Inter-Vehicle Wireless Communication Timing and Channel Separation
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Solution Overview
Problem
Inter-vehicle communication systems face instability due to unpredictable waiting times and communication delays caused by carrier sensing, especially when multiple devices on adjacent vehicles use the same or close frequency channels, leading to interference and decreased communication speed.
Innovation Solution
A wireless communication system where devices on mobile objects transmit packets using different channels, with the second device transmitting later than the first, to stabilize communication quality and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carrier sensing is performed to avoid interference between multiple communication devices, then communication reliability is improved, but communication delay becomes unstable and unpredictable
Solution Approach 1:
The system performs preliminary actions by pre-establishing time division patterns and channel allocation before communication occurs. Devices are assigned specific time slots and channels in advance, eliminating the need for runtime carrier sensing and waiting, thus resolving the contradiction between reliability and delay stability.
Solution Approach 2:
The system dynamically assigns time slots and channels based on communication patterns and interference conditions. By making the time-division and channel-assignment flexible rather than fixed, the system can adapt to changing conditions while maintaining predictable delay characteristics without requiring carrier sensing.
2Speed
If multiple communication devices on adjacent vehicles use the same or close frequency channels, then communication speed is improved, but interference occurs and communication quality becomes unstable
Solution Approach 1:
The system segments the communication resources by dividing time into distinct slots and assigning different frequency channels to different devices. This segmentation allows multiple devices to communicate simultaneously at high speed while preventing interference through temporal and spectral separation.
Solution Approach 2:
The system adds temporal and spectral dimensions to the communication resource allocation. By organizing communications in time slots and frequency channels rather than allowing simultaneous use of the same resources, the system enables high-speed communication for multiple devices while maintaining stability through structured resource division.
3Loss of time
If transmission power is sufficiently decreased to suppress carrier sensing delay, then communication delay due to carrier sensing is reduced, but communication delay due to external noise increases
Solution Approach 1:
The system extracts and eliminates the carrier sensing mechanism from the communication protocol by implementing time-division and channel-assignment based interference avoidance. This removes the source of carrier sensing delay entirely, and by maintaining adequate transmission power, it also avoids the problem of increased delay due to external noise.
Data Source
AI summary
Communication quality such as a delay time is stabilized when a plurality of communication devices on the same mobile object simultaneously perform communication. A wireless communication system that is mounted on a mobile object is a wireless communication system including a first communication device and a second communication device that are mounted on a first mobile object. When information is shared by mobile objects by transmitting packets based on information acquired from a network within the first mobile object to a communication device mounted on a second mobile object, the first communication device and the second communication device transmit packets having the same content by adopting the same communication method and using different channels, and a signal transmission timing from the second communication device is set to be later than a transmission timing from a communication device from the first communication device.