IoV Traffic Sign Broadcast with VIFS Conflict Detection
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Solution Overview
Problem
Existing Internet of Vehicles (IoV) electronic traffic sign information broadcast methods using CSMA/CA and EDCA suffer from long transmission delays and low channel utilization, especially in dynamic environments, failing to provide real-time and efficient information distribution.
Innovation Solution
A method for IoV traffic sign information broadcast with a Quality of Service (QoS) guaranteed mechanism based on conflict detection, utilizing a distributed algorithm and Variable Inter Frame Space (VIFS) calculation for prioritized message transmission, allowing self-organization and efficient information dissemination with reduced delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CSMA/CA and EDCA are used for traffic sign information broadcast, then QoS assurance is achieved, but transmission delay increases and channel utilization decreases
Solution Approach 1:
The patent applies preliminary action by pre-calculating Variable Inter Frame Space (VIFS) values for different message priorities before transmission. The road-side unit organizes traffic sign messages with assigned priorities and pre-determines their VIFS values, allowing high-priority messages to be transmitted immediately when the channel becomes available, thus reducing transmission delay while maintaining QoS differentiation.
Solution Approach 2:
The patent implements dynamics by introducing a dynamic VIFS mechanism that adjusts inter-frame spacing based on message priority and channel conditions. Unlike fixed CSMA/CA backoff, the VIFS can be dynamically modified according to the urgency of traffic sign information, enabling the system to adapt transmission timing to real-time requirements and reduce delays for critical messages.
2Reliability
If CSMA/CA and EDCA are used for traffic sign information broadcast, then QoS assurance is achieved, but channel utilization decreases
Solution Approach 1:
The road-side unit performs preliminary organization of traffic sign messages with assigned priorities and pre-calculated VIFS values before attempting transmission. This preparation allows the unit to immediately transmit high-priority messages when the channel is available, reducing idle time and improving channel utilization while maintaining QoS differentiation.
Solution Approach 2:
The patent enables continuous useful action by allowing multiple prioritized messages to be queued and transmitted in sequence without full backoff between each message. The VIFS mechanism provides controlled spacing that maintains channel occupancy for legitimate traffic while preventing excessive collisions, thereby improving overall channel utilization compared to traditional CSMA/CA.
3Device complexity
If traditional broadcast methods are used, then information distribution is simple, but transmission delay increases and real-time requirements cannot be met
Solution Approach 1:
The system performs preliminary organization of traffic sign messages with assigned priorities and pre-calculated VIFS values before transmission. This preparation enables the road-side unit to immediately transmit high-priority messages when the channel becomes available, significantly reducing transmission delay while maintaining a relatively simple broadcast architecture.
Solution Approach 2:
The patent introduces dynamic VIFS adjustment based on message priority, allowing the system to adapt transmission timing to real-time requirements. High-priority traffic sign messages receive smaller VIFS values for faster transmission, while lower-priority messages use larger VIFS values, achieving real-time performance without complex scheduling protocols.
Data Source
AI summary
The present disclosure discloses a method for Internet of Vehicles (IoV) electronic traffic sign information broadcast with Quality of Service (QoS) guaranteed mechanism based on conflict detection. Compared with the traditional WLAN applied in electronic traffic sign information broadcast, the present disclosure significantly reduces the information broadcast delay, and at the same time provide QoS guaranteed service for the information broadcast. It allows IoV, through distributed algorithm, to achieve the electronic traffic sign information broadcast with self-organization framework, short transmission delay and high efficiency.