Mobile Terminal Position Sensing for Left-Behind Vehicle Detection

The patent divides the position determination task into multiple independent evaluation signals (e.g., signal strength, signal quality, time of flight, angle of arrival) that can be processed separately and then combined. Each signal type provides a different aspect of position information, and their segmentation allows for more comprehensive and accurate position determination without overwhelming the processing system.

The patent merges multiple evaluation signals from different sources (vehicle sensors and mobile terminal sensors) to form a composite position determination. By combining these signals through evaluation unit(s), the system achieves higher measurement precision than any single signal could provide alone, while managing complexity through structured signal integration.

The patent implements periodic position evaluation triggered by specific events (e.g., vehicle door opening/closing, engine start/stop, mobile terminal entering/exiting vehicle proximity) rather than continuous monitoring. This event-driven periodic evaluation maintains high reliability by checking position at critical moments while significantly reducing processor energy consumption compared to continuous monitoring.

The system performs preliminary evaluation of position signals and only initiates full position determination when predefined conditions or events are detected. This preliminary filtering action allows the system to maintain readiness for reliable detection while avoiding unnecessary processing and energy consumption during periods when position changes are unlikely or not critical.