Relay Station Position Calculation for Fresnel Zone Correction
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Solution Overview
Problem
Existing technologies struggle to calculate the optimal installation position for relay stations, particularly for reconfigurable intelligent surface (RIS) reflecting plates, to maximize the line of sight (LOS) region and prevent a decrease in radio wave propagation efficiency.
Innovation Solution
An installation position calculation device and method that identifies the optimal position for a relay station by maximizing the LOS region, using a combination of identification units, candidate point extraction, correction based on Fresnel zones, and control to determine the installation positions of relay stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If relay station installation position is calculated using existing base station calculation methods, then base station positioning can be achieved, but relay station positioning cannot be accurately determined
Solution Approach 1:
The patent segments the relay station positioning problem into multiple calculation stages: first calculating initial candidate positions based on geometric relationships between transmission and reception stations, then filtering and selecting optimal positions based on LOS region maximization criteria. This segmentation enables accurate relay station positioning by breaking down the complex calculation into manageable steps that differ from conventional base station positioning methods.
2Reliability
If relay station is installed to maximize LOS region, then propagation efficiency is improved, but installation position calculation becomes complex
Solution Approach 1:
The patent applies preliminary action by first calculating geometric candidate positions based on transmission and reception station locations before optimizing for LOS region maximization. This preliminary calculation establishes a constrained search space, reducing the complexity of subsequent optimization while ensuring propagation efficiency is maximized within feasible installation locations.
Solution Approach 2:
The patent introduces a new dimension to the calculation by incorporating LOS region maximization as an additional optimization criterion beyond basic geometric positioning. This dimensional expansion transforms the positioning problem from simple coordinate calculation to a multi-objective optimization that simultaneously considers geometric constraints and propagation efficiency, achieved through iterative evaluation of candidate positions.
3Area of stationary object
If multiple relay stations are installed to cover larger area, then system coverage is improved, but interference between relay stations increases
Solution Approach 1:
The patent applies local quality by optimizing each relay station's installation position independently based on local geometric relationships between transmission and reception stations. Each relay station's position is calculated to maximize its specific LOS region without considering global interference patterns, thereby achieving local optimization that collectively improves coverage while minimizing interference through distributed independent optimization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively calculates the installation position of relay stations to prevent a decrease in radio wave propagation efficiency, ensuring optimal performance in wireless communication systems.
Implementation Method 1
wireless communication systems relaying radio waves transmitted from transmission stations to reception stations by reflecting the radio waves by reflecting plates
Implementation Method 2
a correction unit configured to correct a position of each of the next installed station candidate points extracted by the next candidate point extraction unit based on a Fresnel zone for the next relay station
Data Source
AI summary
An installation position calculation device of a relay station according to an embodiment includes: a first identification circuitry that identifies a position of an installed station candidate point at which an LOS region from the relay station is maximized; a next candidate point extraction circuitry that regards the position identified as a transmission point of a radio wave and extracts two or less top next installed station candidate point at which a next relay station maximizes the LOS region; a correction circuitry that corrects the position of each of the installed station candidate points extracted based on a Fresnel zone for the next relay station; and a second identification circuitry that identifies, as an installation position of the next relay station, a position of a next installed station candidate point at which a reflection angle of the radio wave toward the next installed station candidate point extracted is minimized.