Base Station Beam Control for Distributed TDD Interference Mitigation
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Solution Overview
Problem
Existing communications systems face challenges in maintaining time-division-duplexing (TDD) synchronization and managing interference between different networks sharing mid-band spectrum without the need for a centralized spectrum access system, particularly when protecting incumbent operators and avoiding interference.
Innovation Solution
Base stations with beamforming capability independently manage interference by using wide control beams and narrower user beams, adjusting gain, reshaping or shutting off user beams, and making timing adjustments to synchronize with interfering networks, all without the need for a centralized controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a centralized spectrum access system is used to manage interference and maintain synchronization, then interference management effectiveness is improved, but system complexity and operational disruption increase
Solution Approach 1:
The patent divides the centralized spectrum access system into distributed base station entities, where each base station independently performs interference measurement and synchronization functions. This segmentation eliminates the need for a central controller while maintaining interference management capabilities through localized decision-making at each base station
Solution Approach 2:
Base stations autonomously measure interference on their own control and user beams, detect synchronization issues, and adjust their operations without external control. Each base station serves itself by independently managing its interference levels and maintaining TDD sync with neighboring base stations through self-monitoring and self-adjustment
2Reliability
If a centralized spectrum access system is implemented to protect incumbent operators, then incumbent protection is improved, but ease of operation deteriorates due to communication requirements
Solution Approach 1:
Non-incumbent base stations independently measure interference levels on their control and user beams, compare measurements against thresholds, and autonomously adjust operations to protect incumbent operators. This eliminates the need for continuous communication with a centralized system while maintaining protection capabilities
Solution Approach 2:
Base stations continuously monitor interference levels on control and user beams, use this feedback to detect when interference exceeds thresholds, and automatically adjust their transmissions. This closed-loop feedback mechanism enables autonomous incumbent protection without centralized coordination
3Reliability
If TDD synchronization is maintained across the entire band, then interference between networks is reduced, but adaptability to power disparities in sub-sections is lost
Solution Approach 1:
The patent applies different interference management approaches to different parts of the spectrum band based on local conditions. Base stations measure interference separately on control beams and user beams, and can apply different beamforming strategies to different spatial directions and frequency sub-bands, allowing adaptation to local power disparities while maintaining overall TDD sync
Solution Approach 2:
Base stations dynamically adjust their beamforming and transmission parameters based on real-time interference measurements. When power disparities or interference conditions change in specific sub-sections of the band, base stations can adapt their local operations while maintaining synchronization with the overall TDD structure
4Object-generated harmful factors
If beam gain is reduced to decrease interference range, then interference to other devices is reduced, but signal strength to user devices decreases
Solution Approach 1:
The patent applies beamforming to create directionally selective transmission. By shaping beams to target specific user devices spatially, the system can concentrate signal power in desired directions while minimizing interference in other directions. This allows maintaining adequate signal strength to users while reducing overall interference through spatial filtering
Solution Approach 2:
Beamforming creates focused, curved beam patterns rather than omnidirectional radiation. This curvature concentrates electromagnetic energy along specific spatial paths to user devices, improving signal strength in target directions while naturally limiting interference spread to other areas through the geometric confinement of the beam pattern
Data Source
AI summary
Methods and apparatus for managing and/or mitigating interference between networks without the need for a centralized controller are described. Beams are used by a base station in various embodiments. The range of one or more beams on which excessive interference is detected is decreased. If beam range reduction reduces the detected interference on a beam to an acceptable level the base station will resume operation on the beam at the reduced range. On beams on which gain reduction is insufficient to bring the detected interference to an acceptable level and still provide a usable beam, the beam may be shut off and/or beam reshaping may be tried. When other steps to mitigate interference are insufficient, a base station attempts one or more timing adjustments to see if a timing change and/or adjustment of the TDD configuration results in reduced interference, e.g., by improving timing synchronization with an interfering signal source.