Vehicle Communication Device Position Estimation via Unencrypted Coordinates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Vehicle communication devices face increased processing loads due to the need to decrypt entire communication frames to determine if surrounding vehicle information is necessary for services, even when only parts of the data are required, leading to unnecessary decryption and processing overhead.
Innovation Solution
A vehicle communication device and method that estimate the position of surrounding terminal devices using low decimal place latitude/longitude coordinates included in the communication frame, allowing for selective decryption of only necessary data parts, thereby reducing processing load by avoiding unnecessary decryption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the entire communication frame is decrypted to determine whether surrounding vehicle information is necessary for services, then the accuracy of determining whether decryption is necessary is improved, but the processing load increases due to unnecessary decryption
Solution Approach 1:
The patent extracts only the necessary portion (low decimal place latitude/longitude coordinates) from the encrypted data main part and places it in the unencrypted header part. This allows the receiving device to obtain position information without decrypting the entire data main part, thereby reducing processing load while maintaining the ability to determine whether surrounding vehicle information is necessary.
Solution Approach 2:
The patent segments the position information into two parts: high decimal place coordinates (placed in unencrypted header) and low decimal place coordinates (placed in encrypted data main part). This segmentation allows selective decryption of only the necessary low decimal place coordinates when high precision is required, rather than decrypting the entire data main part.
2Productivity
If low decimal place latitude/longitude coordinates are included in the unencrypted header part, then the processing load is reduced by avoiding unnecessary decryption, but the position precision is degraded due to loss of high decimal place information
Solution Approach 1:
The patent segments position information into high decimal place coordinates (for general area identification) and low decimal place coordinates (for precise position). The high decimal place coordinates are placed in the unencrypted header part to reduce processing load, while the low decimal place coordinates are placed in the encrypted data main part for when precise position information is required.
Solution Approach 2:
The patent applies different encryption levels to different parts of the position information based on their required precision. The header part contains unencrypted low-precision coordinates for general positioning, while the data main part contains encrypted high-precision coordinates for detailed position information, allowing selective decryption based on actual needs.
3Reliability
If all surrounding vehicle data is decrypted to check service necessity, then the reliability of service determination is improved, but the energy consumption increases due to extensive decryption operations
Solution Approach 1:
The patent extracts the essential position information (low decimal place latitude/longitude coordinates) from the encrypted data main part and places it in the unencrypted header part. This extraction enables the receiving device to determine whether surrounding vehicle information is necessary without performing full decryption, thereby reducing energy consumption while maintaining reliable service determination.
Solution Approach 2:
The patent performs preliminary placement of position information in two different encryption states before transmission. The high decimal place coordinates are pre-placed in the unencrypted header part, allowing early determination of service necessity without subsequent decryption operations, thus reducing overall energy consumption.
Data Source
AI summary
A vehicle communication device includes: a position specification unit that configured to specifies coordinates of latitude and longitude of a subject vehicle as position information; a receiving unit that receives the communication frame transmitted from a surrounding terminal device, the communication frame including, in a region other than the data main part, low decimal place latitude/longitude coordinates that are low decimal place part of coordinates of latitude and longitude of the surrounding terminal device and that are not encrypted; and a surrounding terminal device position estimating unit that estimates coordinates of latitude and longitude of the position of the surrounding terminal device based on the coordinates of latitude and longitude of the subject vehicle and the low decimal place latitude/longitude coordinates of the surrounding terminal device.