Directional Antenna Control Using Scale-Model Propagation Data
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Solution Overview
Problem
Conventional wireless communication systems face challenges in efficiently setting antenna directivity due to increased measurement time and outdated information when terminals or base stations move or change orientation, leading to ineffective antenna directivity.
Innovation Solution
A base station equipped with a database, acquisition, collection, and control units that utilize data from a scale model to efficiently set antenna directivity by collecting terminal states and radio wave arrival directions, allowing for dynamic control of directional antennas based on real-time data and stored information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reception power is measured for each direction of directivity of each antenna by using a training signal, then antenna directivity can be set, but the time related to the measurement of the reception power increases
Solution Approach 1:
The patent pre-measures and stores reception power data for each direction of directivity in a database before actual communication operations. This preliminary action eliminates the need for time-consuming measurements during runtime, resolving the contradiction between measurement precision and time loss.
Solution Approach 2:
The patent creates a database that copies and stores reception power measurement results for various directions and terminal states. By using these pre-copied data instead of performing new measurements, the system achieves accurate antenna directivity setting without the time penalty of repeated measurements.
2Measurement precision
If reception power is measured in advance, then antenna directivity can be set, but the information of the measured reception power becomes old when the terminal or base station moves or changes orientation
Solution Approach 1:
The patent dynamically selects appropriate reception power data from the database based on the current terminal state (position, orientation) obtained through collection units. This dynamic adaptation ensures that the most relevant pre-measured data is used, maintaining information validity even as conditions change.
Solution Approach 2:
The system continuously collects terminal state information (position, orientation) and uses this feedback to select the most appropriate pre-measured reception power data from the database. This feedback mechanism ensures that outdated information is replaced with more relevant data, maintaining accuracy without requiring continuous re-measurement.
3Area of stationary object
If the directivity pattern of the antenna increases, then coverage area expands, but the time related to the measurement of the reception power increases
Solution Approach 1:
The patent performs comprehensive reception power measurements for all directions during a preliminary phase and stores them in a database. This allows the system to handle expanded coverage areas without increasing measurement time during actual operations, as all necessary data is pre-collected.
Solution Approach 2:
By copying and storing reception power data for multiple directions in the database, the system can support expanded antenna coverage patterns without requiring additional measurement time. The pre-copied data covers all necessary directions for the expanded coverage area.
Data Source
AI summary
A base station according to an embodiment is a base station that performs wireless communication with a terminal using a directional antenna within a predetermined area, the base station including: acquisition circuitry configured to acquire data from a database that holds data indicating an antenna directivity suitable for each state of a terminal or each arrival direction of a radio wave from the terminal measured in a scale model in which a structure within a predetermined area is reduced at a predetermined scale factor; collection circuitry configured to collect a state of a terminal or an arrival direction of a radio wave from the terminal in practice within a predetermined area; and controller configured to control directivity of the directional antenna with respect to the terminal in practice within a predetermined area based on the state of the terminal or the arrival direction and data.