Lane-Level Navigation Prefetch for Poor-Network Route Segments
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Solution Overview
Problem
Existing navigation systems face challenges in providing timely and accurate lane-level navigation due to large data amounts, leading to slow updates and poor user experience, especially in areas with poor network connectivity such as tunnels or canyons.
Innovation Solution
A navigation system that segments the recommended route into smaller segments, obtaining high-precision road data for each segment, particularly in areas with poor connectivity, ensuring timely and accurate lane-level navigation by switching to road-level navigation when high-precision data is unavailable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If lane-level navigation data is downloaded completely before navigation, then navigation accuracy is improved, but download time becomes too long and cannot be updated in timely manner
Solution Approach 1:
The patent segments the navigation route into multiple route segments and downloads high-precision road data for each segment separately as needed. Instead of downloading all lane-level navigation data at once, the system divides the route into segments (e.g., current segment, next segment, and subsequent segments) and downloads data for each segment progressively. This segmentation approach reduces the initial download time while maintaining navigation accuracy by ensuring high-precision data is available for the segments that will be traversed.
2Measurement precision
If high-precision road data is obtained for all route segments, then lane-level navigation accuracy is improved, but data amount becomes large and network consumption increases
Solution Approach 1:
The patent applies local quality by obtaining high-precision road data only for specific route segments that are relevant to the current navigation context, rather than for the entire route. The system determines which segments require high-precision data (current segment, next segment, and segments containing poor network connection areas) and downloads data only for those localized areas. This approach maintains lane-level navigation accuracy where needed while significantly reducing the overall data amount and network consumption.
3Measurement precision
If the system waits for high-precision road data before displaying navigation, then navigation accuracy is improved, but navigation display is delayed especially in poor network areas
Solution Approach 1:
The patent implements preliminary action by downloading high-precision road data for route segments in advance, before the vehicle actually reaches those segments. The system identifies segments that will be traversed and downloads their high-precision data proactively, so that when the vehicle arrives at those segments, the data is already available for immediate display. This preliminary download approach ensures both high navigation accuracy and fast display speed, eliminating delays caused by waiting for data during navigation.
Solution Approach 2:
The patent applies dynamics by adaptively adjusting the navigation data display strategy based on network conditions and vehicle location. The system dynamically determines whether to display lane-level navigation or road-level navigation based on the availability of high-precision road data for the current segment. When high-precision data is available, lane-level navigation is displayed; when it's not available (e.g., in poor network areas), the system dynamically switches to road-level navigation to ensure continuous navigation display without delays.
4Productivity
If the system segments the route and downloads data by segment, then download speed is improved, but system complexity increases
Solution Approach 1:
The patent segments the navigation route into multiple route segments and downloads high-precision road data for each segment separately. The system divides the route into segments (current segment, next segment, and subsequent segments) and downloads data for each segment progressively as the vehicle approaches. This segmentation approach significantly improves download speed by reducing the amount of data that needs to be downloaded at once, while the complexity is managed through automated segment identification and sequential download logic.
Data Source
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Figure 1B
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AI summary
This application provides a navigation system and method, and an electronic device. A server may determine a recommended route based on a start location of an electronic device and a destination, determine a poor-network-connection road section in the recommended route, and then determine a no-network-connection route segment in the recommended route, where the no-network-connection route segment includes the poor-network-connection road section. When the electronic device moves to a first route segment in the recommended route, the electronic device may obtain high-precision road data of the no-network-connection route segment from the server, and display a lane-level navigation route of the no-network-connection route segment based on the high-precision road data of the no-network-connection route segment. When the electronic device moves to the no-network-connection route segment in the recommended route, the electronic device may obtain high-precision road data of a second route segment from the server, and display a lane-level navigation route of the second route segment based on the high-precision road data of the second route segment. In this solution, the electronic device can quickly and accurately display a lane-level navigation route.