JP5349023B2 - Navigation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a navigation apparatus capable of efficiently downloading update data of road map data from an information distributing server, when moving. <P>SOLUTION: In the navigation apparatus 100, when downloading the update data of the road map data, a scheduling is previously carried out for the download operation by using a link as a unit making up a searched route. Furthermore, the download scheduling is carried out in consideration of a wireless communication performance. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a navigation device that downloads update data of road map data from an information distribution server during movement.

  The navigation device displays a road map on the display screen of the display. In fact, roads are newly created, abolished, improved, etc., and road map data must be updated accordingly. The update data is often recorded on either a recording medium such as a CD-ROM or a storage device of an information distribution server connected to a wide area communication network such as a cellular phone network. In the former case, the recording medium is mounted on the navigation device by the reading device, and the update data can be read out. In the latter case, the update data recorded in the storage device of the content distribution server can be downloaded as a data signal via the wide area communication network and the wireless base station.

  In the navigation device, the actual update timing of the road map data often overlaps with the start of movement. When road map data is downloaded as a data signal via wireless communication, optimal route guidance cannot be executed unless the download of the road map data is awaited. Therefore, Patent Document 1 discloses a map data transmission device that can prioritize map data related to a searched route from a region close to a user's starting point and distribute it to a mobile object.

JP 2001-241965 A

  According to the invention disclosed in Patent Document 1, when the wireless communication connected to the mobile unit is unstable during download, the communication performance such as the communication speed and the communication band is considered, and the priority of the untransmitted map data is determined. Reselect high unsent parts. Therefore, since the download is interrupted during the communication performance change detection process and the recalculation process for reselecting the untransmitted parts, there is a problem of inefficiency of the download process.

The navigation device according to the present invention includes a computing unit that computes to search for a recommended route, a receiving unit that receives a list of map data to be acquired regarding the recommended route by communication, and a plurality of contents included in the map data in the list. Among them, identification means for identifying the target content to be acquired while the moving body moves along the recommended route and other content to be acquired while the moving body is stopped by the attribute, and the moving body moves along the recommended route When the mobile object is detected based on the detection means for detecting the communication state for each section of the recommended route, the attribute, the movement order of the section in which the mobile object moves, and the communication state detected for each section. scheduling for obtaining target content separately for each section while moving the recommended route, the moving body is performed before starting the move along the recommended route Sukeji A-ring unit, map data obtained for the recommended route is characterized by an update data for updating the road map regarding the recommended route.

  According to the present invention, the navigation device can efficiently download the update data of the road map data from the information distribution server during movement.

  With reference to FIGS. 1-16, one Embodiment which mounted the navigation apparatus by this invention in the vehicle is described. FIG. 1 is a diagram showing an overall configuration of a road map data update system including a navigation device according to the present embodiment.

  The road map data update system shown in FIG. 1 includes a vehicle 10 equipped with the navigation apparatus of the present embodiment, an information distribution server 200, a base station 300, and a wide area communication network 40.

  The information distribution server 200 is connected to the wide area communication network 40 via the network interface, and has a function of searching and collecting various information distributed in the wide area communication network 40, a function of managing the collected information as a database, This is a server having a function of distributing such information to mobile terminals.

  Base station 300 has a function of providing a wireless communication service to a mobile terminal such as the navigation apparatus of the present embodiment, and is connected to wide area communication network 40 as a gateway node.

  In the example of FIG. 1, the information distribution server in which the navigation device of the present embodiment mounted on the vehicle 10 is connected to the wide area communication network 40 when the vehicle 10 travels the route from the departure place to the destination. The update data of the road map data from 200 is first received via wireless communication with the base station 300 (X) and then via wireless communication with the base station 300 (Y).

  FIG. 2 is a diagram illustrating a configuration of the navigation device 100 according to the present embodiment. The CPU 110 is an arithmetic processing device that controls the entire navigation device 100, and the CPU 110 and its peripheral devices are connected to each other via a bus. The peripheral devices include a main storage device 115, an auxiliary storage device 140, a display module 150, and a wireless communication module 160. The main storage device 115 has a work memory that is a work area of the CPU 110 and a program memory in which a control program is stored.

  In the CPU 110, signals from the current location detection device 120 and the user input device 130 are input. The current location detection device 120 is, for example, a GPS sensor, a gyro sensor, and a vehicle speed sensor. The user input device 130 is, for example, a touch panel, a push button switch around the panel, a remote control, and a joystick.

  The auxiliary storage device 140 is a storage device that stores road map data and POI (Point Of Interest) information used for navigation processing. The auxiliary storage device 140 may be, for example, a hard disk drive, a CD or DVD storing road map data, a flash memory, other recording media, and a reading device thereof.

  The road map data is information relating to the map, and includes map display data, route search data, and guidance data. The map display data is data for displaying the road and the background of the road map. The route search data is data including branch information not directly related to the road shape, and is mainly used when calculating a recommended route (route search). The guidance data is data including intersection name, road name, direction name, and direction guide facility information, and is used when the user is guided based on the calculated recommended route.

  In road map data, a single road is represented as link string data by defining intersections as nodes and defining links between nodes. Therefore, the link string data is composed of node data and link data. In the road map data, node data and link data are classified and stored in mesh area units together with mesh codes. The mesh area refers to each divided area when the road map is divided into predetermined ranges. A number for identifying the mesh area is stored in the mesh code storage area. In the link string data storage area, node position coordinates, link numbers representing links between nodes, and position coordinates of interpolation points that further divide the links are stored. These position coordinates are used as shape data for map display and locator processing.

  The auxiliary storage device 140 stores an individual identifier representing the navigation device 100 used in communication with the information distribution server 200. The auxiliary storage device 140 reserves a buffer area for storing update data and an update data list acquired (downloaded) from the information distribution server 200, and stores various settings when the update data is downloaded. The auxiliary storage device 140 further stores various data collected or measured (measured) in the navigation device 100 and statistical traffic information. The display module 150 displays image data including characters and graphics output from the CPU 110 on the screen. The wireless communication module 160 performs wireless communication with the base station 300 via an antenna.

  FIG. 3 is a system block diagram of the information distribution server 200. The information distribution server 200 transmits and receives communication messages to and from the navigation apparatus 100 via the wide area communication network 40 and the base station 300 using the network interface 210. The wide area communication network 40 may be composed of, for example, one or a plurality of telephone networks, or may be composed of the Internet. The network interface 210 may be configured to support either the Internet or the telephone network, or may be configured to support either one. The platform (OS) 220 controls application software and hardware. Accordingly, the platform 220 also includes driver software for the network interface 210, and each application software 230 to 260 operates on the operating system 220.

  The maintenance operation function unit 230 translates a command input when an operator accesses the information distribution server 200 and delivers it to the platform 220 for maintenance and operation of the information distribution server 200.

  The communication message processing unit 240 analyzes a communication message received from the navigation device 100 by the information distribution server 200 and creates a communication message that the information distribution server 200 transmits to the navigation device 100. The communication message includes, for example, an individual identifier of the navigation device 100, an inquiry about the presence or absence of update data, an update data list, and update data. The communication message processing unit 240 may have an access control processing function such as password authentication.

  The data processing unit 250 searches the database 260 and creates an update data list and update data. The database 260 stores road map data, management data such as a version of the road map data, and individual identifier data of the navigation device 100.

  FIG. 4 is a flowchart showing a road map data update processing procedure executed by the CPU 110 of the navigation device 100.

  In step S410, it is determined whether a recommended route search calculation process from the departure place to the destination has been executed. In the case of negative determination, this determination is repeated until an affirmative determination is obtained. If the determination is affirmative, in step S420, the information distribution server 200 is inquired whether there is update data. In the case of negative determination, this processing procedure ends. If the determination is affirmative, an update data list is acquired from the information distribution server 200 in step S430.

  In step S440, the subroutine “calculation of communication capacity for each link” is executed, and when the vehicle 10 travels on the road corresponding to each link included in the searched route, the update that can be acquired by the navigation device 100 by wireless communication is performed. Calculate the capacity of the data. In step S450, the subroutine “update data download priority setting” is executed to allow the user to input a setting for selecting the type of update data having a high acquisition priority among the update data that can be acquired by the navigation device 100.

  In step S460, the update data download order and timing are scheduled based on the acquired update data list, the calculated communication capacity per link, and the update data download priority setting input by the user.

  In step S470, a message to permit the vehicle 10 to start running is displayed on the screen of the panel included in the display module 150, and it is determined whether or not movement has actually started. In the case of negative determination, this determination is repeated until an affirmative determination is obtained. If the determination is affirmative, a subroutine “update data download” is executed in step S480, and the update data is downloaded according to the scheduled order and timing. When the subroutine “update data download” is completed, this processing procedure ends.

  FIG. 5 is a flowchart showing the contents of the subroutine “calculation of communication capacity for each link”.

  In step S510, the variable n is reset. The variable n is the ordinal number of the nth link included in the route from the departure place to the destination, and represents the order of links representing the road on which the vehicle 10 travels. The vehicle 10 travels on the road corresponding to each link in ascending order from the first link. In step S520, the variable n is incremented by 1. In step S530, the link number of the nth link is specified.

  In step S540, the communication speed (standard value) of the wireless communication module 160 is collected. In step S550, the radio field strength is collected. The values of the radio field strength collected here are values obtained from the radio field strength data provided by the communication carrier and the radio field strength data measured in the past by the antenna included in the radio communication module 160.

  In step S560, link travel time is collected. The value of the link travel time collected here is a value obtained from the average link travel time data included in the statistical traffic information and the link travel time data measured in the past.

  In step S570, when the vehicle 10 travels on the road corresponding to the nth link, the capacity of update data that can be acquired by the navigation device 100 by wireless communication is calculated. In step S580, it is determined whether or not the communication capacity calculation for all links has been completed. If the determination is negative, the process returns to step S520. If the determination is affirmative, this processing procedure ends.

  FIG. 6 is a flowchart showing the contents of the subroutine “update data download priority setting”.

  In step S610, a screen on which the user can input update data download priority settings is displayed on a panel included in display module 150. An example of the displayed screen is shown in FIG. When the check boxes corresponding to “convenience store” and “supermarket” are marked, the acquisition priority is set high. Since the check box corresponding to “Department store” is not marked, the acquisition priority is set low. When the check box corresponding to “transport / service” is marked, all the check boxes corresponding to “gas station”, “parking lot”, and “public toilet” are marked, and the acquisition priority is set high.

  In step S620 in FIG. 6, it is determined whether or not the setting input from the user is completed. If the determination is affirmative, the input content is reflected in the setting in step S630. If the determination is negative, default settings are set in step S640. In any case, this processing procedure ends.

  FIG. 8 is a flowchart showing the contents of the subroutine “update data download”.

  In step S8010, 1 is set to the variable k, and in step S8020, the variable m is reset. The variable k is the ordinal number of the k-th link included in the route from the departure point to the destination, and the vehicle 10 is traveling on the road corresponding to the k-th link. The variable m is the ordinal number of the m-th link included in the route from the departure point to the destination, and the navigation apparatus 100 downloads the update data scheduled to be downloaded at the m-th link.

  In step S8030, link travel time measurement is started. In step S8040, the measurement of the radio field strength is started by the antenna provided in the radio communication module 160. The radio field intensity is measured at one or a plurality of points while the vehicle 10 is traveling on the road corresponding to each link.

  In step S8050, the variable m is incremented by one. In step S8060, the update schedule scheduled to be downloaded through the m-th link is requested to the information distribution server 200 with reference to the update data download schedule. However, when the (m−1) -th link is the final link to the destination, the information distribution server 200 is requested for update data not associated with each link. In step S8070, reception of update data distributed as a response to the update data request is started.

  In step S8080, it is determined whether or not the vehicle 10 has finished traveling on the road corresponding to the k-th link. If a negative determination is made, the process proceeds to step S8380 described later. If the determination is affirmative, it is determined in step S8090 whether the vehicle 10 has arrived at the destination. If the determination is affirmative, the process proceeds to step S8140 described later. If the determination is negative, the variable k is incremented by 1 in step S8100.

  In step S8110, measurement of the link travel time is stopped, the measurement result is stored in the auxiliary storage device 140 in association with the link number of the (k-1) th link, and measurement of the link travel time at the kth link is started. To do. In step S8120, the measurement of the radio field strength is stopped, the measurement result is stored in the auxiliary storage device 140 in association with the link number of the (k-1) th link, and the measurement of the radio field strength at the kth link is started. To do.

  In step S8130, it is determined whether the value of variable m is smaller than the value of variable k. In the case of negative determination, that is, when the value of the variable m is greater than or equal to the value of the variable k, the vehicle 10 is in a state of being downloaded ahead of the download schedule of the update data, and the download is continued. Returns the process to step S8080 so as to travel on the road corresponding to the k-th link. In the case of an affirmative determination, that is, when the value of the variable m is smaller than the value of the variable k, the download is delayed from the update data download schedule. Since it is not necessary to continue downloading the update data scheduled to be downloaded by the link that the vehicle 10 has already passed, the reception of the update data is stopped in step S8140, and the process proceeds to step S8150. As described above, even in the case of an affirmative determination in step S8090, reception of update data is stopped in step S8140, and the process proceeds to step S8150.

  As described above, if a negative determination is made in step S8080, the process proceeds to step S8380. In step S8380, it is determined whether reception of update data scheduled to be downloaded via the k-th link has been completed. If the determination is negative, the process returns to step S8080. If the determination is affirmative, the process advances to step S8150 so that the download is performed ahead of the update data download schedule.

  In step S8150, it is determined whether or not reception of all update data to be acquired during movement has been completed. If a negative determination is made, the process returns to step S8050. If the determination is affirmative, in step S8160, the link travel time measurement is stopped, and the measurement result is stored in the auxiliary storage device 140 in association with the link number of the (k-1) th link. In step S 8170, the measurement of the radio field intensity is stopped, and the measurement result is stored in the auxiliary storage device 140 in association with the link number of the (k−1) th link.

  In step S8180, it is determined whether to download the remaining update data that is not associated with the link representing the road on which vehicle 10 is traveling. In the case of negative determination, this processing procedure ends. If the determination is affirmative, the remaining update data is downloaded in step S8190, and this processing procedure ends.

  Details of the download scheduling executed in step S460 in FIG. 4 will be described. As described above, in step S460, the update data download order and timing are scheduled based on the acquired update data list, the calculated link-by-link communication capacity, and the update data download priority setting input by the user.

  FIG. 9 shows an example of the update data list acquired from the information distribution server 200 in step S430. For convenience, the content ID is a number assigned to the content included in the update data. The type of each content is specified on the content database stored in the auxiliary storage device by the main category ID and the sub category ID.

  FIG. 10 shows an example of the content database. For example, the content whose main category ID is 03 is facility information, and the content whose subcategory ID is 008 in this case is a gas station.

  The setting category corresponds to the display of “transport / service”, “shop”, and “meal” on the update data download priority setting screen shown in FIG. 7 as an example. That is, the user selects a plurality of subcategories at once. This is a convenient category for designating. The attribute “priority acquisition necessity” is determined according to the priority given by the user input on the screen. The contents of the subcategory to which “◯” is assigned are scheduled to be downloaded preferentially. When not depending on user input, the attribute “priority acquisition necessity” is assumed to be a fixed value.

  The attribute “necessity of acquisition during traveling” is that “◯” is given to the content of the subcategory that needs to be downloaded in consideration of the planned traveling route while the vehicle 10 is traveling. Further, there is no need to consider the planned travel route, and for example, “×” is given to the content of the subcategory that may be downloaded after arrival at the destination. In the description of the present embodiment, the attribute “necessity of acquisition during running” is a fixed value, but may be changed by the user.

  “Data capacity” indicates the capacity of content data specified by the content ID. The “mesh code” indicates a mesh code including the position of the content data specified by the content ID. When there are a plurality of corresponding contents, a plurality of mesh codes are associated with each other. For content data that is not related to position, such as speech recognition data, the mesh code is “none”. When there is a relationship with the link such that the content data specified by the content ID is located on the link, a “link number” is associated.

  FIG. 11 shows an example of a link travel order list generated when a route is searched in step S410. “Link travel order” represents the order of links representing roads on which the vehicle 10 travels. For each link, a link number, a mesh code, and the order in which the vehicle 10 travels for that mesh code are represented.

  FIG. 12 shows a management table of communication capacity for each link calculated in FIG. 5 using the link travel order list obtained in FIG. “Data capacity” represents the communication capacity in each link.

  FIG. 13 shows that each content shown in FIG. 9 is based on the two attributes “Necessary acquisition during running” and “Necessary acquisition required” shown in FIG. 10 and the link traveling order shown in FIG. It is a content acquisition condition list | wrist which shows whether it needs to be downloaded before drive | working on the road corresponding to a link. For example, the content whose content ID is 01 indicates that it is necessary to be downloaded from the departure of the vehicle 10 until the vehicle 10 has finished traveling on the road corresponding to the fourth link. The content with content ID 04 represents that it may be downloaded after arrival at the destination.

  FIG. 14 shows a download scheduling list obtained by the download scheduling executed in step S460 in FIG. 4 based on the link communication capacity management table generated in FIG. 12 and the content acquisition condition list generated in FIG. Show. For example, it is scheduled so that the content with content ID 02 is downloaded from when the vehicle 10 departs until it finishes traveling on the road corresponding to the first link. According to the content acquisition condition list in FIG. 13, scheduling is originally performed so that content with content ID 03 is also downloaded after the vehicle 10 departs and finishes traveling on the road corresponding to the first link. It should be. However, for example, in the case where wireless communication performance is degraded due to weak radio waves in the first link, two attributes “Necessary acquisition during travel” and “Necessary acquisition prioritized” due to the limitation of the communication capacity in the first link. "Is scheduled so that only content with a content ID of 02 is downloaded. The content with the content ID 03 is managed by the reserved content ID and downloaded after arrival at the destination. Similarly, the download scheduling list is created by performing the same sort on each link up to the destination after the second link.

  FIG. 15 shows an example of a management mode of statistical traffic information including the average link travel time data used in step S560 in FIG. The statistical traffic information is managed in mesh code units and stored in the auxiliary storage device 140. The statistical traffic information for the mesh code # x_1 forms a hierarchical structure, and is largely classified and stored by day type. There are five types of day types, for example, weekdays (general), weekdays (days before holidays), holidays (first day of consecutive holidays), holidays (days during consecutive holidays), and holidays (last days of consecutive holidays). Since the traffic conditions are different for each day type, statistical traffic information is managed for each day type.

As the next layer of the day type, statistical information is stored for each link number of the link included in the mesh area represented by mesh code # x_1. For example, the statistical traffic information stored for the link number # y_1 is further stored by time in the next layer. The statistical traffic information for the time from 0:00 to 1:00, which is one of them, is information of travel time 257 seconds and traffic level 1 in the example shown in FIG. In mesh code # x_1, the time required to travel on the road corresponding to the link represented by link number # y_1 is 257 seconds in the time zone from 0:00 am to 1:00 am This means that the traffic situation during driving is level 1.

  In step S560 in FIG. 5, link travel time data measured in the past from step S8030 to step S8110 in FIG. 8 can be used. The link data described above stores link length and standard travel speed data. Accordingly, FIG. 16 shows a graph obtained by dividing the link length by the link travel time data measured in the past and obtaining the travel speed measured in the past as the y axis and the standard travel speed as the x axis. When traveling according to the standard traveling speed, the traveling speed measured in the past is plotted on a straight line of y = x indicated by a broken line, but in reality, a straight line of y = x as a plurality of points are plotted. Variation occurs. Assuming that an approximate curve estimated from the plurality of points is y = f (x), a travel speed reflecting the driver's past driving characteristics is obtained from the standard travel speed included in the link data. As a result, even for a link representing a road on which the vehicle 10 has not traveled in the past, the link travel time in consideration of the driving characteristics of the driver can be obtained and used in step S560 in FIG.

  In step S550 in FIG. 5, the wireless field strength data measured in the past by the antenna included in the wireless communication module 160 from step S8040 to step S8120 in FIG. 8 may be used. As the radio field strength data measured in the past, it is possible to specify the radio field strength more accurately by using, for example, the result of measuring the radio field strength at predetermined distance intervals in each link.

The navigation device 100 according to the embodiment described above has the following operational effects.
(1) In the navigation device 100, when downloading the update data of the road map data, the download is scheduled in advance for each link constituting the searched route. Therefore, it is not necessary to secure a time for completing the download of the update data before departure, and the update data is smoothly downloaded while moving.

(2) In the download scheduling for downloading road map data update data while moving, the wireless communication performance is taken into consideration. Therefore, even when downloading while moving, there is no need to consume the processing capacity of the CPU 110 for an unnecessary retry process for an unexpected decrease in wireless communication performance.

(3) In download scheduling for downloading road map data update data while moving, parameters such as update data acquisition priority, travel link order, and wireless communication performance and driver driving characteristic history information are provided. Made to take into account the download conditions. Therefore, it can be efficiently downloaded according to the acquisition priority, and the reliability of the scheduling result based on the history data is increased.

---- Modified example ---
The navigation device 100 of the embodiment described above can be modified as follows.
(1) In FIG. 1 described above, the wireless communication module 160 performs wireless communication with the base station 300 via an antenna. However, the wireless communication module 160 is similar to that of the mobile device, like the mobile phone. It may be an external connection device.

(2) In FIG. 4 described above, the communication capacity for each link is calculated in step S440, and the download is scheduled in advance for each link. However, for example, when a mobile phone is used as the wireless communication module 160, the base station 300 covers a wide range of wireless communication, so the communication capacity for each mesh is calculated, and the download is scheduled in advance on a mesh basis. Anyway.

(3) In FIG. 4 described above, when the update data download is executed in step S480, the link travel time measurement and the radio field strength measurement are performed as shown in FIG. However, the link travel time may use the link travel time included in the statistical traffic information shown in FIG. The wireless field strength measurement may use only the wireless field strength data provided by the communication carrier used in step S550 in FIG.

(4) In order to create the graph shown in FIG. 16, the link length included in the link data of the road map data and the link travel time data measured in the past used in step S560 in FIG. The traveling speed measured in the past was calculated. However, the traveling speed measured in the past may be obtained from measurement by a vehicle speed sensor included in the current position detection device 120.

(5) The content positioned as reserved content in FIG. 14 is downloaded by being included in the remaining update data in step S8190 in FIG. However, it may be downloaded until the vehicle 10 starts traveling on the road corresponding to the next link after the reception of the update data scheduled for each link in step S8380. This is useful when traveling on a road corresponding to a certain link for a time exceeding the plan due to a temporary stop, for example.

(6) In the above description of one embodiment and modification, the embodiment in which the present invention is applied to the navigation apparatus 100 has been described. However, the present invention is applied to a PND (Personal Navigation Device) including a wireless communication module. May be. The PND may be a PND mounted on a vehicle or a PND carried by a pedestrian or a bicycle occupant. However, when the present invention is applied to the PND in the form in (4) described above, a PND having a vehicle speed sensor input function is mounted on the vehicle.

(7) The present invention may be applied to a PDA (Personal Digital Assistant), a mobile phone, a portable personal computer, or a portable game machine.

  The above-described embodiment and modifications may be combined. In addition, the present invention is not limited to the device configuration in the above-described embodiment unless the characteristic functions of the present invention are impaired.

The figure which shows the whole structure of the road map data update system containing the navigation apparatus of this Embodiment. The figure which illustrates the structure of the navigation apparatus of this Embodiment. The system block diagram of an information delivery server. The flowchart which shows the road map data update process procedure which CPU of a navigation apparatus performs. The flowchart which shows the content of the subroutine "communication capacity calculation for every link". The flowchart which shows the content of the subroutine "update data download priority setting". The figure which shows an example of the screen which a user can input update data download priority setting. The flowchart which shows the content of subroutine "update data download". The figure which shows an example of the update data list acquired from an information delivery server. The figure which shows an example of a content database. The figure which shows an example of the link driving | running | working order list | wrist produced | generated when a path | route is searched. The figure which shows the management table of communication capacity for every link. The figure which shows a content acquisition condition list. The figure which shows a download scheduling list. The figure which shows an example of the management aspect of statistical traffic information. A graph obtained by using the travel speed measured in the past as the y-axis and the standard travel speed as the x-axis.

Explanation of symbols

10 Vehicle 40 Wide Area Communication Network 100 Navigation Device 110 CPU
115 Auxiliary storage device 120 Current location detection device 130 User input device 140 Auxiliary storage device 150 Display module 160 Wireless communication module 200 Information distribution server 210 Network interface 220 Platform (OS)
230 Maintenance Operation Function Unit 240 Communication Message Processing Unit 250 Data Processing Unit 260 Database 300 Base Station

Claims (4)

A calculation means for calculating a recommended route;
Receiving means for receiving a list of map data to be acquired for the recommended route by communication;
In the list, among a plurality of contents included in the map data, target content to be acquired while the mobile body moves on the recommended route and other content to be acquired while the mobile body is stopped Identification means identified by attributes;
Detecting means for detecting the state of communication for each section of the recommended route when the mobile body moves on the recommended route;
And the attribute, the the moving order of the section in which the moving body moves, on the basis of the above communication state detected for each of the sections, wherein the movable body is divided into each of the plurality of sections while moving said recommended route Scheduling means for acquiring target content before the mobile body starts moving along the recommended route ,
The navigation apparatus , wherein the map data acquired regarding the recommended route is update data for updating a road map regarding the recommended route . The navigation device according to claim 1, wherein
The section that is associated with the position of the target content based on the acquisition condition that each of the target content identified by the attribute should be acquired before which section of the recommended route the mobile body moves Specifying means for specifying based on the movement order;
An allocation unit that allocates a capacity of the update data acquired by the communication for each section based on the state of the communication;
The scheduling means performs the scheduling based on the acquisition condition based on the attribute and the movement order, and the capacity allocated to each section based on the communication state detected for each section. A featured navigation device. The navigation device according to claim 2, wherein
Storage means for storing the communication status detected by the detection means as a status history in association with the section;
The scheduling means performs the scheduling based on the acquisition condition based on the attribute and the movement order, and the capacity of the update data acquired by the communication assigned to each section based on the state history. A navigation device characterized by the above. The navigation device according to claim 2, wherein
A measuring means for measuring an actual moving time when the moving body moves in the section;
The relationship between the actual section speed and the standard section speed obtained based on the actual travel time, the length of the section, and the standard travel time required for the mobile body to travel the section. An estimation means for estimating,
The capacity of the update data acquired by the communication is allocated based on the relationship estimated by the estimation means.

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