Beamforming Interference Mitigation via Dynamic Carrier Aggregation
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Solution Overview
Problem
In wireless networks, beamforming can cause interference between wireless devices due to overlapping signal lobes, particularly in orthogonal frequency-division multiple access systems like LTE, where frequency reuse is common, leading to degraded performance for devices in adjacent sectors.
Innovation Solution
A method and system that monitor variations in transmission angles of formed beams and switch the operating mode of affected devices from a default to an aggregated mode when interference thresholds are met, utilizing additional resources on a different carrier to mitigate interference, and revert back to default mode when interference ceases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming is used to provide better coverage to wireless devices in specific locations, then coverage quality is improved, but interference with other wireless devices increases
Solution Approach 1:
The patent dynamically adjusts the operating mode of wireless devices based on real-time interference conditions. When a device detects interference from beamforming signals, it switches from a default mode to an aggregated mode that combines multiple carriers, thereby adapting to changing environmental conditions and maintaining reliable communication despite the presence of interference
Solution Approach 2:
The patent changes the operating parameters of affected wireless devices by switching between different operating modes. The aggregated mode uses different parameter configurations (combining multiple carriers with different frequency offsets) to mitigate the harmful effects of beamforming interference while maintaining connectivity
2Productivity
If frequency reuse factor of 1 is used in LTE systems, then spectral efficiency is improved, but interference between adjacent sectors increases
Solution Approach 1:
The patent applies local quality by providing different operating modes to different wireless devices based on their specific interference conditions. Devices in adjacent sectors experiencing interference from beamforming are switched to aggregated mode with specific carrier combinations, while devices not affected by interference continue using the default mode, thereby locally optimizing performance without sacrificing overall spectral efficiency
Solution Approach 2:
The patent segments the frequency resources by dividing them into multiple carriers with different frequency offsets. When interference occurs in adjacent sectors using frequency reuse factor 1, affected devices can switch to aggregated mode that combines these segmented carriers, effectively separating the interference problem from the spectral efficiency goal by using different resource segments
Data Source
AI summary
Minimizing interference including obtaining interference measurements for transmission angles of an interference-causing side lobe of a formed beam directed towards a wireless device in a beamforming mode, and determining threshold angles wherein an operating mode of another wireless device subject to the interference is switched to from a default mode to a carrier aggregation mode utilizing a different frequency than the formed beam. Upon the transmission angle of the formed beam meeting a second threshold angle, the operating mode of the other wireless device is switched back to the default mode.