JP2010078533A - Car navigation device, car navigation system, and communication method in car navigation system - Google Patents

Abstract

[PROBLEMS] To reduce the burden of usage charges on the user, to efficiently use radio resources even from the viewpoint of the mobile communication system, and to be out of service while using a car navigation service. So that it will not be interrupted.
A map management server and a car navigation device are connected to each other via a first wireless communication network and a second wireless communication network capable of a larger capacity communication than the first wireless communication network. When communication is performed between the apparatus and the map management server, control information is transmitted and received via the first wireless communication network, and map information is downloaded via the second network.
[Selection] Figure 1

Description

  The present invention relates to a car navigation device, a car navigation system, and a communication method in the car navigation system.

  Mobile communication systems are not only used for voice call services, Internet and e-mail exchanges, but can also be used in communication with various information devices because they can continue to use communications while moving. It is illustrated. Especially in recent years, broadbandization of mobile communication has progressed, and high-speed data communication exceeding 10 Mbit / s has been put to practical use in the downlink while moving at high speed. In the future, communication service specifications exceeding 100Mbit / s will be standardized and will be put to practical use for general users in recent years.

  One of services using a mobile communication system is a car navigation system. In the current car navigation system, in order to cope with ever-changing map information, the apparatus must be removed from the vehicle and the map information must be updated. However, as mentioned above, if a communication service exceeding 100 Mbit / s is put to practical use in the future, it will not bother to remove it from the vehicle and update it to the latest map information in real time in the form of in-vehicle use. Car navigation services can be provided.

  As described above, while an environment in which a high-speed mobile communication service exceeding 100 Mbit / s is put into practical use for general users is being developed, it has been put into practical use like a short message service (hereinafter referred to as SMS: Short Message Service). The small-capacity mobile communication functions that are being used are also being used. Mobile communication devices that combine the above-mentioned large-capacity mobile communication functions and SMS functions have also been put to practical use, and users can use either large-capacity communication or small-capacity communication according to the application to be used. It has become an environment that can.

  As a conventional technology of a vehicle-mounted data communication device such as a navigation device, for example, there is one described in Patent Document 1. Patent Document 1 aims to always display the latest map information without managing whether the map information is new or not, and the navigation device does not have a storage means for storing the map information that is not currently needed. Information is collectively managed at the map center. In addition, the map information stored in this map center is always kept up-to-date, and the navigation device user is transmitted to the map center by transmitting means to acquire the current position and means for acquiring the current position. A communication means for receiving map information corresponding to the position information, a drawing means for creating drawing information at the current position from the received map information and the acquired position information, and a display means for displaying the drawing information. The map information corresponding to the current position information is displayed together with the position information.

  In addition, the car navigation device described in Patent Document 2 can always use new map information with a minimum expense without changing the medium in which the map information is stored by the user when the map information is changed. And a connecting device for connecting to a map information supply device that supplies map information, and the determining device stores the map information in a map information storage unit. When it is determined that the map information is old, the control device downloads the map information from the map information supply device through the connection device, updates the map information stored in the map information storage device, and uses the updated map information. The latest map is displayed on the display device.

  On the other hand, as an invention related to a vehicle-mounted device using the above-described SMS, there is one described in Patent Document 3. The in-vehicle data access unit of Patent Document 3 is intended to prevent the main CPU from starting unnecessarily, and an embedded wireless communication device mounted in the in-vehicle data access unit is obtained from an electronic mail server. When the transmitted SMS transmission signal is received through the base station, if the incoming call by the received SMS transmission signal is valid, the main CPU is activated, and the incoming call by the received SMS transmission signal is received. If it is not valid, the activation of the main CPU is prohibited.

JP 2000-67385 A JP 2002-148051 A JP 2005-142642 A

  Update of map data for car navigation devices currently in practical use is done by sending the car navigation device to a vendor to update the map data or by using a personal computer in the house. Done by the method. In either method, the car navigation device must be removed from the vehicle and the map data must be updated, and the user has to do a lot of work. In addition, these services are generally very expensive, and cannot be easily used by users.

  In addition, there is a service form in which the map data is stored on a DVD and the latest map data is provided by replacing the DVD. However, there is a problem with the capacity of the DVD, and it is difficult to cope with the current abundant services. Furthermore, when purchasing a DVD, it is necessary to apply and obtain it, so it is not easy to use immediately when you want to update it, and not only the updated part but also all the maps including the part that has not been updated. Since the information is included, it is more expensive than the case where the map information of only the updated part is obtained. For this reason, there is a problem that it is difficult to determine at what timing the map information that will soon become out of date even if it is updated.

  The above-described problems are the same in the conventional technology described above. In the form in which all map information is stored and managed in the map center, the amount of communication becomes large and the load on the mobile communication system becomes very large. As a result, the map information update service itself is expensive, and it is considered that the charge on the user side who uses this service increases.

  Conversely, when storing basic map information on the car navigation device side and downloading updated map information from the center side, in the conventional technology, transmission / reception of version information of map information and transmission / reception of transmission requests are also performed, When map information is transmitted in the same manner, the use of radio resources is inefficient.

  Therefore, there is a need for a technology that can efficiently use radio resources of a mobile communication system without increasing the burden of usage charges on the user side. Furthermore, even when a certain communication system goes out of service, if the update request information and map information can be transmitted and received by another communication system, the user can always obtain the latest map information and use the car navigation device in a comfortable environment. can do.

  The present invention does not increase the usage fee burden for the user, can efficiently use radio resources even from the viewpoint of the mobile communication system, and further, because the user goes out of service area while using the car navigation service. The purpose is to prevent the service from being interrupted.

  In order to solve the above-described problems, in the present invention, the second wireless communication capable of a larger capacity communication between the map management server and the car navigation device than the first wireless communication network and the first wireless communication network. When communicating via the network and communicating between the car navigation device and the map management server, control information is transmitted and received via the first wireless communication network, and map information is downloaded via the second network. To do it.

  Further, the car navigation device creates route information to the destination based on the destination information input by the user and the current position, transmits the position information and the route information to the map management server, and receives the position information from the map management server. When a signal notifying the presence or absence of updated map information retrieved based on the route information is received and a signal notifying that updated map information is present is received, the map management is performed by connecting to the second wireless communication network. Downloaded map information from the server.

  In addition, when communication between the car navigation device and the map management server cannot be performed via the first wireless communication network, control signals are transmitted and received via the second wireless communication network.

  Further, when map information is also stored in the car navigation device and communication between the car navigation device and the map management server cannot be performed via the second wireless communication network, the car navigation device In addition to the location information and the route information, the map management server transmits out-of-service information notifying that it is out of the service area of the second wireless communication network, to the information received from the car navigation device. Correspondingly, service area information that can be enjoyed by the map information update service in the second communication network is created and transmitted to the car navigation device via the first wireless communication network. Combine the map information and service area information stored in the storage unit , It was to be displayed on the display means.

  According to the present invention, there is no burden on the usage fee for the user, radio resources can be used efficiently even from the viewpoint of the mobile communication system, and further, the user goes out of service area while using the car navigation service. Therefore, it is possible to provide a car navigation system and a communication method in the car navigation system in which the service is not interrupted.

Hereinafter, embodiments of the present invention will be described.
First, the configuration of the entire network of the navigation system of the present invention will be described.

FIG. 1 is a diagram for explaining the configuration of the entire network in an embodiment of the present invention.
In FIG. 1, 100 is a map management server, 200 is a core network, 300 is a short message service network, 400 is a broadband (hereinafter referred to as BB) communication network, 500 is a car navigation device, and 600 is a GPS satellite. The present invention is characterized in that the car navigation device 500 has a high-speed communication module having a function of transmitting and receiving SMS and can update map information in real time.

  When the user sets the destination to the car navigation device 500, the car navigation device 500 acquires position information from the GPS satellite 600, merges the information with the map information stored in the car navigation device itself, and creates a route pattern. Create information. Subsequently, the car navigation apparatus transmits its own position information and the created route pattern information to the SMS network 300 by a short message. This information is sent to the map management server 100 via the core network 200.

  Based on the position information and route pattern information received from the car navigation device, the map management server collates with the latest version of map information held by the map management server itself, and determines whether there is a block that can be updated with the route pattern information. Search for. If there is updatable block information, it is created as updated map information, and the updated map information is stored in the map management server itself. Next, the map management server 100 transmits the presence / absence of updated map information to the car navigation device 500 via the core network 200 and the SMS network 300 as a short message.

  The car navigation device 500 that has received information about the presence or absence of updated map information from the map management server, if there is no updated map information, provides a car navigation service to the user using the map information stored in the car navigation device itself I will provide a. If there is updated map information, the car navigation device 500 establishes a connection with the BB communication network 400 and downloads updated map information from the map management server 100 via the core network 200. Then, the downloaded updated map information and the map information stored in the car navigation apparatus itself are merged to provide a car navigation service using the latest map information to the user.

Next, the configuration of the car navigation device will be described.
FIG. 2 is a diagram for explaining the configuration of the car navigation apparatus in one embodiment of the present invention.
As shown in FIG. 2, the car navigation device 500 of this embodiment includes a high-speed communication module 510 having an SMS communication function, an in-vehicle navigation unit 520, an antenna unit 501, and an IO power supply control unit 502.

  The high-speed communication module 510 having the SMS communication function includes a CPU (1) 511, a ROM (1) 512, a RAM (1) 510, a rear IF 514, an auxiliary battery 515, an antenna connection unit (1) 516, , An SMS communication module unit 517, a BB communication module unit 518, and a power supply IF (1) 519.

  The car navigation unit 520 includes a CPU (2) 521, a map information work area 522, an update database 523, an antenna connection unit (2) 524, a GPS communication module unit 525, a module IF 526, a display unit 527, A key input unit 528, a ROM (2) 529, a RAM (2) 530, a basic map information medium 531 and a power supply IF (2) 532 are included.

Next, the operation of each unit will be described.
When the user starts the engine of the car, the power supply IF (1) 519 in the high-speed communication module 510 with the SMS function and the power supply IF (2) in the car navigation unit 520 from the main battery of the car via the IO power control unit 502. Power is supplied to each component via 532. Next, the CPU (2) 521 expands the software stored in the ROM (2) 529 from the ROM (2) 529 to the RAM (2) 530. Next, the basic map information is developed in the map information work area 522 from the basic map information medium 531. Subsequently, the GPS communication module unit 525 communicates with the GPS satellite 600, and the current position information is received from the antenna unit 501 via the antenna connection unit (2) 524. The CPU (2) 521 merges the position information with the map information and displays it on the display unit 527.

  Next, when the user inputs destination information from the key input unit 528, the CPU (2) 521 configures route information to the destination in the map information work area 522 in units of route blocks. Next, the CPU (2) 521 transmits route pattern information, which is information in which identification numbers for identifying the route blocks are arranged, and position registration information to the high-speed communication module 510 with the SMS function via the module IF527.

  When the power is supplied from the power supply IF (1) 519, the high-speed communication module 510 with the SMS function expands the software from the ROM (1) 512 to the RAM (1) 513. Subsequently, the SMS communication module unit 517 and the BB communication module unit 518 are activated to shift to a communication standby state.

  Further, when the high speed communication module 510 with the SMS function receives the route pattern information and the position registration information from the car navigation unit 520 via the rear IF 514 in the high speed communication module 510 with the SMS function, the CPU (1) The route pattern information and location registration information received by the communication module unit 517 are converted into a short message and transmitted to the SMS network 300 via the antenna unit 501 connected to the antenna connection unit (1) 516. The auxiliary battery 515 is an auxiliary power source for continuing the service without affecting the battery on the vehicle side even if the user turns off the vehicle engine during the update service. This short message is received by the map management server 100 via the core network 200.

Next, the map management server will be described.
FIG. 3 is a diagram illustrating the configuration of the map management server in one embodiment of the present invention.
As shown in FIG. 3, the map management server 100 includes a CPU (3) 101, a network interface unit 102, a memory 103, a hard disk 104, an IO control unit 105, an update map database 111, and an update information block group. 112 and a map database 110. In the update information block group 112, update information is managed for each user.

  Next, the operation of each unit will be described.

When the CPU (3) 101 receives the route pattern information and the location registration information from the high-speed communication module 510 with the SMS function via the network interface unit 102, the CPU (3) 101 collates the received information with the update map database and updates the route block that can be updated. Search whether there is.
If there is an updatable route block, it is expanded into an update information block group 112 managed for each user. In the example illustrated in FIG. 3, the update information block group of user A in the update information block group 112 managed for each user has seven updatable route blocks. Among the route blocks actually configured by the car navigation unit 520, the route block (2) 1121 that is the second route block, the route block (4) 1122 that is the fourth route block, and the route block that is the seventh route block Block (7) 1123, Route block (8) 1124, which is the eighth route block, Route block (10) 1125, which is the tenth route block, Route block (11) 1126, which is the eleventh route block, Route block This indicates that the 15th route block (15) 1127 is configured as an updatable route block.

The CPU (3) 101 transmits the presence / absence of an updatable route block from the network interface unit 102 to the core interface 200. The SMS communication module unit 517 receives the presence / absence of a route block that can be updated from the SMS network 300 via the antenna unit 501.
If there is no updated route block, the CPU (1) 511 notifies the car navigation unit 520 of this via the rear IF 514. When the CPU (2) 521 of the car navigation unit 520 receives this information, it starts providing a car navigation service based on the route block configured in the map information work area 522.
When there is an update route block, the CPU (1) 511 instructs the link establishment between the BB communication module unit 518 and the BB communication network 400, and from the map database 110 in the map management server 100 via the BB communication network 400. Download of update map information of update route block is started.

  The updated map information of the downloaded update route block is sent to the car navigation unit 520 via the rear IF 514 by the CPU (1) 511. The CPU (2) 521 sequentially stores the update map information of the update route block received via the module IF 526 in the update database 523. When storage of the updated map information of all the updated route blocks is completed, the route block in the map information work area 522 and the data of the update database 523 are merged, and the car navigation service is provided to the user based on the latest map information. provide.

  Next, the sequence of the map information update process of the present invention will be described.

FIG. 4 is a diagram illustrating a sequence of map information update processing according to an embodiment of the present invention.
FIG. 4 shows the flow of control signals and data in the map information update flow among the map management server 100, the core network 200, the BB communication network 400, the SMS network 300, the communication module 510, and the car navigation unit 520. Yes.

  Upon receiving the destination setting S100 from the user, the car navigation unit 520 transmits a route block information transmission and a position information transmission start instruction S101 to the communication module 510. The communication module 510 executes transmission of route block information and position information to the map management server 100 via the SMS network 300, the BB network 400, and the core network 200 (S102).

  The map management server 100 searches for an updatable route block from the route block information and the position information received from the car navigation device 500 (S103). Information on the presence or absence of an updatable route block obtained as a result of the search is notified to the communication module 510 via the core network 200, the BB network 400, and the SMS network 300 (S104). Only when there is no updatable route block, the car navigation unit 520 is further notified of the updatable route block S105.

  When there is an updatable route block, the communication module 510 transmits a link establishment request S200 to the BB network 400. When the BB link is established, a link probability completion notification is sent from the BB network 400 to the communication module 510 and the map management server 100. As a result, the link of the BB line is established, and the map management server 100 starts transmitting updated map information of the updated route block S202. When the map management server 100 completes the transmission of the update map information of all the update route blocks, the map management server 100 transmits an update route block transmission end S203 to the communication module 510 via the core network 200 and the BB network 400. Upon receiving the update route block transmission end S203, the communication module 510 transmits a release request S204 to the BB network 400. When the release of the link of the BB line is completed, a link release completion notification S205 is transmitted from the BB network 400 to the map management server 100 via the communication module 510 and the core network 200.

  If the user runs off the route set by the car navigation unit 520 and the route block area deviating S300 occurs that deviates from the area included in the route block information acquired from the map management server, the above-described S102 ~ The process of S205 is executed again to reconstruct the route block in the car navigation unit 520.

  When the user arrives at the destination, or when the user selects S400 in the middle of the navigation service, the service is completed from the car navigation unit 520 to the map management server 100 via the communication module 510, the SMS network 300, and the core network 200. Notification S401 is transmitted. When the map management server 100 receives the service completion notification S401, the map management server 100 deletes S402 the update route block information of the corresponding user held in the update information block group.

Next, map information update processing in the case where out-of-service processing is involved will be described.
FIG. 5 is a flowchart for explaining map information update processing in the case where out-of-service processing is performed in one embodiment of the present invention.
The out-of-service processing described here is processing when the SMS network 300 is out of service and processing when the BB communication network 400 is out of service.

  First, as a result of attempting to access the SMS network 300, if it is out of service area, the map information update service is continued by performing processing that should be performed by SMS using the BB communication network 400.

On the other hand, when the BB communication network 400 is out of service area, the BB communication network 400 on the route block to the destination can be provided to the map management server 100 by a short message using the SMS network 300. Ask whether there is a bad block.
If there is a serviceable block, a code for identifying the block is sent from the management server 100 to the high-speed communication module 510 with the SMS function and merged with the basic map information on the car navigation unit 520 in real time. Provide to users.
By doing in this way, even if the update service of the map information via the BB communication network 400 is out of the service area of the BB communication network 400, the provision of the information of the update route block that can provide the service via the SMS network. Can be serviced in the form.
Hereinafter, each out-of-service process will be described.
(1) Processing when the SMS network is out of service area When the SMS network is out of service area, first, when the destination is set by the user, the process proceeds from the route information setting and change waiting F100 to the map update necessity determination routine F101. Since it has been set, YES is determined in the map update necessity determination routine F101. Next, in the SMS area determination routine F102, the determination is NO because the SMS network is out of the area. Next, in the BB area determination routine F103, since the BB communication network is within the area, YES is determined. Then, BB link establishment F106 is performed, route block information / position information transmission F105 is performed, YES is determined in the update data existence determination routine F104, update map information is downloaded F107, and update map information download completion F108 is performed. The link is released 109, the process transits to the route information setting and change wait F100, and waits for the next user action.

If NO is determined in the update data existence determination routine F104, the process transits to route information setting / waiting for change F100 and waits for the next user action. If the BB communication network is also out of range and NO is determined in the BB communication network range determination routine F103, the user is notified that the update service is disabled F120, and the SMS range determination routine F102 and the BB range determination routine F103 Continue to check if the service is available.
(2) Processing when BB communication network is out of service area When the BB communication network is out of service area and the SMS network is in service area, YES determination is made in the SMS service area determination routine F102, and NO determination is made in the BB service area determination F103. Subsequently, if the service area information non-reception determination F110 is YES, out-of-service information, location information, and route block information are transmitted to the map management server F111 via the SMS network. Then, the service area information for notifying the area within the BB communication network created by the map management server based on the out-of-service information, the position information, and the route block information received from the car navigation device is received F112, and the received service area information is received. Is merged F113 into the basic map information stored in the car navigation unit of the car navigation device and displayed to the user. The BB area determination routine F103 and the service area information non-reception determination routine F110 continue determination until entering the service area of the BB communication network and enabling the map information update service.
(3) Processing when both networks are within range When both network services of the SMS network and the BB communication network are within range, YES determination is made in the SMS range determination routine F102, and YES determination is made in the BB range determination F103. Next, if YES is determined in the update data existence determination F104, route block information / position information transmission F105 is performed, and a BB link probability F106 is obtained. Then, the update map information is downloaded F107, and after the update map information download completion F108, the BB link is released F109, the process proceeds to route information setting and change waiting F100, and waits for the next user action.

  If NO is determined in the update data existence determination routine F104, the process proceeds to route information setting / waiting for change F100 and waits for the next user action.

  In the embodiment of the present invention described above, as a specific hardware image, a high-speed communication module with an SMS function can be realized by a communication card. According to the communication card and the control application in the car navigation realizing the above embodiment of the present invention, it is possible to use both a large-capacity communication system and a small-capacity communication system according to the capacity and usage of communication information. Become. Further, according to the above embodiment of the present invention, the radio resources on the communication system side are effectively used, and as a result, the communication cost on the user side can be reduced. As a result, the map information update service can be spread.

  Further, even when one of a plurality of types of communication systems shown in the above embodiments of the present invention becomes unusable, it is possible to continue providing services via the remaining operable communication system. Furthermore, information regarding service restoration of a communication system that has become unusable can be notified to a user by an operable communication system.

It is a figure explaining the structure of the whole network in one Example of this invention. It is a figure explaining the structure of the car navigation apparatus in one Example of this invention. It is a figure explaining the structure of the map management server in one Example of this invention. It is a figure explaining the sequence of the update process of the map information in one Example of this invention. It is a flowchart explaining the update process of the map information in case the out-of-service process in one Example of this invention is accompanied.

Explanation of symbols

Map management server core network Short message service network BB communication network
500 car navigation system
600 GPS satellite
501 Antenna section
502 IO power supply controller
510 High-speed communication module with SMS function
511 CPU (1)
512 ROM (1)
513 RAM (1)
514 Rear IF
515 Auxiliary battery
516 Antenna connection (1)
517 SMS communication module
518 Communication module
519 Power IF (1)
520 Car navigation unit
521 CPU (2)
522 Map Information Work Area
523 update database
524 Antenna connection (2)
525 GPS communication module
526 Module IF
527 display
528 Key input section
529 ROM (2)
530 RAM (2)
531 Media for basic map information
532 Power IF (2)
101 CPU (3)
102 Network interface
103 memory
104 hard disk
105 IO control
110 Map database
111 Update map database
112 Update information block group for each user

Claims (13)

A car navigation device that transmits and receives control information to and from a map management server that updates and manages map information, and that downloads map information from the map management server and displays it on display means,
First communication means for communicating with a first wireless communication network;
Second communication means for communicating with a second wireless communication network capable of a larger capacity communication than the first wireless communication network;
A control unit,
In the communication with the map management server, the control unit performs transmission / reception of the control information by the first communication means via the first wireless communication network, and download of the map information via the second network. Car navigation apparatus characterized by being performed by the second communication means. The car navigation device according to claim 1,
Position information acquisition means for acquiring current position information;
An input means for a user to input information;
Destination information input by the user from the input means, and route information creation means for creating route information to the destination based on the current position acquired by the current position acquisition means,
The first communication means transmits the position information and route information to the map management server and notifies the presence or absence of updated map information retrieved from the map management server based on the position information and route information. Receive
When the control unit receives a signal notifying that there is updated map information,
A car navigation device, wherein the map information is downloaded from the map management server by being connected to a second wireless communication network by the second communication means.   3. The car navigation device according to claim 2, wherein when the connection to the first wireless communication network is not possible, the position information and the route are transmitted via the second wireless communication network by the second communication unit. A car navigation device characterized by transmitting information to the map management server and receiving a signal notifying the presence or absence of updated map information searched based on the position information and route information from the map management server. The car navigation device according to claim 2,
The car navigation device also has a storage unit that stores map information,
When connection to the second wireless communication network is not possible, out-of-service information for notifying that the second wireless communication network is out of service in addition to the location information and route information by the first communication means. Transmitting the service area information corresponding to the transmission information and receiving the map information update service by the second communication network created by the map management server via the first communication means; A car navigation device characterized in that the service area information is combined with map information stored in a storage unit in the device and displayed on the display means.   5. The car navigation device according to claim 1, wherein a short message service network is used as the first wireless communication network. A map management server for updating and managing map information;
A car navigation system having at least one car navigation device that transmits and receives control information to and from the map management server, downloads map information from the map management server, and displays the map information on display means,
The map management server and the car navigation device are connected via a first wireless communication network and a second wireless communication network capable of a larger capacity communication than the first wireless communication network,
The car navigation device includes:
First communication means for communicating with the first wireless communication network;
Second communication means for communicating with the second wireless communication network;
A control unit,
In the communication with the map management server, the control unit performs transmission / reception of the control information by the first communication means via the first wireless communication network, and download of the map information via the second network. Car navigation system characterized by being performed by second communication means. The car navigation system according to claim 6,
The car navigation device further includes:
Position information acquisition means for acquiring current position information;
An input means for a user to input information;
Destination information input by the user from the input means, and route information creation means for creating route information to the destination based on the current position acquired by the current position acquisition means,
The first communication means transmits the position information and route information to the map management server and notifies the presence or absence of updated map information retrieved from the map management server based on the position information and route information. Receive
When the control unit receives a signal notifying that there is updated map information,
A car navigation system for downloading map information from the map management server by connecting to a second wireless communication network by the second communication means. The car navigation system according to claim 7, wherein communication between the car navigation device and the map management server cannot be performed via the first wireless communication network.
The car navigation system transmits and receives control signals via the second wireless communication network by the second communication means. The car navigation system according to claim 7,
The car navigation device also has a storage unit that stores map information,
When communication between the car navigation device and the map management server cannot be performed via the second wireless communication network,
The car navigation device includes:
In addition to the location information and route information, the first communication means transmits out-of-service information notifying that the second wireless communication network is out of service, via the first wireless communication network,
The map management server
Service area information created corresponding to the information received from the car navigation device and enjoyed by the map information update service in the second communication network is transmitted to the car navigation device via the first wireless communication network. Send
The car navigation system displays the map information stored in a storage unit in the car navigation system and the service area information together on the display means. A map management server for updating and managing map information;
A method for updating map information in a car navigation system having at least one car navigation device that transmits / receives control information to / from the map management server, downloads map information from the map management server, and displays the map information on display means,
The map management server and the car navigation device are connected via a first wireless communication network and a second wireless communication network capable of a larger capacity communication than the first wireless communication network,
In the communication between the car navigation device and the map management server, the control information is transmitted / received via the first wireless communication network, and the map information is downloaded via the second network. Communication method in a car navigation system. A communication method in the car navigation system according to claim 6,
The car navigation device creates route information to a destination based on destination information input by a user and a current location, transmits the location information and route information to the map management server, and the map management server If a signal notifying the presence or absence of updated map information retrieved based on the location information and route information is received, and a signal notifying that updated map information is present is received, connection to the second wireless communication network is established. And downloading map information from the map management server. The communication method in the car navigation system according to claim 11, wherein communication between the car navigation device and the map management server cannot be performed via the first wireless communication network.
The communication method in the car navigation system, wherein the car navigation device transmits and receives control signals via the second wireless communication network. It is a communication method in the car navigation system according to claim 11,
Map information is also stored in the car navigation device,
When communication between the car navigation device and the map management server cannot be performed via the second wireless communication network,
The car navigation device transmits out-of-service information for notifying the out-of-service area of the second wireless communication network, in addition to the position information and route information, via the first wireless communication network,
The map management server creates service area information created in correspondence with the information received from the car navigation apparatus and enjoyed by the map information update service in the second communication network via the first wireless communication network. , Transmit to the car navigation device,
The car navigation device displays the map information stored in a storage unit in the car navigation device and the service area information together on the display means.

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