Radio Wave Mapping With Base-Station-Specific Connection Probability
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Solution Overview
Problem
Existing radio wave maps fail to accurately specify the connected external communication device and its varying channel states at a given location due to multiple connectable base stations, leading to inconsistent communication quality in moving bodies.
Innovation Solution
A system comprising in-vehicle devices and a server device that generate and provide radio wave maps by transmitting and receiving probe information, including location, propagation environment, and external device identification, allowing for precise mapping of communication qualities and device connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple base stations are connectable at the same location, then communication coverage and reliability are improved, but the radio wave map cannot accurately specify the connected external communication device and its channel state
Solution Approach 1:
The radio wave map is segmented into multiple entries, each corresponding to a different connectable external communication device (base station) at the same location. Each entry contains device identification information and propagation environment information specific to that device, allowing the system to maintain accurate and differentiated channel state information for multiple base stations simultaneously.
Solution Approach 2:
The patent adds a new dimension to the radio wave map by incorporating external communication device identification information as a distinguishing key. This transforms the map from a simple location-based structure to a multi-dimensional structure that accounts for location, device identity, and propagation environment, enabling precise specification of connected devices even when multiple base stations are available at the same location.
2Quantity of substance
If probe information is collected from multiple moving bodies at the same location, then the radio wave map data coverage is improved, but the data becomes inconsistent due to different connected base stations
Solution Approach 1:
Probe information from multiple moving bodies is segmented and organized into separate records based on the specific external communication device each vehicle connected to. This segmentation allows the system to accumulate comprehensive data coverage while maintaining consistency within each device-specific record, as each record reflects the actual connection state of a particular base station.
Solution Approach 2:
The system uses feedback from probe information collected by multiple moving bodies to continuously update and refine the radio wave map. By comparing and validating data from multiple sources against the segmented structure (location + device ID + propagation environment), the system ensures data consistency while expanding coverage, resolving conflicts through the structured organization of device-specific information.
Data Source
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AI summary
A radio wave map generator device (200) configured to receive probe information from a probe information transmitter device mounted in a moving body and generate a radio wave map, the radio wave map generator device including: a receiving unit (201) configured to receive pieces of the probe information each of which contains location information of the moving body, propagation environment information for the position, and external communication device identification information; a communication speed calculation unit (206) configured to calculate, based on the pieces of the probe information when the external communication device for the position is a first external communication device and a second external communication device, a first communication speed from first propagation environment information between the moving body and the first external communication device, and a second communication speed from second propagation environment information between the moving body and the second external communication device; a connection probability calculation unit (208) configured to calculate, based on the pieces of the probe information, a first connection probability that is a probability of performing wireless communication with the first external communication device at the position, and a second connection probability that is a probability of performing wireless communication with the second external communication device at the position; and a storage unit (204) configured to store the location information, the external communication device identification information, the first communication speed, the second communication speed, the first connection probability, and the second connection probability.