Waypoint Map Data Preloading for Navigation Devices
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Solution Overview
Problem
Wireless communications devices face challenges in efficiently downloading and rendering detailed maps in real-time, especially at high speeds, due to limited network bandwidth and availability, which hinders effective navigation at key intersections or decision points.
Innovation Solution
A method and system for preloading map data for waypoints along a route by determining the route, identifying critical waypoints, and proactively downloading and caching map data for these areas, using a portable electronic device with a GPS chipset and RF transceiver, to ensure real-time availability of navigationally significant maps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If map data is downloaded in real-time during high-speed travel, then network bandwidth is utilized efficiently, but map detail availability at key intersections deteriorates
Solution Approach 1:
The system performs preliminary actions by downloading and caching map data for upcoming waypoints before the device reaches them. The map data download manager identifies future waypoints along the travel route and initiates downloads in advance, ensuring that detailed maps are available when needed at key intersections and decision points, rather than attempting to download them in real-time during high-speed travel
2Measurement precision
If detailed maps are downloaded for all areas, then navigation accuracy improves, but network bandwidth consumption increases
Solution Approach 1:
The system applies local quality by selectively downloading detailed map data only for specific locations that require high precision - namely, upcoming waypoints, intersections, and decision points along the travel route. Rather than downloading detailed maps for all areas uniformly, the map data download manager targets specific geographic regions where navigation accuracy is critical, thereby optimizing network bandwidth consumption while maintaining navigation precision where it matters most
3Productivity
If map data is cached locally, then real-time navigation performance improves, but device memory requirements increase
Solution Approach 1:
The system performs preliminary actions by caching map data for upcoming waypoints before the device arrives at those locations. The map data download manager predicts future positions based on current trajectory and speed, then proactively caches only the map tiles needed for those specific upcoming locations, rather than pre-caching entire map regions or all possible waypoints
Solution Approach 2:
The system applies partial action by downloading and caching only a subset of map data - specifically, map tiles for upcoming waypoints and decision points - rather than caching complete map datasets. This selective approach ensures real-time navigation performance by having critical data ready locally, while minimizing device memory usage by excluding unnecessary map regions
Data Source
AI summary
A method of downloading map data to a portable electronic device entails determining a route, identifying waypoints along the route, and downloading and caching map data for the waypoints along the route. The map data for areas around each of the waypoints (intersections, decision points) are thus preloaded prior to the device arriving at or near each waypoint. This ensures that the device has locally cached all the map data needed to render a navigationally useful map of the area around each waypoint.