Mobile Device Navigation Data Retention for Offline Routing
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Solution Overview
Problem
Mobile devices struggle to provide navigation instructions when a destination is in an area with no wireless network coverage, as they cannot access servers to download map and route data for subsequent navigation sessions.
Innovation Solution
The mobile device retains map and route data from a previous navigation session if the destination is determined to be in a no wireless network coverage area, allowing for subsequent navigation away from the destination without relying on network connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the mobile device erases received map and route data after reaching the destination, then memory is freed for new navigation sessions, but the device cannot access servers to download map and route data for subsequent navigation sessions in areas with no network connectivity
Solution Approach 1:
The mobile device determines whether the destination is located in a no wireless network coverage area before erasing navigation data. If the destination is in such an area, the device retains the map and route data in memory instead of erasing it, thereby preparing for potential subsequent navigation sessions that may require offline access to this data.
2Reliability
If the mobile device retains map and route data in memory, then subsequent navigation sessions can be supported in no-coverage areas, but memory resources are consumed
Solution Approach 1:
The mobile device applies different data retention policies based on the local characteristic of the destination location. Specifically, it checks whether the destination is in a no wireless network coverage area and only retains navigation data when this condition is met, rather than universally retaining data for all destinations. This localized approach ensures memory is preserved when not needed while maintaining navigation reliability where required.
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A mobile device (100) includes processor (710) coupled to memory (714), an input device, an output device, and a wireless transceiver (704, 706). The mobile device (100) can determine whether a destination is in a no wireless network coverage area. If so, then the route data used to provide navigation instructions to the destination is retained in the memory (714) of the mobile device (100). In subsequent navigation, the mobile device (100) can use the route data for navigation to a subsequent destination.