V2V Data Transfer Using Delta Information for Soft Combining
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Solution Overview
Problem
Conventional soft combining methods in vehicle-to-vehicle communication cannot effectively process status reports that differ from each other, limiting the reliability of data transmission in noisy channels.
Innovation Solution
A method that determines delta information between data blocks, provides it with error protection, and applies it to previous data blocks to align their information content, allowing for soft combining of similar but not identical signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional soft combining methods are used for vehicle-to-vehicle communication, then the processing of status reports is simplified, but the reliability of data transmission deteriorates when status reports differ from each other
Solution Approach 1:
The status report is segmented into a common part (identical across multiple reports) and a differential part (varying between reports). The common part is transmitted once and reused, while only the differential part is transmitted in subsequent reports. This segmentation allows the receiver to efficiently combine multiple status reports by processing only the varying portions, thereby improving data transmission reliability without excessive processing complexity.
Solution Approach 2:
Multiple status reports are merged by identifying and extracting the common information that appears in all reports. This common information is combined with the differential information from each report to form a comprehensive data set. The merging process enables the system to achieve higher transmission reliability by leveraging redundant common information while maintaining efficiency through selective processing of differential parts.
2Loss of time
If status reports are transmitted frequently to improve real-time communication, then the information freshness is improved, but the channel resource consumption increases
Solution Approach 1:
Instead of transmitting entire status reports repeatedly, the system applies local quality by transmitting only the differential part that contains new or changed information. The common part that remains unchanged across multiple reports is transmitted once and reused by the receiver. This approach maintains information freshness for real-time communication while significantly reducing channel resource consumption by eliminating redundant transmissions.
Solution Approach 2:
The system performs partial action by transmitting only the necessary differential portion of status reports rather than complete reports. This partial transmission strategy provides sufficient information for real-time communication needs while avoiding the excessive resource consumption that would result from transmitting full status reports at every interval.
3Reliability
If error protection data is added to all status reports, then the transmission reliability is improved, but the data transmission overhead increases
Solution Approach 1:
Error protection is segmented and applied selectively rather than uniformly to all status reports. The system identifies the differential part of status reports and applies error protection primarily to this varying portion, while the common part benefits from the error protection already applied to previous transmissions. This segmentation reduces overall data transmission overhead while maintaining reliable error protection where it is most needed.
Solution Approach 2:
The system discards redundant error protection data that would be repeated in every status report and recovers it by reusing error protection mechanisms from previous transmissions. By identifying and discarding the common protected information that doesn't need retransmission, the system reduces overhead while maintaining the reliability benefits of error protection through intelligent recovery and reuse of protected data.
Data Source
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AI summary
For autonomous or cooperative driving, it is increasingly necessary to exchange data between vehicles via wireless communication. Vehicle-to-vehicle (V2V) radio communication based on WLAN p is currently under development. The invention enables the application of soft combining technology, known from mobile communications, to the use case of transmitting different status messages in WLAN p V2V communication. In the method for the digital transmission of data blocks from a transmitting station (31) to a receiving station (32), delta information is generated on the transmitting side, indicating where a subsequent data block differs from the preceding data block (83). The delta information is added to the subsequent data block in an error-protected manner and transmitted. The received first data block and at least one extended subsequent data block are stored in the receiving station (31) (81, 82).Then the delta information of the at least one extended additional data block is recovered (83) and applied to the stored previous data block. This makes it comparable with the at least one additional data block. Then a soft combining of the received additional data block and the converted previous data block takes place. The useful information of the additional data block is recovered from the combined data block (86).