Base Station Antenna Rotation for LOS-MIMO Alignment
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Solution Overview
Problem
The reduction in channel capacity between a base station antenna and a mobile station antenna due to the movement of the mobile station in LOS-MIMO transmission is not effectively addressed by existing technologies, leading to suboptimal communication performance.
Innovation Solution
A base station with a pair of antennas symmetrically disposed about a symmetry axis, equipped with an antenna rotation mechanism that adjusts the direction of the antennas based on the mobile station's movement direction, ensuring alignment with the mobile station's antennas to maintain optimal channel capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the base station uses fixed antenna orientation in LOS-MIMO transmission, then the device complexity is reduced, but the channel capacity decreases due to mobile station movement
Solution Approach 1:
The patent applies the Dynamics principle by transitioning from fixed antenna orientation to dynamic antenna orientation. The base station antenna direction is continuously adjusted based on the mobile station's movement direction, allowing the system to adapt to changing channel conditions and maintain optimal channel capacity despite mobile station movement.
Solution Approach 2:
The patent implements Feedback by using the mobile station's movement direction information to control the base station antenna orientation. The system receives feedback about the mobile station's position and movement, then adjusts the antenna direction accordingly to maintain alignment with the mobile station, ensuring stable channel capacity.
2Reliability
If the base station antenna direction is adjusted to track mobile station movement, then the channel capacity is maintained, but the device complexity increases due to rotation mechanism
Solution Approach 1:
The patent applies Mechanics substitution by replacing complex mechanical rotation mechanisms with electronic phase shifting networks. Instead of physically rotating antennas, the system uses electronic means to adjust the phase and direction of transmitted signals, achieving the same effect with reduced mechanical complexity.
Solution Approach 2:
The patent implements Parameter changes by adjusting the phase and amplitude parameters of the signals transmitted from multiple base station antennas. By changing these signal parameters dynamically, the system achieves directional beam steering and maintains channel capacity without requiring physical antenna movement.
3Productivity
If symmetric antenna configuration is used at base station and mobile station, then the LOS-MIMO transmission efficiency is improved, but the adaptability to arbitrary movement directions is reduced
Solution Approach 1:
The patent applies Asymmetry by breaking the symmetric antenna configuration constraint. While the base station and mobile station each have symmetric antenna pairs, the system introduces asymmetric orientation by aligning the base station antenna pair perpendicular to the mobile station's movement direction, rather than maintaining parallel alignment. This asymmetric arrangement provides better adaptability to arbitrary movement directions.
Solution Approach 2:
The patent implements Dynamics by making the antenna orientation relationship dynamic rather than fixed. The base station antenna orientation is continuously adjusted based on the mobile station's current movement direction, allowing the system to adapt to changing movement directions while maintaining transmission efficiency.
Data Source
AI summary
Based on information indicating a direction of movement of a mobile station, a base station rotates a direction of a set of a first antenna and a second antenna disposed on the base station with respect to a direction of a set of a third antenna and a fourth antenna disposed on the mobile station, the third antenna and fourth antenna being symmetric with respect to a direction of movement of the mobile station.