Proxy Node Segmentation for VANET Transmission Reliability
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Solution Overview
Problem
Conventional TCP and split-TCP protocols in vehicular ad hoc networks (VANETs) face challenges in adapting to rapid network topology changes, leading to increased end-to-end delays, channel capturing time, and packet loss rates due to their inability to dynamically adjust to mobile node positions and velocities.
Innovation Solution
A transmission control method that dynamically adjusts the number and position of proxy nodes in VANETs by broadcasting beacon messages with mobility information, allowing relay nodes to transform into proxy nodes based on coverage remaining duration and moving direction, thereby dividing the network connection into sub-connections to enhance transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional TCP protocol is used for V2V communication, then reliable transmission can be provided, but the protocol cannot adapt to rapid network topology changes causing increased end-to-end delays
Solution Approach 1:
The patent divides the long transmission channel into multiple sub-channels by introducing proxy nodes at intermediate positions. Each sub-channel connects adjacent proxy nodes or endpoints, reducing the hop count and transmission delay while maintaining reliable delivery through segmented acknowledgment mechanisms
Solution Approach 2:
Proxy nodes are introduced as intermediary entities between the source and destination nodes. These proxy nodes relay packets locally, reduce the end-to-end transmission path, and provide intermediate acknowledgment points that speed up the overall transmission process while ensuring reliability
2Adaptability or versatility
If conventional TCP protocol is used, then communication can be established, but channel capturing time increases due to long transmission channel and high packet loss rate
Solution Approach 1:
By segmenting the transmission path into shorter sub-channels through proxy nodes, the patent reduces the transmission distance and packet loss probability in each segment, thereby decreasing the channel capturing time required while maintaining communication adaptability
3Loss of time
If split-TCP protocol places proxy nodes at designated positions, then the transmission channel is divided into sub-connections, but the protocol still cannot adaptively adjust to rapid network changes
Solution Approach 1:
The patent implements dynamic proxy node selection where relay nodes can transform into proxy nodes based on real-time network conditions such as coverage remaining duration and mobility information. This dynamic adaptation allows the network to respond to rapid topology changes while maintaining the benefits of segmented transmission
4Reliability
If more proxy nodes are employed to divide connection into more sub-connections, then transmission reliability improves, but transmission speed decreases
Solution Approach 1:
The patent dynamically adjusts the number and positioning of proxy nodes based on network parameters such as coverage remaining duration and mobility information. This optimization ensures that the network achieves sufficient reliability through appropriate segmentation without excessive proxy nodes that would slow down transmission
Data Source
AI summary
A transmission control method for a vehicular ad hoc network system having a plurality of mobile nodes is provided. The mobile nodes include a source node, a destination node, and a plurality of relay nodes. The source node transmits a data packet to the destination node through the relay nodes. The method includes each mobile node capturing mobility information being periodically broadcasted from neighboring mobile nodes to correspondingly update the connection state table thereof, wherein the connection state table records the coverage remaining time between the mobile node and neighboring mobile nodes; when any of relay nodes determines that the coverage remaining time between the relay node and the subsequent mobile node is less than a predefined threshold, the relay node transforms into a proxy node, stores the data packet, and establishes a reliable sub-connection between the proxy node and a next proxy node or the destination node.