JP2007028513A - Communication controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication controller which is simply constructed and by which disconnected communication can be surely reconnected, without performing reconnection many times. <P>SOLUTION: A navigation apparatus 100 which is mounted on a vehicle moves as the vehicle moves. The navigation apparatus 100 establishes data, communication with an information delivery server 200 via a mobile phone 10. When the mobile phone 10 fails to establish connection with a mobile phone line by radio waves, the navigation apparatus 100 instructs the mobile phone 10 to establish next reconnection, after the vehicle has moved a predetermined distance or larger. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a movable communication control apparatus.

  When a mobile communication device moves in a place with poor communication conditions such as a tunnel or a mountainous area, communication may be disconnected. In such a case, the communication status data indicating the wireless communication status of each position is held, the position of the mobile communication device is detected, the communication status data at the detected position is referenced, and the result of referring to the communication status data There has been known a mobile communication device that executes communication reconnection when it is determined that reconnection is possible (see Patent Document 1).

JP 2004-228851 A

  However, in the mobile communication apparatus as described above, it is necessary to hold communication status data indicating the wireless communication status corresponding to each position, and there is a problem that it takes time and cost to acquire the communication status data. .

  The present invention provides a communication control apparatus that reliably reconnects a line with a simple configuration without performing reconnection many times.

  The present invention is applied to a movable communication control apparatus, and a communication control apparatus for instructing connection of a line to a communication means using a wireless line, and a communication control apparatus from when the communication means cannot connect the line And a moving distance detecting means for detecting the moving distance moved by. The line connection instructing means determines whether or not the detected moving distance is equal to or greater than a predetermined distance, and if it is determined to be equal to or greater than the predetermined distance, instructs the communication means to connect the line.

  Since the present invention is configured as described above, it is possible to reliably reconnect a line with a simple configuration without performing reconnection many times.

  FIG. 1 is a diagram illustrating a configuration of an information providing system related to navigation. The information providing system includes a navigation device 100, a mobile phone 10, a communication line 20, an information distribution server 200, and the like. The navigation device 100 performs various navigation processes such as road map display and route guidance. The information distribution server 200 provides various types of information to the navigation device 100 via the communication line 20 and the mobile phone 10. The communication line 20 includes a cellular phone line network and a general telephone line network. That is, a wireless line and a wired line are included.

  The navigation device 100 is for in-vehicle use, and includes a control device 1, a current location detection device 2, a hard disk 3, a monitor 4, an input device 5, a communication interface 6, and the like. The control device 1 controls the entire navigation device 100 and includes a microprocessor and its peripheral circuits. The current location detection device 2 is composed of an orientation sensor that detects a traveling direction of a vehicle, a vehicle speed sensor that detects a vehicle speed, a GPS sensor that detects a GPS signal from a GPS (Global Positioning System) satellite, and the like. Detect your current location.

  The hard disk 3 stores various types of information such as programs processed by the navigation device 100 and map data used for navigation processing. The monitor 4 displays various information such as a road map, a recommended route, and an operation screen. The monitor 4 is composed of a liquid crystal panel (LCD) or the like. The input device 5 includes various switches that are operated to input a vehicle destination or the like in the navigation process, and is configured by a remote controller, for example. The communication interface 6 is an interface for connecting to wireless communication means such as the mobile phone 10.

  The navigation device 100 instructs the mobile phone 10 to connect a telephone line with the information distribution server 200 via the communication interface 6. The mobile phone 10 calls the telephone number of the telephone connected to the information distribution server 200 of the information center. When the connection of the telephone line is established, the navigation device 100 and the information distribution server 200 exchange various data via the mobile phone 10 and the communication line 20. For example, the navigation device 100 requests the information distribution server 200 to provide map data, and the information distribution server 200 provides the requested map data to the navigation device 100.

  In the present embodiment, since a wireless mobile phone line is used as a communication line, communication may be disconnected when a vehicle enters a tunnel or a valley of a building. That is, the communication line connection may fail. The navigation apparatus 100 according to the present embodiment is configured to appropriately reconnect when the communication line is disconnected as described above. This will be described in detail below.

  FIG. 2 is a diagram illustrating functional blocks of the navigation device 100. When the navigation device 100 is viewed from a functional aspect, a retransmission control unit 101 that controls retransmission processing, a communication control unit 102 that performs communication connection processing, a connection monitoring unit 103 that monitors the state of communication connection, and data in response to a communication request A communication result management unit 104 that manages success / failure of communication, a travel distance detection unit 105 that monitors a travel distance and notifies when a specified travel distance is reached, and a coefficient used to calculate a distance for reconnection The reconnection coefficient data 106 that holds the data and the application 107 that makes a data communication request. The reconnection coefficient data 106 indicates data stored in the hard disk 3, but other functions are realized by the control device 1 executing a program.

  FIG. 3 is a diagram illustrating a flowchart of control executed by the control device 1 of the navigation device 100. It is a figure explaining the flow of a process which performs data communication by the request | requirement of the application. When a request for data communication is generated from the application 107 to the communication control unit 102, the processing of FIG. 3, that is, communication is started. The application 107 is various navigation processes.

  In step S <b> 1, the communication control unit 102 instructs the mobile phone 10 to connect a line in order to connect to the information distribution server 200. In step S2, the connection monitoring unit 103 receives a signal from the mobile phone 10 via the communication control unit 102, and determines whether or not the mobile phone 10 has succeeded in line connection. If the line connection is successful, the process proceeds to step S3. If unsuccessful, the process proceeds to step S6.

  In step S <b> 3, the application 107 performs data communication with the information distribution server 200 via the communication control unit 102. In step S4, the connection monitoring unit 103 receives a signal from the mobile phone 10 via the communication control unit 102, and detects whether the data communication result is successful. Successful data communication results mean that data communication has ended normally, and failed data communication results mean that data communication has not ended normally due to disconnection of the communication line during data communication. . If the communication result is successful, the process proceeds to step S5. If the communication result is unsuccessful, the process proceeds to step S6.

  In step S5, the connection monitoring unit 103 notifies the communication result management unit 104 that the communication result is successful. The communication result management unit 104 records the communication result on the hard disk 3 and updates the road type coefficient 301, the peripheral type coefficient 302, and the mobile phone coefficient 303 of the retransmission connection coefficient 106. The update of the retransmission connection coefficient 106 will be described later.

  In step S6, the connection monitoring unit 103 notifies the communication result management unit 104 and the retransmission control unit 101 that communication connection has failed. The communication result management unit 104 records the communication result on the hard disk 3. In step S7, line reconnection processing is performed.

  FIG. 4 is a flowchart showing details of the line reconnection process in step S7 of FIG. In step S11, the retransmission control unit 101 calculates a reconnection distance. The reconnection distance is a vehicle movement distance reference value that may be reconnected after the communication line using the mobile phone 10 is disconnected. In the present embodiment, once the communication line is disconnected, it is determined whether or not the vehicle has moved a predetermined distance or more. When the vehicle has moved a predetermined distance or more, reconnection of the communication line is attempted. The reconnection distance is a predetermined distance in this case. The retransmission control unit 101 passes the calculated reconnection distance to the travel distance detection unit 105.

  In step S12, the travel distance detection unit 105 sets and records the current position (current position) of the vehicle detected by the current position detection device 2 as a measurement start position. In step S13, the travel distance detector 105 detects the current location of the vehicle from the current location detection device 2 as the vehicle travels, and sequentially calculates and records the travel distance (movement distance) from the set measurement start position. At this time, the travel distance is displayed on the monitor 4. In step S14, the travel distance detection unit 105 determines whether the travel distance (movement distance) of the vehicle is greater than the reconnection distance calculated in step S11. If it is determined that it is large, the process proceeds to step S15. If it is not large, the process proceeds to step S13 and the process is repeated.

  In step S15, the travel distance detection unit 105 notifies the retransmission control unit 101 to the effect that the vehicle has reached the distance for reconnection. The retransmission control unit 101 causes the communication control unit 102 to resume communication. That is, the mobile phone 10 is instructed to reconnect the communication line. In step S16, the connection monitoring unit 103 receives a signal from the mobile phone 10 via the communication control unit 102, and determines whether the mobile phone 10 has succeeded in the line reconnection. If the line reconnection is successful, the process is terminated. If the line reconnection is unsuccessful, the process proceeds to step S12 and the process is repeated.

Next, the calculation of the reconnection distance in step S11 of FIG. 4 will be described in detail. In the present embodiment, when calculating the reconnection distance, the calculation is performed in consideration of the communication environment of the vehicle or the navigation device 100, that is, the communication environment of the mobile phone 10. The retransmission control unit 101 first extracts from the retransmission connection coefficient data 106 a road type coefficient 301, a peripheral type coefficient 302, and a mobile phone coefficient 303 corresponding to the communication environment at that time. The retransmission control unit 101 calculates the reconnection distance using the reference distance, the road type coefficient 301, the peripheral type coefficient 302, and the mobile phone coefficient 303 as shown in the following equation.
Reconnection distance (m) = reference distance (m) x road type factor x peripheral environment factor x mobile phone factor

  FIG. 5 is a diagram illustrating specific examples of the road type coefficient 301, the peripheral type coefficient 302, and the mobile phone coefficient 303. In the road type coefficient 301 of FIG. 5A, the coefficient value decreases in the order of an expressway, a motorway, and a general road. The reason why the expressway has a larger coefficient value than the ordinary road is that the expressway is often in a place where radio waves of the mobile phone 10 are hard to reach compared to the ordinary road. That is, the reconnection distance on the highway is calculated to be larger than that on the general road. This is because in a place where radio waves are difficult to reach, it is better to reconnect the line after the vehicle has moved greatly.

  In the peripheral type coefficient 302 of FIG. 5B, the coefficient values decrease in the order of tunnel, mountain road, waterside, bridge, building district, and residential district. The reason why the coefficient value of the tunnel is the largest is that the tunnel is in the place where the radio wave is most difficult to reach. That is, similar to the road type coefficient 301, the reconnection distance is calculated to be larger in an environment where radio waves are hard to reach.

  In the cellular phone coefficient 303 of FIG. 5C, the coefficient is changed for each manufacturer and model of the cellular phone 10. This is because the radio reception sensitivity, the failure of connection, and the probability of disconnection of communication vary depending on the manufacturer and model of the mobile phone 10. The coefficient is determined in advance with reference to the experimental results and the specifications of each mobile phone. Coefficients of manufacturers and models that have poor wireless reception sensitivity or that are prone to connection failure and communication disconnection are increased.

  In the equation for obtaining the reconnection distance, three coefficients are multiplied. Thus, for example, the calculation is performed so that the total coefficient differs between when the highway is in a mountain and when it is in a residential area. This is because when the highway is in a residential area, the radio wave environment is considered to be relatively good, and it is better to make the coefficient smaller than the highway in the mountains.

  In addition, by referring to the map data stored in the hard disk 3 based on the current location of the vehicle detected by the current location detection device 2, it is possible to grasp the road type of the road on which the vehicle is currently traveling and the surrounding environment of the current location. it can. That is, the communication environment can be grasped. In addition, by exchanging commands between the communication control unit 102 and the mobile phone 10, it is possible to grasp the manufacturer and model of the connected mobile phone 10. In addition, since the navigation apparatus 100 and the mobile phone 10 move with the movement of the vehicle, it is determined that the navigation apparatus 100 and the mobile phone 10 are moving on the road grasped by referring to the map data. .

  Next, the update of the retransmission connection coefficient 106 in step S5 in FIG. 3 will be described. If the connection of the communication line has failed once in order to perform the data communication in step S3, or if disconnection has occurred even once in the communication of step S3, it is determined as a failure, and once during the connection and during the communication The case where such an event does not occur is regarded as a success. Note that a series of data communication exchanged in step S3 is a single data communication. Accordingly, a case where connection failure or communication disconnection never occurs in one data communication is regarded as successful, and a connection failure or communication disconnection occurs even once.

  In the case of success, the corresponding coefficients of the road type coefficient 301, the peripheral type coefficient 302, and the mobile phone coefficient 303 are decreased by, for example, 1%, and in the case of failure, the coefficient is increased by 1%. The corresponding coefficient is a coefficient corresponding to a road type, a peripheral type, and a mobile phone model when performing the data communication. FIG. 6 shows an example in which, when certain data communication is performed, the road type coefficient 301 is an expressway, the peripheral type coefficient 302 is a residential area, and the mobile phone coefficient 303 is a model Bbb of company A.

The navigation apparatus 100 and the information providing system of the present embodiment described above have the following excellent effects.
(1) When the mobile phone 10 cannot connect the line or when the line is disconnected during the communication, the next line is connected after the vehicle has moved a predetermined distance or more. Thereby, it is possible to reliably reconnect a connection failure or a communication disconnection with a simple configuration without performing reconnection many times. If the reconnection is performed many times due to the rules for using the mobile phone, the reconnection cannot be performed for a certain period. However, in this embodiment, such a problem does not occur.
(2) Since the next reconnection is determined based on the moving distance of the vehicle, it is possible to execute the reconnection after reliably exiting from a poor communication environment rather than using time. For example, even when driving slowly in a traffic jam, reconnection can be executed after the traffic jam is reliably exited.
(3) It is not necessary to have communication status data indicating the wireless communication status of each place, and it is not necessary to spend time and money on preparing such data. Further, there is no need to store such data in the navigation device 100, and the capacity of the hard disk 3 can be reduced.
(4) Considering the communication environment of the mobile phone 10 mounted on the vehicle, it is determined whether the vehicle has moved a predetermined distance or more, that is, whether the navigation device 100 mounted on the vehicle has moved a predetermined distance or more. . Thereby, according to the communication environment of the mobile telephone 10, reconnection is performed efficiently and reliably.
(5) Since the road type is considered as the communication environment, the reconnection is executed efficiently and reliably according to the road type. For example, highways are generally in places where radio waves are difficult to communicate, and general roads are often in places where radio waves are easily communicated. Therefore, by considering the road type, the reconnection distance of the expressway is calculated to be larger than that of the general road. As a result, reconnection is performed efficiently and reliably even in places where radio waves are generally difficult to communicate, such as highways. That is, the reconnection distance is set based on the characteristics of the communication environment at the place where the various roads are installed, and the determination accuracy of the reconnection determination is improved based on the environment where the vehicle is present.
(6) The speed of vehicles on highways and exclusive roads is faster than ordinary roads. Therefore, even if the vehicle travels a longer distance than a general road, it does not feel so long for the driver. For this reason, the reconnection distance on the expressway and the motorway is calculated so as to be larger than that on the general road, so that the highway and the motorway can surely get out of the bad communication environment. As a result, reconnection is efficiently and more reliably performed on a highway or a motorway.
(7) Since the surrounding environment is considered as the communication environment, reconnection is efficiently and reliably performed according to the surrounding environment. For example, it is conceivable that radio waves are difficult to reach in the surrounding environment in descending order of the coefficients shown in FIG. Even in a building district, radio waves may be difficult to reach in the valleys of buildings. On the other hand, in residential areas, there are few things that block radio waves, and the base stations that transmit radio waves of the mobile phone 10 are securely arranged, so that the radio waves are very easy to reach. By considering such a surrounding environment, reconnection is performed efficiently and reliably.
(8) Since the difference in the model of the mobile phone is considered as the communication environment, the reconnection is executed efficiently and reliably according to the difference in the model of the mobile phone. The difference in the model of the mobile phone referred to in this specification is a concept including a difference in the manufacturer of the mobile phone and a difference in the communication method of each mobile phone. In general, the reception sensitivity, the probability of communication errors, and the like differ depending on the type of mobile phone. In other words, the performance of difficulty in connection failure and communication disconnection is different. Therefore, the coefficient is increased and the reconnection distance is calculated to be larger for models with poor reception sensitivity and models for which communication errors are likely to occur. As a result, models with poor reception sensitivity and models that are more susceptible to communication errors will move away from the current poor communication environment before reconnection is performed. Connection is performed.
(9) Since the coefficient corresponding to each communication environment is set in advance and stored in the hard disk 3, the coefficient corresponding to the current communication environment is read and simply multiplied to calculate the reconnection distance. The difference between the two can be reflected reliably with a simple calculation. As a result, efficient and reliable reconnection is performed.
(10) Since the moving distance of the vehicle after the communication connection failure or the communication disconnection is displayed, the distance to the reconnection can be predicted for the user, and convenience is improved.
(11) The road type coefficient 301, the peripheral type coefficient 302, and the mobile phone coefficient 303 of the retransmission connection coefficient 106 are updated depending on whether the communication result is successful or unsuccessful. Judgment will be made in a more realistic way.

  In the above-described embodiment, the example in which the road type coefficient 301, the peripheral type coefficient 302, and the mobile phone coefficient 303 of the retransmission connection coefficient 106 are used has been described, but it is not necessarily limited to this content. Any one of the coefficients may be used, or two may be combined. In the case of combining the two, even if the judgment based on the use of one coefficient is different from the actual communication environment, the other judgment can be supplemented and the reconnection judgment accuracy is improved.

  In particular, when the road type coefficient 301 and the peripheral type coefficient 302 are used, the communication environment differs between when the highway is in a residential area and when it is in a mountain, but it can be reflected reliably. In addition, the mobile phone coefficient 303 is always used, and either the road type coefficient 301 or the surrounding type coefficient 302 may be used. As a result, reconnection determination can be made in consideration of a communication environment that cannot be determined in the road and the surrounding environment, and determination accuracy is improved.

  In the above-described embodiment, the example of displaying the travel distance (movement distance) of the vehicle after the communication connection failure or the communication disconnection has been described. However, the present invention is not necessarily limited to this content. The remaining distance obtained by subtracting the travel distance from the predetermined distance may be displayed. FIG. 7 is a diagram illustrating an example of displaying the remaining distance until reconnection. As shown in FIG. 7, “xxm until reconnection” is displayed in the upper left 31 of the screen. The remaining distance indicates the distance from the current location of the vehicle indicated by the vehicle mark 32 to the point to be reconnected. Thereby, the distance to reconnection can be directly grasped, and convenience is further improved.

  In the above embodiment, an example in which reconnection is performed after the vehicle has moved a predetermined distance has been described. However, by providing the input device 5 with a switch function for reconnection, a reconnection instruction may be made according to an operation instruction of a user (operator). This makes it possible to instruct execution of reconnection regardless of whether the vehicle has moved a predetermined distance. This is because the user may be able to determine that reconnection is possible by looking at the surrounding environment.

  In the above embodiment, an example has been described in which the road type coefficient 301, the peripheral type coefficient 302, and the mobile phone coefficient 303 of the retransmission connection coefficient 106 are used when calculating the reconnection distance, but the present invention is not necessarily limited to this content. There is no need. The predetermined distance may be corrected using a coefficient. In this case, the relationship is opposite to the coefficient used for the reconnection distance. For example, the coefficient of the expressway is set to be smaller than the coefficient of the general road.

  In the above embodiment, the road type coefficient 301, the peripheral type coefficient 302, and the mobile phone coefficient 303 of the retransmission connection coefficient 106 have been described as examples of updating the coefficient in units of 1% according to the success of communication failure. However, it is not necessarily limited to this content. The update change amount of the coefficient may be adjusted according to the frequency of failure. Further, the coefficient may be updated not by the ratio but by the absolute value.

  In the above embodiment, an example of the navigation device 100 mounted on a vehicle has been described, but it is not necessarily limited to this content. A portable navigation device may be used. Moreover, it is not necessarily limited to the navigation device. That is, the present invention can be applied to general communication control of a movable device that communicates via a wireless line.

  In the above embodiment, an example of the mobile phone 10 has been described as a communication means using a wireless line, but it is not necessarily limited to this content. Other wireless communication means may be used. Further, the mobile phone 10 and other wireless communication means do not necessarily have to be externally attached to the apparatus. That is, they may be built in the apparatus.

  In the above-described embodiment, the example in which the program executed by the control device 1 is already stored in the hard disk 3 has been described. However, the present invention is not necessarily limited to this content. A program may be received from an application server or the like via the communication interface 6 and the mobile phone 10. Alternatively, the program may be received via the Internet via the mobile phone 10. Further, a DVD or CD-ROM drive device may be provided in the navigation device 100 and a program may be received from a recording medium such as a DVD or CD-ROM. In this case, the map data can also be provided from the recording medium.

  Although various embodiments and modifications have been described above, the present invention is not limited to these contents. Other embodiments conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention.

  Hereinafter, the correspondence between the constituent elements of the claims and the constituent elements of the above-described embodiment will be described. The line connection instruction means corresponds to the control device 1 and the communication interface 6, the movement distance detection means corresponds to the current location detection device 2 and the control device 1, the coefficient storage means corresponds to the hard disk 3, and the coefficient update means corresponds to the control device 1. The display means corresponds to the monitor 4 and the control device 1, the operation means corresponds to the input device 5, the information acquisition means corresponds to the control device 1, and the navigation processing means corresponds to the control device 1. The description of this association is merely an example, and the present invention is not construed as being limited to this association.

It is a figure which shows the structure of the information provision system regarding navigation. 2 is a diagram showing functional blocks of the navigation device 100. FIG. It is a figure which shows the flowchart of the control which the control apparatus 1 of the navigation apparatus 100 performs. It is a figure which shows the detailed flowchart of the line | wire reconnection process of step S7 of FIG. It is a figure which shows the specific example of the road classification coefficient 301, the periphery classification coefficient 302, and the mobile telephone coefficient 303. FIG. It is a figure which shows the example of the update of the road classification coefficient 301, the periphery classification coefficient 302, and the mobile telephone coefficient 303. FIG. It is a figure which shows the example which displays the remaining distance until reconnection.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Control apparatus 2 Present location detection apparatus 3 Hard disk 4 Monitor 5 Input apparatus 6 Communication interface 10 Cellular phone 20 Communication line 100 Navigation apparatus 200 Information distribution server

Claims (12)

A movable communication control device,
Line connection instruction means for instructing communication means using a wireless line to connect the line;
A moving distance detecting means for detecting a moving distance moved by the communication control device since the communication means could not connect the line;
The line connection instructing unit determines whether or not the detected moving distance is a predetermined distance or more, and instructs the communication unit to connect a line if it is determined to be the predetermined distance or more. The communication control device according to claim 1,
The communication control apparatus according to claim 1, wherein the line connection instruction means considers a communication environment of the communication means when determining whether or not the detected moving distance is a predetermined distance or more. In the communication control device according to claim 1 or 2,
The line connection instructing means includes, as a communication environment of the communication means, a road type of the road where the communication control apparatus is determined to be moving, a surrounding environment where the communication control apparatus is located, a model of the communication means A communication control apparatus characterized by considering at least one of the differences. The communication control device according to claim 3.
The communication control apparatus, wherein the line connection instruction means considers at least the road type and the surrounding environment as a communication environment of the communication means. The communication control device according to claim 3.
The line connection instruction means considers a difference in model of the communication means as a communication environment of the communication means, and further considers at least one of the road type and the surrounding environment. apparatus. In the communication control device according to any one of claims 3 to 5,
When the road type is considered, the coefficient according to the road type, when the surrounding environment is considered, the coefficient according to the surrounding environment, when the difference in the model of the communication means is considered Coefficient storage means for storing coefficients corresponding to differences in the types of communication means, respectively.
The line connection instruction means obtains a coefficient from the coefficient storage means according to the communication environment of the communication means, and multiplies the obtained distance by the obtained coefficient to either the movement distance or the predetermined distance. A communication control apparatus characterized by changing any of the values. The communication control device according to claim 6,
When there is an event that the communication means cannot connect the line, the coefficient stored in the coefficient storage means corresponding to the communication environment at that time is changed to a value with a larger predetermined distance. Alternatively, the communication control apparatus further comprises coefficient updating means for updating the moving distance so as to be changed to a smaller value. In the communication control device according to any one of claims 1 to 6,
The communication control apparatus further comprising display means for displaying the movement distance. In the communication control device according to any one of claims 1 to 6,
The communication control apparatus further comprising display means for displaying a remaining distance up to the predetermined distance based on the moving distance. In the communication control device according to any one of claims 1 to 9,
Further comprising an operation means for enabling an instruction to connect the line by an operation of an operator;
The line connection instructing unit instructs a line connection when the operation unit is operated by the operator regardless of whether the detected moving distance is a predetermined distance or more. Control device. A navigation device,
The communication control device according to any one of claims 1 to 9,
An information acquisition means for connecting to an external device via the communication control device and acquiring information from the external device;
A navigation device comprising navigation processing means for performing navigation processing including display of a map using information acquired by the information acquisition means. A communication control method for a movable device, comprising:
Instructing communication means using a wireless line to connect the line,
Detecting the distance traveled by the device since the communication means could not connect the line,
Determining whether the detected moving distance is greater than or equal to a predetermined distance;
When determining that the moving distance is equal to or greater than the predetermined distance, the communication control method is configured to instruct the communication means to connect a line.

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