Radio Wave Map Generation for Predictive Connection Quality
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Solution Overview
Problem
In wireless communication, especially for moving bodies like vehicles, radio wave interference and varying transmission/reception levels due to fading and movement lead to unpredictable communication quality, necessitating proactive measures based on location-specific assessments.
Innovation Solution
A radio wave map generator device that receives probe information from moving bodies to calculate communication speeds and connection probabilities, and a provider device that responds with guaranteed or expected communication speeds based on usage type, enabling informed wireless communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If probe information is collected from multiple external communication devices at each position, then communication speed assessment accuracy is improved, but device complexity and data processing load increase
Solution Approach 1:
The patent segments the radio wave map into multiple positions, with each position containing probe information from multiple external communication devices. This segmentation allows independent processing and storage of data for each position, making the complex data manageable and enabling parallel processing operations.
Solution Approach 2:
The patent performs preliminary calculation of communication speeds for multiple external communication devices at each position before making connection decisions. By pre-calculating these speeds and storing them in the radio wave map, the system avoids real-time computation complexity during actual communication establishment.
2Measurement precision
If communication speed is calculated for multiple external communication devices, then connection probability calculation accuracy is improved, but information processing time increases
Solution Approach 1:
The patent calculates and stores communication speeds for multiple external communication devices in advance during the radio wave map generation phase. This preliminary calculation eliminates the need for time-consuming real-time computations when determining connection probabilities, significantly reducing information processing time during actual use.
Solution Approach 2:
The patent uses the pre-calculated communication speeds as feedback to determine connection probabilities. The system compares the communication speeds of multiple external communication devices and uses this feedback information to select the most suitable device for connection, improving both accuracy and efficiency.
3Reliability
If radio wave map includes detailed probe information from multiple devices, then communication reliability is improved, but data transmission volume increases
Solution Approach 1:
The patent extracts only the essential probe information elements needed for communication assessment from multiple external communication devices, such as communication speed, signal strength, and connection status. By extracting only critical data rather than storing all raw probe information, the system maintains communication reliability while reducing data transmission volume.
Solution Approach 2:
The patent applies local quality by organizing probe information specific to each position and external communication device combination. Each position in the radio wave map contains tailored information about the external communication devices available at that location, providing locally optimized data that improves reliability without requiring uniform detailed information everywhere.
4Productivity
If connection probability is calculated based on multiple communication speeds, then wireless communication optimization is improved, but calculation complexity increases
Solution Approach 1:
The patent uses communication speeds as feedback to determine connection probabilities. The system compares the communication speeds of multiple external communication devices and uses this feedback to identify the device with the optimal speed, simplifying the connection decision process while maintaining optimization.
Solution Approach 2:
The patent changes the parameter used for connection decision from a direct comparison of multiple communication speeds to a calculated connection probability that incorporates these speeds. This parameter transformation simplifies the overall calculation complexity by providing a single probabilistic metric for connection decisions.
Data Source
AI summary
A radio wave map generator device includes a receiving unit, a communication speed calculation unit, a connection probability calculation unit, and a storage unit. The receiving unit is configured to receive pieces of probe information each of which contains location information, propagation environment information, and external communication device identification information. The communication speed calculation unit is configured to calculate a first communication speed, and a second communication speed. The connection probability calculation unit is configured to calculate a first connection probability, and a second connection probability. The storage unit is configured to store the location information, external communication device identification information, the first communication speed, the second communication speed, the first connection probability, and the second connection probability.