Mobile Relay Node Handoff for High-Speed Vehicles
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Solution Overview
Problem
Current wireless communication systems face challenges in providing continuous service to mobile users, especially in high-speed environments like trains, due to limitations in existing relay nodes that are designed for stationary use, leading to issues with high traffic load, frequent handoffs, and signal degradation.
Innovation Solution
A mobile relay node system is introduced, which is installed on moving vehicles and can establish communication links with multiple base stations, allowing for seamless handoffs between them, reducing the need for frequent handoffs with external base stations and maintaining continuous service.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If stationary relay nodes are used in high-speed mobile environments, then network architecture simplicity is maintained, but service continuity and signal quality deteriorate due to frequent handoffs and high Doppler shift
Solution Approach 1:
The patent transforms the relay node from a stationary to a mobile configuration, allowing it to move with the vehicle. This dynamic adaptation enables the relay node to maintain stable communication links with both the donor base station and user equipment throughout the vehicle's movement, eliminating service interruptions caused by handoffs in high-speed environments
Solution Approach 2:
The mobile relay node acts as an intermediary between the donor base station and user equipment inside the vehicle. By positioning this intermediary within the moving vehicle, the system creates a stable local access point that mediates communication without requiring frequent handoffs, thus maintaining service continuity while preserving overall network architecture simplicity
2Reliability
If mobile relay nodes are deployed on vehicles, then service continuity improves, but device complexity and system cost increase
Solution Approach 1:
The mobile relay node is designed to perform multiple functions: it serves as a donor base station for user equipment, maintains connectivity with external networks, and adapts to the vehicle's movement. This multi-functionality justifies the increased device complexity by consolidating multiple communication roles into a single mobile unit deployed on the vehicle
Solution Approach 2:
The mobile relay node is pre-deployed on the vehicle before movement begins, establishing stable communication links in advance. This preliminary positioning allows the system to maintain service continuity without requiring complex real-time handoff mechanisms, thereby managing device complexity while ensuring reliable service
3Area of stationary object
If frequent handoffs are performed with external base stations, then coverage area is maintained, but latency increases and signal quality deteriorates
Solution Approach 1:
The patent segments the coverage area into local zones served by mobile relay nodes on different vehicles, rather than relying on a single large coverage area from external base stations. This segmentation reduces the need for frequent handoffs between external base stations, thereby reducing latency and maintaining signal quality while still providing broad overall coverage through multiple distributed relay nodes
Data Source
AI summary
A mobile relay node having communication sessions with a plurality of wireless mobile device (UEs) and a communication link to a source base station via a first communication link is located within a moving vehicle. As the vehicle moves from the coverage area of the source base station to the coverage area of a target base station, the relay node performs a hand off process that initiates a second communication link with the target while maintaining and continuing to relay communications between the UEs and the source. Once the second communication link is active, the relay node switches UE traffic from the source base station to the target base station over the second communication link, and then releases the first communication link.