V2X Radio Terminal Synchronization Without Infrastructure
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Solution Overview
Problem
In Vehicle to X (V2X) radio communication systems, the lack of radio control devices at all intersections leads to asynchronous data transmission between vehicles, making it difficult for radio terminal devices to synchronize data transmission timing, which is crucial for effective communication and safety.
Innovation Solution
A semiconductor device and communication method that enable radio terminal devices to determine their operation mode based on the presence of a radio control device, switching to control mode when not available, allowing them to share a relative time for synchronized data transmission even without a radio control device at intersections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radio control devices are installed at all intersections, then synchronized data transmission can be achieved, but the device complexity and infrastructure cost increase significantly
Solution Approach 1:
The patent enables radio terminal devices to autonomously determine their own transmission timing by using their local timers and processing received frames with timing information from other vehicles. Each device independently calculates its transmission timing based on relative time relationships, eliminating the need for centralized radio control devices at every intersection.
Solution Approach 2:
The patent introduces timing information carried in communication frames as an intermediary mechanism. This timing information acts as a reference that allows vehicles to synchronize their transmissions without requiring direct control from radio control devices. The timing information serves as a mediator that coordinates transmission timing between distributed terminal devices.
2Ease of operation
If radio terminal devices use independent timers for data transmission, then device autonomy is maintained, but transmission timing synchronization is lost
Solution Approach 1:
The patent implements a feedback mechanism where each radio terminal device receives communication frames containing timing information from other vehicles, processes this information to determine relative time relationships, and adjusts its own transmission timing accordingly. This feedback loop maintains device autonomy while achieving synchronization through continuous timing adjustments based on received information.
Data Source
AI summary
A semiconductor device includes a transmission control unit which performs transmission processing, an area determination unit which determines whether an own vehicle is located in an intersection area, and an operation mode determination unit which determines either a control mode or a terminal mode as an operation mode of a radio terminal device based on an identification information for identifying a source of a received communication frame, and a determination result by the area determination unit. When the operation mode is determined to be the control mode, the transmission control unit outputs, as transmission data, a communication frame including generated control information. When the operation mode is determined to be the terminal mode, the transmission control unit outputs transmission data in synchronization with the received communication frame.