Reservation Signal Forwarding for V2V Collision Avoidance
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Solution Overview
Problem
In vehicle-to-vehicle (V2V) communications, the high probability of data transmission collisions due to limited resources and mobility of vehicles leads to 'merging collisions,' where vehicles inadvertently use the same time-slots for data transmission, which existing sensing methods fail to prevent.
Innovation Solution
A wireless communication device forwards a reservation signal identifying time-slots reserved by another device, ensuring that if a higher-priority transmission is detected, it transmits a forwarded reservation signal to avoid collisions, incorporating GPS information and geographical distance considerations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If vehicles autonomously select time-frequency resources for data transmissions, then communication flexibility and autonomy are improved, but the probability of data transmission collisions increases
Solution Approach 1:
The patent applies preliminary action by transmitting reservation signals before actual data transmissions to reserve time-frequency resources. Vehicles send reservation signals in advance to indicate their intended transmission resources, allowing other vehicles to detect and avoid these reserved resources, thereby preventing collisions before they occur.
Solution Approach 2:
The patent uses reservation signals as an intermediary mechanism to coordinate resource allocation between vehicles. Instead of direct conflict over resources, vehicles communicate their resource intentions through reservation signals, which act as intermediaries to enable conflict-free resource selection by other vehicles.
2Quantity of substance
If the number of transmitting V2V devices increases, then network capacity and coverage are improved, but the probability of data transmission collisions increases
Solution Approach 1:
The patent implements feedback by having vehicles continuously monitor and detect reservation signals from other vehicles. This feedback mechanism allows vehicles to adjust their resource selection based on the reserved resources detected in the environment, enabling scalable operation as more vehicles join the network while maintaining collision avoidance.
3Productivity
If vehicles use the same time-slots for data transmission, then resource utilization is improved, but merging collisions occur
Solution Approach 1:
The patent applies preliminary anti-action by detecting reserved time-slots through reservation signals and actively avoiding these slots when selecting transmission resources. This preemptive avoidance mechanism prevents merging collisions by ensuring vehicles do not select time-slots already reserved by other vehicles, thereby maintaining both high resource utilization and collision-free transmissions.
Data Source
AI summary
The methods and systems discussed herein describe a first wireless communication device forwarding a first reservation signal, which identifies one or more time-slots that have been reserved by a second wireless communication device, to avoid “merging collisions.” In some examples, the first wireless communication device also receives a second reservation signal from a third wireless communication device, which identifies at least one time-slot that is the same as a time-slot that was identified in the first reservation signal. The first wireless communication device transmits a forwarded reservation signal that identifies the time-slots reserved by whichever of the second wireless communication device and the third wireless communication device has higher priority data to transmit. In other examples, the first wireless communication device transmits the forwarded reservation signal if a received power value of the first reservation signal is within a pre-defined received power range.