Communication Terminal Map Update State Management
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Solution Overview
Problem
Existing communication terminals lack effective management of map information updates, leading to unnecessary data acquisition or failure to acquire necessary data, resulting in suboptimal movement guidance due to unmanaged update states and version discrepancies between terminal and server map information.
Innovation Solution
A communication terminal system that includes a memory for storing map information, a map updating unit, area update information acquisition, area identification, guidance information request, and movement guidance units, allowing for bidirectional communication to manage map information updates and request only necessary guidance information from a server, ensuring accurate and efficient movement guidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If map information is updated using prior art techniques, then some map information may be updated, but unnecessary mesh data is acquired or necessary mesh data is not acquired due to lack of update state management
Solution Approach 1:
The patent applies preliminary action by managing the update state of map information before requesting mesh data from the server device. The communication terminal determines which mesh data is necessary based on the update state management, ensuring that only required data is acquired. This prevents both the failure to acquire necessary mesh data and the acquisition of unnecessary mesh data, thereby improving reliability while avoiding information loss.
2Reliability
If mesh data is acquired from server device without update state management, then guidance information may be obtained, but communication costs increase due to acquisition of unnecessary data
Solution Approach 1:
The patent applies the extraction principle by selectively acquiring only the necessary mesh data from the server device based on update state management. Instead of acquiring all mesh data or using a fixed update approach, the system extracts and requests only the specific mesh data that is necessary for accurate movement guidance. This reduces communication costs by eliminating unnecessary data transfer while ensuring guidance information availability.
3Device complexity
If map information update is performed without tracking update state, then updating process is simple, but it is impossible to determine whether an area requires mesh data
Solution Approach 1:
The patent applies preliminary action by implementing update state management that tracks which areas have been updated and which have not. Before requesting mesh data from the server device, the system determines the update state of each area, allowing it to identify which areas require mesh data acquisition. This approach maintains a manageable update process while enabling accurate determination of mesh data requirements, thus avoiding information loss.
Data Source
AI summary
Movement guidance information for performing traveling guidance for a vehicle is requested to a guidance information delivering server device based on an area update table and an area identification table for managing an update state of map information in a communication terminal, and traveling guidance for the vehicle is performed based on the movement guidance information delivered from the guidance information delivering server device in response to the request.