Intersection Trajectory Grouping for Traffic Flow
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Solution Overview
Problem
Current solutions for managing traffic intersections, such as CV2X technologies, are ineffective in efficiently coordinating the traversal of a large number of vehicles, leading to delays and inefficiencies due to high communication loads and the risk of trajectory deadlocks.
Innovation Solution
A hybrid control mechanism that groups vehicles into motion groups based on their motion characteristics, with a leader vehicle coordinating the traversal of each group through the intersection, using cellular vehicle-to-everything (CV2X) communication to transmit maneuver targets and reduce the computational burden on infrastructure components like Road-Side Units (RSUs).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current CV2X messaging solutions are used to manage traffic intersections, then communication between vehicles and infrastructure is established, but communication load increases and trajectory deadlocks occur
Solution Approach 1:
The patent segments vehicles into different motion groups (e.g., groups moving in different directions or lanes) and assigns a single trajectory message to each group. This segmentation reduces the total number of trajectory messages from one per vehicle to one per group, directly addressing the contradiction between reliable intersection management and excessive communication load.
Solution Approach 2:
Instead of having each vehicle independently determine and communicate its own trajectory (vehicle-centric approach), the patent inverts the approach by having the infrastructure determine group trajectories and communicate them to vehicles (infrastructure-centric approach). This inversion reduces communication overhead and prevents deadlocks by centralizing trajectory coordination.
2Productivity
If individual vehicle trajectories are managed independently, then each vehicle can optimize its own path, but communication complexity and processing load increase
Solution Approach 1:
The patent merges multiple individual vehicle trajectory plans into a single group trajectory message. By combining vehicles with similar motion characteristics into groups and assigning a common trajectory to each group, the system maintains productive vehicle traversal while reducing communication and processing complexity.
Solution Approach 2:
The group trajectory message serves multiple functions simultaneously: it provides navigation guidance for all vehicles in the group, coordinates intersection passage timing, and reduces communication overhead. This multi-functionality addresses the contradiction between maintaining traversal efficiency and reducing system complexity.
3Reliability
If more trajectory messages are transmitted for precise vehicle coordination, then intersection safety improves, but message overhead and processing burden increase
Solution Approach 1:
The patent applies partial action by transmitting trajectory information at the appropriate level of detail - not every vehicle needs its own unique trajectory message, but rather a representative trajectory for each motion group. This partial differentiation maintains sufficient coordination accuracy while reducing communication energy consumption.
Data Source
AI summary
Methods and systems for managing traversals of one or more vehicles through a traffic intersection are proposed. In one example, a method comprises: receiving a first message including one or more motion characteristics of one or more vehicles approaching the traffic intersection; forming a motion group; grouping a subset of the one or more vehicles into the motion group based on the one or more motion characteristics; assigning a leader vehicle for the motion group; determining a group maneuver target for the motion group to traverse through the traffic intersection; and transmitting, to the leader vehicle of the motion group, a second message including the group maneuver target for the motion group, to enable the leader vehicle of the motion group to control a motion of each member vehicle of the motion group based on the group maneuver target.