Map Update Server Handling Temporary Road Changes
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Solution Overview
Problem
Conventional map update methods result in unnecessary data communication between onboard terminals and map update servers during temporary road changes, as updates are performed twice before the end of the change, leading to increased data transmission.
Innovation Solution
A method where the map update server instructs the onboard terminal to temporarily use updated data during a temporary road change and revert to pre-change data after the change is completed, reducing data communication by avoiding the distribution of redundant map data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the map update server performs update distribution each time a road change is detected, then the map data can be updated promptly, but unnecessary data communication occurs during temporary road changes
Solution Approach 1:
The system dynamically adjusts the map data update strategy based on the temporal nature of road changes. For temporary road changes, the system switches to a selective update mode that suppresses redundant communications, while maintaining prompt updates for permanent changes. This dynamic adaptation resolves the contradiction by making the update frequency flexible rather than fixed.
Solution Approach 2:
The system changes the update parameter (data distribution frequency) based on the detected road change characteristics. When a temporary road change is detected, the system modifies the update parameter to reduce data communication, while maintaining rapid update capability for permanent changes. This parameter adjustment resolves the contradiction between update speed and communication overhead.
2Loss of information
If the map update server distributes updated data every time a road change occurs, then the onboard terminal has current map information, but data transmission volume increases unnecessarily
Solution Approach 1:
The system extracts and identifies temporary road changes from the set of all road changes, and applies a different update strategy specifically to these temporary changes. By separating temporary changes from permanent changes, the system avoids unnecessary data transmission while maintaining information currency for relevant updates.
Solution Approach 2:
Instead of transmitting redundant updated data for temporary road changes, the system uses a copying approach where the onboard terminal retains the previous valid map data. This eliminates unnecessary data transmission while ensuring the terminal continues to use accurate map information, resolving the contradiction between data currency and transmission volume.
3Measurement precision
If the map update server performs comparison and statistical processing on road data and vehicle trajectories, then road changes can be detected accurately, but processing complexity increases
Solution Approach 1:
The system performs preliminary classification of road changes into temporary and permanent categories before executing the full comparison and statistical processing. This preliminary action filters the data stream, allowing the complex processing to be applied only when necessary, thereby maintaining detection accuracy while reducing overall processing complexity.
Data Source
AI summary
In response to confirmation request from an onboard terminal in a state where updated data after start of a temporary road change is available, a map update server distributes the updated data and instructs the onboard terminal to temporarily use the updated data. In response to the confirmation request in a state where the updated data after end of a temporary road change is available, the server instructs the onboard terminal to use the updated data from before the start of the temporary road change. In response to being instructed to temporarily use the updated data, the terminal uses the updated data that has been distributed. In response to being instructed to use the updated data from before the start of a temporary road change, the terminal temporarily uses the updated data by using map data from before the start of the temporary road change instead of the updated data.