Base Station Antenna Quantity Control for Adjacent Frequency Interference
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Solution Overview
Problem
The increasing use of MIMO technology in cellular wireless systems, particularly massive-MIMO antenna arrays, leads to increased interference with adjacent frequency bands due to higher energy output, posing a challenge in densely populated areas with limited licensed spectrum.
Innovation Solution
A method where a cellular base station detects a trigger for reducing interference by dynamically reducing the number of antennas enabled for transmission on a given carrier, using RF filters to exclude certain antennas from the transmission passband, thereby lowering the overall energy output and minimizing interference with adjacent frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MIMO technology with multiple antennas is used to increase data rate and service capacity, then productivity and data rate are improved, but interference with adjacent frequency bands increases due to higher energy output
Solution Approach 1:
The system dynamically adjusts the number of active transmit antennas based on real-time interference conditions. When interference on adjacent frequencies is detected above a threshold, the base station reduces the number of active antennas from the full MIMO configuration to a subset, thereby reducing energy output and interference while maintaining service when conditions permit
Solution Approach 2:
The invention changes the operational parameter of antenna quantity from a fixed MIMO configuration to a variable parameter. The base station monitors adjacent frequency interference levels and adjusts the number of active transmit antennas accordingly, transitioning between different antenna configurations to balance data rate and interference
2Object-generated harmful factors
If the number of transmit antennas is reduced to lower energy output and interference, then harmful factors are reduced, but data rate and service capacity decrease
Solution Approach 1:
The system dynamically switches between full MIMO antenna configuration and reduced antenna configuration based on real-time interference measurements. When adjacent frequency interference is below the threshold, all antennas operate at full capacity for maximum data rate. When interference exceeds the threshold, the system transitions to a reduced antenna subset to minimize harmful emissions
Solution Approach 2:
The base station periodically monitors interference levels on adjacent frequency bands and adjusts antenna configuration in response to these periodic measurements. This creates a dynamic cycle of monitoring and adjusting between full and reduced antenna operation to adapt to changing spectral conditions
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
This approach effectively reduces interference on adjacent frequencies by lowering the energy output of the base station's transmission, while still maintaining service quality by using a reduced number of antennas, thus addressing the interference issues in densely populated areas with limited spectrum.
Implementation Method 1
using RF filters to exclude certain antennas from the transmission passband
Data Source
AI summary
A mechanism to control transmission by a base station, which may help to control interference on an adjacent frequency. The base station is configured to operate on a first frequency and is equipped with a number of antennas enabled for transmission on the first frequency. Upon detecting of a trigger for reducing potential interference on the adjacent frequency, the base station reduces the number of its antennas that are enabled for transmission on the first carrier, which may reduce the overall energy of the base station's transmission and may thereby reduce interference on the adjacent frequency. In an example implementation, the base station could disable a proper subset of its antennas from use for transmission on the first frequency, while leaving a remainder of its antennas enabled for transmission on the first frequency.