Reconfigurable Antenna Pattern Selection for Downlink Interference
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Solution Overview
Problem
In indoor propagation environments, downlink performance of base stations is limited by interference between adjacent base stations using the same frequency band, especially when they have fixed radiation patterns or polarizations, which are optimal only at specific installation locations or channel conditions.
Innovation Solution
A method and apparatus using reconfigurable antennas to determine and adjust transmit antenna patterns based on Signal to Interference and Noise Power Ratios (SINRs) and Channel Quality Indicator (CQI) values, allowing base stations to optimize their patterns to minimize interference and maximize channel capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fixed radiation pattern or fixed polarization antennas are used, then installation and operation are simple, but downlink performance is limited by interference between adjacent base stations
Solution Approach 1:
The patent applies reconfigurable antennas that can dynamically change their radiation patterns and polarizations according to channel conditions and interference levels. The base station determines optimal antenna patterns based on CQI values from mobile stations and adjusts patterns to minimize interference while maintaining simple installation procedures.
2Object-affected harmful factors
If reconfigurable antennas with pattern changing are used, then downlink interference is reduced, but device complexity increases
Solution Approach 1:
The patent changes antenna parameters (radiation pattern, polarization) dynamically based on measured channel conditions. The base station receives CQI values from mobile stations, determines optimal patterns, and switches antenna configurations to reduce interference, making the complexity adaptive rather than static.
Solution Approach 2:
The system uses feedback from mobile stations in the form of CQI values to continuously monitor channel quality and interference levels. Based on this feedback, the base station adjusts antenna patterns to optimize performance and minimize interference, creating a closed-loop control system.
3Device complexity
If antenna patterns are fixed, then device complexity is low, but adaptability to different channel conditions is poor
Solution Approach 1:
The patent implements dynamic antenna pattern selection where the base station adapts its radiation patterns based on real-time channel conditions. The system remains relatively simple in structure but gains adaptability through dynamic reconfiguration based on CQI feedback from mobile stations.
Data Source
AI summary
A transmit antenna pattern is provided. A method for determining the transmit antenna pattern includes determining first Signal to Interference and Noise Power Ratios (SINRs) of a first mobile station and a second mobile station based on first Channel Quality Indicator (CQI) values received from a first base station and a second base station in the first operation when a transmit antenna pattern of the first base station is fixed and a transmit antenna pattern of the second base station is changed, determining second SINRs of the first mobile station and the second mobile station based on second CQI values received from the first base station and the second base station when the transmit antenna pattern of the first base station is changed and the transmit antenna pattern of the second base station is changed, and determining a transmit antenna pattern exhibiting the best performance based on the determined SINRs.