a slot, or the like in which the user mounts the SIM card. The SIM card identifies the first telecommunications company. By changing the SIM card, the frequency band of the first communication company and the first band with which the first communication modem 60 communicates is changed. In order to change the frequency band of the first band, a plurality of communication antennas, an antenna gain adjustment circuit, and the like are incorporated in the first communication modem. Since these are usually mounted on a communication modem, detailed description is omitted.

The second communication modem 70 has the same configuration as the first communication modem 60. Hereinafter, the second communication modem 70 will be briefly described.

The second output unit 72 of the second communication modem 70 has the same configuration as the first output unit 62 of the first communication modem 60. The second output unit 72 includes a third port 73 corresponding to the first port 63 of the first output unit 62, and a fourth port 74 corresponding to the second port 64 of the first output unit 62. That is, the third port 73 is a port for transmitting the latest operation information, and the fourth port 74 is a port for transmitting operation information during the period in which the communication failure has occurred.

The second communication antenna 76, the second radio field strength detection unit 75, and the second driver 71 of the second communication modem 70 include the first communication antenna 66, the first radio field strength detection unit 65, and the first radio wave strength detection unit 65 of the first communication modem 60. It has the same configuration as the driver 61.

The second mounting unit 77 of the second communication modem 70 has the same configuration as the first mounting unit 67. The second telecommunications company is identified by the SIM card mounted on the second mounting unit 77. By changing the SIM card, the frequency band of the second communication company and the second band with which the second communication modem 70 communicates is changed.

The control unit 40 determines whether the operation information is transmitted by the first communication modem 60 or the operation information is transmitted by the second communication modem 70. The determination of the control unit 40 (communication modem selection process) will be described with reference to FIG.

The control unit 40 waits until communication status information is input from both the first communication modem 60 and the second communication modem 70 (S11: No). The communication status information is input to the control unit 40 at intervals of 1 second, for example.

When the communication status information is input from both the first communication modem 60 and the second communication modem 70 (S11: Yes), the control unit 40 determines whether or not the first communication modem 60 can communicate (S12). .. Whether or not the first communication modem 60 can communicate is determined by the communication establishment information included in the communication status information input from the first communication modem 60. Specifically, the control unit 40 determines that communication is possible because the first communication modem 60 receives the response information from the base station, and communicates because the first communication modem 60 does not receive the response information. Judge as impossible.

When the control unit 40 determines that the first communication modem 60 cannot communicate (S12: No), the control unit 40 determines whether or not the second communication modem 70 can communicate (S13). Whether or not the second communication modem 70 can communicate is determined in the same manner as the first communication modem 60. When the control unit 40 determines that the second communication modem 70 cannot communicate (S13: No), it determines that a communication failure has occurred (S14). When the control unit 40 determines that a communication failure has occurred, the control unit 40 executes a communication failure time process (S15). The processing at the time of communication failure will be described with reference to FIG.

The control unit 40 waits until a communication failure occurs (S21: No). When the control unit 40 determines that a communication failure has occurred (S21: Yes), the control unit 40 stores the time information at the time of the communication failure in the storage unit 41 (S22). Next, the control unit 40 waits until the communication failure is resolved (S23: No). Whether or not the communication failure is resolved is determined by the communication status information input from the first communication modem 60 and the second communication modem 70. Specifically, when the response information is received by at least one of the first communication modem 60 and the second communication modem 70, it is determined that the communication failure has been resolved.

When the control unit 40 determines that the communication failure has been resolved (S23: Yes), the control unit 40 determines the communication modem to be used as the first communication modem 60 or the second communication modem 70 (S24). The determination of the communication modem is determined in the same manner as in steps S16 to S19 described later.

When the control unit 40 determines the communication modem to be used as the first communication modem 60 (S24), the control unit 40 transmits the operation information input from the second port 64 of the first communication modem 60 during the period when the communication failure occurs in UDP communication. Send by. When the control unit 40 determines the communication modem to be the second communication modem 70 (S24), the control unit 40 transmits the operation information input during the period when the communication failure has occurred from the fourth port 74 of the second communication modem 70 by UDP communication. To do.

Returning to FIG. 4, when the control unit 40 determines that the first communication modem 60 can communicate (S12: Yes), the control unit 40 determines whether or not the second communication modem 70 can communicate (S16). When the control unit 40 determines that the second communication modem 70 cannot communicate (S16: No), the control unit 40 determines the communication modem to use the first communication modem 60, and obtains the latest operation information by the first communication modem by UDP communication. It is transmitted from the first port 63 of 60 (S18).

On the other hand, when the control unit 40 determines that the first communication modem 60 cannot communicate (S12: No) and the second communication modem 70 can communicate (S13: Yes), the control unit 40 uses the second communication modem 70. The communication modem is determined, and the latest operation information is transmitted from the third port 73 of the second communication modem 70 by UDP communication (S19).

When the control unit 40 determines that both the first communication modem 60 and the second communication modem 70 can communicate (S12: Yes & S16: Yes), the radio wave strength of the radio wave received by the first communication modem 60 (first radio wave strength). Is stronger than the radio wave strength (second radio wave strength) of the radio wave received by the second communication modem 70 (S17). The first radio wave strength and the second radio wave strength are indicated by the radio wave strength information included in the communication state information input from the first communication modem 60 and the second communication modem 70.

When the control unit 40 determines that the first radio wave strength is stronger than the second radio wave strength (S17: Yes), the control unit 40 determines the communication modem to use the first communication modem 60, and sets the latest operation information of the first communication modem 60. It is transmitted from the first port 63 by UDP communication (S18). When the control unit 40 determines that the first radio wave strength is weaker than the second radio wave strength (S17: No), the control unit 40 determines the communication modem to use the second communication modem 70, and determines the latest operation information of the second communication modem 70. It is transmitted from the third port 73 by UDP communication (S19). That is, when both the first communication modem 60 and the second communication modem 70 can communicate with each other, the control unit 40 selects the communication modem having the stronger radio wave strength of the received radio wave and performs UDP communication.

For example, when the vehicle 20 travels in a place near the base station of the first communication company and far from the base station of the second communication company, the mobile communication device 11 uses the first communication with good radio wave condition. Operation information is transmitted by the modem 60. Further, when there is an obstacle such as a building between the vehicle 20 and the base station of the first communication company, the mobile communication device 11 transmits the operation information by the second communication modem 70 having a good radio wave condition.

When transmitting the operation information, the control unit 40 compresses and encrypts the operation information. For encryption, for example, MQTT (Message Queue Telemetry Transport) or the like can be used. In addition, encryption processing other than MQTT may be performed.

The operation information transmitted by the mobile communication device 11 is input to the management server 12. The management server 12 identifies the vehicle 20 that has transmitted the operation information from the identification symbol included in the operation information. The management server 12 specifies a plan (operation instruction) on which the specified vehicle 20 is engaged. The management server 12 stores each item of the specified plan and the operation information in the device memory 12A in association with each other. Further, the management server 12 compares each item of the plan with the operation information, and if there is a difference, warns the operator and the like. As an example, the travel route of the plan is compared with the position information included in the operation information, and it is determined whether or not the actual travel route of the vehicle 20 matches the travel route of the plan. When the management server 12 determines that the travel routes do not match, the management server 12 issues a warning notification. The warning notification is executed by displaying a warning text on the screen or by outputting a warning voice from the speaker.

Although the travel route has been described as an example of the operation management item, the operation management item of the vehicle 20 is not limited to the travel route. Various items such as a driver, a resting place, a destination, a resting time, and an arrival time may be used as the operation management item of the vehicle 20.

[Action effect]

In the present embodiment, since the latest operation information is transmitted by UDP communication, the real-time property of communication is improved as compared with TCP communication. Further, when both the first communication modem 60 and the second communication modem 70 can communicate with each other, the one with the stronger radio wave strength of the received radio wave is selected and the operation information is transmitted, so that the information is more than the normal UDP communication. The certainty of delivery is improved. As a result, the mobile communication device 11 is realized, which has better real-time communication than TCP communication and more reliable information transfer than normal UDP communication.

Further, in the present embodiment, since the operation information is transmitted by UDP communication, the retry is not repeated unlike the TCP communication. As a result, there is no risk that the management server 12 will go down after the communication failure is resolved.

Further, in the present embodiment, since the communication modem to be used is determined by the reception of the response information and the radio wave strength of the received radio wave, the quality of the radio wave condition is determined as compared with the case where the communication modem is determined only by the radio wave strength. Judgment becomes accurate.

Further, in the present embodiment, since the operation information input while the communication failure has occurred is transmitted together with the latest operation information after the communication failure is resolved, the certainty of information transfer is further enhanced.

Further, in the present embodiment, since the mounting portions 67 and 77 on which the SIM card is mounted are provided, the mobile communication device 11 can be used in a plurality of countries and regions, and the communication company selected by the user is used. be able to.

Further, in the present embodiment, since the operation information to be transmitted is encrypted, the security of the information is enhanced.

[Modification example]

In the above-described embodiment, an example in which the latest operation information and the operation information during the communication failure are both transmitted by UDP communication has been described. In this modified example, an example in which the latest operation information is transmitted by UDP communication and the operation information during a communication failure is transmitted by TCP communication will be described. The same configurations as those in the embodiment are designated by the same reference numerals as those in the embodiments, and the description thereof will be omitted.

The mobile communication device 11 of this modification includes the communication unit 100 shown in FIG. 6 instead of the communication unit 50 shown in FIG. The communication unit 100 includes a second transmission unit 52 in addition to the first transmission unit 51 described in the above embodiment.

The second transmission unit 52 includes a third communication modem 80 and a fourth communication modem 90. The third communication modem 80 and the fourth communication modem 90 transmit operation information during a communication failure by TCP communication.

The third communication modem 80 includes a third driver 81, a third output unit 82, a third radio wave strength detection unit 85, a third communication antenna 86, and a third mounting unit 87. The fourth communication modem 90 includes a fourth driver 91, a fourth output unit 92, a fourth radio wave intensity detection unit 95, a fourth communication antenna 96, and a fourth mounting unit 97.

The third driver 81 and the fourth driver 91 have the same configuration as the first driver 61 and the second driver 71. The third output unit 82 and the fourth output unit 92 have the same configuration as the first output unit 62 and the second output unit 72. However, the third output unit 82 includes a fifth port 83 and a sixth port 84 that perform TCP communication, and the fourth output unit 92 includes a seventh port 93 and an eighth port 94 that perform TCP communication. The third radio field strength detection unit 85 and the fourth radio wave strength detection unit 95 have the same configuration as the first radio wave strength detection unit 65 and the second radio wave strength detection unit 75. The third communication antenna 86 has the same configuration as the first communication antenna 66, and the fourth communication antenna 96 has the same configuration as the second communication antenna 76. The third mounting portion 87 and the fourth mounting portion 97 have the same configuration as the first mounting portion 67 and the second mounting portion 77.

The third communication modem 80 communicates with a band corresponding to the SIM card mounted on the third mounting unit 87 and a communication company. In the following, an example in which the third communication modem 80 communicates in the same first band as the first communication modem 60 will be described. The fourth communication modem 90 communicates with a band corresponding to the SIM card mounted on the fourth mounting unit 97 and a communication company. In the following, an example in which the fourth communication modem 90 communicates in the same second band as the second communication modem 70 will be described. However, the third communication modem 80 and the fourth communication modem 90 may communicate with a communication company different from the first communication company and the second communication company.

Of the third communication modem 80 and the fourth communication modem 90, the communication modem having the better radio wave condition is determined as the communication modem to be used. The determination of the communication modem is made in the same manner as in the above-described embodiment (FIG. 4).

In this modification, the latest operation information is obtained by UDP communication using the band having the better radio wave condition of the first communication modem 60 (first band) and the second communication modem 70 (second band). Will be sent. On the other hand, the operation information during the communication failure is obtained by using the band having the better radio wave condition among the third communication modem 80 (first band) and the fourth communication modem 90 (second band). It is transmitted by TCP communication.

Since the latest information is transmitted by UDP communication, the real-time property of communication is ensured. On the other hand, since the operation information during the communication failure is transmitted by TCP communication, the certainty of information transfer is ensured.

In the above-described embodiment, an example has been described in which the mobile communication device 11 includes two communication modems, a first communication modem 60 and a second communication modem 70. However, the mobile communication device 11 may include three or more communication modems. In this case, the control unit 40 of the mobile communication device 11 determines that a communication failure has occurred when all the communication modems cannot communicate, and executes the communication failure time processing shown in FIG. Further, the control unit 40 transmits operation information using the communication modem having the strongest radio wave strength among the communication modems capable of communicating.

Further, in the above-described embodiment, an example of determining the communication modem using both the response information and the radio wave intensity information has been described. However, the determination of the communication modem may be performed only by the signal strength information. In this case, the processing of the drivers 61, 71, 81, 91 and the control unit 40 can be simplified.

In the above-described embodiment and modification, an example in which the first communication modem 60, the second communication modem 70, the third communication modem 80, and the fourth communication modem 90 are provided with communication antennas 66, 76, 86, 96, respectively, will be described. It was. However, the first communication modem 60, the second communication modem 70, the third communication modem 80, and the fourth communication modem 90 may share one communication antenna.

In the above modification, the first communication modem 60 performs UDP communication, the third communication modem 80 performs TCP communication in the first band of the first communication company, and the second in the second band of the second communication company. An example in which the communication modem 70 performs UDP communication and the fourth communication modem 90 performs TCP communication has been described. However, the function of the third communication modem 80 may be added to the first communication modem 60, and the function of the fourth communication modem 90 may be added to the second communication modem 70. That is, in the first band of the first communication company, the first communication modem 60 performs UDP communication and TCP communication, and in the second band of the second communication company, the second communication modem 70 performs UDP communication and TCP communication. May be good.

10 ... Operation management system 11 ... Mobile communication device 12 ... Management server 12A ... Device memory 20 ... Vehicle 30 ... Information input unit 35 ... Clock module 40 ... Control Unit 41 ... Storage unit 50, 100 ... Communication unit 51 ... First transmission unit 52 ... Second transmission unit 60 ... First communication modem 61 ... First driver 63 ... 1st port 64 ... 2nd port 65 ... 1st radio field strength detection unit 66 ... 1st communication antenna 67 ... 1st mounting unit 70 ... 2nd communication modem 71 ... 2nd Driver 75 ... 2nd radio field strength detection unit 76 ... 2nd communication antenna 77 ... 2nd mounting unit 80 ... 3rd communication modem 90 ... 4th communication modem

The present invention relates to a mobile communication device mounted on a mobile body such as a vehicle or an aircraft, and an operation management system.

There is an operation management system that manages the operation of a vehicle (see, for example, Patent Document 1). The operation management system is constructed by a mobile communication device mounted on the vehicle and a management server. The mobile communication device is, for example, a digital tachograph having a communication function. The management server manages the operation of the vehicle based on the operation information transmitted by the mobile communication device.

In the operation management system, for example, TCP (Transmission Control Protocol) communication is used for communication with the mobile body.

Japanese Unexamined Patent Publication No. 2016-151835

By using TCP communication, operation information can be reliably passed from the vehicle to the management server. However, in TCP communication, it may take time to transfer information, and there is a problem that there is no real-time property.

Specifically, in TCP communication, when a communication failure occurs and the server cannot receive information, it waits until a predetermined time elapses, then sends a negative response, and then retransmits the information (retry). )repeat. As a result, it may take time to transfer information.

Further, in TCP communication, a time weight is provided at the time of reconnection. Due to this time weight, it takes time to transfer information.

Further, in TCP communication, the load on the management server may suddenly increase due to the retry immediately after the communication failure is recovered, and the server may go down.

The inventors of the present application have attempted to use UDP (User Datagram Protocol) communication in order to improve the above-mentioned problems. However, when UDP communication is used, the real-time property of communication is improved, but the certainty of information transfer is impaired.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a mobile communication device capable of achieving both real-time performance and certainty of information transfer.

(1) The mobile communication device according to the present invention is an information input unit mounted on a mobile body, which is information other than voice and continuously inputs operation information including at least position information and vehicle speed information of the mobile body. If, the information storage unit for storing the operation information input to the input unit, the operation information stored in the storage unit, the first band and the second for communication with the base station of the first communication company In the second band for communication with the base station of the communication company, the first transmitter capable of transmitting by UDP communication, and the band having the better communication state from the first band and the second band is selected. A control unit for transmitting the latest operation information stored in the storage unit to the first transmission unit is provided.

Operation information inputted from the information input unit is stored in the storage unit. Latest operation information among the stored in the storage unit operation information is transmitted by UDP communication from the first transmission unit. In the transmission from the first transmission unit, the control unit selects and transmits the band having the better communication state from the first band and the second band. For example, if a communication failure occurs in the first band and good communication is possible in the second band, data is transmitted in the second band.

Since the latest operation information is transmitted by UDP communication, the real-time property of communication is improved as compared with TCP communication. Further, since the band having the better communication state is selected from the first band and the second band for transmission, the certainty of information transfer is improved as compared with the normal UDP communication. Also, unlike TCP communication, retries are not repeated, so the risk of the server going down after the communication failure is resolved is reduced.

(2) The mobile communication device according to the present invention further includes a radio wave intensity detecting unit that detects the strength of the radio waves of the first band and the second band received by the antenna. The control unit selects the band with the stronger radio wave strength as the band with the better communication state, and causes the first transmission unit to transmit the latest operation information.

As a means for selecting the band with the better communication condition, there is a judgment based on the strength of the received radio wave.

(3) The first transmission unit is a first communication antenna that receives the radio wave of the first band, and a first radio wave strength detection unit that detects the strength of the radio wave of the first band received by the first communication antenna. And a first communication modem that has a first driver that outputs communication status information including radio wave strength information and communication establishment information indicating whether or not communication is possible, and communicates with the base station of the first communication company. , Radio wave strength information and communication are possible with the second communication antenna that receives the radio wave of the second band and the second radio wave strength detection unit that detects the strength of the radio wave of the second band received by the second communication antenna. It has a second driver that outputs communication status information including communication establishment information indicating whether or not, and includes a second communication modem that communicates with the base station of the second communication company. The control unit acquires the communication status information from the first driver and the second driver, selects the band for which communication is established and the radio field strength is strong as the band with the better communication status, and is the latest. The above-mentioned operation information is transmitted to the above-mentioned first transmission unit.

The communication status information of the first band is input from the first driver of the first communication modem to the control unit. The communication status information of the second band is input from the second driver of the second communication modem to the control unit. The control unit determines the band to be transmitted based on the input communication status information.

(4) The first communication modem may include a first mounting portion on which the SIM card is mounted, and the second communication modem may include a second mounting portion on which the SIM card is mounted.

By changing the SIM card, the first telecommunications company and the second telecommunications company are changed. Therefore, the mobile communication device can be used in a plurality of countries or regions, or the mobile communication device can be used by using a communication company selected by the user.

(5) The control unit transmits the latest operation information stored in the storage unit from the first port of the first transmission unit, determines whether or not a communication failure has occurred, and a communication failure occurs. The operation information during the period in which the communication failure has occurred may be transmitted from the second port of the first transmission unit on condition that the determination is made.

The communication failure means a state in which communication cannot be performed in both the first band and the second band. That is, it means that the information from the mobile communication device cannot be received by the base station or the like of the communication company. When the control unit determines that a communication failure has occurred, when the communication failure is resolved, the past information collected during the period when the communication failure occurred is used for the second port, which is different from the first port for transmitting the latest operation information. It is transmitted by UDP communication using the port.

When the communication failure is resolved, the past information collected during the period when the communication failure occurred is transmitted, so that the certainty of the operation information delivery is further improved. Further, since the transmission is performed by UDP communication, the load on the server immediately after the communication failure is resolved is reduced.

(6) The mobile communication device according to the present invention may further include a second transmission unit capable of transmitting data stored in the storage unit using TCP communication. The control unit transmits the latest operation information stored in the storage unit using the first transmission unit, determines whether or not a communication failure has occurred, and determines that a communication failure has occurred. As a condition, the above-mentioned operation information during the period in which the communication failure has occurred is transmitted by using the above-mentioned second transmission unit.

When the control unit determines that a communication failure has occurred, when the communication failure is resolved, the control unit transmits the past information collected during the period in which the communication failure has occurred by TCP communication using the second communication unit. Since the past information collected during the period when the communication failure has occurred is transmitted by TCP communication using the second communication unit, the certainty of the operation information delivery is further improved.

(7) The control unit may perform an encryption process for encrypting the operation information stored in the storage unit.

(8) The present invention can also be regarded as an operation management system including the above-mentioned mobile communication device and a management server into which the above-mentioned operation information transmitted by the mobile communication device is input. The mobile communication device further includes a clock module that outputs time information. The storage unit stores identification symbols individually assigned to the mobile communication device. The control unit associates the operation information with the time information when the operation information is input and stores the operation information in the storage unit, and associates the operation information with the time information and the identification symbol. It is transmitted from the first transmission unit. The management server includes a device memory that stores the operation information, the time information, and the identification symbol in association with each other.

The management server manages the operation of the mobile body in real time by the latest operation information transmitted from the mobile communication device by UDP communication. In addition, the management server supplements the missing operation information due to the communication failure with the past information transmitted by UDP communication or TCP communication.

According to the present invention, it is possible to provide a mobile communication device and an operation management system capable of achieving both real-time performance and certainty of operation information delivery.

FIG. 1 is a configuration diagram of the operation management system 10. FIG. 2 is a functional block diagram of the mobile communication device 11. FIG. 3 is a functional block diagram of the communication unit 50. FIG. 4 is a flowchart of the communication modem selection process. FIG. 5 is a flowchart of processing at the time of communication failure. FIG. 6 is a functional block diagram of the communication unit 100 in the modified example.

Hereinafter, embodiments of the present invention will be described. It goes without saying that the embodiments described below are merely examples of the present invention, and the embodiments of the present invention can be appropriately changed without changing the gist of the present invention.

In this embodiment, the operation management system 10 shown in FIG. 1 will be described. The operation management system 10 is composed of a plurality of mobile communication devices 11 and one management server 12. That is, one management server 12 manages a plurality of mobile communication devices 11. The number of management servers 12 may be plurality.

One mobile communication device 11 is mounted on each of the plurality of mobiles. A moving body is a vehicle, an aircraft, or the like. In the present embodiment, the vehicle 20 is described as the moving body. The operation management system 10 is used for operation management of the vehicle 20 by, for example, a carrier who owns a plurality of vehicles 20 and operates a transportation business. For the purpose of simplifying the drawing, only one vehicle 20 is displayed in FIG.

The management server 12 is installed in, for example, an office and is operated by an operator. The operator inputs necessary data into the management server 12 using the input terminal 13, and creates a plan for operation management. The plan is, for example, an operation instruction sheet having items such as the vehicle to be used, the name of the driver to board, the name of the destination, the name of the transit point, and the name of the destination. The created plan is stored in the device memory 12A of the management server 12.

The management server 12 stores the information (operation information) sent from the mobile communication device 11 in the device memory 12A, compares the operation information with the plan, and operates each vehicle 20 according to the plan. Monitor whether or not it is. Details will be described later.

Specifically, the mobile communication device 11 is an information collecting device having a communication function. More specifically, the mobile communication device 11 is a digital tachograph that collects vehicle speed information and the like. In the following, an example in which the mobile communication device 11 is a digital tachograph will be described. However, the mobile communication device 11 is not limited to the digital tachograph.

The mobile communication device 11 receives information from various sensors and the like mounted on the vehicle 20. The various sensors and the like are the vehicle speed sensor 21, the rotation speed sensor 22, the temperature sensor 23, the GPS antenna 24, and the like shown in FIG.

The vehicle speed sensor 21 outputs vehicle speed information indicating the vehicle speed of the vehicle 20. The rotation speed sensor 22 outputs rotation speed information indicating the rotation speed of the engine. The GPS antenna 24 receives and outputs the position information transmitted by the GPS satellite 14 (FIG. 1). The temperature sensor 23 outputs temperature information indicating the temperature inside the vehicle. The temperature sensor 23 is used for detecting the temperature inside the refrigerator, for example, when the vehicle 20 is a cold storage vehicle or a freezing vehicle. Information may be input from a sensor other than these sensors, an ETC receiver, or the like.

The mobile communication device 11 includes a power supply circuit 37 that generates a DC voltage for driving the control unit 40, the communication unit 50, and the like, which will be described later. The power supply circuit 37 is electrically connected to the power supply input unit 36. The power input unit 36 is electrically connected to the output terminal of the battery 25 included in the vehicle 20. That is, the power supply circuit 37 receives a DC voltage from the battery 25. The power supply circuit 37 includes, for example, a DC-DC converter, a regulator, a Zener diode, or the like, and converts the input DC voltage into a predetermined stable DC voltage (for example, 5V or 3.3V) and outputs it. In FIG. 2, the power supply line from the power supply circuit 37 to each circuit is not shown.

The mobile communication device 11 includes a clock module 35 that outputs time information. The time information output by the clock module 35 is stored in the storage unit 41 in association with the information as the input time of the information input to the information input unit 30.

The mobile communication device 11 has an information input unit 30 for inputting the above-mentioned vehicle speed information and the like, a storage unit 41 for storing the information input to the information input unit 30, and the vehicle 20 for storing the information stored in the storage unit 41. A communication unit 50 for transmitting information to the outside of the device and a control unit 40 for controlling these operations are provided. As the storage unit 41 and the control unit 40, for example, a raspberry pie 2 manufactured by Acorn Corporation (trademark) can be used.

The information input unit 30 is electrically connected to the first input unit 31 electrically connected to the vehicle speed sensor 21, the second input unit 32 electrically connected to the rotation speed sensor 22, and the temperature sensor 23. A third input unit 33 and a fourth input unit 34 that are electrically connected to the GPS antenna 24 are provided.

In addition to the input information, the storage unit 41 stores in advance identification symbols individually assigned to the plurality of mobile communication devices 11. Each mobile communication device 11 (ie, vehicle 20) is individually identified by an identification symbol.

The identification symbol, the input information, and the time information stored in the storage unit 41 are transmitted from the communication unit 50. In the following, the transmitted identification code, the input information, and the time information are collectively referred to as operation information, and the communication unit 50 will be described.

The communication unit 50 includes a first transmission unit 51. The first transmission unit 51 includes a first communication modem 60 that communicates with a predetermined communication company (hereinafter, first communication company) in the first band, and another predetermined communication company (hereinafter, second communication company). It includes a second communication modem 70 that communicates in two bands. The first band is a frequency band allocated to the first communication company, and the second band is a frequency band allocated to the second communication company.

The first communication modem 60 includes a first communication antenna 66, a first output unit 62, a first radio wave strength detection unit 65, a first driver 61 that controls these operations, and a SIM card (Subscriber Identity Module Card). Is provided with a first mounting portion 67 to which the is mounted. The second communication modem 70 is equipped with a second communication antenna 76, a second output unit 72, a second radio wave strength detection unit 75, a second driver 71 that controls their operation, and a second SIM card. A mounting portion 77 is provided.

The first communication antenna 66 is formed of a pattern foil on a substrate as, for example, a pole antenna or a loop antenna.

The first output unit 62 demodulates, for example, a modulation circuit that modulates a signal (information) to be transmitted, an output circuit that transmits the modulated signal from the first communication antenna 66, and a signal received by the first communication antenna 66. It is composed of a demodulation circuit. A modulation / demodulation IC is used for the modulation circuit and the demodulation circuit.

The first output unit 62 transmits the operation information to the base station of the first communication company by UDP communication. Further, the first output unit 62 transmits communication confirmation information and receives response information from the base station in order to confirm whether or not communication is possible. For example, the first output unit 62 transmits communication confirmation information at predetermined predetermined intervals (for example, 1 second intervals).

By receiving the response information, it is confirmed that the base station is receiving the transmitted radio waves satisfactorily. That is, it is confirmed that communication is possible. When the communication confirmation information does not reach the base station due to a communication failure or the like, the first communication modem 60 does not receive the response information. By not receiving the response information, it is confirmed that a communication failure has occurred.

The first output unit 62 has a first port 63 and a second port 64 that perform UDP communication. The first port 63 is a port for transmitting the latest operation information. The latest operation information means, for example, the operation information obtained after the operation information transmitted last time, and does not necessarily mean only the latest operation information. The first output unit 62 transmits the latest operation information from the first port 63 at predetermined predetermined intervals (for example, 1 second intervals). The operation information is transmitted by, for example, a packet method.

The second port 64 is a port for transmitting operation information during a period in which a communication failure has occurred. The period during which the communication failure has occurred means the period during which the response information is not received by both the first communication modem 60 and the second communication modem 70. That is, it means a period during which communication cannot be performed by both the first communication modem 60 and the second communication modem 70.

The first radio wave strength detection unit 65 detects the strength of the received radio wave (for example, response information). For example, the first radio field strength detection unit 65 includes a conversion circuit (resistor) that converts the radio wave received by the first communication antenna 66 into a voltage, an amplifier circuit (comparator) that amplifies the converted voltage, and a number of amplified voltages. It is realized by a comparison circuit (comparator) that compares with the reference voltage. The first radio wave strength detection unit 65 outputs the detected radio wave strength to the first driver 61 as radio wave strength information.

The first driver 61 determines whether or not communication is possible depending on whether or not the first communication antenna 66 has received the response information. The first driver 61 outputs the communication state information including the communication establishment information indicating whether or not communication is possible and the radio wave strength information input from the first radio wave strength detection unit 65 to the control unit 40.

The first mounting unit 67 is a socket, a slot, or the like in which the user mounts the SIM card. The SIM card identifies the first telecommunications company. By changing the SIM card, the frequency band of the first communication company and the first band with which the first communication modem 60 communicates is changed. In order to change the frequency band of the first band, a plurality of communication antennas, an antenna gain adjustment circuit, and the like are incorporated in the first communication modem. Since these are usually mounted on a communication modem, detailed description is omitted.

The second communication modem 70 has the same configuration as the first communication modem 60. Hereinafter, the second communication modem 70 will be briefly described.

The second output unit 72 of the second communication modem 70 has the same configuration as the first output unit 62 of the first communication modem 60. The second output unit 72 includes a third port 73 corresponding to the first port 63 of the first output unit 62, and a fourth port 74 corresponding to the second port 64 of the first output unit 62. That is, the third port 73 is a port for transmitting the latest operation information, and the fourth port 74 is a port for transmitting operation information during the period in which the communication failure has occurred.

The second communication antenna 76, the second radio field strength detection unit 75, and the second driver 71 of the second communication modem 70 include the first communication antenna 66, the first radio field strength detection unit 65, and the first radio wave strength detection unit 65 of the first communication modem 60. It has the same configuration as the driver 61.

The second mounting unit 77 of the second communication modem 70 has the same configuration as the first mounting unit 67. The second telecommunications company is identified by the SIM card mounted on the second mounting unit 77. By changing the SIM card, the frequency band of the second communication company and the second band with which the second communication modem 70 communicates is changed.

The control unit 40 determines whether the operation information is transmitted by the first communication modem 60 or the operation information is transmitted by the second communication modem 70. The determination of the control unit 40 (communication modem selection process) will be described with reference to FIG.

The control unit 40 waits until communication status information is input from both the first communication modem 60 and the second communication modem 70 (S11: No). The communication status information is input to the control unit 40 at intervals of 1 second, for example.

When the communication status information is input from both the first communication modem 60 and the second communication modem 70 (S11: Yes), the control unit 40 determines whether or not the first communication modem 60 can communicate (S12). .. Whether or not the first communication modem 60 can communicate is determined by the communication establishment information included in the communication status information input from the first communication modem 60. Specifically, the control unit 40 determines that communication is possible because the first communication modem 60 receives the response information from the base station, and communicates because the first communication modem 60 does not receive the response information. Judge as impossible.

When the control unit 40 determines that the first communication modem 60 cannot communicate (S12: No), the control unit 40 determines whether or not the second communication modem 70 can communicate (S13). Whether or not the second communication modem 70 can communicate is determined in the same manner as the first communication modem 60. When the control unit 40 determines that the second communication modem 70 cannot communicate (S13: No), it determines that a communication failure has occurred (S14). When the control unit 40 determines that a communication failure has occurred, the control unit 40 executes a communication failure time process (S15). The processing at the time of communication failure will be described with reference to FIG.

The control unit 40 waits until a communication failure occurs (S21: No). When the control unit 40 determines that a communication failure has occurred (S21: Yes), the control unit 40 stores the time information at the time of the communication failure in the storage unit 41 (S22). Next, the control unit 40 waits until the communication failure is resolved (S23: No). Whether or not the communication failure is resolved is determined by the communication status information input from the first communication modem 60 and the second communication modem 70. Specifically, when the response information is received by at least one of the first communication modem 60 and the second communication modem 70, it is determined that the communication failure has been resolved.

When the control unit 40 determines that the communication failure has been resolved (S23: Yes), the control unit 40 determines the communication modem to be used as the first communication modem 60 or the second communication modem 70 (S24). The determination of the communication modem is determined in the same manner as in steps S16 to S19 described later.

When the control unit 40 determines the communication modem to be used as the first communication modem 60 (S24), the control unit 40 transmits the operation information input from the second port 64 of the first communication modem 60 during the period when the communication failure occurs in UDP communication. Send by. When the control unit 40 determines the communication modem to be the second communication modem 70 (S24), the control unit 40 transmits the operation information input during the period when the communication failure has occurred from the fourth port 74 of the second communication modem 70 by UDP communication. To do.

Returning to FIG. 4, when the control unit 40 determines that the first communication modem 60 can communicate (S12: Yes), the control unit 40 determines whether or not the second communication modem 70 can communicate (S16). When the control unit 40 determines that the second communication modem 70 cannot communicate (S16: No), the control unit 40 determines the communication modem to use the first communication modem 60, and obtains the latest operation information by the first communication modem by UDP communication. It is transmitted from the first port 63 of 60 (S18).

On the other hand, when the control unit 40 determines that the first communication modem 60 cannot communicate (S12: No) and the second communication modem 70 can communicate (S13: Yes), the control unit 40 uses the second communication modem 70. The communication modem is determined, and the latest operation information is transmitted from the third port 73 of the second communication modem 70 by UDP communication (S19).

When the control unit 40 determines that both the first communication modem 60 and the second communication modem 70 can communicate (S12: Yes & S16: Yes), the radio wave strength of the radio wave received by the first communication modem 60 (first radio wave strength). Is stronger than the radio wave strength (second radio wave strength) of the radio wave received by the second communication modem 70 (S17). The first radio wave strength and the second radio wave strength are indicated by the radio wave strength information included in the communication state information input from the first communication modem 60 and the second communication modem 70.

When the control unit 40 determines that the first radio wave strength is stronger than the second radio wave strength (S17: Yes), the control unit 40 determines the communication modem to use the first communication modem 60, and sets the latest operation information of the first communication modem 60. It is transmitted from the first port 63 by UDP communication (S18). When the control unit 40 determines that the first radio wave strength is weaker than the second radio wave strength (S17: No), the control unit 40 determines the communication modem to use the second communication modem 70, and determines the latest operation information of the second communication modem 70. It is transmitted from the third port 73 by UDP communication (S19). That is, when both the first communication modem 60 and the second communication modem 70 can communicate with each other, the control unit 40 selects the communication modem having the stronger radio wave strength of the received radio wave and performs UDP communication.

For example, when the vehicle 20 travels in a place near the base station of the first communication company and far from the base station of the second communication company, the mobile communication device 11 uses the first communication with good radio wave condition. Operation information is transmitted by the modem 60. Further, when there is an obstacle such as a building between the vehicle 20 and the base station of the first communication company, the mobile communication device 11 transmits the operation information by the second communication modem 70 having a good radio wave condition.

When transmitting the operation information, the control unit 40 compresses and encrypts the operation information. For encryption, for example, MQTT (Message Queue Telemetry Transport) or the like can be used. In addition, encryption processing other than MQTT may be performed.

The operation information transmitted by the mobile communication device 11 is input to the management server 12. The management server 12 identifies the vehicle 20 that has transmitted the operation information from the identification symbol included in the operation information. The management server 12 specifies a plan (operation instruction) on which the specified vehicle 20 is engaged. The management server 12 stores each item of the specified plan and the operation information in the device memory 12A in association with each other. Further, the management server 12 compares each item of the plan with the operation information, and if there is a difference, warns the operator and the like. As an example, the travel route of the plan is compared with the position information included in the operation information, and it is determined whether or not the actual travel route of the vehicle 20 matches the travel route of the plan. When the management server 12 determines that the travel routes do not match, the management server 12 issues a warning notification. The warning notification is executed by displaying a warning text on the screen or by outputting a warning voice from the speaker.

Although the travel route has been described as an example of the operation management item, the operation management item of the vehicle 20 is not limited to the travel route. Various items such as a driver, a resting place, a destination, a resting time, and an arrival time may be used as the operation management item of the vehicle 20.

[Action effect]

In the present embodiment, since the latest operation information is transmitted by UDP communication, the real-time property of communication is improved as compared with TCP communication. Further, when both the first communication modem 60 and the second communication modem 70 can communicate with each other, the one with the stronger radio wave strength of the received radio wave is selected and the operation information is transmitted, so that the information is more than the normal UDP communication. The certainty of delivery is improved. As a result, the mobile communication device 11 is realized, which has better real-time communication than TCP communication and more reliable information transfer than normal UDP communication.

Further, in the present embodiment, since the operation information is transmitted by UDP communication, the retry is not repeated unlike the TCP communication. As a result, there is no risk that the management server 12 will go down after the communication failure is resolved.

Further, in the present embodiment, since the communication modem to be used is determined by the reception of the response information and the radio wave strength of the received radio wave, the quality of the radio wave condition is determined as compared with the case where the communication modem is determined only by the radio wave strength. Judgment becomes accurate.

Further, in the present embodiment, since the operation information input while the communication failure has occurred is transmitted together with the latest operation information after the communication failure is resolved, the certainty of information transfer is further enhanced.

Further, in the present embodiment, since the mounting portions 67 and 77 on which the SIM card is mounted are provided, the mobile communication device 11 can be used in a plurality of countries and regions, and the communication company selected by the user is used. be able to.

Further, in the present embodiment, since the operation information to be transmitted is encrypted, the security of the information is enhanced.

[Modification example]

In the above-described embodiment, an example in which the latest operation information and the operation information during the communication failure are both transmitted by UDP communication has been described. In this modified example, an example in which the latest operation information is transmitted by UDP communication and the operation information during a communication failure is transmitted by TCP communication will be described. The same configurations as those in the embodiment are designated by the same reference numerals as those in the embodiments, and the description thereof will be omitted.

The mobile communication device 11 of this modification includes the communication unit 100 shown in FIG. 6 instead of the communication unit 50 shown in FIG. The communication unit 100 includes a second transmission unit 52 in addition to the first transmission unit 51 described in the above embodiment.

The second transmission unit 52 includes a third communication modem 80 and a fourth communication modem 90. The third communication modem 80 and the fourth communication modem 90 transmit operation information during a communication failure by TCP communication.

The third communication modem 80 includes a third driver 81, a third output unit 82, a third radio wave strength detection unit 85, a third communication antenna 86, and a third mounting unit 87. The fourth communication modem 90 includes a fourth driver 91, a fourth output unit 92, a fourth radio wave intensity detection unit 95, a fourth communication antenna 96, and a fourth mounting unit 97.

The third driver 81 and the fourth driver 91 have the same configuration as the first driver 61 and the second driver 71. The third output unit 82 and the fourth output unit 92 have the same configuration as the first output unit 62 and the second output unit 72. However, the third output unit 82 includes a fifth port 83 and a sixth port 84 that perform TCP communication, and the fourth output unit 92 includes a seventh port 93 and an eighth port 94 that perform TCP communication. The third radio field strength detection unit 85 and the fourth radio wave strength detection unit 95 have the same configuration as the first radio wave strength detection unit 65 and the second radio wave strength detection unit 75. The third communication antenna 86 has the same configuration as the first communication antenna 66, and the fourth communication antenna 96 has the same configuration as the second communication antenna 76. The third mounting portion 87 and the fourth mounting portion 97 have the same configuration as the first mounting portion 67 and the second mounting portion 77.

The third communication modem 80 communicates with a band corresponding to the SIM card mounted on the third mounting unit 87 and a communication company. In the following, an example in which the third communication modem 80 communicates in the same first band as the first communication modem 60 will be described. The fourth communication modem 90 communicates with a band corresponding to the SIM card mounted on the fourth mounting unit 97 and a communication company. In the following, an example in which the fourth communication modem 90 communicates in the same second band as the second communication modem 70 will be described. However, the third communication modem 80 and the fourth communication modem 90 may communicate with a communication company different from the first communication company and the second communication company.

Of the third communication modem 80 and the fourth communication modem 90, the communication modem having the better radio wave condition is determined as the communication modem to be used. The determination of the communication modem is made in the same manner as in the above-described embodiment (FIG. 4).

In this modification, the latest operation information is obtained by UDP communication using the band having the better radio wave condition of the first communication modem 60 (first band) and the second communication modem 70 (second band). Will be sent. On the other hand, the operation information during the communication failure is obtained by using the band having the better radio wave condition among the third communication modem 80 (first band) and the fourth communication modem 90 (second band). It is transmitted by TCP communication.

Since the latest information is transmitted by UDP communication, the real-time property of communication is ensured. On the other hand, since the operation information during the communication failure is transmitted by TCP communication, the certainty of information transfer is ensured.

In the above-described embodiment, an example has been described in which the mobile communication device 11 includes two communication modems, a first communication modem 60 and a second communication modem 70. However, the mobile communication device 11 may include three or more communication modems. In this case, the control unit 40 of the mobile communication device 11 determines that a communication failure has occurred when all the communication modems cannot communicate, and executes the communication failure time processing shown in FIG. Further, the control unit 40 transmits operation information using the communication modem having the strongest radio wave strength among the communication modems capable of communicating.

Further, in the above-described embodiment, an example of determining the communication modem using both the response information and the radio wave intensity information has been described. However, the determination of the communication modem may be performed only by the signal strength information. In this case, the processing of the drivers 61, 71, 81, 91 and the control unit 40 can be simplified.

In the above-described embodiment and modification, an example in which the first communication modem 60, the second communication modem 70, the third communication modem 80, and the fourth communication modem 90 are provided with communication antennas 66, 76, 86, 96, respectively, will be described. It was. However, the first communication modem 60, the second communication modem 70, the third communication modem 80, and the fourth communication modem 90 may share one communication antenna.

In the above modification, the first communication modem 60 performs UDP communication, the third communication modem 80 performs TCP communication in the first band of the first communication company, and the second in the second band of the second communication company. An example in which the communication modem 70 performs UDP communication and the fourth communication modem 90 performs TCP communication has been described. However, the function of the third communication modem 80 may be added to the first communication modem 60, and the function of the fourth communication modem 90 may be added to the second communication modem 70. That is, in the first band of the first communication company, the first communication modem 60 performs UDP communication and TCP communication, and in the second band of the second communication company, the second communication modem 70 performs UDP communication and TCP communication. May be good.

10 ... Operation management system 11 ... Mobile communication device 12 ... Management server 12A ... Device memory 20 ... Vehicle 30 ... Information input unit 35 ... Clock module 40 ... Control Unit 41 ... Storage unit 50, 100 ... Communication unit 51 ... First transmission unit 52 ... Second transmission unit 60 ... First communication modem 61 ... First driver 63 ... 1st port 64 ... 2nd port 65 ... 1st radio field strength detection unit 66 ... 1st communication antenna 67 ... 1st mounting unit 70 ... 2nd communication modem 71 ... 2nd Driver 75 ... 2nd radio field strength detection unit 76 ... 2nd communication antenna 77 ... 2nd mounting unit 80 ... 3rd communication modem 90 ... 4th communication modem

Claims (8)

An information input unit that continuously inputs information other than voice, including at least the position information of the moving body,
A storage unit that stores the information input to the above information input unit,
The first band capable of transmitting the information stored in the storage unit by UDP communication in the first band for communication with the base station of the first communication company and the second band for communication with the base station of the second communication company. With the transmitter
A control unit that selects the band with the better communication state from the first band and the second band and transmits the latest information stored in the storage unit to the first transmission unit is provided. A mobile communication device mounted on a mobile body. Further provided with a radio wave intensity detecting unit for detecting the strength of the radio waves of the first band and the second band received by the antenna.
The mobile communication device according to claim 1, wherein the control unit selects a band having a stronger radio wave strength as a band having a better communication state, and transmits the latest information to the first transmission unit. The first transmitter is
Is it possible to communicate with the first communication antenna that receives the radio wave of the first band and the first radio wave strength detection unit that detects the strength of the radio wave of the first band received by the first communication antenna? A first communication modem that has a first driver that outputs communication status information including communication establishment information indicating whether or not to communicate with the base station of the first communication company, and a first communication modem that communicates with the base station of the first communication company.
Is it possible to communicate with the second communication antenna that receives the second band radio wave and the second radio wave strength detection unit that detects the strength of the second band radio wave received by the second communication antenna? It has a second driver that outputs communication status information including communication establishment information indicating whether or not, and includes a second communication modem that communicates with the base station of the second communication company.
The control unit
The communication status information is acquired from the first driver and the second driver, and the communication status information is acquired.
The mobile communication device according to claim 1, wherein the band in which communication is established and the radio wave strength is strong is selected as the band in which the communication state is good, and the latest information is transmitted to the first transmission unit. The first communication modem includes a first mounting portion on which a SIM card is mounted.
The mobile communication device according to claim 3, wherein the second communication modem includes a second mounting portion on which a SIM card is mounted. The control unit
The latest information stored in the storage unit is transmitted from the first port of the first transmission unit, and it is determined whether or not a communication failure has occurred. The mobile communication device according to any one of claims 1 to 4, wherein the information stored in the storage unit is transmitted from the second port of the first transmission unit during the period in which the above is generated. A second transmitter capable of transmitting the data stored in the storage unit using TCP communication is further provided.
The control unit
A communication failure occurs on condition that the latest information stored in the storage unit is transmitted using the first transmission unit, it is determined whether or not a communication failure has occurred, and it is determined that a communication failure has occurred. The mobile communication device according to any one of claims 1 to 4, wherein the information stored in the storage unit during the period of time is transmitted by using the second transmission unit. The mobile communication device according to any one of claims 1 to 6, wherein the control unit performs an encryption process for encrypting information stored in the storage unit. The mobile communication device according to any one of claims 1 to 7.
It is equipped with a management server into which information transmitted from the mobile communication device is input.
The mobile communication device further includes a clock module that outputs time information.
The storage unit stores identification symbols individually assigned to the mobile communication device, and stores the identification symbols.
The control unit stores the information in the storage unit in correspondence with the time information when the information is input, and associates the information with the time information and the identification symbol in the first transmission. Send from the department
The management server is an operation management system including a device memory that stores the information, the time information, and the identification symbol in association with each other.

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