QoS-Based Wireless Parallel Redundant Protocol for High-Speed Rail
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Solution Overview
Problem
High-speed vehicles, such as trains, face challenges in maintaining reliable wireless local area network connectivity due to roaming latency and packet loss when traveling at high speeds, necessitating a solution that ensures minimal latency and packet loss in wireless network communications.
Innovation Solution
Implementing a Quality-of-Service (QoS)-based Parallel Redundant Protocol (PRP) system with at least two wireless bridge devices on the vehicle, where packets are duplicated and transmitted through different wireless links based on priority, ensuring high-priority packets are sent redundantly and low-priority packets are sent through a single link with better quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If packet duplication is implemented for all packets to ensure reliability, then packet loss is reduced, but transmission efficiency deteriorates due to increased bandwidth consumption
Solution Approach 1:
The patent applies local quality by differentiating packet handling based on priority levels. High-priority packets receive duplication treatment for reliability, while low-priority packets use single transmission for efficiency. This selective approach optimizes resource allocation by applying redundancy only where critical, resolving the contradiction between reliability and transmission efficiency.
2Reliability
If multiple wireless links are used for packet transmission to reduce packet loss, then reliability is improved, but device complexity increases due to managing multiple links
Solution Approach 1:
The system manages complexity by applying different transmission strategies to different packet types. Only high-priority packets traverse multiple wireless links with full redundancy management, while low-priority packets use a single link. This localized approach to quality ensures reliability where needed without systematically increasing complexity across all traffic.
Solution Approach 2:
The patent segments traffic into high-priority and low-priority categories, allowing different transmission paths and redundancy levels for each segment. This segmentation simplifies the overall system management by creating distinct handling procedures for different traffic types, reducing the complexity burden of managing multiple links.
3Reliability
If packet duplication is performed for all packets, then packet loss is minimized, but bandwidth consumption increases
Solution Approach 1:
The patent implements local quality by applying packet duplication selectively based on priority markings. High-priority packets are duplicated across multiple links to ensure delivery, consuming more bandwidth only for critical traffic. Low-priority packets are transmitted singly, conserving bandwidth. This resolves the contradiction by optimizing the trade-off between reliability and bandwidth consumption on a per-packet basis.
Data Source
AI summary
A method includes receiving, at a first wireless bridge device, a first packet and determining whether the first packet is a first type or a second type. If the first packet is the first type, the first packet is duplicated to generate two duplicated packets. A first one of the duplicated packets is forwarded to a second wireless bridge device via a tunnel between the first wireless bridge device and the second wireless bridge device. A second one of the duplicated packets is forwarded to one or more access points via a first wireless link between the first wireless bridge device and the one or more access points. If the first packet is the second type, the first packet is forwarded to the second wireless bridge device via the tunnel or forwarding the first packet to the one or more access points via the first wireless link.