Vehicle Communication Node Time Synchronization via RSU
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Solution Overview
Problem
Independent domains in vehicle networks, lacking physical connection to universal time domains, cannot be synchronized with them, leading to potential malfunctions in time-aware networks.
Innovation Solution
A communication node in a vehicle receives time information from a road side unit (RSU), sets its time based on this information, and transmits it to other domains, allowing synchronization with universal time domains and enabling working clock domains to synchronize with the universal time domain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a working clock domain exists independently without physical connection to universal time domain, then device complexity is reduced and adaptability is improved, but time synchronization capability deteriorates
Solution Approach 1:
The patent introduces a vehicle as an intermediary carrier that receives time information from RSUs in universal time domains and transmits it to working clock domains. The vehicle acts as a mobile mediator bridging the gap between physically disconnected domains, enabling time synchronization without direct physical connection while maintaining domain independence.
Solution Approach 2:
The patent transitions from traditional spatial/physical connection-based time synchronization to a new dimension involving mobile communication and wireless information transfer. By using the vehicle's movement and communication capabilities across different spatial locations, time information is transferred from universal time domains to independent working clock domains without physical cable connections.
2Reliability
If time information is transmitted through vehicle network, then time synchronization is achieved, but communication overhead and network load increase
Solution Approach 1:
The patent utilizes existing time information packets from RSUs that are already being transmitted for other purposes. Instead of creating dedicated time synchronization traffic, the system copies or repurposes existing communication frames to carry time information, thereby achieving synchronization without additional communication overhead or network load.
Data Source
AI summary
A time synchronization method performed by a communication node in a vehicle includes: receiving, from a road side unit (RSU), a first frame including time information of a first domain to which the RSU belongs; setting a time of the vehicle based on a time indicated by the time information of the first domain; and transmitting a second frame including the time information of the vehicle.