Telematics Vector Difference Encoding for Bandwidth Reduction
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Solution Overview
Problem
Current telematics systems using two-way radio networks for tracking vehicle fleets face challenges in managing data bandwidth, particularly with frequent location reports, which can occupy the entire bandwidth and complicate voice communication requirements, necessitating a method to reduce data transmission while maintaining efficient communication.
Innovation Solution
The method involves determining a vehicle's location and calculating displacement vectors, storing these vectors in data packets, and transmitting the vector differences at predetermined intervals, which minimizes the number of bits required for data transmission and allows for efficient recreation of the vehicle's path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If frequent location reports are transmitted using two-way radio networks, then vehicle tracking accuracy is improved, but data bandwidth is exhausted and voice communication is compromised
Solution Approach 1:
The patent extracts only the essential tracking information needed for fleet management by transmitting discrete location points rather than continuous data streams. The telematics device determines vehicle location at specific intervals and transmits only these discrete position data points, eliminating redundant information while maintaining adequate tracking accuracy for monitoring vehicle routes and delivery locations.
Solution Approach 2:
The system applies partial action by transmitting location data at predetermined intervals rather than continuously. Location reports are sent only at specific time points or when the vehicle reaches predetermined locations, providing sufficient tracking information for fleet management purposes without occupying the radio channel continuously, thus preserving bandwidth for voice communications.
2Reliability
If location data is transmitted frequently, then tracking reliability is improved, but call set-up time and network overhead increase
Solution Approach 1:
The telematics system implements periodic action by transmitting location reports at predetermined time intervals or when the vehicle reaches predetermined locations. This periodic transmission schedule ensures reliable tracking data is obtained at regular intervals sufficient for fleet management, while avoiding excessive call set-up overhead that would result from more frequent transmissions.
3Measurement precision
If data transmission bandwidth is increased to accommodate frequent location reports, then tracking precision is improved, but voice communication availability deteriorates
Solution Approach 1:
The system uses partial action for data transmission by sending location information only at predetermined intervals or locations rather than continuously. This partial transmission approach provides adequate tracking precision for fleet management while leaving the radio channel available for voice communications when needed, maintaining system versatility.
Data Source
AI summary
Systems, methods, and devices relating to tracking a vehicle on its journey. At predetermined reporting time intervals, the vehicle's location is determined using GNSS and a current vector is calculated based on a current location and an immediately preceding location. The difference between the current vector and the immediately preceding vector is then determined and this difference is stored in the data packet. The data packet is transmitted to the base station using a two-way radio data link at select predetermined transmission time intervals. The data in the data packet is encoded to minimize the number of bits needed to store each data point.