Vehicle Probe Data Upload Prioritization Under Limited Bandwidth
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Solution Overview
Problem
The interruption of data transmission in road sections where feature-representing data is collected can result in insufficient data on the server side, due to limited channel capacity and storage capacity on the vehicle, leading to potential data loss.
Innovation Solution
A data collecting device that prioritizes the transmission of probe data over images by setting a dedicated communication band based on the amount of stored probe data, ensuring all probe data is transmitted before images, and widening the communication band as probe data storage increases, to prevent data loss during transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sensor information is uploaded to external device depending on line speed change, then transmission efficiency is improved, but data completeness deteriorates due to possible interruption in road sections
Solution Approach 1:
The system performs preliminary analysis of sensor information to generate probe data before transmission. This probe data serves as a preliminary representation that can be transmitted efficiently while preserving the essential feature information needed for map generation, thus maintaining data completeness even with interrupted transmissions.
Solution Approach 2:
The system changes the parameter of data representation from raw sensor information to processed probe data. This transformation reduces data size and enables more efficient transmission while maintaining the critical feature information, resolving the contradiction between transmission efficiency and data completeness.
2Reliability
If probe data is prioritized for transmission over images, then feature-representing data completeness is improved, but communication band allocation complexity increases
Solution Approach 1:
The system uses feedback from the communication band state and stored probe data amount to dynamically adjust transmission priorities. The communication band setting unit monitors the communication channel state and adjusts the probe communication band accordingly, ensuring probe data transmission is prioritized when necessary while managing communication resources efficiently.
Solution Approach 2:
The communication band allocation is made dynamic rather than static. The probe communication band is adjusted based on real-time conditions including the amount of stored probe data and communication channel state, allowing the system to adapt to varying transmission needs and resolve the complexity issue through flexible resource management.
3Speed
If communication band is widened as probe data storage increases, then transmission speed is improved, but energy consumption increases
Solution Approach 1:
The system dynamically changes the communication band parameter based on the amount of stored probe data. When probe data accumulation reaches certain thresholds, the communication band is widened to accelerate transmission, preventing data loss while managing energy consumption through conditional rather than continuous high-speed transmission.
Data Source
AI summary
A data collecting device includes a processor configured to store an image representing an area around a vehicle and generated by a camera mounted on the vehicle during travel of the vehicle 2 in a memory, generate probe data representing a predetermined feature detected from the image in the area around the vehicle, store the generated probe data in the memory, set a probe communication band, depending on the amount of a set of probe data stored in the memory, and transmit the set of probe data to a server via a communication device, using the probe communication band, prior to a set of images stored in the memory.