V2V Communication Privacy via Dynamic Power Sequences
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Solution Overview
Problem
Vehicle-to-vehicle communication systems face privacy concerns as they transmit various information, making it possible for unauthorized entities to track vehicles using received signal strength, which can lead to the identification of specific vehicles and their drivers.
Innovation Solution
A vehicle-to-vehicle communication system that digitally signs basic safety messages with a private key and broadcasts them at varying transmit power levels defined by a predetermined sequence, making it difficult for a receiver to associate the certificate with the vehicle based on receive signal strength, thereby preventing tracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vehicles transmit information at constant power levels, then communication reliability is improved, but privacy protection deteriorates as receivers can track vehicles using signal strength
Solution Approach 1:
The patent applies dynamics by transitioning from constant transmit power levels to dynamically varying power levels. The system selects transmit power levels from a sequence that changes over time, preventing receivers from tracking vehicles through consistent signal strength patterns while maintaining communication reliability through structured power variation.
Solution Approach 2:
The patent implements parameter changes by varying the transmit power level parameter according to a predetermined sequence. This sequence defines multiple power levels that the system cycles through, making it difficult for external receivers to associate signal strength with specific vehicles while ensuring reliable communication within the V2V network.
2Object-affected harmful factors
If vehicles use varying transmit power levels to protect privacy, then privacy protection is improved, but communication reliability may deteriorate
Solution Approach 1:
The patent applies periodic action by implementing a predetermined sequence of transmit power levels that cycles through defined values. This periodic variation protects privacy by preventing consistent tracking while maintaining reliability through the structured, predictable nature of the power level changes that remain within acceptable communication thresholds.
Solution Approach 2:
The system dynamically adjusts transmit power levels according to the predetermined sequence, creating time-varying signal characteristics that protect privacy. The dynamic nature of power level selection prevents receivers from using signal strength as a tracking identifier while ensuring that communication remains reliable through controlled variation within the power sequence.
3Object-affected harmful factors
If the system uses a predetermined power level sequence defined by private key values, then privacy protection is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-defining the power level sequence based on private key values before communication occurs. This pre-computation of the power sequence simplifies the real-time operation, as the system only needs to select from the predetermined sequence rather than dynamically computing power levels during transmission, thus limiting the increase in device complexity.
Solution Approach 2:
The predetermined power level sequence acts as an intermediary between the private key and the actual transmit power. Instead of directly using private key values to control power, the system uses the sequence as an intermediate structure that translates cryptographic values into practical power level selections, managing complexity through this intermediary layer.
Data Source
AI summary
A vehicle-to-vehicle communication system includes a controller programmed to digitally sign each of a plurality of basic safety messages (BSMs) using a private key and broadcast each of the BSMs via the transceiver at respective transmit power levels according to a predetermined power level sequence that is defined by one or more values generated from the private key.