Pedestrian V2X Device Power Management via Map-Based Activation
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Solution Overview
Problem
Pedestrian V2X devices face challenges in power consumption due to unnecessary activation, as existing methods like activating based on V2X messages, movement sensors, or GNSS visibility are ineffective in determining when the device is near a road, leading to battery drain.
Innovation Solution
A method that determines the pedestrian's location relative to a road using a physical map and heatmap analysis to power down V2X functionality by adjusting the receiver operation cycle, transmitter activation state, and GNSS sampling rate, ensuring low power operation by deactivating components when not needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If V2X functionality is continuously activated to ensure safety monitoring, then reliability is improved, but power consumption increases
Solution Approach 1:
The V2X functionality transitions between active and inactive states based on dynamic assessment of pedestrian location and road proximity. The system continuously evaluates GPS coordinates against map data to determine when activation is necessary, making the power consumption adaptive rather than static.
Solution Approach 2:
The system performs preliminary location assessment using GPS and map matching before activating V2X functionality. By pre-determining whether the pedestrian is near a road based on location data, the system avoids unnecessary activation and prepares the appropriate state in advance.
2Ease of operation
If V2X functionality is activated based on simple criteria like receiving V2X messages or movement detection, then ease of operation is improved, but reliability deteriorates due to false activation
Solution Approach 1:
The system uses feedback from multiple sources including GPS location, map data matching, and pedestrian state information to continuously refine activation decisions. This multi-layered feedback mechanism ensures accurate determination of road proximity while maintaining simple operation for the end user.
Solution Approach 2:
Map data serves as an intermediary between raw GPS coordinates and V2X activation decisions. The system matches pedestrian location against stored map road networks to determine proximity, providing a reliable intermediate assessment that bridges simple location data and complex activation logic.
3Ease of operation
If V2X functionality is activated based on GNSS satellite visibility, then ease of operation is improved, but reliability deteriorates in urban environments
Solution Approach 1:
Map data acts as an intermediary that translates GPS coordinates into meaningful road proximity information. Even when GNSS visibility is limited, the system can accurately determine road proximity by matching available location data against map road networks, compensating for satellite reception limitations in urban canyons.
Solution Approach 2:
The system uses a digital copy of road network data from maps to represent physical road locations. By comparing pedestrian GPS coordinates against this digital road map, the system can determine proximity to roads without requiring direct line-of-sight to satellites, effectively copying the spatial relationships from map data to guide activation decisions.
Data Source
AI summary
Methods for lowering the power consumption of a battery-operated pedestrian V2X device, comprising: determining a location of the pedestrian relative to a road using a physical map, determining whether a movement of the pedestrian is consistent using a heatmap, and based on the location of the pedestrian relative to the road and on the consistency of the pedestrian movement, powering down a V2X functionality inside the pedestrian V2X device by setting a V2X receiver operation cycle, a V2X transmitter activation state and a Global Navigation Satellite System (GNSS) sampling rate, thereby enabling low power operation of the pedestrian V2X device.