Mobile Relay Station Moving Network Group Formation
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Solution Overview
Problem
In mobile multi-hop relay systems, there is a need for an efficient method to determine and manage moving network groups formed by mobile stations using mobile relay stations, particularly on transportation means, to ensure seamless service provision.
Innovation Solution
The method involves using travel information and signal strength analysis to determine whether a mobile station should be included in a moving network group, with specific criteria based on signal quality and stability, distinguishing between non-transparent and transparent mobile relay stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If distance-based methods are used to form moving network groups, then the formation process is simple, but the reliability is poor in urban environments due to fading effects
Solution Approach 1:
The patent changes the parameter basis for group formation from distance to signal strength. Instead of using distance thresholds, the system uses signal strength thresholds (e.g., RSRP, RSRQ values) to determine whether MSs form a moving network group, thereby improving reliability in fading-prone urban environments while maintaining implementation simplicity
Solution Approach 2:
The patent replaces the mechanical distance measurement approach with signal field-based measurement. By substituting physical distance metrics with electromagnetic signal strength metrics, the system becomes more adaptable to real-world propagation conditions including fading effects, thus improving reliability without significantly increasing complexity
2Measurement precision
If travel information is used to determine moving network groups, then the accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent makes the MRS perform multiple functions: it not only provides relay services but also determines moving network group formation by analyzing travel information and signal strength. This multi-functionality approach avoids adding separate determination devices, thus improving accuracy while minimizing the increase in device complexity
Solution Approach 2:
The MRS uses its own travel information (obtained from GPS or other positioning systems already installed for navigation purposes) combined with signal strength measurements to autonomously determine moving network group formation. This self-service approach leverages existing resources, improving accuracy without proportionally increasing system complexity
3Reliability
If signal strength analysis is used instead of distance-based methods, then the reliability is improved in fading environments, but the measurement precision requirements increase
Solution Approach 1:
The system implements feedback mechanisms where the MRS continuously monitors signal strength (RSRP, RSRQ) from MSs and adjusts group formation decisions based on these measurements. The feedback loop allows the system to adapt to changing channel conditions, improving reliability while using practical measurement precision levels available in mobile communication systems
Solution Approach 2:
The patent introduces dynamic threshold adjustment for signal strength measurements. Instead of using fixed thresholds, the system dynamically adapts thresholds based on current channel conditions, transportation means velocity, and location information, thereby improving reliability in fading environments while accommodating the practical precision limits of signal measurements
Data Source
AI summary
A method for forming a moving network group by a mobile relay station (MRS) in a mobile multi-hop relay (MMR) system is provided. The MRS determines whether a transportation means mounted with the mobile relay station is at a predetermined location derived from travel information. When a velocity information of the transportation means at the predetermined location is zero (0), the MRS determines whether to include a mobile station (MS) to the moving network group based at least partly upon a signal that the mobile station receives from the mobile relay station.