Communication Terminal Map Update System
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Solution Overview
Problem
Existing navigation systems face delays and errors in providing movement guidance due to outdated map information on communication terminals, which are not updated in a timely manner during center route searches, leading to incorrect or missing guidance for newly constructed roads and intersections.
Innovation Solution
A communication terminal and server device system that enables two-way communication to identify and update area identification information section-by-section, allowing the terminal to request and receive the latest guidance information from the server, reducing the time required for guidance updates and preventing erroneous guidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If center route search is performed using server device, then route can be searched based on latest map information, but communication terminal cannot provide appropriate travel guidance along guided route due to old version map information
Solution Approach 1:
The patent divides map information into multiple mesh sections and tracks version information for each section. The communication terminal compares the version of each mesh section with the server device and selectively requests updates only for outdated sections, enabling the terminal to maintain accurate map information for guidance while using the server's latest data for route search.
Solution Approach 2:
The patent performs preliminary comparison of map information versions between the communication terminal and server device before route search. By identifying which mesh sections need updates in advance and requesting them beforehand, the system ensures that the terminal has the necessary guidance information ready when the route is established, eliminating guidance failures.
2Productivity
If navigation device determines whether latest version of mesh data needs to be obtained after route search, then route can be searched, but it requires very long time to obtain required mesh data and guidance cannot be provided during this period
Solution Approach 1:
The patent performs version comparison and update determination before the route search process. By identifying which mesh sections require updates in advance and requesting them concurrently with or before route search, the system eliminates the delay that would otherwise occur during guidance provision, as the necessary data is already prepared.
Solution Approach 2:
The patent implements a dynamic version comparison mechanism that continuously monitors and updates map information versions. This allows the system to adaptively determine which mesh sections need updates based on current conditions, optimizing the timing of data acquisition to minimize impact on route search and guidance provision.
3Device complexity
If communication terminal uses old version map information, then device complexity is reduced, but guidance errors occur for newly constructed roads and intersections
Solution Approach 1:
The patent segments map information into multiple mesh sections with individual version tracking. This allows the terminal to maintain a simplified overall structure while implementing selective updates for specific sections that have changed, balancing complexity reduction with guidance accuracy for newly constructed roads and intersections.
Solution Approach 2:
The patent implements a feedback mechanism where the communication terminal compares its local mesh version information with the server device's versions and automatically determines which sections need updates. This feedback loop ensures the terminal maintains accurate guidance information for new infrastructure without requiring complete map reloads, improving reliability while managing complexity.
Data Source
AI summary
A communication terminal is connected to a server and provides movement guidance for a mobile unit based on guidance information delivered from the server. The terminal requests the server for update information for updating area identification information that identifies a section corresponding to an update target area and a section not corresponding to the update target area on a section-by-section basis. The update target area is an area whose terminal-side map information included in the communication terminal is an older version. The terminal updates the area identification information based on the update information transmitted from the server, requests the server for guidance information for providing movement guidance for the mobile unit based on the updated area identification information, and provides the movement guidance for the mobile unit based on the guidance information delivered from the server.