Navigation System Data Packet Sequencing for Bandwidth Optimization
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Solution Overview
Problem
Existing navigation systems for motor vehicles with offboard data memory struggle to efficiently transmit and display visual map information, particularly in terms of resolution, location, and bandwidth, leading to suboptimal user experience and increased data transfer times.
Innovation Solution
A method for selecting and sequencing data packets of visual map information based on the display resolution, vehicle location, assumed route, and communication bandwidth, ensuring that only necessary data is transmitted in a timely manner, with prioritization of closer regions and additional data at route junctions, using a combination of wired and wireless communication connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If all visual map information data packets are transmitted to the motor vehicle, then the completeness of map information is improved, but the data transmission time and bandwidth consumption increase significantly
Solution Approach 1:
The visual map information is divided into multiple data packets representing different geographic regions. The system selectively transmits only those data packets corresponding to regions relevant to the current route and display resolution, rather than transmitting all available map data. This segmentation approach reduces transmission time while maintaining information completeness for the areas of interest.
Solution Approach 2:
The system pre-calculates and pre-selects which data packets should be transmitted based on the assumed route, display resolution, and vehicle location before transmission begins. This preliminary selection ensures that only necessary data packets are transmitted, optimizing both transmission time and bandwidth usage while ensuring all required map information is available.
2Measurement precision
If high resolution data packets are transmitted, then the display quality is improved, but the bandwidth consumption and transmission time increase
Solution Approach 1:
The system transmits data packets at different resolution levels based on their importance and the display requirements. High-resolution data packets are transmitted for regions that are critical to the navigation (such as current location and upcoming route sections), while lower-resolution packets are used for less critical areas. This local quality approach optimizes display quality for important regions while reducing overall bandwidth consumption.
3Speed
If data packets for future route sections are transmitted in advance, then the responsiveness of the navigation system is improved, but the bandwidth usage increases
Solution Approach 1:
The system pre-transmits data packets for future route sections based on the assumed route and estimated travel time. By calculating which regions will be needed soon and transmitting their data packets in advance, the system ensures responsive navigation display without transmitting all possible future map data. This balanced approach improves system responsiveness while controlling bandwidth usage through selective pre-transmission.
4Productivity
If data packets are selected based on proximity to vehicle location, then the transmission efficiency is improved, but the map information completeness for route junctions may be reduced
Solution Approach 1:
The system applies enhanced transmission priorities to specific locations such as route junctions and intersections, regardless of their distance from the current vehicle location. While general data packet selection is based on proximity to the vehicle, the system identifies route junctions in advance and ensures their corresponding data packets are transmitted with higher priority or in advance, maintaining information completeness at critical navigation points while preserving overall transmission efficiency.
Data Source
AI summary
In a method for operating a navigation system for a motor vehicle having an offboard data memory, spatially separated from the motor vehicle, having data packets of visual map information, divided by region, as well as a display arranged in the motor vehicle, a selection of data packets provided for transmission to the motor vehicle and/or their sequence occur as a function of the resolution of the display, the location of the motor vehicle, an assumed route of the motor vehicle and/or the bandwidth of a communication connection provided for the transmission, the selected data packets being transmitted to the motor vehicle (e.g., in the selected sequence), and visual map information from data packets transmitted to the motor vehicle being represented by the display.