JP2014178256A - Navigation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a navigation device that enables a route of excellent communication quality to be accurately provided.SOLUTION: When a call conversation by a cellular phone 2 is scheduled on the way to a destination, on the basis of cellular phone information stored in an information DB 7, and a model of the cellular phone 2, a communication method thereof, reception radio wave intensity corresponding to a location of a vehicle, a running speed of the vehicle and a running direction thereof included in vehicle information, the location of the vehicle and a status of the vehicle in which the reception radio wave intensity based on the model of the cellular phone 2 for use in the call conversation and the communication method thereof is less than a predetermined threshold value are excluded, a route to the destination is searched for that has excellent conversation quality of calls by the cellular phone 2 expected, and the route to the destination is guided.

Description

  The present invention relates to a navigation device capable of making a call with a call partner via a mobile phone.

  For example, Patent Documents 1 and 2 store radio wave reception levels (reception field strengths) in association with position information, and use this stored information to route routes when a hands-free call is made via a mobile phone. A navigation device that searches and guides it is disclosed. In this way, good call quality is ensured in a hands-free call performed while the vehicle equipped with the navigation device is running.

JP 2002-291848 A JP 2008-203040 A

In the conventional techniques represented by Patent Documents 1 and 2, a route in which good call quality is expected is searched using a radio wave reception level associated with position information.
However, even when the radio wave reception level of the mobile phone is high and the radio wave condition is good, if the vehicle is near the boundary of the communication area of multiple base stations, it is good due to the influence of handover that switches the communication area May not be able to maintain a good call quality.
In addition, when there is a lot of error correction or when the S / N ratio is good even in a radio wave situation where the received electric field strength is weak, good call quality can be ensured, and the received electric field strength is not always effective as an indicator of call quality. There are cases.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a navigation device that can accurately present a route with good call quality.

  The navigation device according to the present invention is a navigation device mounted on a mobile body and capable of making a call by connecting to a mobile phone. Mobile phone information including mobile phone model information, communication method, and received radio wave intensity of the mobile phone. A mobile phone information collecting unit for collecting, a mobile body information collecting unit for collecting mobile body information including a moving speed and a moving direction of the mobile body, and storing mobile phone information and mobile body information in association with the position of the mobile body Information stored in the storage unit by comparing the newly collected information with the information stored in the storage unit each time the information is collected by the storage unit, the mobile phone information collection unit, and the mobile information collection unit Mobile phone information and mobile unit information stored in the storage unit when there is a mobile phone call between the comparison unit that updates and adds information and a mobile phone between the destination and the destination Based on the model of communication, communication method, received radio wave intensity corresponding to the position of the moving body, moving speed and moving direction of the moving body, the received radio wave intensity is less than a predetermined threshold in the mobile phone model and communication method used for the call. A route search unit that searches for a route to a destination where good call quality is expected on a mobile phone by excluding the position and state of the mobile unit that has become mobile, and a route to the destination searched by the route search unit And a route guide unit for guiding.

  According to the present invention, there is an effect that a route with good call quality can be presented accurately.

It is a block diagram which shows the structure of the navigation apparatus concerning this invention. 3 is a block diagram illustrating a configuration of a control unit of the navigation device according to Embodiment 1. FIG. It is a flowchart which shows the operation | movement of addition or update of an information database. 5 is a flowchart showing route search and guidance with good call quality in the first embodiment. 6 is a block diagram showing a configuration of a control unit of a navigation device according to Embodiment 2. FIG. 10 is a flowchart showing a process of presenting a traveling state and a moving place of a vehicle in which call quality recovery is expected in the second embodiment. 14 is a flowchart showing processing for presenting a mobile phone with good call quality and a route according to the third embodiment. 12 is a flowchart illustrating another example of a process of presenting a mobile phone with good call quality and a route according to the third embodiment.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing a configuration of a navigation apparatus according to the present invention. A navigation device 1 shown in FIG. 1 is a navigation device that is connected to a mobile phone 2 and that allows a hands-free call with a call partner via the mobile phone 2 using a microphone 3 and a speaker 4. The navigation device 1 is mounted on a moving body (for example, a vehicle) and connected to a vehicle sensor 5 that detects the state of the vehicle.
The vehicle sensor 5 may be any sensor that can detect vehicle movement information, and includes at least a vehicle speed sensor and a direction sensor.

The control unit 6 is configured mainly with a microcomputer, and performs processing such as detection of the current position, route search, and route guidance by executing a program in which navigation processing is described.
An information database (hereinafter referred to as DB) 7 is a database in which mobile phone information related to the mobile phone 2 and vehicle information related to the vehicle are registered in association with the position of the vehicle. The information DB 7 is stored in a storage device mounted on the navigation device 1.
As the storage device, a device such as a hard disk device or a USB memory capable of freely reading and writing information is used.

FIG. 2 is a block diagram illustrating a configuration of the control unit of the navigation device according to the first embodiment, and illustrates a functional configuration of the control unit 6 of FIG. 1. As shown in FIG. 2, the control unit 6 includes a communication connection / information collection unit 60, a vehicle information collection unit 61, a comparison unit 62, a route search unit 63, and a route guide unit 64. The communication connection / information collection unit 60 connects to the mobile phone 2 to relay call processing, and also collects mobile phone information including the model information of the mobile phone 2, the communication method, and the received radio wave intensity of the mobile phone 2. It is a telephone information collection unit.
Further, the communication connection / information collection unit 60 may collect the degree of occurrence of sound interruption and error correction information in the mobile phone 2 in a call state as information indicating the call quality included in the mobile phone information. Thus, by collecting the degree of sound interruption occurrence and the error correction information directly related to the call quality, it is possible to accurately search for a path where good call quality is expected.

The vehicle information collecting unit 61 is a moving body information collecting unit that is connected to the vehicle sensor 5 and collects vehicle information (moving body information) including the traveling speed and traveling direction of the vehicle.
Each time the communication connection / information collection unit 60 and the vehicle information collection unit 61 collect information, the comparison unit 62 compares the newly collected information with the information stored in the information DB 7 and stores the information in the information DB 7. Update information and add information.

  The route search unit 63 is a route search unit that searches for a route to the destination using the current position of the vehicle and map data collected by the communication connection / information collection unit 60 or the vehicle information collection unit 61. In addition, the route search unit 63 according to the present invention provides the mobile phone 2 included in the mobile phone information and the vehicle information stored in the information DB 7 when the mobile phone 2 is scheduled to make a call before reaching the destination. Based on the model, communication method, received radio wave intensity corresponding to the position of the vehicle, traveling speed and traveling direction of the vehicle, the received radio wave intensity is less than a predetermined threshold in the model and communication system of the mobile phone 2 used for the call. The route to the destination where good call quality is expected on the mobile phone 2 is searched by excluding the position and vehicle state of the vehicle. The route guide unit 64 is a route guide unit that guides the route to the destination searched by the route search unit 63.

  Note that the vehicle information collection unit 61, the comparison unit 62, the route search unit 63, and the route guide unit 64 are implemented by the microcomputer constituting the control unit 6 by executing a program relating to processing unique to the present invention. It is realized as a concrete means that software and software cooperate.

Next, the operation will be described.
First, a process for accumulating information in the information DB 7 will be described.
FIG. 3 is a flowchart showing the operation of adding or updating the information DB 7. In FIG. 3, the communication connection / information collection unit 60 collects mobile phone information including the model information of the mobile phone 2, the communication method, and the received radio wave intensity of the mobile phone 2 from the mobile phone 2 connected to the navigation device 1. . The vehicle information collection unit 61 is connected to the vehicle sensor 5 and collects vehicle information (moving body information) including the traveling speed and traveling direction of the vehicle. The process so far corresponds to the process of step ST1 in FIG.

Next, each time the communication connection / information collection unit 60 and the vehicle information collection unit 61 collect information, the comparison unit 62 compares the newly collected information with the information stored in the information DB 7 (step ST2). ). Here, when the past information corresponding to the newly collected information is in the information DB 7, the comparison unit 62 updates the information stored in the information DB 7 with the newly collected information (step ST3).
If past information corresponding to the newly collected information is not present in the information DB 7, the comparison unit 62 adds the newly collected information to the information DB 7 (step ST4).

Next, a route search to a destination where the call quality of the hands-free call is good will be described.
FIG. 4 is a flowchart showing route search and guidance with good call quality in the first embodiment.
First, the route search unit 63 determines whether there is a call schedule such as a hands-free call using the mobile phone 2 (step ST1a). For example, the determination is made based on whether or not the user has set a call schedule using an input unit (not shown).
When there is no scheduled call (step ST1a; NO), the route search unit 63 performs a route search according to the normal mode setting (step ST2a). For example, the route to the destination is searched in the time priority mode in which the travel time is minimum or the distance priority mode in which the travel distance is minimum.

  When there is a call schedule (step ST1a; YES), the route search unit 63 acquires information (for example, model information) for specifying the mobile phone 2 used for the call from the communication connection / information collection unit 60, and sends the information to the mobile phone 2. It is confirmed whether or not corresponding past information exists in the information DB 7 (step ST3a). If there is no corresponding information in the information DB 7 (step ST3a; NO), the process proceeds to step ST2a. In this case, the comparison unit 62 executes the information accumulation process in the information DB 7 shown in FIG. 3 while the vehicle is traveling.

When the corresponding past information is in the information DB 7 (step ST3a; YES), the route search unit 63 reads information corresponding to the mobile phone 2 used for the call from the information DB 7, and uses this information to consider the call quality A route to the ground is searched (step ST4a).
Here, the mobile phone used for a call based on the model, communication method, received radio wave intensity corresponding to the position of the vehicle, the traveling speed and the traveling direction of the mobile phone 2 included in the past information of the mobile phone information and the vehicle information. The mobile phone 2 searches for a route to a destination where good call quality is expected by excluding the vehicle position and vehicle state where the received radio wave intensity is less than a predetermined threshold in the model 2 and communication method. For example, a route candidate corresponding to a normal mode setting is searched, and a vehicle position where the received radio wave intensity is less than a predetermined threshold in the model and communication method of the mobile phone 2 used for the call among the route candidates of the search result and Candidates including positions on and around the route related to the vehicle state are excluded.

  When the process of step ST2a or step ST4a is completed, the route guidance unit 64 performs route guidance for the route searched by the route search unit 63 (step ST5a). For example, a route is displayed on the map screen and voice guidance is performed.

  As described above, according to the first embodiment, the communication connection / information collecting unit 60 that collects mobile phone information including the model information of the mobile phone 2, the communication method, and the received radio wave intensity of the mobile phone 2, and the vehicle Vehicle information collection unit 61 that collects vehicle information including the travel speed and travel direction, information DB 7 that stores mobile phone information and vehicle information in association with the vehicle position, communication connection / information collection unit 60, and vehicle Each time the information collection unit 61 collects information, the newly collected information and the information stored in the information DB 7 are compared to update the information stored in the information DB 7 and add information. When there is a plan to make a call on the mobile phone 2 before reaching the destination, it corresponds to the mobile phone information stored in the information DB 7 and the mobile phone 2 model, communication method, and vehicle position included in the vehicle information. On the basis of the received radio wave intensity, the traveling speed and the traveling direction of the vehicle, the mobile phone 2 used for the call is excluded from the position and vehicle state of the vehicle where the received radio wave intensity is less than a predetermined threshold in the model and communication method. A route search unit 63 for searching for a route to a destination where good call quality is expected on the telephone 2 and a route guide unit 64 for guiding a route to the destination searched by the route search unit 63 are provided. By doing so, it is possible to accurately present a route where good call quality is expected, avoiding places where the call quality may deteriorate, such as a valley of a building.

  Further, according to the first embodiment, the communication connection / information collecting unit 60 collects the degree of occurrence of sound interruption and error correction information in the mobile phone 2 in a call state as information indicating the call quality included in the mobile phone information. To do. As described above, by collecting the degree of sound interruption occurrence and the error correction information directly related to the call quality, it is possible to accurately search for a route for which good call quality is expected.

Embodiment 2. FIG.
When the route guidance to the destination is not set, the navigation device according to Embodiment 2 indicates to the user the location and vehicle state where the call quality is expected to be restored when the call quality deteriorates while the vehicle is running. Present. Thereby, even if the call quality deteriorates, it can be recovered immediately.

  FIG. 5 is a block diagram illustrating a configuration of the control unit of the navigation device according to the second embodiment, and illustrates a functional configuration of the control unit 6A. As shown in FIG. 5, the control unit 6A includes a communication connection / information collection unit 60, a vehicle information collection unit 61, a comparison unit 62, a route search unit 63A, and a route guide unit 64A. In FIG. 5, the same components as those in FIG.

The route search unit 63A corresponds to the model, communication method, and vehicle position of the mobile phone 2 included in the mobile phone information and the vehicle information stored in the information DB 7 when the call quality deteriorates during the call of the mobile phone 2. Based on the received radio field strength, the traveling speed and the traveling direction of the vehicle, the position and vehicle state of the vehicle where the received radio field strength exceeds a predetermined threshold in the model and communication method of the mobile phone 2 used for the call are Search for places and vehicle conditions where recovery is expected.
The route guide unit 64A presents the location and vehicle state searched by the route search unit 63A to the user. For example, a list of location candidates searched by the route search unit 63A on the display screen or a comparison of the received radio wave intensity with past information and the vehicle such as the traveling speed and traveling direction of the vehicle with better call quality than the current one. Present the status.

Next, the operation will be described.
FIG. 6 is a flowchart showing a process of presenting a running state and a moving place of a vehicle that is expected to recover call quality in the second embodiment.
The mobile phone 2 is connected to the navigation device according to the second embodiment, and a hands-free call is performed while the vehicle equipped with the navigation device is traveling (step ST1b).
At this time, the communication connection / information collection unit 60 collects the degree of occurrence of sound interruption and error correction information in the mobile phone 2 in a call state. The mobile phone information is input from the communication connection / information collection unit 60 to the route search unit 63A.

The route search unit 63A determines whether or not the call quality has deteriorated based on the mobile phone information related to the call quality of the mobile phone 2 input from the communication connection / information collection unit 60 (step ST2b). For example, the degree of sound interruption or the error correction information indicated by the mobile phone information is compared with an allowable threshold value, and it is determined that the communication quality has deteriorated when these values fall below the allowable threshold value.
Here, if the communication quality does not deteriorate (step ST2b; NO), the process is terminated, and the process of FIG. 6 is repeated until the call is terminated.

When the communication quality deteriorates (step ST2b; YES), the route search unit 63A acquires information (for example, model information) for specifying the mobile phone 2 used for the call from the communication connection / information collection unit 60, and this mobile phone 2 It is confirmed whether the past information corresponding to is in the information DB 7 (step ST3b). Here, when there is no corresponding information in the information DB 7 (step ST3b; NO), the process is terminated, and the process of FIG. 6 is repeated until the call is terminated.
In this case, the comparison unit 62 executes information accumulation processing in the information DB 7 shown in FIG. 3 of the first embodiment while the vehicle is traveling.

  When the corresponding past information is in the information DB 7 (step ST3b; YES), the route search unit 63A reads the past information corresponding to the mobile phone 2 used for the call from the information DB 7, and the vehicle associated with the past information. And the current position of the vehicle input from the vehicle information acquisition unit 61 are checked to determine whether there is past information within a short distance from the vehicle (step ST4b). Note that the short-distance range indicates the communication area of the base station where the mobile phone 2 is currently talking, and the middle-distance range is adjacent to the communication area of the base station where the mobile phone 2 is currently talking. A communication area including a communication area to be transmitted or a distant communication area is shown.

When there is past information within a short distance from the vehicle (step ST4b; YES), the route search unit 63A corresponds to the model, communication method, and position of the mobile phone 2 included in the past information within a short distance from the vehicle. Based on the received radio wave intensity, the traveling speed and the traveling direction of the mobile phone 2, the call quality can be restored to the position and vehicle state of the vehicle in which the received radio wave intensity has previously exceeded a predetermined threshold in the model and communication method of the mobile phone 2. Search as expected location and vehicle status.
The route guidance unit 64A presents the location and vehicle state searched by the route search unit 63A to the user (step ST5b). For example, a list of location candidates searched by the route search unit 63A is displayed or displayed on a map screen, or the vehicle state such as the traveling speed and traveling direction of the vehicle in which the call quality is better than the present is presented.

On the other hand, when there is no past information in the short distance range from the vehicle in the information DB 7 (step ST4b; NO), the route search unit 63A searches the past information in the middle / long distance range from the information DB 7 (step ST6b). As a result, a communication area adjacent to the communication area of the base station with which the mobile phone 2 is currently talking or a further distant communication area is determined.
Next, the route guidance unit 64A confirms that the vehicle should move to a communication area adjacent to the communication area of the base station with which the mobile phone 2 searched by the route search unit 63A is currently talking, or to a further communication area. Present (step ST7b). For example, each communication area is displayed separately on the map screen, and if moving to an adjacent communication area, it is displayed or voice guidance that the call quality is expected to be restored.

  As described above, according to the second embodiment, the route search unit 63A is included in the mobile phone information and the vehicle information stored in the information DB 7 when the call quality deteriorates during the call of the mobile phone 2. Based on the mobile phone 2 model, communication method, received radio wave intensity corresponding to the position of the vehicle, the traveling speed and traveling direction of the vehicle, the received radio wave intensity is a predetermined threshold in the mobile phone 2 model and communication method used for the call. The position and state of the vehicle as described above are searched as a place and a vehicle state where the call quality is expected to be restored, and the route guidance unit 64A presents the location and vehicle state searched by the route search unit 63A to the user. In this way, even if the call quality deteriorates while the vehicle is running, it can be recovered immediately.

  Further, according to the second embodiment, the communication connection / information collection unit 60 collects the degree of occurrence of sound interruption and error correction information in the mobile phone 2 in a call state as information indicating the call quality included in the mobile phone information. To do. As described above, by collecting the degree of occurrence of sound interruption directly related to the call quality and the error correction information, it is possible to accurately search a place and a vehicle state where a good call quality is expected.

Embodiment 3 FIG.
In the navigation device according to the third embodiment, the mobile phone 2 having the best call quality on the travel route of the vehicle among the plurality of types of mobile phones 2 is determined, and the mobile phone 2 and the call quality corresponding thereto are determined. The route to a good destination is presented to the user.
Since the control unit of the navigation device according to the third embodiment has basically the same function as the configuration of FIG. 2 shown in the first embodiment, refer to FIG. 2 for the functional configuration in the following description.

Next, the operation will be described.
FIG. 7 is a flowchart showing a process of presenting a mobile phone with good call quality and a route in the third embodiment.
First, the route search unit 63 determines whether there is a call schedule such as a hands-free call using the mobile phone 2 as in the first embodiment (step ST1c).
Here, when there is no call schedule (step ST1c; NO), the route search unit 63 performs route search according to the normal mode setting (step ST2c). Thereafter, the route guidance unit 64 performs route guidance for the route searched by the route search unit 63 (step ST6c).

When there is a call schedule (step ST1c; YES), the route searching unit 63 uses information (for example, model information) for identifying each of the plurality of types of mobile phones 2 acquired from the communication connection / information collecting unit 60. The past information corresponding to each of the mobile phones 2 is read from the information DB 7, and the route to the destination considering the call quality is searched using the past information (step ST3c). Here, as in the first embodiment, the mobile phone 2 model, communication method, received radio wave intensity corresponding to the vehicle position, vehicle travel speed and travel direction are included in the mobile phone information and vehicle information past information. Based on the model and communication method of the mobile phone 2 used for the call, up to a destination where good call quality is expected on the mobile phone 2 excluding the vehicle position and vehicle state where the received radio wave intensity is less than a predetermined threshold Search for a route.
For example, a route candidate corresponding to a normal mode setting is searched, and a vehicle position where the received radio wave intensity is less than a predetermined threshold in the model and communication method of the mobile phone 2 used for the call among the route candidates of the search result and Candidates including positions on and around the route related to the vehicle state are excluded.

Next, the route search unit 63 selects a route with the best communication quality from the route candidates searched in step ST3c and the mobile phone 2 corresponding to the route (step ST4c).
For example, the route having the smallest position on and around the route related to the vehicle position and vehicle state where the received radio wave intensity is less than a predetermined threshold is selected as the route with the best communication quality.

  Thereafter, the route guide unit 64 presents the route searched by the route search unit 63 and the mobile phone 2 corresponding thereto to the user (step ST5c). When the user approves the route search result using an input unit (not shown), the route guide unit 64 performs route guidance for the route searched by the route search unit 63 (step ST6c). Thus, when multiple types of mobile phones 2 are registered in advance, out of the multiple types of mobile phones 2, the mobile phone 2 that is expected to have good call quality on the route to the destination is accurately selected. Can do.

In FIG. 7, the route having the best communication quality and the corresponding mobile phone 2 are automatically selected from a plurality of types of mobile phones 2, but the mobile phone 2 and the corresponding route are selected by the user. May be individually selected.
FIG. 8 is a flowchart showing another example of a process of presenting a mobile phone with good call quality and a route according to the third embodiment. The user individually selects the mobile phone 2 and the route corresponding thereto. Show.
First, the route search unit 63 determines whether there is a call schedule such as a hands-free call using the mobile phone 2 as in the first embodiment (step ST1d).
Here, when there is no call schedule (step ST1d; NO), the route search unit 63 performs route search according to the normal mode setting (step ST2d). Thereafter, the route guidance unit 64 performs route guidance for the route searched by the route search unit 63 (step ST7d).

When there is a call schedule (step ST1d; YES), the route search unit 63 selects a device that has not yet been searched for a route for which good call quality is expected, from a plurality of types of mobile phones 2 registered in advance. Confirm (step ST3d).
Here, if there is no unexecuted mobile phone 2 (step ST3d; NO), the route guidance unit 64 performs route guidance of the route searched by the route search unit 63 so far (step ST7d).

On the other hand, when there is an unexecuted mobile phone 2 (step ST3d; YES), the route search unit 63 sequentially reads past information corresponding to a plurality of types of mobile phones 2 from the information DB 7, and uses this past information to call quality. A route to the destination considering the above is searched (step ST4d).
The search method is the same as step ST3c in FIG.
Next, the route guidance unit 64 presents the route searched by the route search unit 63 and the mobile phone 2 corresponding thereto to the user (step ST5d).
When the user instructs a re-search using an input unit (not shown) (step ST6d; YES), the process returns to step ST3d, reads past information corresponding to the next mobile phone 2 from the information DB 7, and repeats the above processing. .

When the user approves the search result (step ST6d; NO), the route guidance unit 64 performs route guidance for the route searched by the route search unit 63 (step ST7d).
Thus, when multiple types of mobile phones 2 are registered in advance, out of the multiple types of mobile phones 2, the mobile phone 2 that is expected to have good call quality on the route to the destination is accurately selected. Can do.

  As described above, according to the third embodiment, the information DB 7 stores the mobile phone information and the vehicle information in association with the position of the vehicle in accordance with each of the plurality of types of mobile phones 2, and the route search Based on the mobile phone information and the mobile body information stored in the information DB 7, the unit 63 searches for a route where good call quality is expected in each of the plurality of types of mobile phones 2, and the route guide unit 64 The route searched by the search unit 63 and the mobile phone 2 corresponding thereto are presented to the user. By doing in this way, it is possible to accurately select the mobile phones 2 that are expected to have good call quality on the route to the destination among the plural types of mobile phones 2.

  In the first to third embodiments, the case where the moving body is a vehicle has been shown. However, the navigation apparatus according to the present invention is a navigation apparatus for a moving body including a person, a vehicle, a railway, a ship, an aircraft, etc. This is a navigation device suitable for being brought into a vehicle or mounted on a vehicle.

  In the present invention, within the scope of the invention, any combination of each embodiment, any component of each embodiment can be modified, or any component can be omitted in each embodiment. .

  1 navigation device, 2 mobile phone, 3 microphone, 4 speaker, 5 vehicle sensor, 6, 6A control unit, 7 information DB, 60 communication connection / information collection unit, 61 vehicle information collection unit, 62 comparison unit, 63, 63A route Search unit, 64, 64A route guide unit.

Claims (4)

In a navigation device that is mounted on a mobile body and can be connected to a mobile phone to make a call,
A mobile phone information collection unit for collecting mobile phone information including model information of the mobile phone, communication method, and received radio wave intensity of the mobile phone;
A moving body information collecting unit for collecting moving body information including a moving speed and a moving direction of the moving body;
A storage unit for storing the mobile phone information and the mobile body information in association with the position of the mobile body;
Each time the mobile phone information collection unit and the mobile information collection unit collect information, the newly collected information is compared with the information stored in the storage unit, and the information stored in the storage unit is stored. A comparison section for updating and adding information;
When there is a plan to make a call on the mobile phone before reaching the destination, the mobile phone model and communication method included in the mobile phone information and the mobile body information stored in the storage unit, the mobile Based on the received radio wave intensity corresponding to the position of the body, the moving speed and the moving direction of the mobile body, the mobile radio body whose received radio wave intensity is less than a predetermined threshold in the mobile phone model and communication method used for the call A route search unit that searches for a route to the destination where good call quality is expected on the mobile phone excluding the position and the mobile state; and
A navigation device comprising: a route guidance unit for guiding a route to the destination searched by the route search unit. The route search unit, when call quality deteriorates during a call of the mobile phone, the mobile phone model and communication method included in the mobile phone information and the mobile information stored in the storage unit, Based on the received radio wave intensity corresponding to the position of the moving body, the moving speed and moving direction of the mobile body, the movement in which the received radio wave intensity is equal to or higher than the predetermined threshold in the mobile phone model and communication method used for the call. Search the body position and state as the place where the call quality is expected to be restored and the state of the mobile body,
The navigation device according to claim 1, wherein the route guidance unit presents the location searched by the route search unit and the state of the moving body to a user.   The mobile phone information collection unit collects the degree of occurrence of sound interruption and error correction information in the mobile phone in a call state as information indicating call quality included in the mobile phone information. The navigation device according to claim 2. The storage unit stores the mobile phone information and the mobile body information in association with the position of the mobile body according to each of a plurality of types of mobile phones,
The route search unit searches for a route in which good call quality is expected in each of the plurality of types of mobile phones based on the mobile phone information and the mobile body information stored in the storage unit,
The navigation according to any one of claims 1 to 3, wherein the route guide unit presents the route searched by the route search unit and the mobile phone corresponding to the route to the user. apparatus.

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