Network Device Visibility State Determination Using Beam Power Ratios
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Solution Overview
Problem
In mobile relay communication systems, determining the visibility state between a relay station and a terminal device is challenging due to variations in received power caused by shadowing and other factors, leading to low accuracy and inappropriate movement destinations for the relay station, which affects communication quality.
Innovation Solution
A communication device that measures received power using multiple-direction beams and calculates a ratio of central-direction beam power to total beam power to determine the visibility state, distinguishing between Line of Sight (LOS) and Non-Line of Sight (NLOS) environments, thereby improving prediction accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional single-beam received power measurement is used, then the measurement process is simple, but the visibility state determination accuracy is low due to shadowing and propagation variations
Solution Approach 1:
The patent divides the received signal measurement into multiple directional beam segments. Instead of measuring a single beam, the system measures multiple beams in different directions (e.g., forward, backward, left, right) and processes them separately. This segmentation allows the system to distinguish between direct line-of-sight signals and reflected signals affected by shadowing, thereby improving visibility state determination accuracy without requiring an overly complex measurement system.
Solution Approach 2:
The patent introduces a spatial dimension to the measurement process by measuring signals in multiple directions rather than a single direction. This multi-directional approach adds angular information to the measurement, enabling the system to differentiate between direct propagation paths and reflected paths. The system calculates the ratio of forward-direction beam power to total beam power, using this dimensional expansion to improve determination accuracy while maintaining practical system complexity.
2Measurement precision
If multiple-direction beam measurement is implemented, then visibility state determination accuracy is improved, but the measurement and processing time increases
Solution Approach 1:
The patent applies partial action by measuring a limited set of directional beams (e.g., forward, backward, left, right) rather than all possible directions. This selective measurement approach provides sufficient information for accurate visibility state determination without the time cost of comprehensive multi-directional measurement. The system processes only the necessary beam components to achieve the determination goal, balancing accuracy requirements with time efficiency.
3Reliability
If relay station movement destination is determined based on traditional methods, then the system is simple to operate, but communication quality deteriorates due to inappropriate positioning in shadowing areas
Solution Approach 1:
The patent implements feedback by continuously measuring the ratio of forward-direction beam power to total beam power and using this information to determine the visibility state. The system compares the measured ratio against threshold values to identify LOS/NLOS conditions and adjusts relay station positioning accordingly. This feedback mechanism enables automatic adaptation to changing propagation conditions, improving communication reliability while maintaining ease of operation through automated decision-making.
Data Source
AI summary
A first communication device includes, a measurer that receives signals transmitted from a second communication device by using beams in different directions in the first communication device as a plurality of signals, and measures received power for each of the received beams, and a determinator that calculates a ratio of received power of a central-direction beam including a direction from the first communication device to the second communication device to a total of received power of the plurality of the beams, and determines a visibility state between the first communication device and the second communication device in accordance with the ratio.