Dynamic RF Transaction Control for Connected Vehicles
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Solution Overview
Problem
The connected-vehicle radio-frequency environment is spectrum- and bandwidth-limited, leading to unreliable unicast performance in transactions, such as vehicle tolling, due to factors like topology, traffic conditions, and RF congestion, resulting in missed transactions and increased enforcement costs.
Innovation Solution
A method to control the RF transaction region by determining characteristics like the RF environment and transaction loss rate, and adjusting parameters like the perimeter, message rate, and transmission power of user equipment to optimize message transmission and reception between user equipment and roadside equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vehicles transmit multiple transaction-inducing messages to overcome poor unicast performance, then the probability of successful transaction increases, but channel congestion and interference increase, degrading the ability to receive transaction-inducing messages and vehicle safety messages
Solution Approach 1:
The system dynamically adjusts transmission parameters including message rate, transmission power, and geographic perimeter of the transaction region based on real-time RF environment conditions. This allows the system to adapt to changing traffic conditions and RF congestion levels, optimizing transaction success while minimizing interference to other messages
Solution Approach 2:
The system changes multiple transmission parameters simultaneously including message rate, transmission power level, and transaction region perimeter. These parameter changes are coordinated to improve transaction reliability while controlling the harmful effects of congestion and interference on the RF channel
2Reliability
If transmission power is increased to improve message reception reliability, then transaction success rate improves, but interference to other signals increases
Solution Approach 1:
Transmission power is adjusted as one of multiple coordinated parameters including message rate and geographic perimeter. This allows the system to achieve reliable message reception while distributing the interference impact across different spatial and temporal dimensions, reducing overall harm to the RF environment
3Reliability
If message transmission rate is increased to ensure transaction completion, then transaction success rate improves, but channel congestion increases
Solution Approach 1:
The message transmission rate is dynamically adjusted based on real-time RF environment conditions and coordinated with changes in transmission power and transaction region perimeter. This dynamic coordination ensures transaction completion while managing the overall congestion level on the channel
Solution Approach 2:
Message rate is changed in coordination with other transmission parameters including power level and geographic perimeter. This multi-parameter approach allows the system to achieve transaction reliability while distributing congestion effects across different dimensions of the communication system
Data Source
AI summary
A method of completing a transaction for a UE includes: receiving, at roadside equipment, a position message indicating a position of the UE; receiving, at the roadside equipment, a transaction message from the UE, the transaction message being separate from the position message and including an encrypted token containing information associated with the UE to enable completion of the transaction; determining that the position message and the transaction message are cryptographically bound; decrypting the encrypted token to produce a decrypted token; determining a presence of the UE in a transaction region; and completing the transaction using the information contained in the decrypted token in response to determining that the position message and the transaction message are cryptographically bound and determining the presence of the UE in the transaction region.