Emergency Message Broadcasting via Channel Switching in WAVE Networks
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Solution Overview
Problem
Existing methods for emergency-message broadcasting in vehicular communication systems, particularly during the Service Channel (SCH) interval, face inefficiencies in promptly transferring messages to nearest neighbor vehicles when vehicles access different channels, leading to delays in conveying emergency information.
Innovation Solution
A method that involves receiving beacon messages from peripheral vehicles, creating a list of channel information based on distance, and broadcasting emergency messages by switching channels according to this list during the SCH interval, ensuring priority delivery to nearest vehicles using IEEE 802.11p/WAVE communication standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If emergency message is stored in queue until CCH interval when generated during SCH interval, then channel switching complexity is reduced, but message transmission delay increases significantly
Solution Approach 1:
The transmitting vehicle performs preliminary actions by maintaining a list of peripheral vehicles sorted by distance during normal operation. When an emergency message needs to be transmitted during SCH interval, this pre-prepared list enables immediate channel switching to the target vehicle's channel without complex real-time decision making, thus reducing both delay and switching complexity
Solution Approach 2:
The patent introduces an intermediary mechanism - a distance-based vehicle list maintained through beacon message exchanges - that mediates between the emergency message generation and the actual channel switching operation. This intermediary structure provides a ready-made transmission path that eliminates the need for complex real-time channel selection
2Loss of time
If emergency message is transmitted immediately during SCH interval, then message transmission delay is reduced, but channel switching complexity increases
Solution Approach 1:
The complex task of determining which vehicle to contact is performed in advance during normal beacon message exchanges, where vehicles continuously update their distance-based lists. This preliminary action transforms a potentially complex real-time decision into a simple lookup operation during emergency transmission
Solution Approach 2:
Each vehicle independently maintains its own distance-based list of peripheral vehicles using information from beacon messages. This self-service approach eliminates the need for centralized coordination or complex inter-vehicle negotiation during emergency transmission, simplifying the channel switching process
3Loss of time
If conventional emergency message transfer methods are used, then average delay time is reduced, but priority delivery to nearest neighbor vehicle is not ensured
Solution Approach 1:
The patent applies local quality by differentiating message transmission based on the spatial relationship between vehicles. Instead of uniform treatment, the system identifies the nearest neighbor vehicle through distance calculation and prioritizes message delivery to that specific local target, ensuring both speed and reliability for critical emergency information
Data Source
AI summary
The present invention relates to a method for emergency message broadcasting of vehicular wherein transfers emergency message to peripheral vehicles in regards to vehicular communication network method of IEEE 802.11p/WAVE communication standard base. Emergency message broadcasting method according to the present invention features in promptly transferring emergency message to peripheral vehicles even when vehicles are in access to different channels in SCH (Service Channel) interval according to multiple channel operation wherein defined by IEEE 1609.4 of WAVE communication standard.