V2X Message Scheduling Using Reception Feedback Under Channel Load
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Solution Overview
Problem
The limited frequency spectrum in V2X communication systems leads to channel congestion, resulting in decreased communication performance and increased packet error rates and latency, which affects the efficiency of driver assistance and automated driving systems.
Innovation Solution
A feedback-based mechanism is implemented to dynamically adjust the transmission frequency of V2X messages based on the channel reliability, using reception indicators and priority thresholds to optimize network stability and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional V2X messages are transmitted for cooperative driving functions, then driver assistance and automated driving performance is improved, but channel congestion increases leading to decreased communication performance
Solution Approach 1:
The patent implements dynamic transmission priority adjustment based on reception indicators. The transmission priority of V2X message objects is not fixed but adapts in real-time according to channel conditions and reception feedback, allowing the system to optimize between reliability and throughput dynamically
Solution Approach 2:
The patent introduces a feedback mechanism where reception indicators are generated based on feedback from recipient stations about successfully received V2X messages. This feedback loop enables sender stations to adjust transmission priorities based on actual channel conditions, resolving the contradiction by using information about reception status to optimize transmission behavior
2Reliability
If V2X message transmission frequency is increased to improve message delivery reliability, then packet error rate increases and communication latency increases
Solution Approach 1:
The transmission priority is adjusted dynamically based on reception indicators rather than using fixed high-frequency transmission. This allows the system to achieve reliable message delivery by adapting transmission timing to actual channel conditions, reducing unnecessary retransmissions and latency
Solution Approach 2:
The patent changes the transmission parameter (priority level) based on reception indicators. By modifying the priority parameter dynamically, the system optimizes message delivery timing and reduces latency while maintaining reliability through adaptive rather than static transmission behavior
3Reliability
If V2X message transmission frequency is increased to ensure timely reception of critical information, then channel load increases leading to network saturation
Solution Approach 1:
The system uses feedback from recipient stations about message reception status to generate reception indicators. This feedback mechanism allows the network to self-regulate channel load by providing information about successful deliveries, enabling sender stations to reduce transmission frequency when channel conditions are good and maintain reliability without excessive load
Solution Approach 2:
The V2X communication system performs self-optimization through automatic priority adjustment based on reception indicators. The network stations autonomously adjust transmission behavior according to observed channel conditions, eliminating the need for external control while maintaining reliability and preventing network saturation
Data Source
AI summary
A method for V2X communication. The method includes transmitting, via at least one V2X radio channel, at least one first V2X message object; receiving, via the at least one V2X radio channel, at least one feedback associated with a reception status of the at least one first V2X message object; deciding, based on the at least one feedback, whether to transmit at least one second V2X message object; and transmitting, via the at least one V2X radio channel, the at least one second V2X message object, if the decision indicates that the at least one second V2X message object is to be transmitted.